ABNORMAL SHIFTING [FW6A-EL]

id050315101200

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 malfunction
―  IAT sensor No.1 malfunction
―  MAF sensor malfunction
2.  Poor GND
3.  Low-G (XY) sensor (built into SAS control module) malfunction
Note
•  If a tire of a different diameter from the standard tire is installed, the TCM determines that the driving mode is the AAS mode, and may change to a different shift timing from the normal timing.

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)
―  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 TCM GND OR LOW-G (XY) SENSOR
•  Switch the ignition to off.
•  Disconnect the TCM connector.
•  Visually inspect for pin deformity, open circuit, or wiring harness non-insulation between TCM terminal 1B and body GND.
•  Is there any malfunction?
Yes
Repair or replace any malfunctioning parts according to the inspection result.
No
Replace the SAS control module.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)