NO.31 DOES NOT UPSHIFT IN M RANGE


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.)


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.)
1		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.)