Infiniti F50. Manual - part 78

DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE

AT-197

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DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE

PFP:31940

Description

ECS0087K

High & low reverse 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

ECS0087L

●

This is an OBD-II self-diagnostic item.

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Diagnostic trouble code “HLR/C SOL/CIRC” with CONSULT-II or P1767 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

ECS0087M

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

●

High & low reverse clutch solenoid valve 

DTC Confirmation Procedure

ECS0087N

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: 2nd 

Þ

 3rd Gear (HLR/C ON/OFF)

5.

If DTC is detected, go to 

AT-199, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “With CONSULT-II”.

SAT014K

AT-198

DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE

Wiring Diagram — AT — HLR/C

ECS0087O

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

TCWM0023E

Terminal   

No.

Wire 

color

Item

Condition

Data (Approx.)

11

R/L

High & low 
reverse clutch 
solenoid valve

When 

vehicle 
cruises

When the solenoid valve operating [6 km/h (4 MPH) or 
faster in 1st gear or 2nd gear]

More than 2V 

When the solenoid valve is not operating [6 km/h (4 MPH) 
or slower in 1st gear or 3rd, 4th, or 5th gear]

0V

DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE

AT-199

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Diagnostic Procedure

ECS0087P

1. 

CHECK HIGH AND LOW REVERSE 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-201, "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.)

High and low reverse 
clutch solenoid valve

F27

3 (R/L) - Ground

 3 - 9 

Ω

SCIA1843E

Item

Connector No.

Terminal No. (Wire color)

Continuity

A/T unit assembly 
harness connector

F27

3 (B/W)

Yes

Control valve assem-
bly harness connec-
tor

F301

5 (B/W)

SCIA3087E

AT-200

DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE

4. 

CHECK POWER SOURCE CIRCUIT

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 5.

NG

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

5. 

CHECK DTC

Perform “DTC Confirmation Procedure”. Refer to 

AT-197, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 6.

6. 

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

TCM

F103

11 (R/L)

Yes

A/T unit assembly harness 
connector

F27

3 (R/L)

SCIA1844E