Nissan 240SX - Automatic Transmission (Section AT) (2000 year). Instruction - part 12

15. A/T Does Not Perform Lock-up

=NMAT0084

SYMPTOM:
A/T does not perform lock-up at the specified speed.

1

CHECK SELF-DIAGNOSTIC RESULTS

Does self-diagnosis show damage to torque converter clutch solenoid valve circuit after cruise test?

SAT844H

Yes or No

Yes

©

Check torque converter clutch solenoid valve circuit. Refer to AT-120.

No

©

GO TO 2.

2

CHECK THROTTLE POSITION SENSOR

Check throttle position sensor. Refer to EC-141, “Component Description”.

SAT414K

OK or NG

OK

©

GO TO 3.

NG

©

Repair or replace throttle position sensor.

3

DETECT MALFUNCTIONING ITEM

1. Remove control valve. Refer to AT-205.
2. Check following items:

I

Torque converter clutch control valve

I

Torque converter relief valve

I

Torque converter clutch solenoid valve

I

Pilot valve

I

Pilot filter

OK or NG

OK

©

GO TO 4.

NG

©

Repair or replace damaged parts.

GI

MA

EM

LC

EC

FE

CL

MT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSES FOR SYMPTOMS

15. A/T Does Not Perform Lock-up

AT-177

4

CHECK SYMPTOM

Check again.

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 DIAGNOSES FOR SYMPTOMS

15. A/T Does Not Perform Lock-up (Cont’d)

AT-178

16. A/T Does Not Hold Lock-up Condition

=NMAT0085

SYMPTOM:
A/T does not hold lock-up condition for more than 30 seconds.

1

CHECK DIAGNOSTIC RESULTS

Does self-diagnosis show damage to engine speed signal circuit after cruise test?

SAT835H

Yes or No

Yes

©

Check engine speed signal circuit. Refer to AT-132.

No

©

GO TO 2.

2

CHECK A/T FLUID CONDITION

1. Remove oil pan.
2. Check A/T fluid condition.

SAT171B

OK or NG

OK

©

GO TO 3.

NG

©

GO TO 5.

3

DETECT MALFUNCTIONING ITEM

1. Remove control valve assembly. Refer to AT-205.
2. Check the following items:

I

Torque converter clutch control valve

I

Pilot valve

I

Pilot filter

OK or NG

OK

©

GO TO 4.

NG

©

Repair or replace damaged parts.

GI

MA

EM

LC

EC

FE

CL

MT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSES FOR SYMPTOMS

16. A/T Does Not Hold Lock-up Condition

AT-179

4

CHECK SYMPTOM

Check again.

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.

5

DETECT MALFUNCTIONING ITEM

1. Remove control valve assembly. Refer to AT-205.
2. Check the following items:

I

Torque converter clutch control valve

I

Pilot valve

I

Pilot filter

3. Disassemble A/T.
4. Check torque converter and oil pump assembly.

OK or NG

OK

©

GO TO 4.

NG

©

Repair or replace damaged parts.

TROUBLE DIAGNOSES FOR SYMPTOMS

16. A/T Does Not Hold Lock-up Condition (Cont’d)

AT-180

17. Lock-up Is Not Released

=NMAT0086

SYMPTOM:
Lock-up is not released when accelerator pedal is released.

1

CHECK THROTTLE POSITION SWITCH CIRCUIT

With CONSULT-II

Does “TCM INPUT SIGNALS” in Data Monitor show damage to closed throttle position switch circuit?

Without CONSULT-II

Does self-diagnosis show damage to closed throttle position switch circuit?

SAT146BA

Yes or No

Yes

©

Check closed throttle position switch circuit. Refer to AT-189.

No

©

GO TO 2.

2

CHECK SYMPTOM

Check again.

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 DIAGNOSES FOR SYMPTOMS

17. Lock-up Is Not Released

AT-181

18. Engine Speed Does Not Return To Idle
(Light Braking D

4

D

3

)

=NMAT0087

SYMPTOM:

I

Engine speed does not smoothly return to idle when A/T
shifts from D

4

to D

3

.

I

Vehicle does not decelerate by engine brake when turning
overdrive control switch OFF.

I

Vehicle does not decelerate by engine brake when shifting
A/T from “D” to “2” position.

1

CHECK SELF-DIAGNOSTIC RESULTS

Does self-diagnosis show damage to overrun clutch solenoid valve circuit after cruise test?

SAT836H

Yes or No

Yes

©

Check overrun clutch solenoid valve circuit. Refer to AT-116.

No

©

GO TO 2.

2

CHECK THROTTLE POSITION SENSOR

Check throttle position sensor. Refer to EC-141, “Component Description”.

SAT414K

OK or NG

OK

©

GO TO 3.

NG

©

Repair or replace throttle position sensor.

TROUBLE DIAGNOSES FOR SYMPTOMS

18. Engine Speed Does Not Return To Idle (Light Braking D

4

D

3

)

AT-182

3

CHECK A/T FLUID CONDITION

1. Remove oil pan.
2. Check A/T fluid condition.

SAT171B

OK or NG

OK

©

GO TO 4.

NG

©

GO TO 6.

4

DETECT MALFUNCTIONING ITEM

1. Remove control valve assembly. Refer to AT-205.
2. Check the following items:

I

Overrun clutch control valve

I

Overrun clutch reducing valve

I

Overrun clutch solenoid valve

OK or NG

OK

©

GO TO 5.

NG

©

Repair or replace damaged parts.

5

CHECK SYMPTOM

Check again.

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.

6

DETECT MALFUNCTIONING ITEM

1. Remove control valve assembly. Refer to AT-205.
2. Check the following items:

I

Overrun clutch control valve

I

Overrun clutch reducing valve

I

Overrun clutch solenoid valve

3. Disassemble A/T.
4. Check the following items:

I

Overrun clutch assembly

I

Oil pump assembly

OK or NG

OK

©

GO TO 5.

NG

©

Repair or replace damaged parts.

GI

MA

EM

LC

EC

FE

CL

MT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSES FOR SYMPTOMS

18. Engine Speed Does Not Return To Idle (Light Braking D

4

D

3

) (Cont’d)

AT-183

19. Vehicle Does Not Start From D

1

=NMAT0088

SYMPTOM:
Vehicle does not start from D

1

on Cruise test — Part 2.

1

CHECK SELF-DIAGNOSTIC RESULTS

Does self-diagnosis show damage to vehicle speed sensor·A/T (revolution sensor), shift solenoid valve A, B or vehicle
speed sensor·MTR after cruise test?

SAT832H

Yes or No

Yes

©

Check damaged circuit. Refer to AT-89, AT-95, AT-106 or AT-111.

No

©

GO TO 2.

2

CHECK SYMPTOM

Check again.

OK or NG

OK

©

Go to “11. Vehicle Cannot Be Started From D

1

”, AT-165.

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 DIAGNOSES FOR SYMPTOMS

19. Vehicle Does Not Start From D

1

AT-184

20. A/T Does Not Shift: D

4

D

3

, When

Overdrive Control Switch “ON”

“OFF”

=NMAT0089

SYMPTOM:
A/T does not shift from D

4

to D

3

when changing overdrive

control switch to “OFF” position.

1

CHECK OVERDRIVE CONTROL SWITCH CIRCUIT

With CONSULT-II

Does “TCM INPUT SIGNALS” in Data Monitor show damage to overdrive control switch circuit?

Without CONSULT-II

Does self-diagnosis show damage to overdrive control switch circuit?

SAT146BA

Yes or No

Yes

©

Check overdrive control switch circuit. Refer to AT-189.

No

©

Go to “13. A/T Does Not Shift: D

2

,

D

3

”, AT-171.

GI

MA

EM

LC

EC

FE

CL

MT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSES FOR SYMPTOMS

20. A/T Does Not Shift: D

4

D

3

, When Overdrive Control Switch “ON”

“OFF”

AT-185

21. A/T Does Not Shift: D

3

2

2

, When Selector

Lever “D”

“2” Position

=NMAT0090

SYMPTOM:
A/T does not shift from D

3

to 2

2

when changing selector lever

from “D” to “2” position.

1

CHECK PNP SWITCH CIRCUIT

With CONSULT-II

Does “TCM INPUT SIGNALS” in Data Monitor show damage to PNP switch circuit?

Without CONSULT-II

Does self-diagnosis show damage to PNP switch circuit?

SAT146BA

Yes or No

Yes

©

Check PNP switch circuit. Refer to AT-189.

No

©

Go to “12. A/T Does Not Shift: D

1

,

D

2

Or Does Not Kickdown: D

4

,

D

2

”, AT-168.

TROUBLE DIAGNOSES FOR SYMPTOMS

21. A/T Does Not Shift: D

3

2

2

, When Selector Lever “D”

“2” Position

AT-186

22. A/T Does Not Shift: 2

2

1

1

, When Selector

Lever “2”

“1” Position

=NMAT0091

SYMPTOM:
A/T does not shift from 2

2

to 1

1

when changing selector lever

from “2” to “1” position.

1

CHECK PNP SWITCH CIRCUIT

With CONSULT-II

Does “TCM INPUT SIGNALS” in Data Monitor show damage to PNP switch circuit?

Without CONSULT-II

Does self-diagnosis show damage to PNP switch circuit?

SAT146BA

Yes or No

Yes

©

Check PNP switch circuit. Refer to AT-189.

No

©

GO TO 2.

2

CHECK SYMPTOM

Check again.

SAT778B

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 DIAGNOSES FOR SYMPTOMS

22. A/T Does Not Shift: 2

2

1

1

, When Selector Lever “2”

“1” Position

AT-187

23. Vehicle Does Not Decelerate By Engine
Brake

=NMAT0092

SYMPTOM:
Vehicle does not decelerate by engine brake when shifting
from 2

2

(1

2

) to 1

1

.

1

CHECK SYMPTOM

Is “6. Vehicle Does Not Creep Backward In “R” Position” OK?

Yes or No

Yes

©

Go to “18. Engine Speed Does Not Return To Idle (Light Braking D

4

,

D

3

)”, AT-182.

No

©

Go to “9. Vehicle Does Not Creep Backward In “R” Position”, AT-159.

TROUBLE DIAGNOSES FOR SYMPTOMS

23. Vehicle Does Not Decelerate By Engine Brake

AT-188

SAT338HC

24. TCM Self-diagnosis Does Not Activate (PNP,
Overdrive Control, A/T Check and TP Switches
Circuit Checks)

NMAT0204

SAT415K

SAT416K

SAT413K

DESCRIPTION

NMAT0204S01

I

PNP switch
The PNP switch assemble includes a transmission range
switch. The transmission range switch detects the selector
position and sends a signal to the TCM.

I

Overdrive control and A/T mode switch
Detects the switch position (ON or OFF) 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 throttle 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.

GI

MA

EM

LC

EC

FE

CL

MT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSES FOR SYMPTOMS

24. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control, A/T Check and TP Switches Circuit Checks)

AT-189

DIAGNOSTIC PROCEDURE

=NMAT0204S03

NOTE:
The diagnostic procedure includes inspections for the overdrive
control and throttle position switch circuits.

1

CHECK PNP 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 “P”, “R”, “N”, “D”, “2” and “1” position switches moving selector lever to each position. Check the signal of the

selector lever position is indicated properly.

SAT643J

OK or NG

OK

©

GO TO 3.

NG

©

Check the following items:

I

PNP switch
Refer to “Component Inspection”, AT-196.

I

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

I

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

I

Joint connector-2

TROUBLE DIAGNOSES FOR SYMPTOMS

24. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control, A/T Check and TP Switches Circuit Checks) (Cont’d)

AT-190

2

CHECK PNP 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 M26 terminals No. 26 (P), 27 (LG), 34 (LG/B), 35 (PU), 36 (GY) and

ground while moving selector lever through each position.

MTBL0205

SAT517J

Does battery voltage exist (B) or non-existent (0)?

Yes

©

GO TO 3.

No

©

Check the following items:

I

PNP switch
Refer to “Component Inspection”, AT-196.

I

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

I

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

I

Joint connector-2

GI

MA

EM

LC

EC

FE

CL

MT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSES FOR SYMPTOMS

24. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control, A/T Check and TP Switches Circuit Checks) (Cont’d)

AT-191

3

CHECK OVERDRIVE CONTROL SWITCH CIRCUIT

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 “OVERDRIVE SWITCH”. Check the signal of the overdrive control switch is indicated properly.

(Overdrive control switch “ON” displayed on CONSULT-II means overdrive “OFF”.)

SAT645J

Without CONSULT-II

1. Turn ignition switch to “ON” position.

(Do not start engine.)

2. Check voltage between TCM harness connector M25 terminal No. 22 (L/B) and ground when overdrive control switch is

“ON” and “OFF”.

Voltage:

Switch position “ON”:

Battery voltage

Switch position “OFF”:

1V or less

SAT531JB

OK or NG

OK (With CONSULT-II)

©

GO TO 4.

OK (Without CONSULT-
II)

©

GO TO 5.

NG

©

Check the following items:

I

Overdrive control switch
Refer to “Component Inspection”, AT-196.

I

Harness for short or open between TCM and overdrive control switch (Main harness)

I

Harness for short or open of ground circuit for overdrive control switch (Main harness)

TROUBLE DIAGNOSES FOR SYMPTOMS

24. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control, A/T Check and TP Switches Circuit Checks) (Cont’d)

AT-192

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