NO.9 ABNORMAL SHIFTING [FN4A-EL]

id050301801400

9

Abnormal shifting

DESCRIPTION

•  Shift incorrectly (incorrect shift pattern).

POSSIBLE CAUSE

•  There is a malfunction in the signal circuit which controls shifting (accelerator pedal position 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 slipped, burned

•  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 pedal position sensor malfunction

2.  Signal malfunction

•  Vehicle speed sensor malfunction

•  Sensor GND malfunction

•  Accelerator pedal position sensor malfunction

•  Input/turbine speed sensor malfunction

3.  TR switch malfunction

•  Selector cable adjustment incorrect

•  TR switch adjustment incorrect

Note

•  Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted.

Diagnostic procedure

STEP	INSPECTION		ACTION
1	Disconnect PCM connector. Is resistance between GND terminal at PCM connector and body GND less than 5.0 ohms?	Yes	Go to next step.
1		No	Repair open GND circuit. Reconnect PCM connector.
2	Check the value at the following PIDs using the M-MDS. (See PCM INSPECTION [MZR 1.3, MZR 1.5].) • APP • TSS • VSS Are PID values okay?	Yes	Overhaul control valve body and repair or replace any defective parts. If problem remains, overhaul transaxle and repair or replace any defective parts.
2		No	Repair or replace any defective parts.
3	• Verify test results. ― If okay, return to diagnostic index to service any additional symptoms. ― If malfunction remains, inspect related Service informations and perform repair or diagnosis. • If vehicle not repaired, trouble shooting completed. • If vehicle not repaired or additional diagnostic information not available, replace PCM.