Infiniti FX35, FX50 (S51). Manual - part 1825

P1730 INTERLOCK

TM-107

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01A (VQ35HR)]

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P1730 INTERLOCK

Description

INFOID:0000000005250093

Fail-safe function to detect interlock conditions.

DTC Logic

INFOID:0000000005250094

DTC DETECTION LOGIC

NOTE:
When the vehicle is driven fixed in second gear, a input speed sensor malfunction is displayed, but
this is not a input speed sensor malfunction.

DTC CONFIRMATION PROCEDURE

CAUTION:

• “

TM-108, "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 “SLCT LVR POSI” and “GEAR” in “Data Monitor” in “TRANSMISSION”.

3.

Drive vehicle the following condition.

4.

Perform “Self Diagnostic Results” in “TRANSMISSION”.

 With GST

Follow the procedure “With CONSULT-III”.

Is “P1730” detected?

YES

>> Go to 

TM-108, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Judgment of A/T Interlock

INFOID:0000000005250095

Refer to 

TM-146, "Fail-Safe"

.

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P1730

Interlock

The output speed sensor de-
tects the deceleration of 12 km/
h (7 MPH) or more for 1 sec-
ond.

• Harness or connectors

(Solenoid valve circuit is open 
or shorted.)

• 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
• Hydraulic control circuit

SLCT LVR POSI

: D

GEAR

: 1st through 7th

TM-108

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01A (VQ35HR)]

P1730 INTERLOCK

Diagnosis Procedure

INFOID:0000000005250096

1.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace A/T assembly. Refer to 

TM-181, "2WD : Exploded View"

 (2WD), 

TM-184, "AWD :

Exploded View"

 (AWD).

NO

>> Repair or replace damaged parts.

P1734 7GR INCORRECT RATIO

TM-109

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01A (VQ35HR)]

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P1734 7GR INCORRECT RATIO

Description

INFOID:0000000005250097

This malfunction is detected when the A/T does not shift into 7GR 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:0000000005250098

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

• “

TM-110, "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 “7TH GR FNCTN P1734” of “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

P1734

Gear 7 Incorrect Ratio

The gear ratio is:
• 0.818 or more
• 0.728 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)

TM-110

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01A (VQ35HR)]

P1734 7GR INCORRECT RATIO

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 “P1734” is detected, check the DTC. Refer to 

TM-

150, "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 “P1734”
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-110, "Diagnosis Procedure"

.

YES-4 >> “P1734” is detected: Go to 

TM-110, "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:0000000005250099

1.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace A/T assembly. Refer to 

TM-181, "2WD : Exploded View"

 (2WD), 

TM-184, "AWD :

Exploded View"

 (AWD).

NO

>> Repair or replace damaged parts.

GEAR

: 7th

ACCELE POSI

: 0.7/8 or more

VEHICLE SPEED

: 10 km/h (7 MPH) or more

Selector lever

: “M” position

Gear position

: 7th

Accelerator pedal opening

: 0.7/8 or more

Vehicle speed

: 10 km/h (7 MPH) or more