Infiniti QX56 (JA60). Manual - part 940

TM-62

< COMPONENT DIAGNOSIS >

P0734 4GR INCORRECT RATIO

Diagnosis Procedure

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1.

CHECK CAN COMMUNICATION LINE

Perform self-diagnosis. Refer to 

TM-32, "CONSULT-III Function (TRANSMISSION)"

.

Is a malfunction in the CAN communication indicated in the results?

YES

>> Check CAN communication line. Refer to 

TM-40, "Diagnosis Procedure"

.

NO

>> GO TO 2.

2.

CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to 

TM-94, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3.

DETECT MALFUNCTION ITEM

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

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

4.

REPLACE CONTROL VALVE WITH TCM

1. Replace control valve with TCM. Refer to 

TM-172, "Control Valve with TCM and A/T Fluid Temperature

Sensor 2 and Plug"

.

2. Perform 

TM-61, "DTC Confirmation Procedure"

.

OK or NG

OK

>> INSPECTION END

NG

>> Confirm malfunction phenomena by “ROAD TEST” to repair malfunctioning part. Refer to 

TM-159,

"Description"

.

P0735 5GR INCORRECT RATIO

TM-63

< COMPONENT DIAGNOSIS >

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P0735 5GR INCORRECT RATIO

Description

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This malfunction is detected when the A/T does not shift into 5GR position as instructed by TCM. This is not

only caused by electrical malfunction (circuits open or shorted) but also by mechanical malfunction such as

control valve sticking, improper solenoid valve operation.

On Board Diagnosis Logic

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• This is an OBD-II self-diagnostic item.

• Diagnostic trouble code “P0735 5GR INCORRECT RATIO” is detected when TCM detects any inconsis-

tency in the actual gear ratio.

Possible Cause

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• Harness or connectors 

(Solenoid circuits are open or shorted.)

• Input clutch solenoid valve

• Front brake solenoid valve

• Direct clutch solenoid valve

• High and low reverse clutch solenoid valve

• Each clutch

• Hydraulic control circuit

DTC Confirmation Procedure

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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-III

1. Start the engine and select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.

2. Make sure that “ATF TEMP 1” is within the following range.

ATF TEMP 1: 20

°C – 140°C

If out of range, drive vehicle to warm ATF or stop engine to cool ATF.

3. Select “5TH GR FNCTN P0735” of “DTC WORK SUPPORT” mode for “TRANSMISSION” with CON-

SULT-III.

4. Drive vehicle and maintain the following conditions.

VEHICLE SPEED: 10 km/h (6 MPH) or more

ACCELE POSI: 0.6/8 or more

ENGINE SPEED: INPUT SPEED 

− 50 rpm or more

INPUT SPEED: 300 rpm or more

GEAR: “5” position

MANU MODE SW: ON

5. Keep the current driving status for at least 5 consecutive seconds if CONSULT-III screen changes from

“OUT OF CONDITION” to “TESTING”.

CAUTION:

If “TESTING” does not appear on CONSULT-III for a long time, select “SELF-DIAG RESULTS”. In

case a 1st trip DTC other than P0735 is shown, refer to “

TM-119, "DTC No. Index"

”.

If “COMPLETED RESULT NG” is detected, go to 

TM-64, "Diagnosis Procedure"

.

If “STOP VEHICLE” is detected, go to the following step.

6. Stop vehicle.

7. Drive vehicle in “D” position allowing it to shift from 1GR to 5GR and check shift timing and shift shock.

-

Touch “OK” to complete the inspection when normally shifted from the 1GR to 5GR.

-

Touch “NG” when an unusual shift shock, etc. occurs in spite of shifting from the 1GR to 5GR. Go to 

TM-

159, "Description"

.

-

Perform 

TM-32, "CONSULT-III Function (TRANSMISSION)"

 when not shifted from the 1GR to 5GR. (Nei-

ther “OK” nor “NG” are indicated.)

TM-64

< COMPONENT DIAGNOSIS >

P0735 5GR INCORRECT RATIO

Diagnosis Procedure

INFOID:0000000005148592

1.

CHECK CAN COMMUNICATION LINE

Perform self-diagnosis. Refer to 

TM-32, "CONSULT-III Function (TRANSMISSION)"

.

Is a malfunction in the CAN communication indicated in the results?

YES

>> Check CAN communication line. Refer to 

TM-40, "Diagnosis Procedure"

.

NO

>> GO TO 2.

2.

CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to 

TM-94, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3.

DETECT MALFUNCTION ITEM

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

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

4.

REPLACE CONTROL VALVE WITH TCM

1. Replace control valve with TCM. Refer to 

TM-172, "Control Valve with TCM and A/T Fluid Temperature

Sensor 2 and Plug"

.

2. Perform 

TM-63, "DTC Confirmation Procedure"

.

OK or NG

OK

>> INSPECTION END

NG

>> Confirm malfunction phenomena by “ROAD TEST” to repair malfunctioning part. Refer to 

TM-159,

"Description"

.

P0740 TORQUE CONVERTER

TM-65

< COMPONENT DIAGNOSIS >

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P0740 TORQUE CONVERTER

Description

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• The torque converter clutch solenoid valve is activated, with the gear in D

4

, D

5

 by the TCM in response to

signals sent from the output speed sensor and accelerator pedal position sensor. Torque converter clutch

piston operation will then be controlled.

• Lock-up operation, however, is prohibited when A/T fluid temperature is too low.

• When the accelerator pedal is depressed (less than 1/8) in lock-up condition, the engine speed should not

change abruptly. If there is a big jump in engine speed, there is no lock-up.

CONSULT-III Reference Value in Data Monitor Mode

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On Board Diagnosis Logic

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• This is an OBD-II self-diagnostic item.

• Diagnostic trouble code “P0740 TORQUE CONVERTER” with CONSULT-III 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

INFOID:0000000005148596

• Torque converter clutch solenoid valve

• Harness or connectors

(The solenoid circuit is open or shorted.)

DTC Confirmation Procedure

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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-III

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

2. Select “DATA MONITOR” mode for “ENGINE” with CONSULT-III.

3. Start engine and maintain the following conditions for at least 5 consecutive seconds.

VHCL/S SE-A/T: 80 km/h (50 MPH) or more

ACCELE POSI: 0.5/8 - 1.0/8

SLCT LVR POSI: “D” position 

Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving

conditions required for this test.

4. If DTC is detected go to 

TM-65, "Diagnosis Procedure"

.

 WITH GST

Follow the procedure “With CONSULT-III”.

Diagnosis Procedure

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1.

CHECK INPUT SIGNAL

With CONSULT-III

1. Turn ignition switch “ON”. 

2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.

Item name 

Condition 

Display value (Approx.)

TCC SOLENOID

When performing slip lock-up.

0.2 - 0.4 A

When performing lock-up.

0.4 - 0.6 A