Integrated throttle body operation check
- Make
- Alfa Romeo
- Model
- 159 Factory Service Manual
- Year
- 2005–2011
- Section
- Diesel injection system › Integrated throttle body operation check
INTEGRATED THROTTLE BODY OPERATION CHECK
| 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 built-in throttle body actuator. Press the START/STOP button. Check that the voltage across pin 2 of the actuator See N075 THROTTLE BODY ACTUATOR and the earth is greater than 11 V. Move on to Step 4 | Move on to Step 2 |
| 2 | Press the START/STOP button. In the engine compartment junction unit, remove fuse F11 (third from the right in the lower row) Press the START/STOP button. Check the voltage between the inlet contact of fuse F11 and earth. Ensure it is greater than 11 V. | Replace the junction unit Op. 5505A18 |
| 3 | If faults are found, restore the wiring between the junction unit and the actuator See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Replace the wiring if necessary The test can be considered over | Replace the junction unit Op. 5505A18 |
| 4 | Check that the voltage across pin 1 and 2 of the actuator See N075 THROTTLE BODY ACTUATOR is greater than 11 V. Move on to Step 6 | Move on to Step 5 |
| 5 | If faults are found, restore the wiring between the engine control unit and the throttle body actuator See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Replace the wiring if necessary The test can be considered over | Replace the engine management control unit |
| 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 59 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 engine control unit and the throttle body actuator |
| 7 | Check that the voltage across pin 52 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 engine control unit and the throttle body actuator |
| 8 | Press the START/STOP button. Check that the voltage across pin 59 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 engine control unit and the throttle body actuator |
| 9 | Check that the voltage across pin 52 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 engine control unit and the throttle body actuator |
| 10 | Check that the voltage across pin 59 of the control unit See M010 ENGINE MANAGEMENT ECU and pin 6 of the actuator See N075 THROTTLE BODY ACTUATOR is less than 5 Ohms | Repair or if necessary replace the electrical wiring between the engine control unit and the throttle body actuator |
| 11 | Check that the voltage across pin 52 of the control unit See M010 ENGINE MANAGEMENT ECU and pin 4 of the actuator See N075 THROTTLE BODY ACTUATOR is less than 5 Ohms | Repair or if necessary replace the electrical wiring between the engine control unit and the throttle body actuator |
| 12 | Remove the throttle body. Op. 1060G50 THROTTLE BODY - R.R and check for machining swarf or dirt blocking movement of the motorised throttle | Clean the throttle body using a brush dipped in diesel to dissolve the dirt and remove any swarf |
| 13 | Replace the throttle body. Op. 1060G50 THROTTLE BODY - R.R and check the fault has disappeared | Repair the original throttle body and replace the engine control unit |
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