NO.9 ABNORMAL SHIFTING [JA5A-EL]


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.


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.
1		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.
2		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.