Nissan Silvia. Instruction — part 48

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