Infiniti QX56 (JA60). Manual - part 943

TM-74

< COMPONENT DIAGNOSIS >

P1710 TRANSMISSION FLUID TEMPERATURE SENSOR

2.

CHECK A/T FLUID TEMPERATURE SENSOR 1 

Check A/T fluid temperature sensor 1. Refer to 

TM-74, "Component Inspection"

.

OK or NG

OK

>> GO TO 3.

NG

>> Replace the control valve with TCM. Refer to 

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

Temperature Sensor 2 and Plug"

.

3.

CHECK SUB-HARNESS

1. Disconnect transmission range switch connector and TCM connector.

2. Check continuity between transmission range switch connector

(A) terminals and TCM connector (B) terminals.

3. If OK, check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 4.

NG

>> Replace open circuit or short to ground and short to power in harness or connectors.

4.

CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

1. Check TCM power supply and ground circuit. Refer to 

TM-94, "Diagnosis Procedure"

.

2. Reinstall any part removed.
OK or NG

OK

>> Replace the control valve with TCM. Refer to 

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

Temperature Sensor 2 and Plug"

.

NG

>> Repair or replace damaged parts.

5.

CHECK DTC

Perform “DTC Confirmation Procedure”.

• Refer to 

TM-73, "DTC Confirmation Procedure"

.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 1.

Component Inspection

INFOID:0000000005148623

A/T FLUID TEMPERATURE SENSOR 1

1. Remove control valve with TCM. Refer to 

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

Sensor 2 and Plug"

.

2. Check resistance between transmission range switch connector

(A) terminals.

Item

Connector

Terminal

Continuity

Transmission range switch con-
nector

F505

6

Yes

TCM connector

F503

19

Transmission range switch con-
nector

F505

7

Yes

TCM connector

F503

18

JSDIA1330ZZ

Item

Terminal

Temperature 

°C 

(

°F)

Resistance (Ap-

prox.) (k

Ω)

0 (32)

15

A/T fluid temperature sensor 1

6-7

20 (68)

6.5

80 (176)

0.9

JSDIA1331ZZ

P1710 TRANSMISSION FLUID TEMPERATURE SENSOR

TM-75

< COMPONENT DIAGNOSIS >

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

3. If NG, replace the control valve with TCM. Refer to 

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

perature Sensor 2 and Plug"

.

TM-76

< COMPONENT DIAGNOSIS >

P1721 VEHICLE SPEED SIGNAL

P1721 VEHICLE SPEED SIGNAL

Description

INFOID:0000000005148624

The vehicle speed signal is transmitted from combination meter to TCM by CAN communication line. The sig-

nal functions as an auxiliary device to the output speed sensor when it is malfunctioning. The TCM will then

use the vehicle speed signal.

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000005148625

On Board Diagnosis Logic

INFOID:0000000005148626

• This is not an OBD-II self-diagnostic item.

• Diagnostic trouble code “P1721 VEHICLE SPEED SIGNAL” with CONSULT-III is detected when TCM does

not receive the proper vehicle speed signal (input by CAN communication) from combination meter.

Possible Cause

INFOID:0000000005148627

Harness or connectors

(The sensor circuit is open or shorted.)

DTC Confirmation Procedure

INFOID:0000000005148628

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 “TRANSMISSION” with CONSULT-III.

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

ACCELE POSI: 1/8 or less

VHCL/S SE-MTR: 30 km/h (17 MPH) or more

4. If DTC is detected, go to 

TM-76, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005148629

1.

CHECK CAN COMMUNICATION LINE

Perform the self-diagnosis. Refer 

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

.

NO

>> GO TO 2.

2.

CHECK INPUT SIGNAL

With CONSULT-III

1. Start engine.

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

3. Drive vehicle and read out the value of “VHCL/S SE-MTR”.

OK or NG

OK

>> GO TO 4.

Item name

Condition 

Display value (km/h)

VHCL/S SE-MTR

 During driving

 Approximately matches the speedometer reading.

Item name

Condition 

Display value (Approx.)(km/h)

VHCL/S SE-MTR

During driving

Approximately matches the speedometer reading.

P1721 VEHICLE SPEED SIGNAL

TM-77

< COMPONENT DIAGNOSIS >

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

NG

>> GO TO 3.

3.

CHECK COMBINATION METERS

Check combination meter. Refer to 

MWI-4, "Work Flow"

.

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

4.

CHECK DTC

Perform “DTC Confirmation Procedure”.

• Refer to 

TM-76, "DTC Confirmation Procedure"

.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 5.

5.

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 6.

NG

>> Repair or replace damaged parts.

6.

DETECT MALFUNCTIONING ITEM

Check the following items:

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

OK

>> Replace the control valve with TCM. Refer to 

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

Temperature Sensor 2 and Plug"

.

NG

>> Repair or replace damaged parts.