P1902

DTC P1902: Malfunction of Engine System

DIAGNOSTIC FUNCTION
^ When the ECM detects the malfunction of the ETV system, the ECM enters the limp-home control mode (throttle valve angle: approximately 20%).
^ TCM begins controlling the following items: lockup inhibition, increase of secondary pressure, fixing of pulley ratio line.

JUDGEMENT CRITERIA
TCM receives the limp-home signal from ECM via CAN.

PROBABLE CAUSES
^ Malfunction of the engine system (ETV)

DIAGNOSIS PROCEDURE

STEP 1. Check the engine-related diagnosis code.

Q: Is the engine-related diagnosis code set?
YES: Carry out the appropriate troubleshooting.
NO: Go to Step 2.

STEP 2. Symptom recheck after erasing diagnosis code

Q: Is the check result normal?
YES: Intermittent malfunction
NO: Replace the TCM.