NO.30 DOES NOT DOWNSHIFT IN M POSITION [SJ6A-EL]

id050307825600

30
Does not downshift in M position
DESCRIPTION
•  Gear position indication in instrument cluster illuminates, but the vehicle does not downshift when the selector lever is pushed to “–” side or steering shift switch “DOWN” is pushed.
POSSIBLE CAUSE
•  Down switch or related wiring harness malfunction
•  Steering shift switch (DOWN) or related circuit malfunction.

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  Access TCM PID M_DOWN 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 down switch.
(See DOWN SWITCH INSPECTION [SJ6A-EL].)
If the down switch has a malfunction:
•  Replace the selector lever component.
If the down switch is normal:
•  Inspect for continuity the followings:
―  Between selector lever component terminal D (down switch signal) and instrument cluster G.
―  Between selector lever component terminal H and ground.
•  Repair or replace the suspected wiring harness.
2
•  Access TCM PID PADDLE_DOWN using the M-MDS.
•  Monitor the PID at the steering shift switch “DOWN” is pushed.
•  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 E (steering shift switch signal) and start stop unit 1N.
―  Between steering shift switch terminal D (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].)