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

• Insufficient TCM learning

• Signal malfunction

• APP sensor malfunction

• CKP sensor malfunction

• MAF sensor malfunction

Item (definition)

Unit/Condition

Definition

Condition/Specification (Reference)

APP

%

Accelerator pedal position

• Accelerator pedal released: Approx. 0%

• Accelerator pedal depressed: Approx. 100%

MAF

g/Sec

Mass air flow

• Displays MAF

V

• Switch ignition ON (engine off) (MAF: 0.59 g/s {0.078 lb/min}): Approx. 0.72 V

• Idle (after warm up) (MAF: 2.17 g/s {0.287 lb/min}): Approx. 0.86 V

• Racing (engine speed is 2,000 rpm) (MAF: 4.73 g/s {0.626 lb/min}): Approx. 1.07 V

RPM

RPM

Engine speed

• Displays engine speed

STEP

INSPECTION

ACTION

1

• Is the malfunction symptom at the same level compared to a vehicle of the same model?

Yes

Symptom troubleshooting is completed.

No

Go to the next step.

2

• Perform the initial learning.

  (See INITIAL LEARNING [FW6A-EL].)

• Does the symptom disappear?

Yes

Symptom troubleshooting is completed.

No

Go to the next step.

3

• Inspect the value at the following PCM PIDs using the M-MDS.

  (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].)

• APP (APP sensor)

• MAF (MAF sensor)

• RPM (CKP sensor)

• Is there any malfunction?

Yes

Repair or replace any malfunctioning parts according to the inspection result.

No

Symptom troubleshooting is completed.