Check engine control unit connections
- Make
- Alfa Romeo
- Model
- 159 Factory Service Manual
- Year
- 2005–2011
- Section
- Diesel injection system › Check engine control unit connections
CHECK ENGINE CONTROL UNIT CONNECTIONS
| STEP | CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK |
|---|---|---|
| 1 | Press the START/STOP button and turn off the engine. Disconnect the wiring harness connector from the fuel pressure sensor. Press the START/STOP button. Select the following system on the diagnostic equipment: Diesel EDC16C39 electronic injection system. Check that error P0651 – Power supply to sensors 2 is “Present”. Move on to Step 5 | Move on to Step 2 |
| 2 | Press the START/STOP button. Disconnect the wiring harness connector from engine control unit connector B Press the START/STOP button. Check that the voltage across pin 43 of the control unit See M010 ENGINE MANAGEMENT ECU and the earth is greater than 0.3 V. | Repair or if necessary replace the electrical wiring between the fuel pressure sensor and the engine control unit |
| 3 | Check that the voltage across pin 8 of the control unit See M010 ENGINE MANAGEMENT ECU and the earth is greater than 0.3 V. | Repair or if necessary replace the electrical wiring between the fuel pressure sensor and the engine control unit |
| 4 | Replace the fuel pressure sensor Op. 1060G28 FUEL PRESSURE SENSOR ON FUEL MANIFOLD TO INJECTORS - R.R The test can be considered over | |
| 5 | Press the START/STOP button. Disconnect the wiring harness connector from the air temperature/pressure sensor. Press the START/STOP button. Select the following system on the diagnostic equipment: Diesel EDC16C39 electronic injection system. Check that error P0651 – Power supply to sensors 2 is “Present”. Move on to Step 9 | Move on to Step 6 |
| 6 | Press the START/STOP button. Disconnect the wiring harness connector from engine control unit connector B Press the START/STOP button. Check that the voltage across pin 40 of the control unit See M010 ENGINE MANAGEMENT ECU and the earth is greater than 0.3 V. | Repair or if necessary replace the electrical wiring between the air pressure/temperature sensor and the engine control unit |
| 7 | Check that the voltage across pin 23 of the control unit See M010 ENGINE MANAGEMENT ECU and the earth is greater than 0.3 V. | Repair or if necessary replace the electrical wiring between the air pressure/temperature sensor and the engine control unit |
| 8 | Replace the air temperature/pressure sensor Op. 1060G16 PRESSURE RELIEF SENSOR - R.R. The test can be considered over | |
| 9 | Press the START/STOP button. Disconnect the wiring harness connector from the accelerator pedal potentiometer Press the START/STOP button. Select the following system on the diagnostic equipment: Diesel EDC16C39 electronic injection system. Check that error P0651 – Power supply to sensors 2 is “Present”. Move on to Step 13 | Move on to Step 10 |
| 10 | Press the START/STOP button. Disconnect the cable loom connector from control unit connector A Press the START/STOP button. Check that the voltage across pin 31 of the control unit See M010 ENGINE MANAGEMENT ECU and the earth is greater than 0.3 V. | Repair or if necessary replace the electrical wiring between the accelerator pedal potentiometer and the engine control unit |
| 11 | Check that the voltage across pin 8 of the control unit See M010 ENGINE MANAGEMENT ECU and the earth is greater than 0.3 V. | Repair or if necessary replace the electrical wiring between the accelerator pedal potentiometer and the engine control unit |
| 12 | Replace the accelerator pedal Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R and check the fault has disappeared. The test can be considered over | Repair the original accelerator pedal and replace the engine management control unit. |
| 13 | Press the START/STOP button. Disconnect the wiring harness connector from engine control unit connector B Press the START/STOP button. Check that the voltage across pin 28 of the control unit See M010 ENGINE MANAGEMENT ECU and the earth is greater than 0.3 V. | Repair or if necessary replace the electrical wiring between the fuel pressure sensor and the engine control unit |
| 14 | Press the START/STOP button. Check that the voltage across pin 28 of the control unit See M010 ENGINE MANAGEMENT ECU and the earth is more than 500 kOhm. | Repair or if necessary replace the electrical wiring between the fuel pressure sensor and the engine control unit |
| 15 | Disconnect the cable loom connector from control unit connector A Press the START/STOP button. Check that the voltage across pin 46 of the control unit See M010 ENGINE MANAGEMENT ECU and the earth is greater than 0.3 V. | Repair or if necessary replace the electrical wiring between the accelerator pedal potentiometer and the engine control unit |
| 16 | Press the START/STOP button. Check that the voltage across pin 46 of the control unit See M010 ENGINE MANAGEMENT ECU and the earth is more than 500 kOhm. | Repair or if necessary replace the electrical wiring between the accelerator pedal potentiometer and the engine control unit |
| 17 | Disconnect the cable loom connector from control unit connector B Press the START/STOP button. Check that the voltage across pin 13 of the control unit See M010 ENGINE MANAGEMENT ECU and the earth is greater than 0.3 V. | Repair or if necessary replace the electrical wiring between the air pressure/temperature sensor and the engine control unit |
| 18 | Check that the voltage across pin 13 of the control unit See M010 ENGINE MANAGEMENT ECU and the earth is more than 500 kOhm. | Repair or if necessary replace the electrical wiring between the air pressure/temperature sensor and the engine control unit |
| 19 | Replace the engine management control unit |
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