22 · Diagnostics

Engine idling high

Make: Fiat
Model: 500 Factory Service Manual
Year: 2007–2024
Section: Engine › Engine idling high

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Fault diagnosisEngine idling high

ENGINE IDLING HIGH

1.2 8v, 1.4 16v

The customer complains that: The engine idle speed has increased

1	CAN CHECKS	All OK	Problems encountered	Operation
		Test results
	Connect an EXAMINER and check the following on CAN INFORMATION: No faulty control units No faulty CAN	Move on to Step 2	Presence of errors	Continue as instructed by the diagnostic equipment
2	MODE PARAMETERS CHECK	All OK	Problems encountered	Operation
	Connect using the Examiner in the engine control unit. Check the value of the following parameters: Battery voltage Accelerator pedal Accelerator position 1 AD/C Accelerator position 2 AD/C Engine coolant temperature by carrying out the See Test 1056BC ENGINE COOLANT TEMPERATURE SENSOR OPERATION CHECK	Move on to Step 3	1. Battery voltage not correct 2. Alternator defective 3. Accelerator pedal potentiometer defective 4. Coolant temperature sensor defective	1. Charge, and if necessary replace, the battery 2. Replace the alternator, if defective Op. 5530A14 ALTERNATOR - R+R FOR VERSIONS WITH AIR CONDITIONOMG 3. Replace the accelerator pedal Op. 1068A14 4. Replace the coolant temperature sensor Op. 1056B50
3	MOTORIZED THROTTLE CHECK	All OK	Problems encountered	Operation
	Check that the motorized throttle is working properly, carrying out See Test 1056BW THROTTLE BODY ACTUATOR OPERATION CHECK Check the continuity of the wiring between the engine control unit and the motorized throttle See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT	End of diagnosis	1. Motorized throttle defective 2. Wiring defective	1. Replace the motorized throttle Op. 1056B14 2. Restore correct wiring

1.3 Multijet

The customer complains that: The engine idle speed has increased

1	CHECK USING THE EXAMINER	All OK	Problems encountered	Operation
		Test results
	Check for the presence of any faults by connecting to the engine management control unit using the Examiner	Move on to Step 2	Presence of errors	Continue as instructed by the diagnostic equipment
2	ALTERNATOR CHECK	All OK	Problems encountered	Operation
	Check that the alternator is working properly by carrying out See Test 5530AB Check alternator operation	Move on to Step 3	1. Alternator voltage too low 2. Alternator defective	1. Replace the voltage regulator Op. 5530A24 ALTERNATOR VOLTAGE REGULATOR - R.R. WITH ALTERNATOR REMOVED 2. Replace alternator Op. 5530A10 ALTERNATOR - R+R
3	ENGINE COOLANT TEMPERATURE SENSOR CHECK	All OK	Problems encountered	Operation
	Check that the engine coolant temperature sensor is working properly by carrying out See Test 1060OE ENGINE COOLANT TEMPERATURE SENSOR OPERATION CHECK	Move on to Step 4	1. Temperature measured too low 2. Sensor wiring defective	1. Replace the temperature sensor Op. 1060G14 ENGINE COOLANT TEMPERATURE SENSOR - R.R. 2. Restore correct wiring
4	ACCELERATOR PEDAL SENSOR CHECK	All OK	Problems encountered	Operation
	Check that the accelerator pedal is correctly positioned Using the Examiner, check that the accelerator pedal is working properly by carrying out See Test 1068AC ACCELERATOR PEDAL CHECKS	End of diagnosis	1. Accelerator pedal incorrectly positioned 2. Accelerator pedal sensor defective	1. Position the accelerator pedal correctly 2. Replace the accelerator pedal Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R

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Parts & tools for this job For 2007 Fiat 500

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