NO.29 DOES NOT UPSHIFT IN M POSITION [SJ6A-EL]

id050307825500

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.

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  Access TCM PID M_UP using the M-MDS.
•  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.
If the up switch is normal:
•  Inspect for continuity the followings:
―  Between selector lever component terminal C (up switch signal) and instrument cluster F.
―  Between selector lever component terminal H and ground.
•  Repair or replace the suspected wiring harness.
2
•  Access TCM PID PADDLE_UP using the M-MDS.
•  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.
If the steering shift switch is normal:
•  Inspect for continuity the followings:
―  Between steering shift switch terminal A (steering shift switch signal) and start stop unit 1L.
―  Between steering shift switch terminal B (steering shift switch ground) and ground.
•  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 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].)