P0638 Throttle valve control

			Test results
0	COMPONENT CONCERNED	PRELIMINARY CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Engine management control unit	Check if "Overtemperature" is shown in the error details	Go to Step 1	The error detail is "Overtemperature"	Go to Step 4
1	COMPONENT CONCERNED	ELECTRICAL CONNECTION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Throttle valve wiring	Check for the presence of short circuit to Vbatt	Go to Step 2	Presence of short circuit to Vbatt.	Restore correct insulation to battery positive
2	COMPONENT CONCERNED	ELECTRICAL CONNECTION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Throttle valve wiring	Check for short circuits to earth	Go to Step 3	Presence of short circuit to earth	Restore correct insulation to earth
3	COMPONENT CONCERNED	ELECTRICAL CONNECTION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Throttle valve wiring	Check for an open circuit	Go to Step 4	Presence of open circuit	Restore the correct connections
4	COMPONENT CONCERNED	CHECK USING DIAGNOSIS EQUIPMENT	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Motorised throttle	Connect the diagnosis equipment to the engine management control unit, enter Active Diagnosis and perform the motorised throttle test	End of diagnosis	Motorised throttle faulty	Replace the motorised throttle Op. 1060G50 THROTTLE BODY - R.R