Infiniti F50. Manual — part 73

DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION

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Diagnostic Procedure

ECS00A32

1.

CHECK INPUT SIGNALS

With CONSULT-II

1.

Start engine.

2.

Select “ECU INPUT SIGNALS” or “MAIN SIGNALS” in “DATA
MONITOR” mode for “A/T” with CONSULT-II.

3.

Accelerate vehicle in the “D” position (3rd

Þ

4th gear), and con-

firm the ON/OFF actuation of the “ATF PRES SW 3”.

With GST

Follow the procedure “With CONSULT-II”.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 2.

2.

CHECK HARNESS BETWEEN TCM AND A/T UNIT ASSEMBLY HARNESS CONNECTOR

1.

Turn ignition switch to “OFF” position.

2.

Disconnect TCM connector.

3.

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

4.

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

5.

Reinstall any part removed.

OK or NG

OK

>> GO TO 3.

NG

>> Repair open circuit or short to ground or short to power

in harness or connectors.

PCIA0067E

Item

Connector No.

Terminal No.

(Wire color)

Continuity

TCM

F103

4 (P/L)

Yes

A/T unit assembly harness
connector

F26

7 (P/L)

TCM

F103

10 (R/W)

Yes

A/T unit assembly harness
connector

F27

6 (R/W)

TCM

F104

40 (Y/G)

Yes

A/T unit assembly harness
connector

F26

2 (Y/G)

SCIA3109E

AT-178

DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION

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

7 (W)

Yes

Control valve assem-
bly harness connec-
tor

F302

15 (W)

A/T unit assembly
harness connector

F27

6 (R/W)

Yes

Control valve assem-
bly harness connec-
tor

F301

9 (R/W)

SCIA3075E

DTC P1757 FRONT BRAKE SOLENOID VALVE

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DTC P1757 FRONT BRAKE SOLENOID VALVE

PFP:31940

Description

ECS0086W

Front brake 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

ECS0086X

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “FR/B SOLENOID/CIRC” with CONSULT-II or P1757 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

ECS0086Y

●

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

●

Front brake solenoid valve

DTC Confirmation Procedure

ECS0086Z

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 (FR/B ON/OFF)

5.

If DTC is detected go to

AT-181, "Diagnostic Procedure"

.

WITH GST

Follow the procedure “With CONSULT-II”.

SAT014K

AT-180

DTC P1757 FRONT BRAKE SOLENOID VALVE

Wiring Diagram — AT — FR/B

ECS00870

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

TCWM0019E

Terminal

No.

Wire

color

Item

Condition

Data (Approx.)

19

R

Front brake sole-
noid valve

When

vehicle

starts

When the solenoid valve is operating (other than 4th gear)

More than 2V

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

0V