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NO.9 ABNORMAL SHIFTING [FN4A-EL]

BME050301030213

9 | Abnormal shifting
DESCRIPTION | • Shift 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 A malfunction
  • Shift solenoid B malfunction
  • Shift solenoid C malfunction
  • Body GND malfunction
  • Accelerator cable mis-adjustment

  2. Signal malfunction

  • Vehicle speed sensor malfunction
  • Sensor GND malfunction
  • TP sensor malfunction or mis-adjustment
  • Input/turbine speed sensor malfunction

  3. TR switch malfunction

  • Selector lever adjustment incorrect
  • TR sensor 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 PCM connector. Is the resistance between the ground terminal at the PCM connector and the body ground less than 5.0 ohms? | Yes | Go to the next step.
No | Repair open ground circuit. Reconnect the PCM.
2 | Inspect the value at the following PCM PIDs using the WDS or equivalent. (See PCM INSPECTION [L3].) • TP • TSS • VSS Are the PID values normal? | Yes | Overhaul the control valve body and repair or replace any malfunctioning parts. (See ATX workshop manual (FN4A-EL).) If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts. (See ATX workshop manual (FN4A-EL).)
No | Repair or replace any malfunctioning parts.