Infiniti FX35, FX50 (S51). Manual - part 1870

P1730 INTERLOCK

TM-287

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B (VK50VE)]

C

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Diagnosis Procedure

INFOID:0000000005250293

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.

TM-288

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B (VK50VE)]

P1734 7GR INCORRECT RATIO

P1734 7GR INCORRECT RATIO

Description

INFOID:0000000005250294

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:0000000005250295

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

• “

TM-289, "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” 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

P1734

Gear 7 Incorrect Ratio

The gear ratio is:
• 0.822 or more
• 0.729 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)

P1734 7GR INCORRECT RATIO

TM-289

< 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 “P1734” 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 “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-289, "Diagnosis Procedure"

.

YES-4 >> “P1734” is detected: Go to 

TM-289, "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:0000000005250296

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

: 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

TM-290

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B (VK50VE)]

P1815 M-MODE SWITCH

P1815 M-MODE SWITCH

Description

INFOID:0000000005250297

• The manual mode switch [manual mode select switch and manual mode position select switch (shift-up/shift-

down)] is installed in the A/T shift selector assembly. It transmits manual mode switch, shift up and shift
down switch signals to unified meter and A/C amp. Then unified meter and A/C amp. transmits signals to
TCM via CAN communication.

• Manual mode select switch transmits manual mode switch signal or non-manual mode switch signal to uni-

fied meter and A/C amp. Then TCM receives signals from unified meter and A/C amp. via CAN communica-
tion.

• The manual mode position select switch (shift-up) transmits manual mode shift up signal to the unified meter

and A/C amp. Then TCM receives signal from the unified meter and A/C amp. via CAN communication.

• The manual mode position select switch (shift-down) transmits manual mode shift down signal to the unified

meter and A/C amp. Then TCM receives signal from the unified meter and A/C amp. via CAN communica-
tion.

• The paddle shifter transmits shift up and shift down switch signals to unified meter and A/C amp. Then TCM

receives signals from the unified meter and A/C amp. via CAN communication. (With paddle shifter)

• The TCM transmits manual mode indicator signal to the unified meter and A/C amp. via CAN communication

line.

DTC Logic

INFOID:0000000005250298

DTC DETECTION LOGIC

*: With paddle shifter

DTC CONFIRMATION PROCEDURE

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.

Turn ignition switch ON.

2.

Select “SLCT LVR POSI” and “MANU MODE SW” in “Data Monitor” in “TRANSMISSION”.

3.

Maintain the following each conditions more than 60 seconds.

4.

Perform “Self Diagnostic Results” in “TRANSMISSION”.

Is “P1815” detected?

YES

>> Go to 

TM-291, "Diagnosis Procedure"

.

NO

>> INSPECTION END

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P1815

Manual Mode Switch Circuit

• TCM monitors manual mode, 

non manual mode, up or 
down switch signal, and de-
tects as irregular when im-
possible input pattern occurs 
2 second or more.

• When shift up/down signal of 

paddle shifter continuously 
remains ON for 60 seconds*.

• Harness or connectors

(These switches circuit is 
open or shorted.)

• Manual mode select switch 

(Into A/T shift selector)

• Manual mode position select 

switch (Into A/T shift selector)

• Paddle shifter*

SLCT LVR POSI

: D

MANU MODE SW

: ON