Integrated throttle body operation check
- Make
- Fiat
- Model
- Croma Factory Service Manual
- Year
- 2005–2010
- 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 | Turn the ignition key OFF. Disconnect the cable loom connector from the built-in throttle body actuator. Turn the ignition key ON. Check that the voltage between 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 | Turn the ignition key OFF. In the engine compartment junction unit, remove fuse F11 (third from the right in the lower row) Turn the ignition key ON. Check the voltage between the inlet contact of fuse F11 and earth. Ensure it is greater than 11 V. | Replace the junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| 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. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| 4 | Check that the voltage between pins 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 | Turn the ignition key OFF. Disconnect the cable loom connector from engine management control unit connector B Turn the ignition key ON. Check that the voltage between pin 59 of the control unit See M010 ENGINE MANAGEMENT CONTROL UNIT 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 between pin 52 of the control unit See M010 ENGINE MANAGEMENT CONTROL UNIT 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 | Turn the ignition key OFF. Check that the voltage between pin 59 of the control unit See M010 ENGINE MANAGEMENT CONTROL UNIT 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 between pin 52 of the control unit See M010 ENGINE MANAGEMENT CONTROL UNIT 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 between pin 59 of the control unit See M010 ENGINE MANAGEMENT CONTROL UNIT and pin 6 of the actuator See N075 INTEGRATED THROTTLE CASING ACTUATOR is less than 5 Ohm | Repair or if necessary replace the electrical wiring between the engine control unit and the throttle body actuator |
| 11 | Check that the resistance between pin 52 of the control unit See M010 ENGINE MANAGEMENT CONTROL UNIT and pin 4 of the actuator See N075 INTEGRATED THROTTLE CASING ACTUATOR is less than 5 Ohm | 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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