ABNORMAL SHIFTING [GW6A-EL, GW6AX-EL]

id050320101200

TROUBLESHOOTING ITEM

Abnormal shifting
DESCRIPTION
•  Shifts incorrectly (incorrect shift pattern).
POSSIBLE CAUSE
1.  Signal malfunction
?  APP sensor malfunction
?  BARO sensor malfunction
?  Brake switch malfunction
?  CKP sensor malfunction
?  ECT sensor No.1 malfunction
?  IAT sensor No.1 malfunction
?  MAF sensor malfunction
2.  Low-G (XY) sensor (built into SAS control module) malfunction
Note
•  When driving on high-altitude roads, the TCM determines that the driving mode is the AAS mode, and may change to a different shift timing from the normal timing.
•  When SPORT mode is selected, a gear lower than NORMAL mode is selected, and the gear is maintained for a longer period of time.
•  If the engine coolant temperature is low, a gear lower than when in normal mode is selected.

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT SIGNAL PARTS FOR MALFUNCTION
•  Inspect the value at the following PCM PIDs using the M-MDS.
?  APP (APP sensor)
?  BARO (BARO sensor)
?  BOO (Brake switch)
?  ECT (ECT sensor No.1)
?  IAT (IAT sensor No.1)
?  MAF (MAF sensor)
?  RPM (CKP sensor)
•  Is there any malfunction?
Yes
Repair or replace any malfunctioning parts according to the inspection result.
No
Go to the next step.
2
VERIFY IF MALFUNCTION CAUSE IS LOW-G (XY) SENSOR
•  Is there any malfunction?
Yes
Replace the SAS control module.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
No
Symptom troubleshooting is completed.