| 1 | Check for break in electrical power supply circuit | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Press the START/STOP button and turn off the engine.Disconnect the cable loom connector from the flow modifying solenoid valve See L064 FLOW MODIFYING SOLENOID VALVEPress the START/STOP button.Measure the voltage between Pin 1 (wiring side) of the solenoid valve and earth, checking that it is more than 11 V See L064 FLOW MODIFYING SOLENOID VALVE | Move on to Step 2 | Voltage lower than 11 V | Move on to Step 6 |
| 2 | Check insulation to +Vbatt of signal electrical circuit | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Press the START/STOP button.Disconnect the cable loom connector from Connector B of the engine management control unit See M010 ENGINE MANAGEMENT ECU Press the START/STOP button.Measure the voltage between Pin 2 (wiring side) of the solenoid valve and earth, checking that it is less than 0.3 V See L064 FLOW MODIFYING SOLENOID VALVE | Move on to Step 3 | Short circuit to +Vbatt between flow valve and engine management control unit | Restore correct electrical connections.Replace the wiring if necessary |
| 3 | Check insulation to earth of signal electrical circuit | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Press the START/STOP button.Measure the resistance between Pin 2 (wiring side) of the solenoid valve and earth, checking that it is more than 500 kOhm See L064 FLOW MODIFYING SOLENOID VALVE | Move on to Step 4 | Short circuit to earth between flow valve and engine management control unit | Restore correct electrical connections.Replace the wiring if necessary |
| 4 | Check on continuity of signal electrical circuit | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Measure the resistance between Pin 2 (wiring side) of the solenoid valve and Pin 6 (wiring side) of Connector B of the junction unit, checking that it is less than 5 Ohm See L064 FLOW MODIFYING SOLENOID VALVE See M010 ENGINE MANAGEMENT ECU | Move on to Step 5 | Open circuit between flow valve and engine management control unit | Restore correct electrical connections.Replace the wiring if necessary |
| 5 | Replacement of flow valve | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Replace the flow valve and check that the problem disappearsOp. 1060E20 | End of diagnosis | The fault persists | Restore the original solenoid valve and replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R |
| 6 | Check for break in electrical power supply circuit | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Press the START/STOP button.Disconnect the cable loom connector from Connector A of the engine management control unit. See M010 ENGINE MANAGEMENT ECU Extract the relay T9 from the socket in the engine compartment junction unit. See B001 JUNCTION UNIT Connect a bridge with a fuse to Pins 87 and 30 of the socket for relay T9.Measure the voltage between Pin 72 Connector A (wiring side) of the control unit and earth, checking that it is more than 11 V See M010 ENGINE MANAGEMENT ECU | Move on to Step 7 | Open circuit between engine compartment junction unit and engine management control unit | Restore correct electrical connections.Replace the wiring if necessary |
| 7 | Restore electrical connections | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| If the wiring between the control unit and the solenoid valve is faulty, restore the correct connections See M010 ENGINE MANAGEMENT ECU See L064 FLOW MODIFYING SOLENOID VALVE | End of diagnosis | The wiring is not faulty | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R |
