The engine accelerates without pressing the accelerator pedal

Make: Fiat
Model: 500 Factory Service Manual
Year: 2007–2024
Section: Engine › The engine accelerates without pressing the accelerator pedal

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Fault diagnosisThe engine accelerates without pressing the accelerator pedal

THE ENGINE ACCELERATES WITHOUT PRESSING THE ACCELERATOR PEDAL

1.3 Multijet

The customer complains that: The engine accelerates on itw own without operating the accelerator pedal

0	ACCELERATOR SIGNAL CHECK	All OK	Problems encountered	Operation
		Test results
	Check that the accelerator pedal is correctly positioned Connect an Examiner to the engine management control unit and check the accelerator pedal sensor is working properly by carrying out the See Test 1068AC ACCELERATOR PEDAL CHECKS Check the continuity/insulation of the wiring between the engine management control unit and the accelerator pedal See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT	Move on to Step 1	1. Accelerator pedal incorrectly positioned 2. Accelerator pedal sensor faulty 3. Wiring between the engine management control unit and the accelerator pedal defective	1. Position the accelerator pedal correctly 2. Replace the accelerator pedal Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R 3. Restore correct wiring
1	ENGINE CONTROL UNIT OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the engine control unit is working properly	End of diagnosis	Engine management control unit faulty with amount of fuel injected too high or not controlled	Replace the engine control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R

1.2 8v, 1.4 16v

The customer complains that: The engine accelerates on itw own without operating the accelerator pedal

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	ACCELERATOR SIGNAL CHECK	All OK	Problems encountered	Operation
	Check that the accelerator pedal is correctly positioned Connect an Examiner to the engine management control unit and check the accelerator pedal sensor is working properly Check the continuity/insulation of the wiring between the engine management control unit and the accelerator pedal See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT	Move on to Step 3	1. Accelerator pedal incorrectly positioned 2. Accelerator pedal defective 3. Wiring between the engine management control unit and the accelerator pedal defective	1. Position the accelerator pedal correctly 2. Replace the accelerator pedal Op. 1068A14 3. Restore correct wiring.
3	THROTTLE CASING CHECK	All OK	Problems encountered	Operation
	Check that the throttle body is working properly by carrying out the See Test 1056BW THROTTLE BODY ACTUATOR OPERATION CHECK Check the wiring continuity/insulation See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT	Move on to Step 4	1. Wiring defective 2. Throttle body defective	1. Restore correct wiring. 2. Replace throttle body Op. 1056B14
4	ENGINE CONTROL UNIT OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the engine control unit is working properly	End of diagnosis	Engine management control unit faulty with amount of fuel injected too high or not controlled	Replace the engine control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R

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Parts & tools for this job For 2007 Fiat 500

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