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NO.9 ABNORMAL SHIFTING [FS5A-EL]

id050308801400

9 | Abnormal shifting
DESCRIPTION | • Shifts incorrectly (incorrect shift pattern).
POSSIBLE CAUSE | • There is a malfunction in the signal circuit which controls shifting (TP sensor, input/turbine speed sensor, vehicle speed sensor), the control valve is stuck, the accumulator (forward or servo apply) is stuck, or the clutch circuit is stuck. 1. Clutch slippage, burnt • Line pressure low • Control valve body malfunction • Shift solenoid D malfunction • Shift solenoid E malfunction • Shift solenoid F malfunction • Shift solenoid A malfunction • Shift solenoid B malfunction • Shift solenoid C malfunction • Pressure control solenoid B malfunction • Body GND malfunction • Accelerator cable mis-adjustment 2. Signal malfunction • Vehicle speed sensor malfunction • Sensor GND malfunction • APP sensor malfunction • TP sensor malfunction • Input/turbine speed sensor malfunction 3. TR switch malfunction • Selector lever adjustment incorrect • TR switch adjustment incorrect Note • Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | Disconnect the TCM connector. Is the resistance between the ground terminal at the TCM connector and the body ground less than 5.0 ohms? | Yes | Go to the next step.
No | Repair open ground circuit. Reconnect the TCM.
2 | Inspect the value at the following PCM and TCM PIDs using the WDS or equivalent. (See PCM INSPECTION [L8, LF, L3].) (See TCM INSPECTION [FS5A-EL].) PCM PIDs: • APP • TP REL TCM PIDs: • THOP • TSS • OSS • VSS Are the PID values normal? | Yes | Overhaul the control valve body and repair or replace any malfunctioning parts. (See ATX workshop manual [FS5A-EL].) If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts. (See ATX workshop manual [FS5A-EL].)
No | Repair or replace any malfunctioning parts.
3 | • Verify the 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 is completed. • If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM.