Infiniti FX35, FX50 (S51). Manual - part 1864

P0730 INCORRECT GEAR RATIO

TM-263

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B (VK50VE)]

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P0730 INCORRECT GEAR RATIO

Description

INFOID:0000000005250245

• TCM detects a high-rpm state of the under drive sun gear.
• The number of revolutions of the under drive sun gear is calculated with the input speed sensor 1 and 2.

DTC Logic

INFOID:0000000005250246

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

• “

TM-263, "Diagnosis Procedure"

” must be performed before starting “DTC CONFIRMATION PROCE-

DURE”.

• Never perform “DTC CONFIRMATION PROCEDURE” before completing the repair, which may cause

secondary malfunction.

• Always drive vehicle at a safe speed.

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

CHECK DTC DETECTION

 With CONSULT-III

1.

Start the engine.

2.

Select “Self Diagnostic Results” in “ENGINE”.

3.

Drive vehicle under the similar conditions to (1st trip) Freeze Frame Data for 10 minutes. Refer to the
table below.
Hold the accelerator pedal as steady as possible.

 With GST

Follow the procedure “With CONSULT-III”.
Is “P0730” detected?

YES

>> Go to 

TM-263, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005250247

1.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace A/T assembly. Refer to 

TM-362, "Exploded View"

.

NO

>> Repair or replace damaged parts.

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P0730

Incorrect Gear Ratio

The revolution of under drive 
sun gear is 8,000 rpm or more. 
NOTE:
Not detected when in “P” or “N” 
position and during a shift to “P” 
or “N” position.

• 2346 brake solenoid valve
• Front brake solenoid valve
• Input speed sensor 1, 2

ENGINE SPEED

Same value as the Freeze Frame Data.

VEHICLE SPEED

Same value as the Freeze Frame Data.

B/FUEL SCHDL

Same value as the Freeze Frame Data.

TM-264

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B (VK50VE)]

P0731 1GR INCORRECT RATIO

P0731 1GR INCORRECT RATIO

Description

INFOID:0000000005250248

This malfunction is detected when the A/T does not shift into 1GR position as instructed by TCM. This is not
only caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction such as control
valve sticking, improper solenoid valve operation, etc.

DTC Logic

INFOID:0000000005250249

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

• “

TM-265, "Diagnosis Procedure"

” must be performed before starting “DTC CONFIRMATION PROCE-

DURE”.

• Never perform “DTC CONFIRMATION PROCEDURE” before completing the repair, which may cause

secondary malfunction.

• Always drive vehicle at a safe speed.

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

CHECK ATF TEMPERATURE

 With CONSULT-III

1.

Start the engine.

2.

Select “ATF TEMP 1” in “Data Monitor” in “TRANSMISSION”.

3.

Check ATF temperature is in the following range.

 With GST

1.

Start the engine.

2.

Drive vehicle for approximately 5 minutes in urban areas.

Is ATF temperature within specified range?

YES

>> GO TO 3.

NO

>> Drive vehicle to warm ATF or stop engine to cool ATF.

3.

CHECK SYMPTOM (PART 1)

 With CONSULT-III

1.

Select “1ST GR FNCTN P0731” in “DTC & SRT confirmation” in “TRANSMISSION”.

2.

Drive vehicle with manual mode and maintain the following conditions.

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P0731

Gear 1 Incorrect Ratio

The gear ratio is:
• 5.180 or more
• 4.594 or less

• Input clutch solenoid valve
• Direct clutch solenoid valve
• High and low reverse clutch 

solenoid valve

• Front brake solenoid valve
• Low brake solenoid valve
• 2346 brake solenoid valve
• Anti-interlock solenoid valve
• Each clutch and brake
• Output speed sensor
• Input speed sensor 1, 2
• Hydraulic control circuit

ATF TEMP 1

: 20

°

C (68

°

F) – 140

°

C (284

°

F)

P0731 1GR INCORRECT RATIO

TM-265

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B (VK50VE)]

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3.

Keep the current driving status for 2 seconds or more if CONSULT-III screen changes from “OUT OF
CONDITION” to “TESTING”.

CAUTION:

When “TESTING” is not detected on CONSULT-III for a long time, check “Self Diagnostic Results”
in “TRANSMISSION”. When a DTC other than “P0731” is detected, check the DTC. Refer to 

TM-

332, "DTC Index"

.

 With GST

1.

Drive vehicle and maintain the following conditions for 2 seconds or more.

2.

Check DTC.

Is  “OUT OF CONDITION”,  “STOP VEHICLE” or “COMPLETED RESULT NG” displayed? / Is “P0731”
detected?

YES-1 >> “OUT OF CONDITION”: Perform “Step 3” again.
YES-2 >> “STOP VEHICLE”: GO TO 4.
YES-3 >> “COMPLETED RESULT NG”: Go to 

TM-265, "Diagnosis Procedure"

.

YES-4 >> “P0731” is detected: Go to 

TM-265, "Diagnosis Procedure"

.

NO

>> GO TO 4.

4.

CHECK SYMPTOM (PART 2)

1.

Stop vehicle.

2.

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

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005250250

1.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace A/T assembly. Refer to 

TM-362, "Exploded View"

.

NO

>> Repair or replace damaged parts.

GEAR

: 1st

ACCELE POSI

: 0.7/8 or more

VEHICLE SPEED

: 10 km/h (7 MPH) or more

Selector lever

: “M” position

Gear position

: 1st

Accelerator pedal opening

: 0.7/8 or more

Vehicle speed

: 10 km/h (7 MPH) or more

TM-266

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B (VK50VE)]

P0732 2GR INCORRECT RATIO

P0732 2GR INCORRECT RATIO

Description

INFOID:0000000005250251

This malfunction is detected when the A/T does not shift into 2GR position as instructed by TCM. This is not
only caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction such as control
valve sticking, improper solenoid valve operation, etc.

DTC Logic

INFOID:0000000005250252

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

• “

TM-267, "Diagnosis Procedure"

” must be performed before starting “DTC CONFIRMATION PROCE-

DURE”.

• Never perform “DTC CONFIRMATION PROCEDURE” before completing the repair, which may cause

secondary malfunction.

• Always drive vehicle at a safe speed.

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

CHECK ATF TEMPERATURE

 With CONSULT-III

1.

Start the engine.

2.

Select “ATF TEMP 1” in “Data Monitor” in “TRANSMISSION”.

3.

Check ATF temperature is in the following range.

 With GST

1.

Start the engine.

2.

Drive vehicle for approximately 5 minutes in urban areas.

Is ATF temperature within specified range?

YES

>> GO TO 3.

NO

>> Drive vehicle to warm ATF or stop engine to cool ATF.

3.

CHECK SYMPTOM (PART 1)

 With CONSULT-III

1.

Select “2ND GR FNCTN P0732” ins “DTC & SRT confirmation” in “TRANSMISSION”.

2.

Drive vehicle with manual mode and maintain the following conditions.

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P0732

Gear 2 Incorrect Ratio

The gear ratio is:
• 3.360 or more
• 2.980 or less

• Input clutch solenoid valve
• Direct clutch solenoid valve
• High and low reverse clutch 

solenoid valve

• Front brake solenoid valve
• Low brake solenoid valve
• 2346 brake solenoid valve
• Anti-interlock solenoid valve
• Each clutch and brake
• Output speed sensor
• Input speed sensor 1, 2
• Hydraulic control circuit

ATF TEMP 1

: 20

°

C (68

°

F) – 140

°

C (284

°

F)