Nissan 240SX - Automatic Transmission (Section AT) (2000 year). Instruction - part 9
4
CHECK TCM GROUND CIRCUIT
1. Turn ignition switch to OFF position.
2. Disconnect TCM harness connector.
3. Check continuity between TCM terminal Nos. 25, 48 and ground. Refer to “Wiring Diagram — AT — BA/FTS”, AT-127.
Continuity should exist.
If OK, check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 5.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
5
CHECK A/T FLUID TEMPERATURE SENSOR WITH TERMINAL CORD ASSEMBLY
1. Turn ignition switch to “OFF” position.
2. Disconnect solenoid valve harness connector (terminal cord assembly) E25 in engine compartment.
3. Check resistance between solenoid valve harness connector (terminal cord assembly) E25 terminals No. 6 (W) and No.
7 (B) when A/T is cold [20°C (68°F)].
SAT734JA
Is resistance approx. 2.5 k
Ω
?
Yes
©
GO TO 6.
No
©
1. Remove oil pan.
2. Check the following items:
I
A/T fluid temperature sensor
Refer to “Component Inspection”, AT-131.
I
Harness of terminal cord assembly for short or open
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TROUBLE DIAGNOSIS FOR BATT/FLUID TEMP SEN
Diagnostic Procedure (Cont’d)
AT-129
6
CHECK INPUT SIGNAL OF A/T FLUID TEMPERATURE SENSOR
With CONSULT-II
1. Start engine.
2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Read out the value of “FLUID TEMP SE”.
Voltage:
Cold [20°C (68°F)]
→
Hot [80°C (176°F)]:
Approximately 1.5V
→
0.5V
SAT614J
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM harness connector M26 terminal No. 47 (W/R) and ground while warming up A/T.
Voltage:
Cold [20°C (68°F)]
→
Hot [80°C (176°F)]:
Approximately 1.5V
→
0.5V
SAT518JA
OK or NG
OK
©
GO TO 7.
NG
©
Check the following item:
I
Harness for short or open between TCM and terminal cord assembly (Main harness)
7
CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation Procedure, AT-126.
OK or NG
OK
©
INSPECTION END
NG
©
I
Perform TCM input/output signal inspection.
I
If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
TROUBLE DIAGNOSIS FOR BATT/FLUID TEMP SEN
Diagnostic Procedure (Cont’d)
AT-130
SAT448K
Component Inspection
NMAT0243
A/T FLUID TEMPERATURE SENSOR
NMAT0243S01
I
For removal, refer to AT-205.
I
Check resistance.
Terminals
Connector
Terminal No. (Wire color)
Temperature
°C (°F)
Resistance
(Approx.) k
Ω
E25
6 (W)
7 (B)
20 (68)
2.5
80 (176)
0.3
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TROUBLE DIAGNOSIS FOR BATT/FLUID TEMP SEN
Component Inspection
AT-131
Description
NMAT0244
The engine speed signal is sent from the ECM to the TCM.
TCM TERMINALS AND REFERENCE VALUE
NMAT0244S01
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
39
L/OR
Engine speed
signal
Refer to EC-76, “ECM Inspection Table”.
ON BOARD DIAGNOSIS LOGIC
NMAT0244S02
Diagnostic trouble code
Malfunction is detected when ...
Check item (Possible cause)
: ENGINE SPEED SIG
TCM does not receive the proper voltage
signal from ECM.
I
Harness or connectors
(The sensor circuit is open or shorted.)
: 9th judgement flicker
SAT014K
SAT823H
SELF-DIAGNOSIS CODE CONFIRMATION PROCEDURE
NMAT0244S04
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
WITH CONSULT-II
NMAT0244S05
1)
Start engine.
2)
Select “SELF-DIAG RESULTS” mode for “A/T” with CON-
SULT-II.
3)
Drive vehicle under the following conditions:
Selector lever in “D” position, vehicle speed higher than 10
km/h (6 MPH), throttle opening greater than 1/8 of the full
throttle position and driving for more than 10 seconds.
WITHOUT CONSULT-II
NMAT0244S06
1)
Start engine.
2)
Drive vehicle under the following conditions:
Selector lever in “D” position, vehicle speed higher than 10
km/h (6 MPH), throttle opening greater than 1/8 of the full
throttle position and driving for more than 10 seconds.
3)
Perform self-diagnosis.
Refer
to
SELF-DIAGNOSTIC
PROCEDURE
(Without
CONSULT-II), AT-37.
TROUBLE DIAGNOSIS FOR ENGINE SPEED SIG
Description
AT-132
Wiring Diagram — AT — ENGSS
NMAT0245
TAT263
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TROUBLE DIAGNOSIS FOR ENGINE SPEED SIG
Wiring Diagram — AT — ENGSS
AT-133
Diagnostic Procedure
NMAT0246
1
CHECK DTC WITH ECM
Perform diagnostic test mode II (self-diagnostic results) for engine control. Check ignition signal circuit condition.
OK or NG
OK (With CONSULT-II)
©
GO TO 2.
OK (Without CONSULT-
II)
©
GO TO 3.
NG
©
Check ignition signal circuit for engine control. Refer to EC-110, “Component Descrip-
tion”.
2
CHECK INPUT SIGNAL (WITH CONSULT-II)
With CONSULT-II
1. Start engine.
2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Read out the value of “ENGINE SPEED”.
Check engine speed changes according to throttle position.
SAT645J
OK or NG
OK
©
GO TO 4.
NG
©
Check the following items:
I
Harness for short or open between TCM and ECM
I
Resistor
I
Ignition coil
Refer to EC-110, “Component Description”.
TROUBLE DIAGNOSIS FOR ENGINE SPEED SIG
Diagnostic Procedure
AT-134
3
CHECK INPUT SIGNAL (WITHOUT CONSULT-II)
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM harness connector M26 terminal No. 39 (L/OR) and ground.
SAT520JC
Does battery voltage (idle speed)? Refer to EC-76, “ECM Inspection Table”.
Yes
©
GO TO 4.
No
©
Check the following items:
I
Harness for short or open between TCM and ECM
I
Resistor
I
Ignition coil
Refer to EC-110, “Component Description”.
4
CHECK DTC
Perform Self-diagnosis Code confirmation procedure, AT-132.
OK or NG
OK
©
INSPECTION END
NG
©
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
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TROUBLE DIAGNOSIS FOR ENGINE SPEED SIG
Diagnostic Procedure (Cont’d)
AT-135
SAT341H
Description
NMAT0247
The line pressure solenoid valve regulates the oil pump discharge
pressure to suit the driving condition in response to a signal sent
from the TCM.
The line pressure duty cycle value is not consistent when the
closed throttle position switch is “ON”. To confirm the line
pressure duty cycle at low pressure, the accelerator (throttle)
should be open until the closed throttle position switch is
“OFF”.
CONSULT-II REFERENCE VALUE IN DATA MONITOR
MODE
NMAT0247S01
Remarks: Specification data are reference values.
Monitor item
Condition
Specification
Line pressure solenoid
valve duty
Small throttle opening (Low line pressure)
"
Large throttle opening (High line pressure)
Approximately 24%
"
Approximately 95%
NOTE:
The line pressure duty cycle value is not consistent when the closed throttle position switch is “ON”. To confirm the line pressure duty
cycle at low pressure, the accelerator (throttle) should be open until the closed throttle position switch is “OFF”.
TCM TERMINALS AND REFERENCE VALUE
NMAT0247S02
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
1
OR/B
Line pressure
solenoid valve
When releasing accelerator pedal after warm-
ing up engine.
1.5 - 2.5V
When depressing accelerator pedal fully after
warming up engine.
0V
2
P
Line pressure
solenoid valve
(with dropping
resistor)
When releasing accelerator pedal after warm-
ing up engine.
5 - 14V
When depressing accelerator pedal fully after
warming up engine.
0V
ON BOARD DIAGNOSIS LOGIC
NMAT0247S03
Diagnostic trouble code
Malfunction is detected when ...
Check item (Possible cause)
: LINE PRESSURE S/V
TCM detects an improper voltage drop
when it tries to operate the solenoid
valve.
I
Harness or connectors
(The solenoid circuit is open or shorted.)
I
Line pressure solenoid valve
: 10th judgement flicker
TROUBLE DIAGNOSIS FOR LINE PRESSURE S/V
Description
AT-136
SAT014K
SAT824H
SELF-DIAGNOSIS CODE CONFIRMATION PROCEDURE
NMAT0247S05
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
WITH CONSULT-II
NMAT0247S06
1)
Start engine.
2)
Select “SELF-DIAG RESULTS” mode for “A/T” with CON-
SULT-II.
3)
With brake pedal depressed, shift the lever from “P”
,
“N”
,
“D”
,
“N”
,
“P” positions.
WITHOUT CONSULT-II
NMAT0247S07
1)
Start engine.
2)
With brake pedal depressed, shift the lever from “P”
,
“N”
,
“D”
,
“N”
,
“P” positions.
3)
Perform self-diagnosis.
Refer
to
SELF-DIAGNOSTIC
PROCEDURE
(Without
CONSULT-II), AT-37.
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TROUBLE DIAGNOSIS FOR LINE PRESSURE S/V
Description (Cont’d)
AT-137
Wiring Diagram — AT — LPSV
NMAT0248
TAT264
TROUBLE DIAGNOSIS FOR LINE PRESSURE S/V
Wiring Diagram — AT — LPSV
AT-138
Diagnostic Procedure
NMAT0249
1
CHECK GROUND CIRCUIT
1. Turn ignition switch to “OFF” position.
2. Disconnect solenoid valve harness connector (terminal cord assembly) E25 connector in engine compartment.
3. Check resistance between solenoid valve harness connector (terminal cord assembly) E25 terminal No. 4 (R) and
ground.
SAT806JA
Is resistance approx. 2.5 - 5
Ω
?
Yes
©
GO TO 2.
No
©
1. Remove control valve assembly.
Refer to AT-205.
2. Check the following items:
I
Line pressure solenoid valve
Refer to “Component Inspection”, AT-140.
I
Harness of terminal cord assembly for short or open
2
CHECK POWER SOURCE CIRCUIT
1. Turn ignition switch to “OFF” position.
2. Disconnect TCM harness connector.
3. Check resistance between solenoid valve harness connector E25 terminal No. 4 (OR/B) and TCM harness connector
M25 terminal No. 2 (P).
SAT807JA
Is resistance approx. 11.2 - 12.8
Ω
?
Yes
©
GO TO 3.
No
©
Check the following items:
I
Dropping resistor
Refer to “Component Inspection”, AT-140.
I
Harness for short or open between TCM terminal 2 and terminal cord assembly (Main
harness)
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TROUBLE DIAGNOSIS FOR LINE PRESSURE S/V
Diagnostic Procedure
AT-139
3
CHECK POWER SOURCE CIRCUIT
1. Turn ignition switch to “OFF” position.
2. Check resistance between solenoid valve harness connector (terminal cord assembly) E25 terminal No. 4 (R) and TCM
harness connector M25 terminal No. 1 (OR/B).
SAT808JA
Is resistance approx. 0
Ω
?
Yes
©
GO TO 4.
No
©
Repair or replace harness between TCM terminal 1 and terminal cord assembly.
4
CHECK DTC
Perform Self-diagnosis Code confirmation procedure, AT-137.
OK or NG
OK
©
INSPECTION END
NG
©
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
SAT657IA
Component Inspection
NMAT0250
LINE PRESSURE SOLENOID VALVE
NMAT0250S01
I
For removal, refer to AT-205.
Resistance Check
NMAT0250S0101
I
Check resistance.
Terminal
Connector
Terminal No. (Wire color)
Resistance
(Approx.)
Ω
E403
6 (R)
Ground
2.5 - 5
TROUBLE DIAGNOSIS FOR LINE PRESSURE S/V
Diagnostic Procedure (Cont’d)
AT-140
SAT658IA
Operation Check
NMAT0250S0102
I
Check solenoid valve by listening for its operating sound while
applying battery voltage to the solenoid valve harness connec-
tor (terminal cord assembly) E403 terminal No. 6 (R) and
ground.
SAT003K
DROPPING RESISTOR
NMAT0250S02
I
Check resistance.
Terminal
Connector
Terminal No. (Wire color)
Resistance
(Approx.)
Ω
F19
1 (OR/B)
2 (P)
11.2 - 12.8
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TROUBLE DIAGNOSIS FOR LINE PRESSURE S/V
Component Inspection (Cont’d)
AT-141
SAT574J
Description
NMAT0207
The TCM consists of a microcomputer and connectors for signal
input and output and for power supply. The unit controls the A/T.
ON BOARD DIAGNOSIS LOGIC
NMAT0207S01
Diagnostic trouble code
Malfunction is detected when ...
Check item (Possible cause)
: CONTROL UNIT (RAM)
: CONTROL UNIT (ROM)
TCM memory (RAM) or (ROM) is mal-
functioning.
TCM
SAT014K
SAT407K
SELF-DIAGNOSIS CODE CONFIRMATION PROCEDURE
NMAT0207S02
NOTE:
If “SELF-DIAGNOSIS CODE CONFIRMATION PROCEDURE”
has been previously conducted, always turn ignition switch
“OFF” and wait at least 5 seconds before conducting the next
test.
WITH CONSULT-II
NMAT0207S03
1)
Turn ignition switch “ON” and select “DATA MONITOR” mode
for A/T with CONSULT-II.
2)
Start engine.
3)
Run engine for at least 2 seconds at idle speed.
TROUBLE DIAGNOSIS FOR CONTROL UNIT (RAM), CONTROL UNIT (ROM)
Description
AT-142
Diagnostic Procedure
=NMAT0208
1
CHECK DTC
With CONSULT-II
1. Turn ignition switch “ON” and select “SELF DIAG RESULTS” mode for A/T with CONSULT-II.
2. Touch “ERASE”.
Perform Self-diagnosis Code confirmation procedure.
See previous page.
Is the “CONTROL UNIT (RAM) or CONTROL UNIT (ROM)” displayed again?
Yes
©
Replace TCM.
No
©
INSPECTION END
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TROUBLE DIAGNOSIS FOR CONTROL UNIT (RAM), CONTROL UNIT (ROM)
Diagnostic Procedure
AT-143
SAT574J
Description
NMAT0215
The TCM consists of a microcomputer and connectors for signal
input and output and for power supply. The unit controls the A/T.
ON BOARD DIAGNOSIS LOGIC
NMAT0215S01
Diagnostic trouble code
Malfunction is detected when ...
Check item (Possible cause)
: CONT UNIT (EEPROM)
TCM memory (EEPROM) is malfunction-
ing.
TCM
SAT014K
SAT407K
SELF-DIAGNOSIS CODE CONFIRMATION PROCEDURE
NMAT0215S02
NOTE:
If “SELF-DIAGNOSIS CODE CONFIRMATION PROCEDURE”
has been previously conducted, always turn ignition switch
“OFF” and wait at least 5 seconds before conducting the next
test.
WITH CONSULT-II
NMAT0215S03
1)
Turn ignition switch “ON” and select “DATA MONITOR” mode
for A/T with CONSULT-II.
2)
Start engine.
3)
Run engine for at least 2 seconds at idle speed.
TROUBLE DIAGNOSIS FOR CONTROL UNIT (EEPROM)
Description
AT-144