#
NO.31 DOES NOT UPSHIFT IN M RANGE

BHE050301026W36

31 | Does not upshift in M range
DESCRIPTION | • Gear position indicator light in dashboard illuminates, but vehicle does not upshift when 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 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 2I. (See TCM INSPECTION.) Are the voltages normal? | Yes | Inspect the instrument cluster. (See MULTIPLEX COMMUNICATION SYSTEM.)
No | If terminal 2I voltage is abnormal, inspect the up switch. • If up switch is normal, inspect for continuity between the up switch and TCM terminal 2I. 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.)