22 · Diagnostics

Engine starts with difficulty

Make: Fiat
Model: Bravo Factory Service Manual
Year: 2007–2014
Section: Starting › Engine starts with difficulty

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Fault diagnosisEngine starts with difficulty

ENGINE STARTS WITH DIFFICULTY

1.4 16v

The engine starts with difficulty and only after repeated attempts. When the key is turned the instruments light up as normal, the starter motor turns, but the engine is difficult to start.

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
	First, check: - condition of the air filter; - the condition of the air intake circuit; - that there are no obstructions in the exhaust pipe	Move on to Step 1	Obstruction in the air intake circuit	Eliminate the problem, if necessary, replace the filter element Op. 1048A14 AIR CLEANER FILTER ELEMENT - REPLACE.
			Air intake via the intake manifold/throttle body seal	Restore the correct seal.
			Exhaust pipe blocked	Restore the operation of the exhaust pipe.
1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket and check: - that there are no faults in the engine management control unit; - parameter plausibility	End of diagnosis	Error detected in the control unit	Continue following the instructions on the diagnostic equipment
		End of diagnosis	Parameter not consistent	Continue following the instructions on the diagnostic equipment
2	FUEL PRESSURE TEST	All OK	Problems encountered	Operation
	Check the fuel supply pressure Op. 0520G46 FUEL SYSTEM - CHECK SUPPLY PRESSURE USING THE EXAMINER	Move on to Step 3	Fuel pressure too low: pipes obstructed	Eliminate the constrictions
		Move on to Step 3	Fuel pressure too low: pump defective	Replace the fuel pump assembly Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
3	IGNITION SYSTEM CHECK	All OK	Problems encountered	Operation
	Inspect the spark plugs and check their operation Check for any defects in the spark plug high voltage cables Check the operation of the ignition coils by carrying out the See Test 5510OB IGNITION COIL RESISTANCE CHECK See Test 5510CI IGNITION COIL OPERATION CHECK	Move on to Step 4	Spark plug defective	Replace spark plug Op. 5510D10 SPARK PLUGS - R+R
			High voltage cable connection leaking	Replace HV cable
			High voltage cable connection slack	Tighten HV cable correctly
			Ignition coil defective.	Replace ignition coils Op. 5510C14 IGNITION COIL/S - R.R.
4	INJECTOR CHECK	All OK	Problems encountered	Operation
	Using the Examiner in active diagnosis, check that the injectors are working properly by carrying out the See Test 1056BA Injector operation check Check that the injector needle seal is correct	Move on to Step 5	Injector stuck/incorrectly adjusted	Replace the injector Op. 1056B70 INJECTOR (ONE) - R + R WITH FUEL MANIFOLD PIPE REMOVED - INCLUDES SEAL REPLACEMNT
			Connections not correct	Restore the correct connections See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
			Injector seal not intact	Change the injectors Op. 1056B70 INJECTOR (ONE) - R + R WITH FUEL MANIFOLD PIPE REMOVED - INCLUDES SEAL REPLACEMNT
5	ENGINE TEMPERATURE SENSOR CHECK	All OK	Problems encountered	Operation
	Check that the sensor operates correctly by carrying out the See Test 1056BC Engine coolant temperature sensor operation check	Move on to Step 6	Temperature sensor defective	Replace the sensor Op. 1056B50 ENGINE COOLANT TEMPERATURE SENSOR - R + R
		Move on to Step 6	Connections not correct	Restore the correct connections See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
6	ACCELERATOR PEDAL CHECK	All OK	Problems encountered	Operation
	Check that the accelerator pedal is working correctly	Move on to Step 7	Accelerator pedal potentiometer defective.	Replace the accelerator pedal Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R
	Check that the accelerator pedal is working correctly	Move on to Step 7	Connections not correct.	Restore the correct connections See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
7	MOTORIZED THROTTLE CHECK	All OK	Problems encountered	Operation
	Check that the motorized throttle is working properly by carrying out the See Test 1056BW Check on the throttle body actuator operation	Move on to Step 8	Motorized throttle defective	Replace the motorized throttle Op. 1056B14 THROTTLE CASE - R + R
		Move on to Step 8	Connections not correct.	Restore the correct connections See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
8	TIMING CHECK	All OK	Problems encountered	Operation
	Check that the timing system timing is correct	Move on to Step 9	Timing system timing not correct	Restore the correct timing.
9	CYLINDER COMPRESSION CHECK	All OK	Problems encountered	Operation
	Carry out the cylinder compression check	Move on to Step 11	Cylinder compression insufficient	Move on to Step 10
10	CHECK ON CAUSE OF INSUFFICIENT COMPRESSION	All OK	Problems encountered	Operation
	R & R head to check valve seal Check condition of cylinders/piston rings	Move on to Step 11	Valve seal insufficient	Overhaul the head Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL
		Move on to Step 11	Cylinders/piston rings worn	Restore the correct seal.
11	ENGINE CONTROL UNIT CHECK	All OK	Problems encountered	Operation
	Check that the engine control unit is working properly	End of diagnosis	Engine management control unit defective.	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 of: Engine starting poor, the starter motor works normally.

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
		Test results
	Check that the engine oil level is correct Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY Check that the air intake/vacuum circuit is working properly See Test 1048OA AIR INTAKE/VACUUM CIRCUIT CHECK Check the condition of the fuel supply circuit and make sure that it is working properly See Test 1040OA Fuel supply circuit check	Move on to Step 1	Oil level incorrect	Restore the correct engine oil level Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY
		Move on to Step 1	Air vacuum circuit fault	Replace vacuum pump. Eliminate the air intake via the intake manifold seal or the tappet cover and engine block seal. Make sure that the engine is perfectly sealed.
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 · Target Diesel pressure · Measured Diesel pressure See Test 1060GH DIESEL PRESSURE CHECK · Atmospheric pressure See Test 1060GD ATMOSPHERIC PRESSURE CHECK · Engine rpm · Engine coolant temperature See Test 5030AA COOLANT TEMPERATURE SENSOR CHECK	Move on to Step 2
2	PARTICULATE FILTRATION SYSTEM CHECKS	All OK	Problems encountered	Operation
	Check that the DPF system is working properly See Test 1080BE PARTICLE FILTER SATURATION CHECK	Move on to Step 3	Presence of errors	Continue as described by the diagnostic equipment
3	PREHEATING RELAY ACTIVE DIAGNOSIS	All OK	Problems encountered	Operation
	Carry out the active diagnosis of the preheating relay, checking that the result is positive	Move on to Step 5	The result of the active diagnosis is negative	Move on to Step 4
4	GLOW HEATER PLUGS CHECK	All OK	Problems encountered	Operation
	Check that the glow heater plugs are working properly See Test 5520CA GLOW HEATER PLUGS OPERATION CHECK	Move on to Step 5	1.Glow heater plugs defective 2.Wiring defective 3.Preheating control unit defective 4.Engine control unit defective	1.Replace the glow heater plugs Op. 5520C10 HEATER PLUGS - R+R 2.Renew the wiring 3.Replace preheating control unit Op. 5520C20 HEATER PLUGS CONTROL UNIT - R.R 4.Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R
5	HIGH PRESSURE CHECK	All OK	Problems encountered	Operation
	Connect the diagnostic equipment to the diagnostic socket. Check that the diesel pressure parameter is correct See Test 1060OD Injector high pressure fuel circuit check	Move on to Step 6	Pressure not correct	Move on to Step 12
6	LOW RETURN PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the pressure in the return pipe to the tank is less than 1 bar See Test 1060OA Low pressure fuel return circuit check	Move on to Step 7	Pressure above the maximum limit: return pipe to the tank obstructed	Repair the pipe, if necessary, replace it
7	LOW DELIVERY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check as described in the test See Test 1060OB Low pressure fuel supply circuit check that the diesel pressure between the filter and the pressure pump is between 2 and 3 bar	Move on to Step 8	Pressure below the minimum limit or above the maximum limit	Move on to Step 11
8	LOW DELIVERY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the difference in pressure upstream and downstream of the filter is less than 1 bar	Move on to Step 9	Difference in pressure more than 1 bar	Replace the diesel filter cartridge Op. 1044B20 FUEL FILTER FILTERING ELEMENT - REPLACE
9	LOW DELIVERY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the supply pump pressure at the filter inlet is more than 2.2 bar	Move on to Step 10	Pressure below 2 bar	Move on to Step 12
10	LOW DELIVERY PRESSURE CHECK	All OK	Problems encountered	Operation
	Measure the difference in pressure between the electrical pump outlet and the filter inlet, checking that it is less than 0.3 bar	Move on to Step 11	Difference in pressure more than 0.3 bar	Replace the pipe
11	LOW DELIVERY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check as described in the test See Test 1040AA CHECK ON SUPPLY VOLTAGE AND CURRENT UPTAKE that the pump supply voltage is equal to 12V and that the current uptake is between 2 and 10 Amps	Move on to Step 13	Voltage less than 12 volt	Check electrical wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
			Current greater than 10 A: pump defective	Replace the fuel pump assembly Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
			Current less than 2 A: pump obstructed	Replace the fuel pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R and clean the fuel tank
12	CHECK CORRECT OPERATION	All OK	Problems encountered	Operation
	Replace the high pressure pump Op. 1060E10 DIESEL INJECTION PRESSURE PUMP - R.R. and check that the fault is no longer present	End of diagnosis	Fault persists	Replace the high pressure pump Op. 1060E10 DIESEL INJECTION PRESSURE PUMP - R.R.
13	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 14	Cylinder compression insufficient	Move on to Step 14
14	CHECK ON CAUSE OF INSUFFICIENT COMPRESSION	All OK	Problems encountered	Operation
	Carry out Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET to check the valve seal Check condition of cylinders/piston rings	Move on to Step 15	Valve seal insufficient	Overhaul the head Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL
		Move on to Step 15	Cylinders/piston rings worn	Restore the seal
15	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 engine starts with difficulty and only after repeated attempts. When the key is turned the instruments light up as normal, the starter motor turns, but the engine is difficult to start.

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
		Test results
	First check: air filter condition; air intake circuit condition; that the exhaust pipe is not blocked	Move on to Step 1	Obstruction in the air intake circuit	Eliminate the problem, if necessary, replace the filter element Op. 1048A14 AIR CLEANER FILTER ELEMENT - REPLACE.
			Air intake via the intake manifold/throttle body seal	Restore the correct seal.
			Exhaust pipe blocked	Restore the operation of the exhaust pipe.
1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket and check: - that there are no faults in the engine management control unit; - parameter plausibility	End of diagnosis	Error detected in the control unit	Continue following the instructions on the diagnostic equipment
		End of diagnosis	Parameter not consistent	Continue following the instructions on the diagnostic equipment
2	FUEL PRESSURE TEST	All OK	Problems encountered	Operation
	Check fuel supply pressure by carrying out the following tests: See Test 1056BY FUEL SYSTEM SUPPLY PRESSURE CHECK See Test 1056BI FUEL SYSTEM RETURN PRESSURE CHECK See Test 1040AA CHECK ON SUPPLY VOLTAGE AND CURRENT UPTAKE	Move on to Step 3	Fuel pressure too low: pipes obstructed	Eliminate the constrictions
		Move on to Step 3	Fuel pressure too low: pump defective	Replace the pump assembly Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
3	IGNITION SYSTEM CHECK	All OK	Problems encountered	Operation
	Inspect the spark plugs and check their operation Check for any defects in the spark plug high tension leads Check the operation of the ignition coils by carrying out See Test 5510OB IGNITION COIL RESISTANCE CHECK See Test 5510CI IGNITION COIL OPERATION CHECK See Test 5510CE IGNITION CONTROL SIGNAL CHECK	Move on to Step 4	Spark plug defective	Replace spark plug Op. 5510D10 SPARK PLUGS - R+R
			High voltage cable connection leaking	Replace HV cable
			High voltage cable connection slack	Tighten HV cable correctly
			Ignition coil defective.	Replace ignition coils Op. 5510C14 IGNITION COIL/S - R.R.
4	INJECTOR CHECK	All OK	Problems encountered	Operation
	Using the Examiner in active diagnosis, check that the injectors are working properly by carrying out the See Test 1056BA Injector operation check Check that the injector needle seal is correct	Move on to Step 5	Injector stuck/incorrectly adjusted	Replace the injector Op. 1056B70 INJECTOR (ONE) - R + R WITH FUEL MANIFOLD PIPE REMOVED - INCLUDES SEAL REPLACEMNT
			Connections not correct	Restore the correct connections See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
			Injector seal not intact	Replace the injectors Op. 1056B70 INJECTOR (ONE) - R + R WITH FUEL MANIFOLD PIPE REMOVED - INCLUDES SEAL REPLACEMNT
5	CHECKING THE ENGINE COOLANT TEMPERATURE SENSOR	All OK	Problems encountered	Operation
	Check that the sensor operates correctly by carrying out See Test 1056BC Engine coolant temperature sensor operation check	Move on to Step 6	Temperature sensor defective	Replace the sensor Op. 1056B50 ENGINE COOLANT TEMPERATURE SENSOR - R + R
		Move on to Step 6	Connections not correct	Restore the correct connections See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
6	ACCELERATOR PEDAL CHECK	All OK	Problems encountered	Operation
	Check that the accelerator pedal is working correctly	Move on to Step 7	Accelerator pedal potentiometer defective.	Replace the accelerator pedal Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R
	Check that the accelerator pedal is working correctly	Move on to Step 7	Connections not correct.	Restore the correct connections See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
7	MOTORIZED THROTTLE CHECK	All OK	Problems encountered	Operation
	Check that the motorized throttle is working properly by carrying out the See Test 1056BW Check on the throttle body actuator operation	Move on to Step 8	Motorized throttle defective	Replace the motorized throttle Op. 1056B14 THROTTLE CASE - R + R
		Move on to Step 8	Connections not correct.	Restore the correct connections See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
8	TIMING CHECK	All OK	Problems encountered	Operation
	Check that the timing system timing is correct	Move on to Step 9	Timing system timing not correct	Restore the correct timing.
9	CYLINDER COMPRESSION CHECK	All OK	Problems encountered	Operation
	Perform the cylinder compression test by carrying out the Op. 0510A10 CYLINDER COMPRESSION - CHECK FOR LOOSE SPARK PLUGS OR INJECTORS	Move on to Step 11	Cylinder compression insufficient	Move on to Step 10
10	CHECK ON CAUSE OF INSUFFICIENT COMPRESSION	All OK	Problems encountered	Operation
	R & R head to check valve seal Check condition of cylinders/piston rings	Move on to Step 11	Valve seal insufficient	Overhaul the head Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL
		Move on to Step 11	Cylinders/piston rings worn	Restore the correct seal.
11	ENGINE CONTROL UNIT CHECK	All OK	Problems encountered	Operation
	Check that the engine control unit is working properly	End of diagnosis	Engine management control unit defective.	Replace the engine management control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R

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