B013 ENGINE STARTS WITH DIFFICULTY - Fiat - NUOVA 500 - eLearn

312000551 - B013 ENGINE STARTS WITH DIFFICULTY

The engine, particularly when cold, 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
	Check: That the level of the oil is correct The condition of the air intake/vacuum circuit The condition of the fuel supply circuit and make sure that it is working properly Battery earth lead connection	Move on to Step 1	1. Oil level incorrect2. Fault in the air intake circuit3. Leaks from the diesel pipes4. Filter blocked5. Water, petrol, paraffin or dirt found to be present6. Battery earth lead slack/oxidized	1. Restore the correct engine oil level Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY 2. Renew the air intake circuit3. Adjust pipe tightness to correct setting and replace if necessary4. Replace the diesel filter cartridge Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE 5. Clean the tank and pipes and replace the diesel filter cartridge Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE 6. Restore the battery earth lead connection
1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the Examiner diagnostic equipment to the diagnostic connector and check the following at the engine management control unit. Check the value of the following parameters: Battery voltage Measured diesel pressure Target diesel pressure Correct operation of the diesel preheating system	Move on to Step 2	1. Battery voltage low2. The pressure measured does not correspond to the target figure3. Heater plugs circuit faulty	1. Recharge and, if necessary, replace the battery2. Move on to Step 33. Move on to Step 2
2	PREHEATING SYSTEM CHECK	All OK	Problems encountered	Operation
	Carry out the active diagnosis for the diesel preheating relay, checking that the result is positive.Check that the heater plugs and the preheating system are working properly, by carrying out theSee Test	Move on to Step 3	1. Preheating wiring faulty2. Preheating control unit defective3. Heater plugs faulty	1. Restore wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT 2. Replace preheating control unit Op. 5520C20 HEATER PLUGS CONTROL UNIT - R.R 3. Replace defective heater plugs Op. 5520C10 HEATER PLUGS - R+R
3	HIGH PRESSURE CHECK	All OK	Problems encountered	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.Check that the diesel pressure parameter is correct by carrying out the See Test 1060OD HIGH PRESSURE FUEL CIRCUIT CHECK	Move on to Step 12	Pressure not correct	Move on to Step 4
4	LOW RETURN PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the pressure in the return pipe to the tank is correct by carrying out the See Test 1060OA LOW FUEL RETURN PRESSURE CIRCUIT CHECK	Move on to Step 5	Pressure above the maximum limit: return pipe to the tank obstructed	Repair the pipe and replace if necessary
5	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the diesel pressure between the filter and the low pressure pump is correct by carrying out the See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECK	Move on to Step 11	Pressure below the minimum limit or above the maximum limit	Move on to Step 6
6	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the difference in pressure upstream and downstream of the filter is less than 1 bar by carrying out theSee Test	Move on to Step 7	Difference in pressure more than 1 bar	Replace the diesel filter cartridge Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE
7	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Measure the difference in pressure between the electric pump outlet and the filter inlet and check that it is more than 0.5 bar	Move on to Step 8	Difference in pressure more than 0.5 bar	Replace the pipe
8	ELECTRIC PUMP CHECK	All OK	Problems encountered	Operation
	Check that the pump supply voltage is correct.Check that the pump absorption current is correct by carrying out theSee Test 1040AA SUPPLY VOLTAGE AND ABSORPTION CURRENT CHECKS	Move on to Step 9	Current greater than 10 Amps: pump defective	Replace the fuel pump assembly Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
9	CORRECT OPERATION CHECK	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	The fault persists	Move on to Step 12
10	CYLINDER COMPRESSION CHECK	All OK	Problems encountered	Operation
	Carry out the cylinder compression checkOp. 0520G15	Move on to Step 12	Cylinder compression insufficient	Move on to Step 11
11	CHECK ON CAUSE OF INSUFFICIENT COMPRESSION	All OK	Problems encountered	Operation
	R/R head for valve leakage testCheck condition of cylinders/piston rings	Move on to Step 12	1. Valve seal insufficient2. Cylinders/piston rings worn	1. Overhaul the head2. Restore the correct seal.
12	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. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R