NO.30 DOES NOT DOWNSHIFT IN M RANGE [AW6A-EL, AW6AX-EL]

id050310803500

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.
POSSIBLE CAUSE
•  Down switch or M range switch (built-in selector lever component) or related wiring harness malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  Select the selector lever to M range.
•  Verify that the gear position indicator light illumination.
•  Does gear position indicator light illuminate?
Yes
Go to next step.
No
Go to “NO.27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN D OR M RANGE” or “NO.28 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN D RANGE OR P, R AND N POSITION”.
(See NO.27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN D OR M RANGE [AW6A-EL, AW6AX-EL].)
(See NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATE IN P, R OR N RANGE [AW6A-EL, AW6AX-EL].)
2
•  Access the TCM PID DWN_SW using the M-MDS.
•  Monitor the DWN_SW PID with move the selector lever to “-” with M range.
•  Does the DWN_SW PID indicate property?
Yes
Inspect the instrument cluster.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
No
Inspect the down switch.
(See SELECTOR LEVER COMPONENT INSPECTION.)
•  If the up switch is normal, inspect for continuity between the selector lever component terminal B and TCM terminal A4.
3
•  Verify test results.
―  If normal, return to the diagnostic index to service any additional symptoms.
―  If the 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.