22 · Diagnostics

Engine idling high

Fault diagnosisEngine idling high

ENGINE IDLING HIGH

1.4 16v

The customer complains that: The engine idle speed has increased

1	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	Move on to Step 2	Battery voltage not correct	Charge, and if necessary replace, the battery
			Alternator defective	Replace the alternator, if defective Op. 5530A10 ALTERNATOR - R+R
			Accelerator pedal potentiometer defective	Replace the accelerator pedal Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R
			Coolant temperature sensor defective	Replace the coolant temperature sensor
2	MOTORIZED THROTTLE CHECK	All OK	Problems encountered	Operation
	- Check that the motorized throttle is working properly, Test 1056 BW See Test 1056BW Check on the throttle body actuator operation - Check the continuity of the wiring between the engine control unit and the motorized throttle	End of diagnosis	Motorized throttle defective	Replace the motorized throttle Op. 1056B14 THROTTLE CASE - R + R
		End of diagnosis	Wiring defective	Restore wiring

1.9 JTD 8v, 1.9 JTD 16v

The customer complains that: The engine idle speed has increased

		Test results
1	MODE PARAMETERS CHECK	All OK	Problems encountered	Operation
	Select the following control unit at the diagnostic equipment: EDC16C39 Diesel electronic injection control unit. Check the value of the following parameters: · Battery voltage See Test 5530BB BATTERY VOLTAGE CHECK · Accelerator pedal · Accelerator position 1 AD/C · Accelerator position 2 AD/C See Test 1068AC ACCELERATOR PEDAL CHECKS · Air temperature in the intake manifold See Test 1064BD SUPERCHARGING TEMPERATURE CHECK · Engine coolant temperature See Test 5030AA COOLANT TEMPERATURE SENSOR CHECK · Engine rpm · Target Diesel pressure · Measured Diesel pressure See Test 1060GH DIESEL PRESSURE CHECK	End of diagnosis

Test results

MODE PARAMETERS CHECK

All OK

Problems encountered

Operation

Select the following control unit at the diagnostic equipment: EDC16C39 Diesel electronic injection control unit.

Check the value of the following parameters:

· Battery voltage

· Accelerator pedal

· Accelerator position 1 AD/C

· Accelerator position 2 AD/C

· Air temperature in the intake manifold

· Engine coolant temperature

· Engine rpm

· Target Diesel pressure

· Measured Diesel pressure

End of diagnosis

1.4 16v TJet

The customer complains that: The engine idle speed has increased

1	MODE PARAMETERS CHECK	All OK	Problems encountered	Operation
		Test results
	Connect using the Examiner in the engine management control unit and check the value of the following parameters: - Battery voltage - Accelerator pedal - Accelerator position 1 AD/C - Accelerator position 2 AD/C - Engine coolant temperature	Move on to Step 2	Battery voltage not correct	Charge, and if necessary replace, the battery
			Alternator defective	Replace the alternator, if defective Op. 5530A10 ALTERNATOR - R+R
			Accelerator pedal potentiometer defective	Replace the accelerator pedal Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R
			Coolant temperature sensor defective	Replace the coolant temperature sensor Op. 1056B50 ENGINE COOLANT TEMPERATURE SENSOR - R + R
2	MOTORIZED THROTTLE CHECK	All OK	Problems encountered	Operation
	- Check that the motorized throttle is working properly See Test 1056BW Check on the throttle body actuator operation Check the continuity of the wiring between the engine control unit and the motorized throttle	End of diagnosis	Motorized throttle defective	Replace the motorized throttle Op. 1056B14 THROTTLE CASE - R + R
		End of diagnosis	Wiring defective	Restore correct wiring.

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