23 · Diagnostics

P0088 - pressure on flute

Make: Alfa Romeo
Model: 159 Factory Service Manual
Year: 2005–2011
Section: Examiner - diesel electronic management › P0088 - pressure on flute

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Fault diagnosisP0088 - pressure on flute

P0088 - PRESSURE ON FLUTE

1.9 JTD 8V, 1.9 JTD 16V, 2.4 JTD 20V

The diagnostic equipment signals: Error P0088 (Pressure at pipe)

This error is detected if the pressure of the oil in the distribution line is greater than 1.750 bar. As a result, the engine is switched off.

0	Preliminary checks	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	The fuel system is highly sensitive. The work must be carried out with the greatest cleanliness and care. Any air in the system could damage the high pressure fuel pump. The vehicle must therefore never be driven with the fuel tank empty. Check that the tank contains the correct type of fuel. The fuel reserve should be more than 5 litres. Check that there are no leaks from the fuel system. Check the hoses and pipes connected to identify any obstructions, damage, etc. Check that the connectors and seals are correctly fitted.	Move on to Step 1	1.The tank contains irregular substances (petrol, other fluids)	1.Clean the tank and refill it correctly
			2.There are less than 5 litres in the tank	2.Top up the fuel level to more than 5 litres
			3.Fuel system leaking or not correctly sealed	3.Renew the seal for the system. If necessary, replace the faulty components
			4.Pipes obstructed or damaged	4.Renew the pipes. If necessary, replace the faulty components
1	High pressure check	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the diesel pressure parameter is correct as described in the test. See Test 1060OD INSPECTION OF THE HIGH PRESSURE FUEL CIRCUIT	Move on to Step 12	Pressure not correct	Move on to Step 2
2	Injector high pressure check	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check, as described in the test, that the diesel leaks from the injector recirculation connections are small (seepage) and roughly equal to one another. See Test 1060OC INJECTORS SEAL TEST	Move on to Step 3	Significant leak from one injector	Replace the injector
3	Low return pressure check	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check, as described in the test, that the pressure in the return pipe to the tank is less than 1 bar See Test 1060OA CHECK ON RETURN LOW PRESSURE FUEL CIRCUIT	Move on to Step 4	Pressure above the maximum limit: return pipe to the tank obstructed	Repair the pipe, if necessary, replace it
4	Low supply pressure check	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check, as described in the test, that the diesel pressure between the filter and the pressure pump is between 2 and 3 bar See Test 1060OB CHECK ON SUPPLY LOW PRESSURE FUEL CIRCUIT	Move on to Step 10	Pressure below the minimum limit or above the maximum limit	Move on to Step 5
5	Low supply pressure check	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Constrict the return pipe downstream of the valve and carry out the test once again with the pipe constricted checking that the pressure at the filter outlet remains below 2 bar See Test 1060OB CHECK ON SUPPLY LOW PRESSURE FUEL CIRCUIT	Move on to Step 6	Pressure rises to 5 bar: pressure regulator valve on filter mounting incorrectly adjusted	Replace the valve Op. 1044B16
6	Low supply pressure check	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the difference in pressure upstream and downstream of the filter is less than 1 bar	Move on to Step 7	Difference in pressure more than 1 bar	Replace the fuel filter cartridge Op. 1044B20
7	Low supply pressure check	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the supply pump pressure at the filter inlet is more than 2.2 bar	Move on to Step 10	Pressure below 2.2 bar	Move on to Step 8
8	Low supply pressure check	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Measure the difference in pressure between the electric pump outlet and the filter inlet and check that it is less than 0.3 bar	Move on to Step 9	Difference in pressure more than 0.3 bar	Replace the pipe
9	Low supply pressure check	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check, as described in the test, that the pump supply voltage is equal to 12 V and that the current uptake is between 2 and 10 A See Test 1040AA SUPPLY VOLTAGE AND ABSORPTION CURRENT CHECKS	Move on to Step 10	1.Voltage lower than 12 V	1.Renew electrical wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
			2.Current greater than 10 A: pump defective	2.Replace the fuel pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
			3.Current less than 2 A: pump obstructed	3.Replace the fuel pump and clean the fuel tank Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
10	Correct operation check	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Replace the DRV high pressure regulation valve and check that the fault is no longer present. Op. 1060E50 PRESSURE REGULATOR ON PRESSURE PUMP - R.R.	End of diagnosis	The fault persists	Move on to Step 11
11	Correct operation check	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Replace the pressure pump and check that the fault is no longer present Op. 1060E10 DIESEL INJECTION PRESSURE PUMP - R.R.	End of diagnosis	The fault persists	Contact technical service for further information on the problem
12	Fuel pump relay active diganosis	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Carry out the active diagnosis of the fuel pump relay using the diagnostic equipment checking that the result is positive	Move on to Step 13	The active diagnosis not successful	Carry out the test See Test 1040AB SUBMERGED FUEL PUMP CHECK
13	Pressure regulator replacement	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Replace the fuel pressure regulator and check that the problem disappears Op. 1060E50 PRESSURE REGULATOR ON PRESSURE PUMP - R.R.	Move on to Step 14	The fault persists	Renew the pressure regulator and replace the flow valve Op. 1060E20
14	Correct operation check	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Replace the engine management control unit and check that the fault is no longer present Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R	End of diagnosis	The fault persists	Contact technical service for further information on the problem

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