B13 ENGINE STARTS WITH DIFFICULTY' - Fiat - IDEA - eLearn

2398733 - B13 ENGINE STARTS WITH DIFFICULTY'

The engine, especially when cold, starts with difficulty only after repeated attempts. When the key is turned, the instruments light up as normal, the starter motor turns, but the engine has difficulty in starting.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check, in order: that there are no obstructions in the air filter; the condition of the air intake circuit seal of the diesel pipes; that there is no petrol, water, paraffin or dirt in the diesel filter the correct operation of the exhaust pipes the condition of the wiring and operation of the pre-heating system (heater plugs)	Continue to Step 1	Air intake circuit component damaged	Repair or replace the defective component
			Air filter blocked	Replace the air filter Op. 1048A10
			Leaks from the diesel pipes	Retighten the pipes, and if necessary replace them.
			Presence of water, petrol, paraffin or dirt detected	Clean the tank and pipes and replace the diesel filter cartridge Op. 1044B20
			Obstruction in the exhaust system	Replace the damaged system component
			Pre-heating wiring faulty	Renew the wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
			Heater plugs faulty	Replace damaged heater plugs
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the Examiner diagnostic equipment to the diagnostic socket.Check that there are no errors in the control unit	Continue to Step 2	Presence of error P0093	Continue to Step 2
			Simultaneous presence of errors P1191 and P1197	Continue to Step 4
			Simultaneous presence of errors P1194 and P1197	Continue to Step 4
			Presence of error P1191	Continue to Step 3
			Presence of error P1194	Continue to Step 3
			Presence of other errors	Continue according to the instructions for the diagnostic equipment
2	HIGH PRESSURE CIRCUIT CHECK	All OK	Problems met	Operation
	Check the condition of and that there are no leaks from the rail, the radial jet pump, the injector pipes and all the high pressure lines.	Continue to Step 3	There are leaks	Eliminate leaks from the system
3	HIGH PRESSURE CHECK	All OK	Problems met	Operation
	Connect the Examiner diagnostic equipment to the diagnostic socket. Check: as described in the test See Test 1060D Check high pressure fuel circuit that the diesel pressure parameter is correct; the operation of the rail high pressure sensor by carrying out the test See Test 1060GE Check on operation of diesel high pressure sensor the operation of the pressure regulator through active diagnosis.	Continue to Step 11	Sensor faulty	Replace sensor Op. 1060G28
			Pressure regulator faulty	Replace the pressure regulator
			Pressure not correct	Continue to Step 4
4	DELIVERY PRESSURE CHECK	All OK	Problems met	Operation
	Check as described in the test See Test 1060A Low return fuel pressure circuit check that the pressure in the return pipe to the tank is under 1 bar	Continue to Step 5	Pressure above maximum limit: return pipe to tank blocked	Repair the pipe; if necessary replace it
5	LOW SUPPLY PRESSURE CHECK	All OK	Problems met	Operation
	Check as described in the test See Test 1060B Low fuel pressure supply circuit check that the diesel pressure between the filter and pressure pump is between 2 and 3 bar	Continue to Step 11	Pressure below minimum limit or above maximum limit	Continue to Step 6
6	LOW SUPPLY PRESSURE CHECK	All OK	Problems met	Operation
	Close the return pipe downstream of the low pressure regulator valve, located in the fuel filter cover, using the special tool and carry out the test See Test 1060B Low fuel pressure supply circuit check again with the pipe closed, checking that the filter outlet pressure remains below 2 bar	Continue to Step 7	Pressure rises to 5 bar: blocked pressure regulation valve on filter support	Replace the diesel filter cover
7	LOW SUPPLY PRESSURE CHECK	All OK	Problems met	Operation
	Check that the difference in pressure upstream and downstream of the filter is less than 1 bar	Continue to Step 8	Difference in pressure greater than 1 bar	Replace the diesel filter cartridge
8	LOW SUPPLY PRESSURE CHECK	All OK	Problems met	Operation
	Check that the supply pump pressure at the filter inlet is over 2.2 bar	Continue to Step 11	Pressure below 2 bar	Continue to Step 9
9	LOW SUPPLY PRESSURE CHECK	All OK	Problems met	Operation
	Measure the difference in pressure between electric pump outlet and filter inlet, checking that it is less than 0.3 bar	Continue to Step 10	Difference in pressure greater than 0.3 bar	Replace the pipe
10	LOW SUPPLY PRESSURE CHECK	All OK	Problems met	Operation
	Check as described in the test See Test 1040AA Check supply voltage' and absorption current' that the pump's supply voltage is 13V and that the absorbed current is less than or equal to 4.6 amps	Continue to Step 11	Voltage below 12 V	Check electric wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
		Continue to Step 11	Current greater than 4.6 amps: pump faulty	Replace the fuel pump assembly Op. 1040A70
11	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Replace the high pressure regulator and check that the fault is no longer present	End of diagnosis	Fault persists	Continue to Step 12
12	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Replace the pressure pump and check that the fault is no longer present	End of diagnosis	Fault persists	Continue to Step 13
13	CHECK ON CYLINDER COMPRESSION	All OK	Problems met	Operation
	Carry out the cylinder compression test	Continue to Step 15	Cylinder compression insufficient	Continue to Step 14
14	CHECK ON CAUSE OF INSUFFICIENT COMPRESSION	All OK	Problems met	Operation
	Carry out R.R. on head to check the valve sealCheck the condition of the cylinders/piston rings	Continue to Step 15	Insufficient valve seal	Overhaul the cylinder head Op. 1016E10
		Continue to Step 15	Cylinders/piston rings worn	Repair the leak
15	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists: control unit faulty	Replace engine management control unit Op. 1060G80