NO.32 DOES NOT DOWNSHIFT IN M RANGE


BHE050301026W37

32

Does not downshift in M range

DESCRIPTION

• Gear position indicator light in dashboard illuminates, but vehicle does not downshift when 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 or related circuit malfunction
Note
• Before following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspection are conducted. (See BASIC INSPECTION.)

Diagnostic procedure

STEP

INSPECTION

ACTION

1
Inspect the voltage at TCM terminals 1W and 2D.
Are the voltages normal?
Yes
Inspect the instrument cluster.
No
If terminal 2D voltage is abnormal, inspect down switch.
• If down switch is normal, inspect for continuity between down switch and TCM terminal 2D.
Inspect the steering shift switch.
• If the steering shift switch is normal, inspect for continuity between the steering shift switch and TCM terminal 1W.
2
Verify the test results.
• If normal, return to the diagnostic index to service any additional symptoms.
• If the 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.)