Infiniti FX35, FX50 (S51). Manual - part 1869

P1705 TP SENSOR

TM-283

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B (VK50VE)]

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YES

>> Check DTC detected item. Refer to 

TM-332, "DTC Index"

.

NO

>> GO TO 3.

3.

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-284

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B (VK50VE)]

P1721 VEHICLE SPEED SIGNAL

P1721 VEHICLE SPEED SIGNAL

Description

INFOID:0000000005250287

The vehicle speed signal is transmitted from unified meter and A/C amp. to TCM by CAN communication line.
The signal functions as an auxiliary device to the output speed sensor when it is malfunctioning. The TCM will
then use the vehicle speed signal.

DTC Logic

INFOID:0000000005250288

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

• Always drive vehicle at a safe speed.
• Be careful not to rev engine into the red zone on the tachometer.

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 “ESTM VSP SIG” in “Data Monitor” in “TRANSMISSION”.

3.

Drive vehicle and maintain the following conditions for 60 seconds or more.

4.

Perform “Self Diagnostic Results” in “TRANSMISSION”.

Is “P1721” detected?

YES

>> Go to 

TM-106, "Diagnosis Procedure"

.

NO

>> INSPECTION END

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P1721

Vehicle Speed Signal

• The vehicle speed transmit-

ted from the unified meter 
and A/C amp. to TCM is 5 km/
h (3MPH) or less when the 
vehicle speed detected by 
the output speed sensor is 20 
km/h or more. (Only when 
starts after the ignition switch 
is turned ON.)

• The vehicle speed detected 

by the output speed sensor 
does not decrease despite 
the 36 km/h (23 MPH) or 
more of deceleration in vehi-
cle speed received from the 
unified meter and A/C amp. 
when the vehicle speed 
transmitted from the unified 
meter and A/C amp. to TCM 
is 36 km/h (23 MPH) or more 
and the vehicle speed detect-
ed by the output speed sen-
sor is 24 (15 MPH) or more.

Harness or connectors
(Sensor circuit is open or short-
ed.)

ESTM VSP SIG

: 40 km/h (25 MPH) or more

P1721 VEHICLE SPEED SIGNAL

TM-285

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B (VK50VE)]

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Diagnosis Procedure

INFOID:0000000005250289

1.

CHECK DTC OF UNIFIED METER AND A/C AMP.

 With CONSULT-III

Perform “Self Diagnostic Results” in “METER/M&A”.
Is any DTC detected?

YES

>> Check DTC detected item. Refer to 

MWI-119, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK DTC OF TCM

 With CONSULT-III

Perform “Self Diagnostic Results” in “TRANSMISSION”.

Is any DTC other than “P1721” detected?

YES

>> Check DTC detected item. Refer to 

TM-332, "DTC Index"

.

NO

>> GO TO 3.

3.

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-286

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B (VK50VE)]

P1730 INTERLOCK

P1730 INTERLOCK

Description

INFOID:0000000005250290

Fail-safe function to detect interlock conditions.

DTC Logic

INFOID:0000000005250291

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-287, "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-287, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Judgment of A/T Interlock

INFOID:0000000005250292

Refer to 

TM-328, "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