SHIFT POINT IS HIGH OR LOW [FW6A-EL]

id050315101400

TROUBLESHOOTING ITEM

Shift point is high or low

DESCRIPTION

•  Shift point considerably different from automatic shift diagram.

•  Shift delays when accelerating.

•  Shift occurs suddenly when accelerating and engine speed does not increase.

POSSIBLE CAUSE

1.  Signal malfunction

―  APP sensor malfunction

―  BARO sensor malfunction

―  Brake switch malfunction

―  ECT sensor malfunction

―  IAT sensor No.1 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.

TROUBLESHOOTING ITEM	Shift point is high or low
DESCRIPTION	• Shift point considerably different from automatic shift diagram. • Shift delays when accelerating. • Shift occurs suddenly when accelerating and engine speed does not increase.
POSSIBLE CAUSE	1. Signal malfunction ― APP sensor malfunction ― BARO sensor malfunction ― Brake switch malfunction ― ECT sensor malfunction ― IAT sensor No.1 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. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0].) ― APP (APP sensor) ― BARO (BARO sensor) ― BOO (Brake switch) ― ECT (ECT sensor) ― IAT (IAT sensor No.1) • Is there any malfunction? (See PCM INSPECTION [SKYACTIV-G 2.0].)	Yes	Repair or replace any malfunctioning parts according to the inspection result.
1		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.
2		No	Replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.)