Evaluating display group 1, display zone 1 - Engine speed (idle speed)

VAG1551 display	Possible cause	Corrective action
Less than specified	Throttle Valve Control Module J338 sticking/faulty	Check Throttle Valve Control Module J338 → Throttle Valve Control Module J338, checking
	Large amount of unmetered air (cannot be compensated for by the idling stabilization)	Check intake air system for leaks → Intake Air system, leak testing
		Perform idle speed check → Idle speed check
Greater than specified	Idle speed not detected	Check DTC memory → DTC memory, checking and erasing , DTC memory, checking and erasing
	Large amount of unmetered air (cannot be compensated for by the idling stabilization)	Check intake air system for leaks → Intake Air system, leak testing
	Throttle Valve Control Module J338 sticking/faulty	Check Throttle Valve Control Module J338 → Throttle Valve Control Module J338, checking
		Perform idle speed check → Idle speed check
	Supply voltage too low, engine tries to reduce charge difference through increased idle speed	Evaluation Evaluating display group 4, display zone 2 - control module voltage supply , display group 4, display zone 2