NO.29 DOES NOT UPSHIFT IN M POSITION [AY6A-EL, AY6AX-EL]

id0503k3825500

29 | Does not upshift in M position
DESCRIPTION | • Gear position indicator light in instrument cluster illuminates, but the vehicle does not upshift when the selector lever is pushed to “+” side.
POSSIBLE CAUSE | • Up switch or M position switch (built-in selector lever component) or related wiring harness malfunction • Multiplex communication system malfunction (Shift position signal is incorrect.) ― Between TCM and instrument cluster Note • Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See BASIC INSPECTION [AY6A-EL, AY6AX-EL].)

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • Retrieve any instrument cluster DTCs using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) • Are there any CAN communication DTCs displayed? | Yes | Go to appropriate the DTC inspection. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM (L.H.D.)].) (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM (R.H.D.)].)
No | Go to the next step.
2 | • Shift the selector lever to M position. • Verify that the gear position indicator light illumination. • Does the gear position indicator light illuminate? | Yes | Go to the next step.
No | Go to No.27 “GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN D OR M POSITION”.
3 | • Access the TCM PID UP_SW using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [AY6A-EL, AY6AX-EL].) • Monitor the UP_SW PID with move the selector lever to “+” with M position. • Does the UP_SW PID indicate properly? | Yes | Inspect the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
No | Inspect the up switch. (See SELECTOR LEVER COMPONENT INSPECTION.) If the up switch is normal, inspect for continuity between the selector lever component terminal A and TCM terminal A3.
4 | • Verify test results. ― If normal, return to the diagnostic index to service any additional symptoms. ― If 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.