| 1 | Check for break in electrical power supply circuit | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Turn the ignition key to the OFF position.Disconnect the cable loom connector from the flow modifying solenoid valve. See L064 FLOW MODIFYING SOLENOID VALVETurn the ignition key to the ON position.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 |
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| Turn the ignition key to the OFF position.Disconnect the cable loom connector from Connector B of the engine management control unit. See M010 ENGINE MANAGEMENT ECUTurn the ignition key to the ON position.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 |
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| Turn the ignition key to the OFF position.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 |
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| Replace the flow valve and check that the problem disappears Op. 1072B60 THROTTLE SHAFT CONTROL VALVE FOR INLET PORTS R R | 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 |
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| Turn the ignition key to the OFF position.Disconnect the cable loom connector from Connector A of the engine management control unit. See M010 ENGINE MANAGEMENT ECUExtract the relay T9 from the socket in the engine compartment junction unit. See B001 IGNITION SWITCH NOT WORKINGConnect 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 |
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| 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 |
