29

Does not upshift in M position

DESCRIPTION

• Gear position indication in instrument cluster illuminates, but the vehicle does not upshift when the selector lever is pushed to “+” side or steering shift switch “UP” is pulled.

POSSIBLE CAUSE

• Up switch or related wiring harness malfunction

• Steering shift switch (UP) or related circuit malfunction.

STEP

INSPECTION

ACTION

1

• Access TCM PID M_UP using the M-MDS.

  (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [TCM (SJ6A-EL)].)

• Monitor the PID at the selector lever is pushed to “+” side.

• Are PID values normal?

Yes

Go to the next step.

No

Inspect the up switch.

(See UP SWITCH INSPECTION [SJ6A-EL].)

If the up switch has a malfunction:

• Replace the selector lever component.

  (See AUTOMATIC TRANSMISSION SHIFT MECHANISM REMOVAL/INSTALLATION.)

If the up switch is normal:

• Inspect for continuity the followings:

• Between selector lever component terminal D (up switch signal) and TCM terminal 2J.

• Between selector lever component terminal A and ground.

• Repair or replace the suspected wiring harness.

2

• Access TCM PID PADDLE_UP using the M-MDS.

  (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [TCM (SJ6A-EL)].)

• Monitor the PID at the steering shift switch “UP” is pulled.

• Are PID values normal?

Yes

Inspect the instrument cluster.

(See INSTRUMENT CLUSTER INSPECTION.)

Replace the instrument cluster, if necessary.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

No

Inspect the steering shift switch.

(See STEERING SHIFT SWITCH INSPECTION [SJ6A-EL].)

If the steering shift switch has a malfunction:

• Replace the steering shift switch.

  (See STEERING SHIFT SWITCH REMOVAL/INSTALLATION [SJ6A-EL].)

If the steering shift switch is normal:

• Inspect for continuity the followings:

• Between audio control switch terminal F (steering shift switch signal) and TCM terminal 2AF.

• Between audio control switch terminal C (steering shift switch ground) and TCM terminal 2AB.

• Repair or replace the suspected wiring harness.

3

• Verify test results.

• If normal, return to the diagnostic index to service any additional symptoms.

• If malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.

• If the vehicle is repaired, troubleshooting completed.

• If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM. (See TCM REMOVAL/INSTALLATION [SJ6A-EL].)