ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING [FW6A-EL]

id050315101700

TROUBLESHOOTING ITEM

Engine flares up or slips when upshifting or downshifting

DESCRIPTION

•  When accelerator pedal is depressed, engine speed increases normally but vehicle speed increases slowly.

•  When accelerator pedal is depressed while driving, engine speed increases but vehicle speed does not.

POSSIBLE CAUSE

1.  Signal malfunction

―  APP sensor malfunction

―  CKP sensor malfunction

―  MAF sensor malfunction

2.  Poor GND

TROUBLESHOOTING ITEM	Engine flares up or slips when upshifting or downshifting
DESCRIPTION	• When accelerator pedal is depressed, engine speed increases normally but vehicle speed increases slowly. • When accelerator pedal is depressed while driving, engine speed increases but vehicle speed does not.
POSSIBLE CAUSE	1. Signal malfunction ― APP sensor malfunction ― CKP sensor malfunction ― MAF sensor malfunction 2. Poor GND

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY MALFUNCTION SYMPTOM • Is the malfunction symptom at the same level compared to a vehicle of the same model?	Yes	Symptom troubleshooting is completed.
1		No	Go to the next step.
2	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) ― MAF (MAF sensor) ― RPM (CKP sensor) • Is there any malfunction? (See PCM INSPECTION [SKYACTIV-G 2.0].)	Yes	Repair or replace any malfunctioning parts according to the inspection result.
2		No	Go to the next step.
3	INSPECT TCM FOR POOR GND • 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.
3		No	Symptom troubleshooting is completed.