NO.9 ABNORMAL SHIFTING [5R55S]

id0503c1801400

9

Abnormal shifting

DESCRIPTION

•  Shifts incorrectly (incorrect shift pattern).

POSSIBLE CAUSE

•  There is a malfunction in the signal circuit which controls shifting (accelerator pedal position sensor, TSS sensor, OSS sensor), the control valve is stuck, the accumulator (forward or servo apply) is stuck, or the clutch circuit is stuck.

1.  Clutch slippage, burned

•  Fluid level low

•  Line pressure low

•  Control valve body malfunction

•  Shift solenoid D malfunction

•  Shift solenoid A malfunction

•  Shift solenoid B malfunction

•  Shift solenoid C malfunction

•  Pressure control solenoid A, B and C malfunction

•  Body ground malfunction

2.  Signal malfunction

•  OSS sensor malfunction

•  Sensor ground malfunction

•  Accelerator pedal position sensor malfunction

•  IAT sensor malfunction

3.  Digital TR sensor malfunction

•  Selector lever adjustment incorrect

•  Digital TR sensor adjustment incorrect

Note

•  Before the following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspections are conducted.
(See BASIC INSPECTION [5R55S].)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	Disconnect the TCM connector. Is the resistance between TCM ground terminal CO and body ground, and between TCM ground terminal CL and body ground less than 5.0 ohms?	Yes	Go to the next step.
1		No	Repair the open ground circuit. Reconnect the TCM connector.
2	Check the value at the following. (See PCM INSPECTION (Thailand, General (L.H.D. R.H.D.) specs.) [WL-C, WE-C].) (See PID/DATA MONITOR INSPECTION [5R55S].) PCM PIDs (using IDS/PDS): • APP TCM PIDs (using IDS/PDS): • TSS • OSS • VSS Are they normal?	Yes	Clean and inspect main control, if parts are damaged replace main control. If the problem remains, overhaul the transmission and repair or replace any malfunctioning parts.
2		No	Repair or replace any malfunctioning parts.
3	• Verify 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 repaired, the troubleshooting is completed. • If the vehicle the not repaired or additional diagnostic information is not available, replace the TCM.