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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?

	Carry out the appropriate troubleshooting.

	Go to Step 2.

STEP 2. Symptom recheck after erasing diagnosis code

Q. Is the check result normal?

	Intermittent malfunction

	Replace the TCM.