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

id050307803500

30
Does not downshift in M range
DESCRIPTION
•  Gear position indicator light 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
•  Inspect the DWN SW PID value using the M-MDS when the selector lever is pushed to “–” side.
•  Is the DWN SW PID value normal?
Yes
Go to the next step.
No
Inspect the down switch.
(See SELECTOR LEVER COMPONENT INSPECTION.)
If the down switch has a malfunction:
•  Replace the selector lever component.
If the down switch is normal:
•  Inspect for continuity between selector lever component terminal F and TCM terminal 2F.
•  Repair or replace the suspected wiring harness.
2
•  Inspect the DWN SW PID value using the M-MDS when the steering shift switch “DOWN” is pushed.
•  Is the DWN SW PID value 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.)
If the steering shift switch has a malfunction:
•  Replace the steering shift switch.
If the steering shift switch is normal:
•  Inspect for continuity between steering shift switch terminal F and TCM terminal 2AF.
•  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].)