Nissan Titan A60. Manual - part 923

TM-80

< DTC/CIRCUIT DIAGNOSIS >

P1721 VEHICLE SPEED SIGNAL

P1721 VEHICLE SPEED SIGNAL

Description

INFOID:0000000006159345

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:0000000006159346

On Board Diagnosis Logic

INFOID:0000000006159347

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

• Diagnostic trouble code “P1721” with CONSULT-III is detected when TCM does not receive the proper vehi-

cle speed signal (input by CAN communication) from combination meter.

Possible Cause

INFOID:0000000006159348

Harness or connectors

(The sensor circuit is open or shorted.)

DTC Confirmation Procedure

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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: 1.0/8 or less

VHCL/S SE-MTR: 30 km/h (19 MPH) or more

4. If DTC is detected, go to 

TM-80, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006159350

1.

CHECK CAN COMMUNICATION LINE

Perform the self-diagnosis. Refer 

TM-36, "CONSULT-III Function (TRANSMISSION)"

.

Is a malfunction in the CAN communication indicated in the results?

YES

>> Check CAN communication line. Refer to 

TM-45

.

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·TR

 During driving

Approximately matches the speedometer reading.

P1721 VEHICLE SPEED SIGNAL

TM-81

< DTC/CIRCUIT 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-80, "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-101, "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-197, "Control Valve with TCM"

.

NG

>> Repair or replace damaged parts.

TM-82

< DTC/CIRCUIT DIAGNOSIS >

P1730 INTERLOCK

P1730 INTERLOCK

Description

INFOID:0000000006159351

Fail-safe function to detect interlock conditions.

On Board Diagnosis Logic

INFOID:0000000006159352

• This is an OBD-II self-diagnostic item.

• Diagnostic trouble code “P1730” with CONSULT-III or 12th judgment flicker without CONSULT-III is detected

when TCM does not receive the proper voltage signal from the sensor and switch.

• TCM monitors and compares gear position and conditions of each ATF pressure switch when gear is steady.

Possible Cause

INFOID:0000000006159353

• Harness or connectors

(The solenoid and switch circuit is open or shorted.)

• Low coast brake solenoid valve

• ATF pressure switch 2

DTC Confirmation Procedure

INFOID:0000000006159354

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.

4. Drive vehicle and maintain the following conditions for at least 2 consecutive seconds.

SLCT LVR POSI: “D” position 

5. If DTC is detected, go to 

TM-82, "Diagnosis Procedure"

.

 WITH GST

Follow the procedure “With CONSULT-III”.

Judgment of Interlock

INFOID:0000000006159355

• When Interlock is judged to be malfunctioning, the vehicle should be fixed in 2GR, and should be set in a

condition in which it can travel.

NOTE:

When the vehicle is driven fixed in 2GR, a input speed sensor malfunction is displayed, but this is not a input

speed sensor malfunction.

• When interlock is detected at the 3GR or more, it is locked at the 2GR.

Diagnosis Procedure

INFOID:0000000006159356

1.

SELF-DIAGNOSIS

With CONSULT-III

1. Drive vehicle.

2. Stop vehicle and turn ignition switch “OFF”.

3. Turn ignition switch “ON”. 

4. Select “SELF-DIAG RESULTS” mode for “TRANSMISSION” with CONSULT-III.
 OK or NG

OK

>> GO TO 2.

NG

>> Check low coast brake solenoid valve circuit and function. Refer to 

TM-94, "Diagnosis Proce-

dure"

, 

TM-97, "Diagnosis Procedure"

.

2.

CHECK DTC

Perform “DTC Confirmation Procedure”.

P1730 INTERLOCK

TM-83

< DTC/CIRCUIT DIAGNOSIS >

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

• Refer to 

TM-82, "DTC Confirmation Procedure"

.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 3.

3.

CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to 

TM-101, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

4.

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-197, "Control Valve with TCM"

.

NG

>> Repair or replace damaged parts.