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NO.9 ABNORMAL SHIFTING [JA5A-EL]

BME050301030245

9 | Abnormal shifting
DESCRIPTION | • Shift incorrectly (incorrect shift pattern).
POSSIBLE CAUSE | • There is a malfunction in the signal circuit which controls shifting (Throttle position signal, input/turbine speed sensor, VSS), control valve is stuck, or the clutch circuit is stuck.

  1. Clutch slippage, burnt

  • Line pressure low
  • Incorrect throttle position signal
  • VSS malfunction
  • Input/turbine speed sensor malfunction
  • Sensor GND malfunction
  • Shift solenoid A, B, or C malfunction
  • TCC solenoid valve malfunction
  • Body GND malfunction
  • Accelerator cable mis-adjustment
  • Control valve body malfunction

  2. TR switch malfunction

  • 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 | Inspect the continuity between TCM terminals C and Y and transaxle case. Is there continuity? | Yes | Go to the next step.
No | Repair or replace ground circuit.
2 | Stop the engine. Inspect the shift solenoid A, B, or C circuit. Are they normal? | Yes | Inspect the TCM terminal for bend, damage, corrosion or poor contact.
No | Inspect the connection of the shift solenoid A, B, or C terminal on the ATX for bend, damage, corrosion or looseness. Inspect for stuck shift solenoid. (See SOLENOID VALVE INSPECTION [JA5A-EL].) If the shift solenoids normal, inspect for open or short circuit between the TCM terminals 2W, 2T, 2X and coupler component terminals I, G, or F.
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 Bulletins and/or On-line Repair 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.