NO.9 ABNORMAL SHIFTING [SJ6A-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, turbine sensor, VSS), the control valve is stuck, or the clutch circuit is stuck. - Clutch slippage, burnt (C1 clutch, C2 clutch, C3 clutch, B1 brake, B2 brake, B3 brake) • Line pressure low • Incorrect throttle position signal • Incorrect accelerator pedal position signal • Incorrect engine speed signal • Incorrect engine coolant temperature signal • Incorrect engine torque signal • VSS malfunction • Turbine sensor malfunction • Sensor GND malfunction • TFT sensor malfunction • Line pressure control solenoid malfunction • Body GND malfunction • Control valve body malfunction • TCM malfunction Note • Before following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspection are conducted. (See BASIC INSPECTION [SJ6A-EL].)


STEP	INSPECTION		ACTION
1	• Inspect for continuity between the TCM terminal 1P, 1X and battery negative terminal. • Is there continuity?	Yes	Go to the next step.
1		No	Repair or replace ground circuit.
2	• Access the following PCM PIDs using the M-MDS. - RPM - APP - TP - ECT - ENG_TRQ • Are PIDs value normal?	Yes	Go to the next step.
2		No	Inspect and repair suspected PID related part.
3	• Inspect the TFT sensor. (See TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR INSPECTION [SJ6A-EL].) • Is the TFT sensor normal?	Yes	Go to the next step.
3		No	Replace the TFT sensor.
4	• Inspect the line pressure control solenoid. (See SOLENOID VALVE INSPECTION [SJ6A-EL].) • Is the line pressure control solenoid normal?	Yes	Inspect the TCM terminal for bend, damage, corrosion or poor contact.
4		No	Inspect the coupler component. If normal, replace the control valve body. (See CONTROL VALVE BODY REMOVAL [SJ6A-EL].) (See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)
5	• Verify test results. - If normal, return to the diagnostic index to service any additional symptoms. - If malfunction remains, inspect the related Service 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.