194002945 - Y105 P0238 - TURBO PRESSURE

The diagnostic equipment signals: Error P0237 (Turbo pressure)
This error is detected if the difference between the actual distribution line oil pressure and the nominal pressure is more than 250 bar for at least 2 secs.
0PRELIMINARY CHECKSALL OKPROBLEMS ENCOUNTEREDACTION
Check that the engine oil level is correct    Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARYCheck that the air intake/vacuum circuit is working properly by carrying out the    See Test 1048OA AIR INTAKE/VACUUM CIRCUIT CHECKCheck the condition of the fuel supply circuit and make sure that it is working properly carrying out the    See Test 1040OA FUEL SUPPLY CIRCUIT CHECKVisually inspect the condition of:

  • High pressure fuel pump

  • Injector pipe

  • Fuel pressure sensor on the rail

  • Fuel pressure regulator

  • Fuel shutter solenoid valve

  • Injectors
Move on to Step 11. Oil level incorrect1. Restore the correct engine oil level    Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY
2. Components visually faulty2. Repair or, if necessary, replace the faulty components
1IMA INJECTOR CLASSIFICATION CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the injectors have the correct IMA classification using the diagnostic equipment. If not, carry out the programming and check that the result is positiveMove on to Step 2The programming is not successfulReplace the engine management control unit    Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R
2HIGH PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the diesel pressure parameter is correct.    See Test 1060OD INSPECTION OF THE HIGH PRESSURE FUEL CIRCUITMove on to Step 13Pressure not correctMove on to Step 3
3INJECTOR HIGH PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the diesel leaks from the injector recirculation connections are small (seepage) and roughly equal to one another.    See Test 1060OC INJECTORS SEAL TESTMove on to Step 4Significant leak from one injectorReplace the injector
4LOW RETURN PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the pressure in the return pipe to the tank is less than 1 bar    See Test 1060OA CHECK ON RETURN LOW PRESSURE FUEL CIRCUITMove on to Step 5Pressure above the maximum limit: return pipe to the tank obstructedRepair the pipe, if necessary, replace it
5LOW SUPPLY PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check 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 CIRCUITMove on to Step 11Pressure below the minimum limit or above the maximum limitMove on to Step 6
6LOW SUPPLY PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Constrict the return pipe downstream of the valve and carry out the test again    See Test 1060OB CHECK ON SUPPLY LOW PRESSURE FUEL CIRCUITwith the pipe constricted checking that the pressure at the filter outlet remains below 2 barMove on to Step 7Pressure rises to 5 bar: pressure regulator valve on filter mounting incorrectly adjustedReplace the valveOp. 1044B16 FUEL SUPPLY/RETURN REGULATION VALVE ON FUEL FILTER - R.R.
7LOW SUPPLY PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the difference in pressure upstream and downstream of the filter is less than 1 barMove on to Step 8Difference in pressure more than 1 barReplace the fuel filter cartridge    Op. 1044B20 FUEL FILTER FILTERING ELEMENT - REPLACE
8LOW SUPPLY PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the supply pump pressure at the filter inlet is more than 2.2 barMove on to Step 11Pressure below 2.2 barMove on to Step 9
9LOW SUPPLY PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Measure the difference in pressure between the electric pump outlet and the filter inlet and check that it is less than 0.3 barMove on to Step 10Difference in pressure more than 0.3 barReplace the pipe
10LOW SUPPLY PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the pump supply voltage is equal to 12V and that the current uptake is between 2 and 10 A    See Test 1040AA SUPPLY VOLTAGE AND ABSORPTION CURRENT CHECKSMove on to Step 111. Voltage lower than 12 V1. Renew electrical wiring    See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
2. Current greater than 10 A: pump defective2. Replace the fuel pump
3. Current less than 2 A: pump obstructed3. Replace the fuel pump and clean the fuel tank
11CHECK ON CORRECT OPERATIONALL OKPROBLEMS ENCOUNTEREDACTION
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 diagnosisThe fault persistsMove on to Step 12
12CHECK ON CORRECT OPERATIONALL OKPROBLEMS ENCOUNTEREDACTION
Replace the pressure pump and check that the fault is no longer present    Op. 1060E10 DIESEL INJECTION PRESSURE PUMP - R.R.End of diagnosisThe fault persistsContact the Service Department for further information on the problem
13PRESSURE REGULATOR REPLACEMENTALL OKPROBLEMS ENCOUNTEREDACTION
Replace the fuel pressure regulator and check that the problem disappears    Op. 1060E50 PRESSURE REGULATOR ON PRESSURE PUMP - R.R.Move on to Step 14The fault persistsRenew the pressure regulator and replace the flow valveOp. 1060E20 FUEL -R.R. CUT-OFF SOLENOID VALVE
14CHECK ON CORRECT OPERATIONALL OKPROBLEMS ENCOUNTEREDACTION
Replace the engine management control unit and check that the fault is no longer present    Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .REnd of diagnosisThe fault persistsContact the Service Department for further information on the problem