Chrysler Cirrus, Dodge Stratus, Plymouth Breeze Haynes. Instruction - page 21

5-8

Chapter 5 Engine electrical systems

11.8a Alternator mounting details

- 2.0L four-cylinder engine

11.8b Alternator

mounting details - 2.4L

four-cylinder engine

11.6 Alternator electrical connections -

four-cylinder engines

resistance should be 9,000 to 11,000 ohms. If
the resistance is out of tolerance, replace the
sensor.
3

Using a voltmeter, check the battery

voltage with the engine off. It should be
approximately 12 volts.
4

Start the engine and check the battery

voltage again. If the system is operating
properly, the voltage should increase to a
value between 13 to 15 volts.
5

If the indicated voltage reading is less or

more than the specified charging voltage,
have the PCM diagnosed at a dealer service
department or other qualified repair shop.
The voltage regulator on these models is
contained within the PCM and it cannot be
removed or serviced in any way.
6

Due to the special equipment necessary

to test the PCM and alternator, it is recom-
mended that if a fault is suspected, the vehi-
cle be taken to a dealer service department
or other qualified repair shop with the proper
equipment. Because of this, the home
mechanic should limit maintenance to check-
ing connections and the inspection and
replacement of the alternator itself. As a gen-
eral rule, when the battery is in good condi-
tion and all electrical connections are clean
and tight, if the charging voltage is low, the
alternator is faulty. If the charging voltage is
high, the voltage regulator is the problem.

11

Alternator - removal and
installation

General information

1

If you are replacing the alternator, take

the old one with you when purchasing a

replacement unit. Make sure the new/rebuilt
unit looks identical to the old alternator. Look
at the terminals - they should be the same in
number, size and location as the terminals on

the old alternator. Finally, look at the identifi-

cation numbers - they will be stamped into

the housing or printed on a tag attached to
the housing. Make sure the numbers are the

same on both the old and new alternators.
2

Many new/rebuilt alternators do not

have a pulley installed, so you may have to
switch the pulley from the old unit to the
new/rebuilt one. When buying an alternator,
find out the shop's policy regarding pulleys;
some shops will perform this service free of
charge.

Four-cylinder engines

Removal

Refer to illustrations 11.6, 11.8a and 11.8b
3

Disconnect the negative battery cable

from the ground stud on the left shock tower
(see Section 1).
4

On 1995 to 1997 models with 2.4L

engines equipped with anti-lock brakes, dis-
connect the electrical connector and remove
the two lower plate mounting bolts securing
the Controller Anti-lock Brakes (CAB) and
withdraw it from the vehicle (see Chapter 9).
5

On 2.4L engines, remove the engine

coolant reservoir (see Chapter 3).
6

Disconnect the electrical connector and

B+ cable from the alternator (see illustra-
tion).
7

Loosen the drivebelt adjustment bolts

and nut, then detach the alternator drivebelt
(see Chapter 1).
8

Remove the pivot bolt and spacer (see

illustrations).
9

While supporting the alternator, remove

the T-bolt, adjustment nut and bolt, then sep-
arate the alternator from the bracket. Maneu-
ver it toward the passenger side of the vehi-
cle and remove it from the engine compart-
ment. Note: On 2.4L engines equipped with

air conditioning, slide the alternator under the
air conditioning lines.

Installation

10 Installation is the reverse of removal.
11

After the alternator is installed, adjust

the drivebelt tension (see Chapter 1).

12

Check the charging voltage to verify

proper operation of the alternator (see Sec-

tion 10).

V6 engine

Removal

Refer to illustrations 11.14, 11.16 and 11.18

13

Disconnect the negative battery cable

from the ground stud on the left shock tower
(see Section 1).

14

Disconnect the electrical connector and

B+ cable from the alternator (see illustra-

tion).

11.14 Alternator electrical connections

(arrows) - V6 engine

Chapter 5 Engine electrical systems

5-9

11.18 Alternator upper bracket mounting bolts (arrows) -

V6 engine

11.16 Alternator mounting bolts (arrows) - V6 engine

12.2 Typical starter system diagram

5

15

Remove the drivebelt from the alternator

(see Chapter 1).

16

Loosen the upper and lower mounting

bolts (see illustration).
17

Remove the lower mounting bolt and

spacer - be careful not to drop the spacer or

nut.
18

While supporting the alternator, remove

the two bolts securing the alternator upper

bracket to the cylinder head (see illustration)

and then remove the bracket and the alterna-
tor.

19

Remove the upper mounting bolt and

separate the bracket from the alternator.

Installation

20 Installation is the reverse of removal.
21

After the alternator is installed, adjust

the drivebelt tension (see Chapter 1).

22

Check the charging voltage to verify

proper operation of the alternator (see Sec-

tion 10).

12 Starting system - general

information and precautions

Refer to illustration 12.2
1

The starter motor assemblies used on

2.0L four-cylinder and V6 engines use a plan-
etary gear reduction system. The starter

motor assembly on 2.4L four-cylinder
engines uses an offset gear reduction sys-
tem. The starter motor/solenoid for all models
is not serviceable and is sold strictly as a
complete assembly.
2

The starting system consists of the bat-

tery, the starter motor, the starter solenoid,
the starter relay, clutch start switch (manual
transaxles), PARK/NEUTRAL switch (auto-
matic transaxles), ignition switch and the
wires that connect the components (see
illustration).
The solenoid is located on the
starter motor which is located on the side of
the engine mounted to the transaxle bell-
housing towards the front of the vehicle.
3

When the ignition key is turned to the

Start position, the starter solenoid is actuated
through the starter control circuit which
includes a starter relay located in the Power

Distribution Center. The starter solenoid then

connects the battery to the starter. The bat-
tery supplies the electrical energy to the
starter motor, which does the actual work of
cranking the engine.
4

Always observe the following precau-

tions when working on the starting system:

a) Excessive cranking of the starter motor

can overheat it and cause serious dam-
age. Never operate the starter motor for
more than 15 seconds at a time without
pausing for at least two minutes to allow
it to cool.

b) The starter is connected directly to the

battery and could arc or cause a fire if

mishandled, overloaded

or shorted out.

c) Always

detach

the negative battery

cable from the ground stud on the left

shock

tower before working on the start-

ing system.

13 Starter motor - in-vehicle check

Refer

to illustration 13.7

1

Make sure the battery is fully charged

and all cable/connections - at the battery,

starter solenoid terminals and remote termi-

nals - are clean and secure.

2

If the starter motor does not function at

all when the switch is operated, make sure
the shift lever is in Neutral or Park (automatic
transaxles) and check the operation of the

PARK/NEUTRAL switch (see Chapter 7B). On

vehicles equipped with manual transaxles,

check the operation of the clutch start switch
(see Chapter 8).
3

If the starter motor spins but the engine

is not cranking, the overrunning clutch in the
starter motor is slipping and the starter motor
must be replaced. Also, the ring gear on the
driveplate may be worn. Inspect it after
removing the starter.
4

If, when the switch is actuated, the

starter motor does not operate at all but the

5-10

Chapter 5 Engine electrical systems

13.7 The starter relay (arrow) is located in

the Power Distribution Center inside the

engine compartment

solenoid clicks, the problem lies with either
the battery, the main solenoid contacts or the
starter motor itself (or possibly the engine
may be seized).
5

If the solenoid plunger cannot be heard

when the switch is actuated, the battery may
be faulty, the fusible link may be burned (the
circuit is open), the starter relay may be faulty
or the solenoid itself is defective.
6

To check the solenoid, connect a

remote starter switch between the positive
remote battery terminal and the ignition
switch wire terminal (the small terminal) on

the solenoid. If the starter motor operates

when the remote switch is activated, the
solenoid is OK and the problem is elsewhere
in the circuit.
7

Locate the starter relay in the Power

Distribution Center (PDC) (see illustration).
Remove the relay and perform the identical

tests as for the Automatic Shutdown Relay
(ASD) and the fuel pump relay in Chapter 4,
Section 3. Replace the relay if it does not
function as described.
8

If the starter motor still does not oper-

ate, remove the starter/solenoid assembly for
replacement as a complete unit (see Sec-
tion 14).
9

If the starter motor cranks the engine at

an abnormally slow speed, first make sure
that the battery is fully charged and that all
electrical connections are clean and tight. If
the engine is partially seized, or has the

14.4 Starter motor electrical connections

and mounting details - four-cylinder engine

wrong viscosity oil in it, it will crank slowly.

10 If the engine starts, run the engine until

normal operating temperature is achieved,
then turn off the engine. Remove the fuel
pump relay to keep the engine from starting
(see Chapter 4 if necessary).
11

Connect a voltmeter positive lead to the

positive remote battery terminal and the neg-
ative lead to the negative remote battery ter-
minal.
12

Crank the engine and take the voltmeter

reading as soon as a steady figure is indi-
cated. Do not allow the starter motor to turn
for more than 15 seconds at a time. A reading
of 9 volts or more, with the starter motor turn-
ing at normal cranking speed, is normal. If the
reading is 9 volts or more but the cranking
speed is slow, the motor, solenoid contacts
or circuit connections are faulty. If the read-
ing is less than 9 volts and the cranking
speed is slow, the starter motor is probably
bad.

14 Starter motor - removal and

installation

Four-cylinder engines

Removal

Refer to illustration 14.4

1

Detach the negative battery cable from

the ground stud on the left shock tower (see

Section 1).

2

Remove the air cleaner assembly (see

Chapter 4).

3

On vehicles equipped with automatic

transaxles, remove the Transmission Control

Module (TCM) from its mounting and position
it out of the way (see Chapter 7B). Note: DO

NOT disconnect the electrical connector from
TCM.
4

Remove the starter motor upper mount-

ing bolt (see illustration).
5

Raise the front of the vehicle and sup-

port it securely on jackstands.
6

Clearly label, then disconnect the wires

from the terminals on the starter motor
solenoid.
7

While supporting the starter motor,

remove the lower mounting bolt and with-
draw the starter motor from the vehicle.

Installation

8

Installation is the reverse of removal.

Tighten the starter motor mounting bolts to
the torque listed in this Chapter's Specifica-
tions.

V6

engine

Removal

Refer to illustrations 14.12 and 14.13

9

Detach the negative battery cable from

the ground stud on the left shock tower (see

Section 1).
10

Raise the front of the vehicle and sup-

port it securely on jackstands.
11

Remove the oil filter (see Chapter 1 if

necessary).
12

Disconnect the wires from the terminals

on the starter motor solenoid (see illustra-
tion).

13

While supporting the starter motor,

remove the three bolts securing it to the
transaxle bellhousing (see illustration) and
remove the starter motor from the vehicle.

Installation

14 Installation is the reverse of removal.

Tighten the starter motor mounting bolts to
the torque listed in this Chapter's Specifica-
tions.

14.13 Starter motor mounting bolts

(arrows) as viewed from under the vehicle

- V6 engine

PUSH ON

SOLENOID

CONNECTOR

14.12 Starter motor electrical connections

and mounting details - V6 engine

Chapter 6

Emissions and engine control systems

Contents

Section

Catalytic converter system - description,

check and replacement....................................................................8

CHECK ENGINE light .............................................................................2
Evaporative emission control system (EVAP) - description,

check and component replacement.................................................7

Exhaust Gas Recirculation (EGR) system - description,

check and component replacement.................................................6

General information ................................................................................1

Idle Air Control (IAC) motor - check and replacement .... See Chapter 4

Section

Information sensors and output actuators - description,

check and replacement .................................................................... 3

On board diagnosis (OBD-II) system - description and

trouble code access......................................................................... 2

Positive crankcase ventilation (PCV) system - check

and replacement..........................................................See Chapter 1

Positive crankcase ventilation (PCV) system - general

description........................................................................................5

Powertrain Control Module (PCM) - check and replacement ................4

6

Specifications

Torque specifications

Camshaft sensor (four-cylinder engines)

Sensor bolts.......................................................................................
Target magnet bolt .............................................................................

Crankshaft sensor retaining bolt .............................................................
Engine Coolant Temperature sensor

2.0L four-cylinder engine ...................................................................
2.4L four-cylinder and V6 engines.....................................................

EGR tube bolts........................................................................................
EGR valve-to-cylinder head bolts ............................................................
Intake Air Temperature sensor

2.0L four-cylinder engine (1995 only) .................................................
2.4L four-cylinder and V6 engines .....................................................

Intake Air Temperature/Manifold Absolute Pressure

sensor (four-cylinder engines)

Plastic intake manifold .......................................................................

Aluminum intake manifold ..................................................................

Knock sensor..........................................................................................
Manifold Absolute Pressure sensor bolts (V6 engine).............................

Oxygen sensor........................................................................................

Ft-lbs (unless otherwise indicated)

105 in-lbs
40 in-lbs
105 in-lbs

60 in-lbs
20
95 in-lbs
200 in-lbs

60 in-lbs
100 in-lbs

20 in-lbs
30 in-lbs
90 in-lbs
30 in-lbs
20

6-2

Chapter 6 Emissions and engine control systems

1.5 The Vehicle

Emission Control

Information (VECI)

label is located in the

engine compartment

on the upper radiator
support and contains

information on engine

type, tune-up

specifications, type of

emissions control

devices used on your

vehicle and a vacuum

diagram

1

General information

Refer to illustration 1.5

1

To prevent pollution of the atmosphere

from incompletely burned and evaporating
fuel gases and to maintain good driveability

and fuel economy, a number of emission
control systems are incorporated. The major
systems incorporated on the vehicles with

which this manual is concerned include the:

Evaporative Emission Control (EVAP)

system

Exhaust Gas Recirculation (EGR) system

Oxygen sensor (02) system

Positive Crankcase Ventilation (PCV)

system

Powertrain Control Module (PCM)

(computer) and information sensors

Catalytic converter

2

The Sections in this Chapter include

general descriptions, checking procedures
within the scope of the home mechanic and
component replacement procedures (when
possible) for each of the systems listed
above.
3

Before assuming an emissions control

system is malfunctioning, check the fuel and
ignition systems carefully. The diagnosis of
some emission control devices requires spe-
cialized tools, equipment and training. If
checking and servicing become too difficult
or if a procedure is beyond your ability, con-
sult a dealer service department or other
qualified service facility. Remember, the most
frequent cause of emissions problems is sim-
ply a loose or broken vacuum hose or wire,
so always check the hose and electrical con-
nections that interconnect the components
within each system first.
4

This doesn't mean, however, that emis-

sion control systems are particularly difficult
to maintain and repair. You can quickly and
easily perform many checks and do most of
the regular maintenance at home with com-
mon tune-up and hand tools. Note: Because
of a Federally mandated extended warranty
which covers the emission control system
components, check with your dealer
about
warranty coverage before working on any
emissions-related
systems. Once the war -

ranty has expired, you may wish to perform
some of the component checks and/or
replacement
procedures in this Chapter to
save money.

5

Pay close attention to any special pre-

cautions outlined in this Chapter. A Vehicle
Emissions Control Information (VECI) label is
located in the engine compartment (see
illustration).
This label contains important
emissions specifications and adjustment
information. When servicing the engine or
emissions systems, check the VECI label for
information on your particular vehicle.

2

On Board Diagnosis (OBD-II)

system - description and trouble
code access

Diagnostic tool information

Refer to illustrations 2.1 and 2.2
1

A digital multi-meter is necessary for

checking fuel injection and emission related
components (see illustration). A digital volt-
ohmmeter is preferred over the older style

analog multi-meter for several reasons. The

analog multi-meter cannot display the volt,
ohms or amps measurement in hundredths
and thousandths increments. When working
with electronic circuits which are often very
low voltage, this accurate reading is most
important. Another good reason for the digital
multi-meter is the high impedance circuit.
The digital multi-meter is equipped with a
high resistance internal circuitry (10 million
ohms). Because a voltmeter is hooked up in
parallel with the circuit when testing, it is vital
that none of the voltage being measured
should be allowed to travel the parallel path
set up by the meter itself. This dilemma does
not show itself when measuring larger
amounts of voltage (9 to 12 volt circuits) but if
you are measuring a low voltage circuit such
as the oxygen sensor signal voltage, a frac-
tion of a volt may be a significant amount
when diagnosing a problem.
2

Hand-held scanners are the most pow-

erful and versatile tools for analyzing engine
management systems used on later model
vehicles (see illustration). Each brand scan

2.1 Digital multi-meters can be used for

testing all types of circuits; because of

their high impedance, they are much more

accurate than analog type meters for

measuring low voltage computer circuits

2.2 Scanners like the Actron ScanTool

and the AutoXray XP240 are powerful

diagnostic aids - programmed with

comprehensive diagnostic information,

they can tell you just about anything you

want to know about your electronic

engine management system

tool must be examined carefully to match the
year, make and model of the vehicle you are
working on. Often interchangeable cartridges
are available to access the particular manu-
facturer (Chrysler, Ford, GM, etc.). Some
manufacturers will even specify by continent
(Asia, Europe, USA, etc.).

OBD-ll system general
description

3

The OBD-ll system consists of an on-

board computer, known as the Powertrain
Control Module (PCM) and information sen-
sors which monitor various functions of the
engine and then relay the data to the PCM.

Based on the data received and the informa-

Chapter 6

Emissions

and engine

control

systems

6-3

tion programmed into the computer's mem-

or

y, the PCM then generates output signals

to control various engine functions via control
relays, solenoids and other output actuators.
4

The PCM, located in the engine com-

partment and mounted to a bracket between
the air filter housing and the Power Distribu-
tion Center (PDC), is the "brain" of the OBD-ll
system. The PCM is specifically calibrated to
optimize the emissions, fuel economy and
driveability of the vehicle.
5

Because of a Federally mandated

extended warranty which covers the OBD-II
system components and because any
owner-induced damage to the PCM, the sen-
sors and/or the control devices may void the
warranty, it is not recommended to attempt
diagnosis of, or replace the PCM at home
while the vehicle is under warranty. Take the
vehicle to your local dealer service depart-
ment if the PCM or a system component mal-
functions.

Information sensors

6

The following is a list of the OBD-II sys-

tem information sensors. For complete infor-

mation and service procedures, refer to Sec-
tion 3 (unless otherwise specified).

Brake switch
Camshaft Position
sensor
Crankshaft Position sensor
Engine Coolant Temperature (ECT) sensor
Intake Air Temperature (IAT) sensor
Knock
sensor
Leak Detection Pump (LDP) (see

Section 7)

Manifold Absolute Pressure (MAP) sensor
Oxygen sensors
PARK/NEUTRAL switch (see Chapter 7B)
Power steering pressure switch
Throttle Position Sensor (TPS)
Vehicle Speed
Sensor (VSS) (vehicles

equipped with manual transaxle only)

Output actuators

7

The following is a list of the OBD-II sys-

tem output actuators. For complete informa-
tion and service procedures, refer to the
Chapter or Section as specified.

Air conditioning clutch relay (see

Section 3)

Automatic Shutdown relay (ASD) (see

Chapter 4)

Canister purge control solenoid (see

Section 7)

EGR solenoid (see Section 6)
Fuel injectors
(see Chapter 4)
Fuel pump relay (see Chapter 4)

Idle Air Control (IAC) motor (see

Chapter 4)

CHECK ENGINE light or
Malfunction Indicator Light
(MIL)

General description

8

The CHECK ENGINE light or Malfunc-

tion Indicator Light (MIL), is located in the

instrument panel and should illuminate for

2.11 The OBD-ll diagnostic connector

(arrow) is located under the left (driver's)

side of the instrument panel

three seconds as a bulb test each time the
engine is started. When the Powertrain Con-
trol Module (PCM) detects a fault in the emis-
sions or engine control system it sets a trou-
ble code in the PCM's memory. If the PCM
detects a fault related to vehicle emissions, it
ill uminates the CHECK ENGINE light which
means an emissions component or system is
in need of immediate service. In the event the
PCM detects an active engine misfire, the
CHECK ENGINE light will flash continuously.
If this occurs, turn off the engine as soon as
possible and diagnose/correct the problem

or severe catalytic converter damage may
occur.
9

The EVAP system (see Section 7),

except on 1995 models, is pressurized by a

Leak Detection Pump (LDP). If normal system
pressure cannot be achieved by the LDP,

which indicates a fuel vapor leak, the PCM
will store the appropriate fault code and illu-
minate the CHECK ENGINE light on the
instrument panel. The most common cause
of CHECK ENGINE light illumination is EVAP
system pressure loss due to a loose or poor
sealing fuel filler cap. Before accessing the
trouble codes and trying to determine the
faulty component, make sure your gas cap
seal is free from defects and is tightened
securely. Caution: Over-tightening the gas
cap may cause the fuel tank filler neck to
crack.
10 In addition to notifying the driver when
an emissions fault has occurred, the CHECK
ENGINE light can be used to display the
stored trouble codes from the PCM's mem-
ory (see below).

Trouble code access

Refer to illustration 2.11
Note: All models covered by this manual are

equipped with the OBD-ll system. Generic

trouble codes on 1997 and earlier models can

be accessed using the ignition key method,
but it is
necessary to use a SCAN tool to read
and interpret manufacturer-specific trouble
codes (or any trouble codes on
1998 models).
Before outputting the trouble
codes, thor-
oughly inspect ALL electrical connectors and

hoses. Make sure all electrical connections
are tight, clean and free of corrosion; make
sure all hoses are properly connected, fit
tightly and are in good condition (no cracks or
tears).

11

The self-diagnosis information contained

in the PCM (computer) can be accessed
either by the ignition key or by using a scan
tool. This tool is attached to the diagnostic
connector (see illustration) located under the
left (driver's) side of the instrument panel in
the passenger compartment and reads the
codes and parameters on the digital display
screen. The tool is expensive and most home
mechanics prefer to use the alternate
method. The drawback with the ignition key
method is that it does not access all the avail-
able codes for display. Most problems can be
solved or diagnosed quite easily and if the
information cannot be obtained readily, have
the vehicle's self-diagnosis system analyzed
by a dealer service department or other qual-
ified repair shop.
12

To obtain the codes using the ignition

key method, first set the parking brake and
put the shift lever in Park. Raise the engine
speed to approximately 2,500 rpm and slowly
let the speed down to idle. Also, if equipped,
cycle the air conditioning system (on briefly,
then off). Next, on models equipped with an
automatic transaxle, apply the brakes and
select each position on the transmission
(Reverse, Drive, Low etc.), finally bring the
shifter back to Park and turn off the engine.

This will allow the computer to obtain any

fault codes that might be linked to any of the
sensors controlled by the transmission,
engine speed or air conditioning system.
13

To display the codes on the instrument

panel (CHECK ENGINE light or Malfunction
Indicator Light), with the engine NOT running,

turn the ignition key ON, OFF, ON, OFF and
finally ON (must be done within 5 seconds).
The codes will begin to flash. The light will

blink the number of the first digit then pause
and blink the number of the second digit. For
example: Code 23, air temperature sensor

circuit, would be indicated by two flashes,

pause, three flashes.
14

Certain criteria must be met for a fault

code to be entered into the PCM's memory.
The criteria might be a specific range of
engine rpm, engine temperature or input volt-
age to the PCM. It's possible that a fault code
for a particular monitored circuit may not be
entered into the memory despite a malfunc-
tion. This may happen because one of the
fault code criteria has not been met. For
example, the engine must be operating
between 750 and 2,000 rpm in order to moni-
tor the MAP sensor circuit correctly. If the
engine speed is raised above 2,400 rpm, the
MAP sensor output circuit shorts to ground
and will not allow a fault code to be entered
into the memory. Then again, the exact
opposite could occur: A code is entered into
the memory that suggests a malfunction
within another component that is not moni-
tored by the computer. For example, a fuel
pressure problem cannot register a fault

6

6-4

Chapter 6 Emissions and engine control systems

directly but instead, it will cause a rich or lean
fuel mixture problem. Consequently, this will
cause an oxygen sensor malfunction result-
ing in a stored code in the computer for the
oxygen sensor. Be aware of the interrelation-
ship of the sensors and circuits and the over-
all relationship of the emissions control and

fuel injection systems. A trouble code does

not identify which component in a circuit is

faulty, therefore the code should be treated
as a symptom, not the direct cause of the
problem.

15

The accompanying table is a list of the

typical trouble codes which may be encoun -

tered while diagnosing the system. Also

included are simplified troubleshooting pro-
cedures. If the problem persists after these

checks have been made, more detailed ser-
vice procedures will have to be performed by
a dealer service department or other qualified

repair shop.

Trouble codes - 1995 through 1997 models (using CHECK ENGINE light)

Note: Not all trouble codes apply to all models.

Code 11 ................. Intermittent loss of crankshaft and/or camshaft position sensor signals to PCM.
Code 12.................Problem with the battery connection. Direct battery input to PCM disconnected within the last 50 ignition key-on cycles.
Code 13** .............. Problem with the MAP sensor circuit.
Code 14** .............. MAP sensor voltage out of normal range.
Code 15** .............. A problem with the Vehicle Speed Sensor signal. No Vehicle Speed Sensor signal detected during road load conditions.
Code 16.................No input signal from knock sensor.
Code 17 .................Engine is cold too long. Engine coolant temperature remains below normal operating temperatures during initial operation

(check the thermostat).

Code 21**.............. Problem with oxygen sensor signal circuit. Sensor voltage to computer not fluctuating.
Code 22**.............. Engine coolant temperature sensor voltage out of normal range.
Code 23**.............. Intake air temperature sensor voltage out of normal range.
Code 24**..............Throttle position sensor voltage high or low. Test the throttle position sensor.
Code 25**.............. Idle Air Control (IAC) valve circuits. A shorted condition is detected in one or more of the IAC valve circuits. Or a vacuum

leak is detected.

Code 27.................One of the injector control circuit output drivers does not respond properly to the control signal. Check the circuits.
Code 31**.............. EVAP system fault.
Code 32**..............An open or shorted condition detected in the EGR solenoid circuit. Possible air/fuel ratio imbalance not detected

during diagnosis.

Code 33.................Air conditioning clutch relay circuit. An open or shorted condition detected in the compressor clutch relay circuit.
Code 34.................Open or shorted condition detected in the speed control vacuum or vent solenoid circuits.
Code 35.................Open or shorted condition detected

in

the radiator fan high or low speed relay circuits.

Code 37**..............Transaxle PARK/NEUTRAL switch failure.
Code 41 *** .............Problem with the charging system. An open or shorted condition detected in the alternator field control circuit.
Code 42.................Fuel pump relay or auto shutdown relay (ASD) control circuit indicates an open or shorted circuit condition.
Code 43** .............. Multiple cylinder misfire detected. Peak primary circuit current not achieved with the maximum dwell time.
Code 44** .............. Battery temperature sensor voltage circuit.
Code 45.................Transaxle fault present in transmission control module - automatic transaxles.
Code 46***.............Charging system voltage too high. Computer indicates that the battery voltage is not properly regulated.
Code 47***.............Charging system voltage too low. Battery voltage sensor input below target charging voltage during engine operation and

no significant change in voltage detected during active test of alternator output.

Code 51**.............. Oxygen sensor signal input indicates lean fuel/air ratio condition during engine operation.
Code 52**.............. Oxygen sensor signal input indicates rich fuel/air ratio condition during engine operation.
Code 53** .............. Internal PCM failure detected.
Code 54**.............. No camshaft position sensor signal from distributor. Problem with the distributor synchronization circuit.
Code 55.................Completion of fault code display on CHECK ENGINE light. This is the end of stored codes.
Code 61................. MAP sensor out of range.
Code 62.................Unsuccessful attempt to update EMR mileage in the controller EEPROM.
Code 63**.............. Controller failure. EEPROM write denied. Check the PCM.
Code 64**.............. Catalytic converter efficiency below required level.
Code 65**.............. Power steering switch failure or no release of brake switch detected.
Code 66.................Transmission control module (TCM) or body control module (BCM) not sensed by PCM.
Code 71................. PCM output voltage low.
Code 72**..............Catalytic converter efficiency below required level.
Code 77.................Speed Control relay fault.

** These codes illuminate the

CHECK ENGINE

light on the instrument panel during engine operation once the trouble code has been recorded.

***These codes illuminate the

charging

system light (battery) on the instrument panel during engine operation once the trouble code has been

recorded.

Chapter 6 Emissions and engine control systems

6-5

Trouble codes - using scan tool

Note: These are "generic" trouble codes and pertain to all models covered by this manual.

Code

Probable cause

P0102..........................Mass Airflow (MAF) sensor circuit low input
P0103..........................Mass Airflow (MAF) sensor circuit high input
P0106..........................Barometric pressure out of range
P0107..........................Manifold Absolute Pressure (MAP) sensor voltage too low
P0108..........................Manifold Absolute Pressure (MAP) sensor voltage too high
P0112..........................Intake Air Temperature (IAT) sensor circuit low input
P0113..........................Intake Air Temperature (IAT) sensor circuit high input
P0117..........................Electronic Coolant Temperature (ECT) sensor circuit low input
P0118..........................Electronic Coolant Temperature (ECT) sensor circuit high input
P0121.......................... In range Throttle Position Sensor (TPS) fault
P0122......................... Throttle Position Sensor (TPS) circuit low input
P0123......................... Throttle Position Sensor (TPS) circuit high input
P0131.......................... Upstream heated 02 sensor circuit low voltage (Bank 1)
P0132..........................Upstream heated 02 sensor shorted to voltage
P0133..........................Upstream heated 02 sensor circuit slow response (Bank 1)
P0135..........................Upstream heated 02 sensor heater circuit fault (Bank 1)
P0136..........................Downstream heated 02 sensor fault (Bank 1)
P0138..........................Downstream heated 02 sensor shorted to voltage
P0140..........................Downstream heated 02 sensor - neither rich nor lean condition detected
P0141 .......................... Downstream heated 02 sensor heater circuit fault (Bank 1)
P0151 .......................... Upstream heated 02 sensor circuit low voltage (Bank 2)

P0153..........................Upstream heated 02 sensor circuit slow response (Bank 2)
P0155..........................Upstream heated 02 sensor heater circuit fault (Bank 2)
P0156..........................Downstream heated 02 sensor fault (Bank 2)
P0161.......................... Downstream heated 02 sensor heater circuit fault (Bank 2)
P0171..........................System Adaptive fuel too lean (Bank 1)
P0172..........................System Adaptive fuel too rich (Bank 1)
P0174..........................System Adaptive fuel too lean (Bank 2)
P0172..........................System Adaptive fuel too rich (Bank 2)
P0191..........................Injector Pressure sensor system performance
P0192..........................Injector Pressure sensor circuit low input
P0193..........................Injector Pressure sensor circuit high input
P0201..........................Injector no. 1 output driver not responding properly
P0202..........................Injector no. 2 output driver not responding properly
P0203..........................Injector no. 3 output driver not responding properly
P0204..........................Injector no. 4 output driver not responding properly
P0205..........................Injector no. 5 output driver not responding properly
P0206..........................Injector no. 6 output driver not responding properly
P0300..........................Multiple cylinder misfiring detected
P0301.......................... Cylinder no. 1 misfire detected
P0302..........................Cylinder no. 2 misfire detected
P0303..........................Cylinder no. 3 misfire detected
P0304..........................Cylinder no. 4 misfire detected
P0305..........................Cylinder no. 5 misfire detected
P0306..........................Cylinder no. 6 misfire detected
P0325..........................Knock sensor circuit fault

P0326..........................Knock sensor circuit performance
P0351.......................... Ignition coil no. 1 primary circuit fault
P0352 ..........................Ignition coil no. 2 primary circuit fault
P0353 ..........................Ignition coil no. 3 primary circuit fault
P0354 ..........................Ignition coil no. 4 primary circuit fault
P0355 ..........................Ignition coil no. 5 primary circuit fault

6

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