| STEP | CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK |
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| 1 | Turn the ignition key OFF.In the engine compartment junction unit, remove relay T7 (first from the top in the the left lower row)Turn the ignition key ON.Measure the voltage between Pin 86 of the base unit for relay T7 and the earth, ensuring it is less than 0.3 V.Move on to Step 4 | Move on to Step 2 |
| 2 | If faults are found, restore the wiring between the engine compartment junction unit and the engine compartment junction unit See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Replace the wiring if necessaryThe test can be considered over | Replace the junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. and move on to Step 3 |
| 3 | Check the fault disappears.The test can be considered over | Repair the original junction unit and replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R |
| 4 | Measure the voltage between Pin 87 of the base unit for relay T7 and the earth, ensuring it is less than 1.0 V.Move on to Step 15 | Move on to Step 5 |
| 5 | Turn the ignition key OFF.Disconnect the cable loom connector from the engine management control unit connector A.Turn the ignition key ON.Measure the voltage between Pin 87 of the base unit for relay T7 and the earth, ensuring it is greater than 1.0 V. | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R |
| 6 | Turn the ignition key OFF.In the engine compartment junction unit, remove relay T6 (the lower one in the middle row)Turn the ignition key ON.Measure the voltage between Pin 87 of the base unit for relay T6 and the earth, ensuring it is greater than 1.0 V. | Replace the glow plug preheating control unit Op. 5520C20 HEATER PLUGS CONTROL UNIT - R.R |
| 7 | Turn the ignition key OFF.Disconnect the wiring harness connector from the EGR solenoidTurn the ignition key ON.Measure the voltage between Pin 87 of the base unit for relay T9 and the earth, ensuring it is greater than 1.0 V. | Replace the EGR solenoid valve Op. 1080C24 E.G.R. SYSTEM SOLENOID - R + R |
| 8 | Turn the ignition key OFF.Disconnect the wiring harness connector from the built-in throttle body actuator.Turn the ignition key ON.Measure the voltage between Pin 87 of the base unit for relay T7 and the earth, ensuring it is greater than 1.0 V. | Replace the built-in throttle body actuator Op. 1060G50 THROTTLE BODY - R.R |
| 9 | Turn the ignition key OFF.Disconnect the wiring harness connector from the brake pedal switch.Turn the ignition key ON.Measure the voltage between Pin 87 of the base unit for relay T7 and the earth, ensuring it is greater than 1.0 V. | Replace the brake pedal switch Op. 1060D38 SWITCH ON BRAKE PEDAL - R.R (DIESEL ENGINES) |
| 10 | Turn the ignition key OFF.Disconnect the battery positiveTurn the ignition key ON.Measure the voltage between Pin 87 of the base unit for relay T7 and the earth, ensuring it is less than 1.0 V. | Move on to Step 12 |
| 11 | If faults are present, restore the wiring between the battery positive and the turbine variable geometry control solenoid See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Replace the wiring if necessaryThe test can be considered over | Replace the solenoid valve Op. 1064B42 SOLENOID CONTROLLING TURBOCHARGER VANE POSITION ACTUATOR - R.R |
| 12 | If faults are present, restore the wiring between the various disconnected components See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Replace the wiring if necessaryThe test can be considered over | Replace the junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| 13 | Turn the ignition key OFF.Disconnect the cable loom connector from the engine management control unit connector A.Check the resistance between Pin 85 of the base unit for relay T7 and the earth is greater than 500 kOhms.Move on to Step 17 | Move on to Step 14 |
| 14 | If faults are found, restore the wiring between the engine compartment junction unit and the engine compartment junction unit See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Replace the wiring if necessaryThe test can be considered over | Replace the junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| 15 | Check that the resistance across Pin 85 of the base of relay T7 and Pin 72 (wiring side) of control unit connector A See M010 ENGINE MANAGEMENT ECU is less than 5 OhmsMove on to Step 16 | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R |