Infiniti F50. Manual — part 71

DTC P1731 A/T 1ST ENGINE BRAKING

AT-169

D

E

F

G

H

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K

L

M

A

B

AT

3.

CHECK TERMINAL CORD ASSEMBLY

1.

Remove oil pan. Refer to

AT-289, "Control Valve Assembly"

.

2.

Disconnect A/T unit assembly harness connector and control valve assembly harness connector.

3.

Check continuity between A/T unit assembly harness connector
and control valve assembly harness connector.

4.

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

5.

Reinstall any part removed.

OK or NG

OK

>> Replace the control valve assembly. Refer to

AT-289, "Control Valve Assembly"

.

NG

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

4.

CHECK DTC

Perform “DTC Confirmation Procedure”. Refer to

AT-166, "DTC Confirmation Procedure"

.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 5.

5.

PERFORM TCM INSPECTION

1.

Perform TCM input/output signal inspection.

2.

If NG, recheck TCM pin terminals for damage or loose connection with harness connector.

OK or NG

OK

>> INSPECTION END

NG

>> Repair or replace damaged parts.

Item

Connector No.

Terminal No. (Wire color)

Continuity

A/T unit assembly
harness connector

F26

2 (R)

Yes

Control valve assem-
bly harness connec-
tor

F302

10 (R)

A/T unit assembly
harness connector

F26

5 (L)

Yes

Control valve assem-
bly harness connec-
tor

F302

13 (L)

A/T unit assembly
harness connector

F27

2 (B/R)

Yes

Control valve assem-
bly harness connec-
tor

F301

4 (B/R)

SCIA3107E

AT-170

DTC P1752 INPUT CLUTCH SOLENOID VALVE

DTC P1752 INPUT CLUTCH SOLENOID VALVE

PFP:31940

Description

ECS0086K

Input clutch solenoid valve is controlled by the TCM in response to signals sent from the PNP switch, vehicle
speed sensor and accelerator pedal position sensor (throttle position sensor). Gears will then be shifted to the
optimum position.

On Board Diagnosis Logic

ECS0086L

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “I/C SOLENOID/CIRC” with CONSULT-II or P1752 without CONSULT-II is
detected under the following conditions.

–

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

–

When TCM detects as irregular by comparing target value with monitor value.

Possible Cause

ECS0086M

●

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

●

Input clutch solenoid valve

DTC Confirmation Procedure

ECS0086N

CAUTION:

Always drive vehicle at a safe speed.

NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF”
and wait at least 10 seconds before conducting the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-II

1.

Turn ignition switch to “ON” position. (Do not start engine.)

2.

Select “DATA MONITOR” mode for “A/T” with CONSULT-II.

3.

Start engine.

4.

Maintain the following conditions for at least 5 consecutive sec-
onds.
ACCELE POS: 1.5/8 - 2.0/8
Selector lever: “D” position
Gear position: 3rd

Þ

4th Gear (I/C ON/OFF)

5.

If DTC is detected go to “

AT-172, "Diagnostic Procedure"

.

WITH GST

Follow the procedure “With CONSULT-II”.

SAT014K

DTC P1752 INPUT CLUTCH SOLENOID VALVE

AT-171

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Wiring Diagram — AT — I/C

ECS0086O

TCM terminal and data are reference value. Measured between each terminal and ground.

TCWM0017E

Terminal

No.

Wire

color

Item

Condition

Data (Approx.)

10

R/W

Input clutch sole-
noid valve

When

vehicle
cruises

When the solenoid valve operating (in 1st gear, 2nd gear,
or 3rd gear)

More than 2V

When the solenoid valve is not operating (4th gear or 5th
gear)

0V

AT-172

DTC P1752 INPUT CLUTCH SOLENOID VALVE

Diagnostic Procedure

ECS0086P

1.

CHECK INPUT CLUTCH SOLENOID VALVE CIRCUIT

1.

Turn ignition switch to “OFF” position.

2.

Disconnect A/T unit assembly harness connector at the trans-
mission right side.

3.

Check the resistance between terminal and ground.

OK or NG

OK >> GO

TO

4.

NG

>> GO TO 2.

2.

CHECK TERMINAL CORD ASSEMBLY

1.

Remove oil pan. Refer to

AT-289, "Control Valve Assembly"

.

2.

Disconnect A/T unit assembly harness connector and control valve assembly harness connector.

3.

Check continuity between A/T unit assembly harness connector
and control valve assembly harness connector.

4.

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

OK or NG

OK

>> GO TO 3.

NG

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

3.

CHECK VALVE RESISTANCE

Check valve resistance

●

Refer to

AT-174, "Component Inspection"

.

OK or NG

OK >> GO

TO

4.

NG

>> Replace the control valve assembly. Refer to

AT-289, "Control Valve Assembly"

.

Solenoid valve

Connector

No.

Terminal No.

(Wire color)

Resistance (Approx.)

Input clutch solenoid
valve

F27

6 (R/W) - Ground

3 - 9

Ω

SCIA1837E

Item

Connector No.

Terminal No. (Wire color)

Continuity

A/T unit assembly
harness connector

F27

6 (R/W)

Yes

Control valve assem-
bly harness connec-
tor

F301

9 (R/W)

SCIA3073E