Nissan 240SX — Automatic Transmission (Section AT) (2000 year). Manual — part 7

Diagnostic Procedure

NMAT0219

1

CHECK INPUT SIGNAL.

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 “VHCL/S SE·MTR” while driving.

Check the value changes according to driving speed.

SAT614J

Without CONSULT-II

1. Start engine.
2. Check voltage between TCM harness connector M26 terminal No. 40 (W/PU) and ground while driving at 2 to 3 km/h

(1 to 2 MPH) for 1 m (3 ft) or more.

SAT528JA

Does battery voltage vary between less than 1V and more than 4.5V?

Yes

©

GO TO 2.

No

©

Check the following items:

I

Vehicle speed sensor and ground circuit for vehicle speed sensor (Refer to EL-58,
“Component Parts and Harness Connector Location”.)

I

Harness for short or open between TCM and vehicle speed sensor (Main harness)

I

Harness for short or open between ABS control unit and combination meter

2

CHECK DTC

Perform Self-diagnosis Code confirmation procedure, AT-95.

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.

GI

MA

EM

LC

EC

FE

CL

MT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSIS FOR VHCL SPEED SEN·MTR

Diagnostic Procedure

AT-97

SAT413K

Description

NMAT0220

I

Throttle position sensor
The throttle position sensor detects the throttle valve position
and sends a signal to the TCM.

I

Throttle position switch
Consists of a wide open throttle position switch and a closed
throttle position switch. The wide open position switch sends
a signal to the TCM when the throttle valve is open at least 1/2
of the full throttle position. The closed throttle position switch
sends a signal to the TCM when the throttle valve is fully
closed.

CONSULT-II REFERENCE VALUE IN DATA MONITOR
MODE

NMAT0220S01

Remarks: Specification data are reference values.

Monitor item

Condition

Specification

Throttle position sensor

Fully-closed throttle

Approximately 0.5V

Fully-open throttle

Approximately 4V

TCM TERMINALS AND REFERENCE VALUE

NMAT0220S02

Remarks: Specification data are reference values.

Terminal

No.

Wire color

Item

Condition

Judgement

standard

(Approx.)

16

LG

Closed throttle
position switch
(in throttle
position switch)

When releasing accelerator pedal after
warming up engine.

Battery voltage

When depressing accelerator pedal after
warming up engine.

0V

17

R

Wide open throttle
position switch
(in throttle
position switch)

When depressing accelerator pedal more
than half-way after warming up engine.

Battery voltage

When releasing accelerator pedal after
warming up engine.

0V

32

LG/R

Throttle position
sensor
(Power source)

Ignition switch “ON”.

4.5 - 5.5V

Ignition switch “OFF”.

0V

41

R/Y

Throttle position
sensor

When depressing accelerator pedal slowly
after warming up engine.
(Voltage rises gradually in response to
throttle position.)

Fully-closed
throttle:
0.5V
Fully-open
throttle:
4V

42

G/Y

Throttle position
sensor
(Ground)

—

0V

TROUBLE DIAGNOSIS FOR THROTTLE POSI SEN

Description

AT-98

ON BOARD DIAGNOSIS LOGIC

=NMAT0220S03

Diagnostic trouble code

Malfunction is detected when ...

Check item (Possible cause)

: THROTTLE POSI SEN

TCM receives an excessively low or high
voltage from the sensor.

I

Harness or connectors
(The solenoid circuit is open or shorted.)

I

Throttle position sensor

I

Throttle position switch

: 3rd judgement flicker

SAT014K

SAT808H

SELF-DIAGNOSIS CODE CONFIRMATION PROCEDURE

NMAT0220S05

After the repair, perform the following procedure to confirm the
malfunction is eliminated.

WITH CONSULT-II

NMAT0220S06

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 1/2 of the full
throttle position and driving for more than 3 seconds.

WITHOUT CONSULT-II

NMAT0220S07

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 1/2 of the full
throttle position and driving for more than 3 seconds.

3)

Perform self-diagnosis.
Refer

to

SELF-DIAGNOSTIC

PROCEDURE

(Without

CONSULT-II), AT-37.

GI

MA

EM

LC

EC

FE

CL

MT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSIS FOR THROTTLE POSI SEN

Description (Cont’d)

AT-99

Wiring Diagram — AT — TPS

NMAT0221

TAT257

TROUBLE DIAGNOSIS FOR THROTTLE POSI SEN

Wiring Diagram — AT — TPS

AT-100

Diagnostic Procedure

NMAT0222

1

CHECK DTC WITH ECM

Perform diagnostic test mode II (self-diagnostic results) for engine control. Refer to EC-35, “Description”.

OK or NG

OK

©

GO TO 2.

NG

©

Check throttle position sensor circuit for engine control. Refer to EC-141, “Component
Description”.

GI

MA

EM

LC

EC

FE

CL

MT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSIS FOR THROTTLE POSI SEN

Diagnostic Procedure

AT-101

2

CHECK INPUT SIGNAL

With CONSULT-II

1. Turn ignition switch to “ON” position.

(Do not start engine.)

2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Read out the value of “THRTL POS SEN”.

Voltage:

Fully-closed throttle:

Approximately 0.5V

Fully-open throttle:

Approximately 4V

SAT614J

Without CONSULT-II

1. Turn ignition switch to “ON” position.

(Do not start engine.)

2. Check voltage between TCM harness connector M26 terminal Nos. 41 (R/Y) and 42 (GY) while accelerator pedal is

depressed slowly.

Voltage:

Fully-closed throttle valve:

Approximately 0.5V

Fully-open throttle valve:

Approximately 4V

(Voltage rises gradually in response to throttle position.)

SAT513JC

OK or NG

OK (With CONSULT-II)

©

GO TO 3.

OK (Without CONSULT-
II)

©

GO TO 4.

NG

©

Check harness for short or open between ECM and TCM regarding throttle position sen-
sor circuit. (Main harness)

TROUBLE DIAGNOSIS FOR THROTTLE POSI SEN

Diagnostic Procedure (Cont’d)

AT-102

3

CHECK THROTTLE POSITION SWITCH CIRCUIT (With CONSULT-II)

With CONSULT-II

1. Turn ignition switch to “ON” position.

(Do not start engine.)

2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Read out “CLOSED THL/SW” and “W/O THRL/P-SW” depressing and releasing accelerator pedal.

Check the signal of throttle position switch is indicated properly.

MTBL0011

SAT646J

OK or NG

OK

©

GO TO 5.

NG

©

Check the following items:

I

Throttle position switch
Refer to “Component Inspection”, AT-105.

I

Harness for short or open between ignition switch and throttle position switch (Main
harness)

I

Harness for short or open between throttle position switch and TCM (Main harness)

GI

MA

EM

LC

EC

FE

CL

MT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSIS FOR THROTTLE POSI SEN

Diagnostic Procedure (Cont’d)

AT-103

4

CHECK THROTTLE POSITION SWITCH CIRCUIT (Without CONSULT-II)

Without CONSULT-II

1. Turn ignition switch to “ON” position.

(Do not start engine.)

2. Check voltage between TCM harness connector M25 terminal Nos. 16 (LG), 17 (R) and ground while depressing, and

releasing accelerator pedal slowly. (after warming up engine)

MTBL0637

SAT526JC

OK or NG

OK

©

GO TO 5.

NG

©

Check the following items:

I

Throttle position switch
Refer to “Component Inspection”, AT-105.

I

Harness for short or open between ignition switch and throttle position switch (Main
harness)

I

Harness for short or open between throttle position switch and TCM (Main harness)

5

CHECK DTC

Perform Self-diagnosis Code confirmation procedure, AT-99.

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.

TROUBLE DIAGNOSIS FOR THROTTLE POSI SEN

Diagnostic Procedure (Cont’d)

AT-104

SAT851JC

Component Inspection

NMAT0223

THROTTLE POSITION SWITCH

NMAT0223S01

Closed Throttle Position Switch (Idle position)

NMAT0223S0101

I

Check continuity.

Terminals

Connector

Accelerator

pedal condi-

tion

Terminal No. (Wire color)

Continuity

F34

Released

4 (LG)

5 (G/OR)

Yes

Depressed

No

I

To adjust closed throttle position switch, refer to EC-50, “Basic
Inspection”.

SAT852JC

Wide Open Throttle Position Switch

NMAT0223S0102

I

Check continuity.

Terminals

Connector

Accelerator

pedal condi-

tion

Terminal No. (Wire color)

Continuity

F34

Released

5 (G/OR)

6 (R)

No

Depressed

Yes

GI

MA

EM

LC

EC

FE

CL

MT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSIS FOR THROTTLE POSI SEN

Component Inspection

AT-105

SAT341H

Description

NMAT0224

Shift solenoid valves A and B are turned “ON” or “OFF” by the TCM
in response to signals sent from the PNP switch, vehicle speed and
throttle position sensors. Gears will then be shifted to the optimum
position.

Gear position

1

2

3

4

Shift solenoid valve A

ON (Closed)

OFF (Open)

OFF (Open)

ON (Closed)

Shift solenoid valve B

ON (Closed)

ON (Closed)

OFF (Open)

OFF (Open)

TCM TERMINALS AND REFERENCE VALUE

NMAT0224S01

Remarks: Specification data are reference values.

Terminal

No.

Wire color

Item

Condition

Judgement

standard

(Approx.)

11

R/W

Shift solenoid
valve A

When shift solenoid valve A operates.
(When driving in “D

1

” or “D

4

”.)

Battery voltage

When shift solenoid valve A does not oper-
ate.
(When driving in “D

2

” or “D

3

”.)

0V

ON BOARD DIAGNOSIS LOGIC

NMAT0224S02

Diagnostic trouble code

Malfunction is detected when ...

Check item (Possible cause)

: SHIFT SOLENOID/V A

TCM detects an improper voltage drop
when it tires to operate the solenoid
valve.

I

Harness or connectors
(The solenoid circuit is open or shorted.)

I

Shift solenoid valve A

: 4th judgement flicker

TROUBLE DIAGNOSIS FOR SHIFT SOLENOID/V A

Description

AT-106

SAT014K

SAT809H

SELF-DIAGNOSIS CODE CONFIRMATION PROCEDURE

=NMAT0224S04

After the repair, perform the following procedure to confirm the
malfunction is eliminated.

WITH CONSULT-II

NMAT0224S05

1)

Start engine.

2)

Select “SELF-DIAG RESULTS” mode for “A/T” with CON-
SULT-II.

3)

Drive vehicle in D

1

,

D

2

position.

WITHOUT CONSULT-II

NMAT0224S06

1)

Start engine.

2)

Drive vehicle in D

1

,

D

2

position.

3)

Perform self-diagnosis.
Refer

to

SELF-DIAGNOSTIC

PROCEDURE

(Without

CONSULT-II), AT-37.

GI

MA

EM

LC

EC

FE

CL

MT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSIS FOR SHIFT SOLENOID/V A

Description (Cont’d)

AT-107

Wiring Diagram — AT — SSV/A

NMAT0225

TAT258

TROUBLE DIAGNOSIS FOR SHIFT SOLENOID/V A

Wiring Diagram — AT — SSV/A

AT-108

Diagnostic Procedure

NMAT0226

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. 2 (R/W) and

ground.

SAT448K

Is resistance approx. 20 - 40

Ω

?

Yes

©

GO TO 2.

No

©

1. Remove control valve assembly.

Refer to AT-205.

2. Check the following items:

I

Shift solenoid valve A
Refer to “Component Inspection”, AT-110.

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. 2 (R/W) and TCM harness connector

M25 terminal No. 11 (R/W).

SAT801JA

If OK, check harness for short to ground and short to power.

Is resistance approx. 0

Ω

?

Yes

©

GO TO 3.

No

©

Repair open circuit or short to ground or short to power in harness or connectors.

GI

MA

EM

LC

EC

FE

CL

MT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSIS FOR SHIFT SOLENOID/V A

Diagnostic Procedure

AT-109

3

CHECK DTC

Perform Self-diagnosis Code confirmation procedure, AT-107.

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.

SAT654IA

Component Inspection

NMAT0227

SHIFT SOLENOID VALVE A

NMAT0227S01

I

For removal, refer to AT-205.

Resistance Check

NMAT0227S0101

I

Check resistance.

Terminal

Connector

Terminal No. (Wire color)

Resistance

(Approx.)

Ω

E402

3 (L)

Ground

20 - 40

SAT653IA

Operation Check

NMAT0227S0102

I

Check solenoid valve by listening for its operating sound while
applying battery voltage to the solenoid valve harness connec-
tor (terminal cord assembly) E402 terminal No. 3 (L) and
ground.

TROUBLE DIAGNOSIS FOR SHIFT SOLENOID/V A

Diagnostic Procedure (Cont’d)

AT-110

SAT341H

Description

NMAT0228

Shift solenoid valves A and B are turned “ON” or “OFF” by the TCM
in response to signals sent from the PNP switch, vehicle speed and
throttle position sensors. Gears will then be shifted to the optimum
position.

Gear position

1

2

3

4

Shift solenoid valve A

ON (Closed)

OFF (Open)

OFF (Open)

ON (Closed)

Shift solenoid valve B

ON (Closed)

ON (Closed)

OFF (Open)

OFF (Open)

TCM TERMINALS AND REFERENCE VALUE

NMAT0228S01

Remarks: Specification data are reference values.

Terminal

No.

Wire color

Item

Condition

Judgement

standard

(Approx.)

12

OR/L

Shift solenoid
valve B

When shift solenoid valve B operates.
(When driving in “D

1

” or “D

2

”.)

Battery voltage

When shift solenoid valve B does not oper-
ate.
(When driving in “D

3

” or “D

4

”.)

0V

ON BOARD DIAGNOSIS LOGIC

NMAT0228S02

Diagnostic trouble code

Malfunction is detected when ...

Check item (Possible cause)

: SHIFT SOLENOID/V B

TCM detects an improper voltage drop
when it tires to operate the solenoid
valve.

I

Harness or connectors
(The solenoid circuit is open or shorted.)

I

Shift solenoid valve B

: 5th judgement flicker

GI

MA

EM

LC

EC

FE

CL

MT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSIS FOR SHIFT SOLENOID/V B

Description

AT-111

SAT014K

SAT812H

SELF-DIAGNOSIS CODE CONFIRMATION PROCEDURE

=NMAT0228S04

After the repair, perform the following procedure to confirm the
malfunction is eliminated.

WITH CONSULT-II

NMAT0228S05

1)

Start engine.

2)

Select “SELF-DIAG RESULTS” mode for “A/T” with CON-
SULT-II.

3)

Drive vehicle in D

1

,

D

2

,

D

3

position.

WITHOUT CONSULT-II

NMAT0228S06

1)

Start engine.

2)

Drive vehicle in D

1

,

D

2

,

D

3

position.

3)

Perform self-diagnosis.
Refer

to

SELF-DIAGNOSTIC

PROCEDURE

(Without

CONSULT-II), AT-37.

TROUBLE DIAGNOSIS FOR SHIFT SOLENOID/V B

Description (Cont’d)

AT-112