NO.9 ABNORMAL SHIFTING[FS5A-EL]


id050308801400

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 F malfunction
•  Shift solenoid A malfunction
•  Shift solenoid B malfunction
•  Shift solenoid C malfunction
•  Pressure control solenoid B malfunction
•  Body GND malfunction
•  Accelerator cable mis-adjustment
2.  Signal malfunction
•  Vehicle speed sensor malfunction
•  Sensor GND malfunction
•  APP sensor malfunction
•  TP 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 TCM connector.
Is the resistance between the ground terminal at the TCM connector and the body ground less than 5.0 ohms?
Yes
Go to the next step.
No
Repair open ground circuit. Reconnect the TCM.
2
Inspect the value at the following PCM and TCM PIDs using the M-MDS.
PCM PIDs:
•  APP
•  TP REL
TCM PIDs:
•  THOP
•  TSS
•  OSS
•  VSS
Are the PID values normal?
Yes
Overhaul the control valve body and repair or replace any malfunctioning parts.
(See ATX workshop manual [FS5A-EL].)
If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts.
(See ATX workshop manual [FS5A-EL].)
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 TCM.