Content .. 4 5 6 7 ..

Nissan 240SX - Automatic Transmission (Section AT) (2000 year). Instruction - part 6

Items

Symptom

Condition

Diagnostic Item

Reference Page

NOT USED

Transmission
overheats.

ON vehicle

1. Fluid level

AT-9

2. Engine idling rpm

EC-50, “Basic Inspec-
tion”.

3. Throttle position sensor (Adjustment)

EC-50, “Basic Inspec-
tion”.

4. Line pressure test

AT-51

5. Line pressure solenoid valve

AT-136

6. Control valve assembly

AT-205

OFF vehicle

7. Oil pump

8. Reverse clutch

9. High clutch

10. Brake band

11. Forward clutch

12. Overrun clutch

13. Low & reverse brake

AT-253

14. Torque converter

AT-215

ATF shoots out
during operation.
White smoke
emitted from
exhaust pipe dur-
ing operation.

ON vehicle

1. Fluid level

AT-9

OFF vehicle

2. Reverse clutch

3. High clutch

4. Brake band

5. Forward clutch

6. Overrun clutch

7. Low & reverse brake

AT-253

Offensive smell at
fluid charging
pipe.

ON vehicle

1. Fluid level

AT-9

OFF vehicle

2. Torque converter

3. Oil pump

4. Reverse clutch

5. High clutch

6. Brake band

7. Forward clutch

8. Overrun clutch

9. Low & reverse brake

AT-253

Engine is stopped
at R, D, 2 and 1
positions.

ON vehicle

1. Fluid level

AT-9

2. Torque converter clutch solenoid valve

AT-120

3. Shift solenoid valve B

AT-111

4. Shift solenoid valve A

AT-106

5. Control valve assembly

AT-205

IDX

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

Symptom Chart (Cont’d)

AT-81

AAT475A

TCM Terminals and Reference Value

=NMAT0027

PREPARATION

NMAT0027S01

Measure voltage between each terminal and terminal 25 or 48
by following “TCM INSPECTION TABLE”.

SAT217JD

TCM HARNESS CONNECTOR TERMINAL LAYOUT

NMAT0027S02

TCM INSPECTION TABLE

NMAT0027S03

(Data are reference values.)

Terminal

No.

Wire color

Item

Condition

Judgement

standard

(Approx.)

OR/B

Line pressure
solenoid valve

When releasing accelerator pedal after warm-
ing up engine.

1.5 - 3.0V

When depressing accelerator pedal fully after
warming up engine.

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.

BR/R

Torque converter
clutch solenoid
valve

When A/T performs lock-up.

8 - 15V

When A/T does not perform lock- up.

—

5*1

L/OR

DT1

—

6*1

L/W

DT2

—

7*1

PU/W

DT3

—

G/OR

Power source

When turning ignition switch to “ON”.

Battery volt-
age

When turning ignition switch to “OFF”.

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

TCM Terminals and Reference Value

AT-82

Terminal

No.

Wire color

Item

Condition

Judgement

standard

(Approx.)

R/W

Shift solenoid
valve A

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

” or “D

”.)

Battery volt-
age

When shift solenoid valve A does not operate.
(When driving in “D

” or “D

”.)

OR/L

Shift solenoid
valve B

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

” or “D

”.)

Battery volt-
age

When shift solenoid valve B does not operate.
(When driving in “D

” or “D

”.)

POWER indicator
lamp

When setting A/T mode switch in “POWER”
position.

Battery volt-
age

When setting A/T mode switch in other posi-
tion.

R/G

—

Closed throttle
position switch
(in throttle posi-
tion switch)

When releasing accelerator pedal after warm-
ing up engine.

Battery volt-
age

When depressing accelerator pedal after
warming up engine.

Wide open
throttle position
switch
(in throttle posi-
tion switch)

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

Battery volt-
age

When releasing accelerator pedal after warm-
ing up engine.

—

G/OR

Power source

Same as No. 10

P/L

Overrun clutch
solenoid valve

When overrun clutch solenoid valve operates.

Battery volt-
age

When overrun clutch solenoid valve does not
operate.

—

L/B

Overdrive control
switch

When setting overdrive control switch in “ON”
position

Battery volt-
age

When setting overdrive control switch in
“OFF” position

—

IDX

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

TCM Terminals and Reference Value (Cont’d)

AT-83

Terminal

No.

Wire color

Item

Condition

Judgement

standard

(Approx.)

—

Ground

—

PNP switch “1”
position

When setting selector lever to “1” position.

Battery volt-
age

When setting selector lever to other positions.

PNP switch “2”
position

When setting selector lever to “2” position.

Battery volt-
age

When setting selector lever to other positions.

R/W

Power source
(Memory back-up)

When turning ignition switch to “OFF”.

Battery volt-
age

When turning ignition switch to “ON”.

Battery volt-
age

Revolution sensor
(Measure in AC
range)

When vehicle cruises at 30 km/h (19 MPH).

1V or more
Voltage rises
gradually in
response to
vehicle speed.

When vehicle parks.

30*2

G/B

—

31*2

—

LG/R

Throttle position
sensor
(Power source)

Ignition switch “ON”.

4.5 - 5.5V

Ignition switch “OFF”.

—

LG/B

PNP switch “D”
position

When setting selector lever to “D” position.

Battery volt-
age

When setting selector lever to other positions.

PNP switch “R”
position

When setting selector lever to “R” position.

Battery volt-
age

When setting selector lever to other positions.

PNP switch “N” or
“P” position

When setting selector lever to “N” or “P” posi-
tion.

Battery volt-
age

When setting selector lever to other positions.

—

L/OR

Engine speed
signal

Refer to EC-76, “ECM Inspection Table”.

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

TCM Terminals and Reference Value (Cont’d)

AT-84

Terminal

No.

Wire color

Item

Condition

Judgement

standard

(Approx.)

W/PU

Vehicle speed
sensor

When moving vehicle at 2 to 3 km/h (1 to 2
MPH) for 1 m (3 ft) or more.

Voltage varies
between less
than 1.0V and
more than
4.5V.

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

Throttle position
sensor
(Ground)

—

G/Y

A/T mode switch
“POWER“

When setting A/T mode switch in “POWER”
position.

Battery volt-
age

When setting A/T mode switch in other posi-
tion.

L/B

A/T mode switch
“SNOW”

When setting A/T mode swtich in “SNOW”
position.

Battery volt-
age

When setting A/T mode switch in other posi-
tion.

—

W/R

A/T fluid tempera-
ture sensor

When ATF temperature is 20°C (68°F).

1.5V

When ATF temperature is 80°C (176°F).

0.5V

Ground

—

*1: These terminals are connected to the ECM.
*2: These terminals are connected to the Data link connector.

IDX

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

TCM Terminals and Reference Value (Cont’d)

AT-85

Wiring Diagram — AT — MAIN

NMAT0185

TAT254

TROUBLE DIAGNOSIS FOR POWER SUPPLY

Wiring Diagram — AT — MAIN

AT-86

TCM TERMINALS AND REFERENCE VALUE

NMAT0185S01

Remarks: Specification data are reference values.

Terminal

No.

Wire color

Item

Condition

Judgement

standard

(Approx.)

G/OR

Power source

When turning ignition switch to “ON”.

Battery volt-
age

When turning ignition switch to “OFF”.

G/OR

Power source

Same as No. 10

Ground

—

R/W

Power source
(Memory back-up)

When turning ignition switch to “OFF”.

Battery volt-
age

When turning ignition switch to “ON”.

Battery volt-
age

Ground

—

Diagnostic Procedure

NMAT0257

CHECK TCM POWER SOURCE STEP 1

1. Turn ignition switch to ON position.

(Do not start engine.)

2. Check voltage between TCM harness connector M25, M26 terminal Nos. 10 (G/OR), 19 (G/OR), 28 (R/W) and ground.

SAT611J

OK or NG

GO TO 2.

GO TO 3.

IDX

TROUBLE DIAGNOSIS FOR POWER SUPPLY

Wiring Diagram — AT — MAIN (Cont’d)

AT-87

CHECK TCM POWER SOURCE STEP 2

1. Turn ignition switch to OFF position.
2. Check voltage between TCM harness connector M26 terminal No. 28 (R/W) and ground.

SAT612JE

OK or NG

GO TO 4.

GO TO 3.

DETECT MALFUNCTIONING ITEM

Check the following items:

Harness for short or open between ignition switch and TCM terminals 10, 19 and 28 (Main harness)

Ignition switch and 10A fuse [No. 12 or 28, located in the fuse block (J/B)]
Refer to EL-7, “Schematic”.

OK or NG

GO TO 4.

Repair or replace damaged parts.

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 — MAIN”, AT-86.

Continuity should exist.

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

OK or NG

INSPECTION END

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

TROUBLE DIAGNOSIS FOR POWER SUPPLY

Diagnostic Procedure (Cont’d)

AT-88

SAT338HC

Description

NMAT0034

The revolution sensor detects the revolution of the out put shaft
parking pawl lock gear and emits a pulse signal. The pulse signal
is sent to the TCM which converts it into vehicle speed.

TCM TERMINALS AND REFERENCE VALUE

NMAT0034S02

Remarks: Specification data are reference values.

Terminal

No.

Wire color

Item

Condition

Judgement

standard

(Approx.)

Revolution sensor
(Measure in AC
range)

When vehicle cruises at 30 km/h (19
MPH).

1V or more
Voltage rises
gradually in
response to
vehicle speed.

When vehicle parks.

G/Y

Throttle position
sensor
(Ground)

—

ON BOARD DIAGNOSIS LOGIC

NMAT0034S03

Diagnostic trouble code

Malfunction is detected when ...

Check item (Possible cause)

: VHCL SPEED SEN·A/T

TCM does not receive the proper voltage
signal from the sensor.

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

Revolution sensor

: 1st judgement flicker

IDX

TROUBLE DIAGNOSIS FOR VHCL SPEED SEN·A/T (REVOLUTION SENSOR)

Description

AT-89

SAT014K

SAT806H

SELF-DIAGNOSIS CODE CONFIRMATION PROCEDURE

NMAT0034S04

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

WITH CONSULT-II

NMAT0034S05

Start engine.

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

Drive vehicle under the following conditions:
Selector lever in “D” position, vehicle speed higher than 30
km/h (19 MPH), throttle opening greater than 1/8 of the full
throttle position and driving for more than 5 seconds.

WITHOUT CONSULT-II

NMAT0034S06

Start engine.

Perform self-diagnosis.
Refer

SELF-DIAGNOSTIC

PROCEDURE

(Without

CONSULT-II), AT-37.

TROUBLE DIAGNOSIS FOR VHCL SPEED SEN·A/T (REVOLUTION SENSOR)

Description (Cont’d)

AT-90

Wiring Diagram — AT — VSSA/T

NMAT0188

TAT255

IDX

TROUBLE DIAGNOSIS FOR VHCL SPEED SEN·A/T (REVOLUTION SENSOR)

Wiring Diagram — AT — VSSA/T

AT-91

Diagnostic Procedure

NMAT0035

CHECK REVOLUTION SENSOR

Refer to “Component Inspection”, AT-93.

OK or NG

OK (With CONSULT-II)

GO TO 2.

OK (Without CONSULT-
II)

GO TO 3.

Repair or replace revolution sensor.

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 “VHCL/S SE·A/T” while driving.

Check the value changes according to driving speed.

SAT614J

OK or NG

GO TO 4.

Check the following items:

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

Harness for short or open between revolution sensor and ECM (Main harness)

Ground circuit for ECM
Refer to EC-83, “Wiring Diagram”.

TROUBLE DIAGNOSIS FOR VHCL SPEED SEN·A/T (REVOLUTION SENSOR)

Diagnostic Procedure

AT-92

CHECK INPUT SIGNAL (WITHOUT CONSULT-II)

Without CONSULT-II

1. Start engine.
2. Check voltage between TCM harness connector M26 terminal No. 29 and ground while driving.

(Measure with AC range.)

Voltage:

At 0 km/h (0 MPH):

At 30 km/h (19 MPH):

1V or more

(Voltage rises gradually in response to vehicle speed.)

SAT519J

OK or NG

GO TO 4.

Check the following items:

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

Harness for short or open between revolution sensor and ECM (Main harness)

Ground circuit for ECM
Refer to EC-83, “Wiring Diagram”.

CHECK DTC

Perform Self-diagnosis Code confirmation procedure, AT-90.

OK or NG

INSPECTION END

1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-

nector.

SAT210IA

Component Inspection

NMAT0036

REVOLUTION SENSOR

NMAT0036S01

For removal, refer to AT-205.

Check resistance.

IDX

TROUBLE DIAGNOSIS FOR VHCL SPEED SEN·A/T (REVOLUTION SENSOR)

Diagnostic Procedure (Cont’d)

AT-93

Terminals

Connector

Terminal No. (Wire color)

Resistance

(Approx.)

Ω

E24

1 (W)

2 (B)

500 - 650

1 (W)

3 (Shield wire)

No continuity

2 (B)

3 (Shield wire)

TROUBLE DIAGNOSIS FOR VHCL SPEED SEN·A/T (REVOLUTION SENSOR)

Component Inspection (Cont’d)

AT-94

Description

NMAT0217

The vehicle speed sensor·MTR is built into the speedometer
assembly. The sensor functions as an auxiliary device to the revo-
lution sensor when it is malfunctioning. The TCM will then use a
signal sent from the vehicle speed sensor·MTR.

TCM TERMINALS AND REFERENCE VALUE

NMAT0217S01

Remarks: Specification data are reference values.

Terminal

No.

Wire color

Item

Condition

Judgement

standard

(Approx.)

W/PU

Vehicle speed
sensor

When moving vehicle at 2 to 3 km/h (1 to 2
MPH) for 1 m (3 ft) or more.

Voltage var-
ies between
less than 1V
and more
than 4.5V

ON BOARD DIAGNOSIS LOGIC

NMAT0217S02

Diagnostic trouble code

Malfunction is detected when ...

Check item (Possible cause)

: VHCL SPEED SEN·MTR

TCM does not receive the proper voltage
signal from the sensor.

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

Vehicle speed sensor

: 2nd judgement flicker

SAT014K

SAT807H

SELF-DIAGNOSIS CODE CONFIRMATION PROCEDURE

NMAT0217S04

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

WITH CONSULT-II

NMAT0217S05

Start engine.

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

Drive vehicle under the following conditions:
Selector lever in “D” position and vehicle speed higher than 20
km/h (12 MPH).

WITHOUT CONSULT-II

NMAT0217S06

Start engine.

Drive vehicle under the following conditions:
Selector lever in “D” position and vehicle speed higher than 20
km/h (12 MPH).

Perform self-diagnosis.
Refer

SELF-DIAGNOSTIC

PROCEDURE

(Without

CONSULT-II), AT-37.

IDX

TROUBLE DIAGNOSIS FOR VHCL SPEED SEN·MTR

Description

AT-95

Wiring Diagram — AT — VSSMTR

NMAT0218

TAT256

TROUBLE DIAGNOSIS FOR VHCL SPEED SEN·MTR

Wiring Diagram — AT — VSSMTR

AT-96

Content .. 4 5 6 7 ..