NO.9 ABNORMAL SHIFTING[FN4A-EL]

id0503a1801400

9

Abnormal shifting

DESCRIPTION

•  Shifts 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

•  APP sensor malfunction

•  Input/turbine speed sensor malfunction

3.  TR switch malfunction

•  Selector lever adjustment incorrect

•  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	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.
1		No	Repair open ground circuit. Reconnect the PCM.
2	(See PCM INSPECTION[ZJ, ZY, Z6].) (See PCM INSPECTION[LF, L3].) • TP • TSS • OSS • APP1 • APP2 • TP1 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).)
2		No	Repair or replace any malfunctioning parts.
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 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 PCM.