22 · Diagnostics

Engine idling too low

Make: Fiat
Model: Bravo Factory Service Manual
Year: 2007–2014
Section: Engine › Engine idling too low

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Fault diagnosisEngine idling too low

ENGINE IDLING TOO LOW

1.4 16v

The customer complains that: Engine idle speed is too low

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	Move on to Step 2	Battery voltage low	Recharge/replace battery
		Move on to Step 2	Accelerator pedal potentiometers defective	Replace the accelerator pedal Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R
2	MOTORIZED THROTTLE CHECK	All OK	Problems encountered	Operation
	- Check that the motorized throttle is working properly, carrying out the See Test 1056BW Check on the throttle body actuator operation	Move on to Step 3	Motorized throttle defective	Replace the motorized throttle Op. 1056B14 THROTTLE CASE - R + R
		Move on to Step 3	Wiring defective	Restore correct wiring.
3	CYLINDER COMPRESSION CHECK	All OK	Problems encountered	Operation
	Carry out the cylinder compression check Op. 0520G15 COMPRESSION TEST - CHECK WITH EXAMINER WITH SPARK PLUGS/INJECTORS REMOVED	Move on to Step 4	Cylinder compression insufficient	Move on to Step 5
4	CHECK THE CAUSE OF THE INSUFFICIENT COMPRESSION	All OK	Problems encountered	Operation
	Carry out Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET to check the valve seal and the condition of the cylinders/piston rings	Move on to Step 5	Valve seal insufficient	Overhaul the cylinder head [PR_1016E10] Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL
5	CORRECT OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Replace the engine management control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R

1.9 JTD 8v, 1.9 JTD 16v

The customer complains that: Engine idle speed is too low

1	MODE PARAMETERS CHECK	All OK	Problems encountered	Operation
		Test results
	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 · Engine rpm · Target Diesel pressure · Measured Diesel pressure See Test 1060GH DIESEL PRESSURE CHECK	Move on to Step 2
2	CONFIGURATION TESTS	All OK	Problems encountered	Operation
	Select the following control unit at the diagnostic equipment: EDC16C39 Diesel electronic injection control unit. Check in the Configurations section whether the replacement of any of the following components is followed by their subsequent configuration: · Air flow meter · Fuel pressure sensor · Injector · Differential pressure sensor on the catalytic converter · Lambda sensor · Main catalytic converter with particulate filter · Pre-converter In this case, carry out the configuration, checking that the outcome is positive	Move on to Step 4	The outcome of the configuration is not positive	Move on to Step 3
3	CONFIGURATION REPETITION	All OK	Problems encountered	Operation
	Repeat the configuration, checking that the outcome is positive this time	Move on to Step 4	The outcome of the configuration is not positive	Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R
4	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Carry out the active diagnosis for the E.G.R. solenoid	Move on to Step 5	Solenoid not working	Restore the wiring continuity See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Replace the solenoid if necessary Op. 1080C24 E.G.R. SYSTEM SOLENOID - R + R
5	FUEL FILTER CHECK	All OK	Problems encountered	Operation
	Check fuel filter operation, carrying out the See T CHECK ON CHANGE IN PRESSURE AT THE FUEL FILTER	Move on to Step 6	Fuel filter operation not correct	Replace the fuel filter Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE
6	CYLINDER COMPRESSION CHECK	All OK	Problems encountered	Operation
	Carry out the cylinder compression check Op. 0520G15 COMPRESSION TEST - CHECK WITH EXAMINER WITH SPARK PLUGS/INJECTORS REMOVED	Move on to Step 8	Cylinder compression insufficient	Move on to Step 7
7	CHECK THE CAUSE OF THE INSUFFICIENT COMPRESSION	All OK	Problems encountered	Operation
	Carry out Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET to check the valve seal and the condition of the cylinders/piston rings	Move on to Step 8	Valve seal insufficient	Overhaul the cylinder head Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL
8	CORRECT OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R

1.4 16v TJet

The customer complains that: Engine idle speed is too low

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	Move on to Step 2	Battery voltage low	Recharge/replace battery
		Move on to Step 2	Accelerator pedal potentiometers defective	Replace the accelerator pedal Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R
2	MOTORIZED THROTTLE CHECK	All OK	Problems encountered	Operation
	Check that the motorized throttle is working properly, carrying out 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	Move on to Step 3	Motorized throttle defective	Replace the motorized throttle Op. 1056B14 THROTTLE CASE - R + R
		Move on to Step 3	Wiring defective	Restore correct wiring.
3	CYLINDER COMPRESSION CHECK	All OK	Problems encountered	Operation
	Carry out the cylinder compression check Op. 0520G15 COMPRESSION TEST - CHECK WITH EXAMINER WITH SPARK PLUGS/INJECTORS REMOVED	Move on to Step 5	Cylinder compression insufficient	Move on to Step 4
4	CHECK THE CAUSE OF THE INSUFFICIENT COMPRESSION	All OK	Problems encountered	Operation
	Carry out Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET to check the valve seal and the condition of the cylinders/piston rings	Move on to Step 5	Valve seal insufficient	Overhaul the cylinder head Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL
5	CORRECT OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Replace the engine management 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 Bravo

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