Infiniti G35 (V35). Manual - part 41

DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE FUNCTION

AT-155

D

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B

AT

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Diagnostic Procedure

NCS000GF

1. 

CHECK INPUT SIGNALS

 With CONSULT-II

1.

Start the engine.

2.

Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “A/T” with CONSULT-II.

3.

Drive vehicle in the “D” position (2nd 

Þ

 3rd gear), and confirm

the ON/OFF actuation of the “ATF PRES SW 6” and electrical
current value of “HLR/C SOL”.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 2.

2. 

CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to 

AT-172, "MAIN POWER SUPPLY AND GROUND CIR-

CUIT"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3. 

DETECT MALFUNCTIONING ITEM

Check A/T assembly harness connector pin terminals for damage or loose connection with harness connector.

OK or NG

OK

>> Replace control valve with TCM. Refer to 

AT-225, "Control Valve with TCM and A/T Fluid Temper-

ature Sensor 2"

 .

NG

>> Repair or replace damaged parts.

4. 

CHECK DTC

Perform 

AT-154, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

Item name

Condition 

Display value 
(Approx.)

HLR/C SOL

High and low reverse clutch disengaged. 
Refer to 

AT-19

 .

0.6 - 0.8 A

High and low reverse clutch engaged. 
Refer to 

AT-19

 .

0 - 0.05 A

ATF PRES SW 6

High and low reverse clutch engaged. 
Refer to 

AT-19

 .

ON

High and low reverse clutch disengaged. 
Refer to 

AT-19

 .

OFF

SCIA4798E

AT-156

DTC P1772 LOW COAST BRAKE SOLENOID VALVE

DTC P1772 LOW COAST BRAKE SOLENOID VALVE

PFP:31940

Description

NCS000GG

Low coast brake solenoid valve is turned ON or OFF 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.

CONSULT-II Reference Value

NCS000GH

On Board Diagnosis Logic

NCS000GI

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “P1772 LC/B SOLENOID/CIRC” with CONSULT-II or 7th judgment flicker without
CONSULT-II is detected when TCM detects an improper voltage drop when it tries to operate the solenoid
valve.

Possible Cause

NCS000GJ

●

Harness or connectors.
(Solenoid circuit is open or shorted.)

●

Low coast brake solenoid valve.

DTC Confirmation Procedure

NCS000GK

CAUTION:

Always drive vehicle at a safe speed.

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

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “A/T” with CONSULT-II and check monitor “MANU MODE
SW” and “GEAR”.

3.

Touch “START”.

4.

Start engine.

5.

Drive vehicle and maintain the following conditions for at least 5
consecutive seconds.
MANU MODE SW: ON
GEAR: “1” or “2” (LC/B ON/OFF)

6.

If DTC is detected, go to 

AT-157, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Item name

Condition 

Display value 

ON OFF SOL

Low coast brake engaged. Refer to 

AT-19

 

.

ON

Low coast brake disengaged. Refer to 

AT-19

 

.

OFF

BCIA0031E

DTC P1772 LOW COAST BRAKE SOLENOID VALVE

AT-157

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Diagnostic Procedure

NCS000GL

1. 

CHECK INPUT SIGNAL

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “A/T” with CONSULT-II.

3.

Start the engine.

4.

Read out the value of “ON OFF SOL” while driving.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 2.

2. 

CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to 

AT-172, "MAIN POWER SUPPLY AND GROUND CIR-

CUIT"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3. 

DETECT MALFUNCTIONING ITEM

Check A/T assembly harness connector pin terminals for damage or loose connection with harness connector.

OK or NG

OK

>> Replace control valve with TCM. Refer to 

AT-225, "Control Valve with TCM and A/T Fluid Temper-

ature Sensor 2"

 .

NG

>> Repair or replace damaged parts.

4. 

CHECK DTC

Perform 

AT-156, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

Item name

Condition 

Display value 

ON OFF SOL

Low coast brake engaged. Refer to 

AT-19

 

.

ON

Low coast brake disengaged. Refer to 

AT-19

 

.

OFF

SCIA4794E

AT-158

DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION

DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION

PFP:31940

Description

NCS000GM

●

Low coast brake solenoid valve is turned ON or OFF 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.

●

This is not only caused by electrical malfunction (circuits open or shorted) but also by mechanical mal-
function such as control valve sticking, improper solenoid valve operation.

CONSULT-II Reference Value

NCS000GN

On Board Diagnosis Logic

NCS000GO

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “P1774 LC/B SOLENOID FNCT” with CONSULT-II or 7th judgment flicker without
CONSULT-II is detected under the following conditions.

–

When TCM detects that actual gear ratio is irregular, and relation between gear position and condition of
ATF pressure switch 2 is irregular during depressing accelerator pedal. (Other than during shift change)

–

When TCM detects that relation between gear position and condition of ATF pressure switch 2 is irregular
during releasing accelerator pedal. (Other than during shift change)

Possible Cause

NCS000GP

●

Harness or connectors.
(Solenoid and switch circuits are open or shorted.)

●

Low coast brake solenoid valve.

●

ATF pressure switch 2.

DTC Confirmation Procedure

NCS000GQ

CAUTION:

Always drive vehicle at a safe speed.

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

 WITH CONSULT-II

1.

Start engine.

2.

Accelerate vehicle to maintain the following conditions.
MANU MODE SW: ON
GEAR: “1” or “2” (LC/B ON/OFF)

3.

Perform step “2” again.

4.

Turn ignition switch OFF, then perform step “1” to “3” again.

5.

Check “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-
II. If DTC (P1774) is detected, refer to 

AT-159, "Diagnostic Pro-

cedure"

 .

If DTC (P1772) is detected, go to 

AT-157, "Diagnostic Proce-

dure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Item name

Condition 

Display value

ON OFF SOL

Low coast brake engaged. Refer to 

AT-19

 

.

ON

Low coast brake disengaged. Refer to 

AT-19

 

.

OFF

ATF PRES SW 2

Low coast brake engaged. Refer to 

AT-19

 

.

ON

Low coast brake disengaged. Refer to 

AT-19

 

.

OFF

BCIA0031E