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

?

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

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

?

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

?

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)

GI

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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

?

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.)

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.)

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

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