| CHECK TO BE PERFORMED | RESOLUTION IF THE CHECK IS NOT OK |
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| 1 | Turn the ignition key OFF.Disconnect the cable loom from the lambda sensor.In the engine bay junction unit, remove relay T6 (it is the first at the bottom in the middle row).Connect a shunt cable with a fuse between across pin 87 of the base unit for relay T6 and the battery positive.check that the voltage between Pin 4 (wiring side) of the sensor and earth is greater than 11 V. See K040 LAMBDA SENSORMove on to Step 3 | Move on to Step 2 |
| 2 | If faults are found, repair or replace the wiring between the engine control unit, the engine compartment junction unit and the lambda sensor See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT The test can be considered over | Replace the junction unitOp. 5505A13 |
| 3 | Disconnect the shunt connection with fuse.Disconnect the wiring harness connector from engine control unit connector BTurn the ignition key ON.Measure the voltage between Pin 3 (wiring side) of the sensor and earth is less than 0.3 V. See K040 LAMBDA SENSOR | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| 4 | Turn the ignition key OFF.Check that the resistance between Pin 3 (wiring side) of the sensor and earth is greater than 500 kOhms See K040 LAMBDA SENSOR | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| 5 | Measure the resistance between Pin 3 (wiring side) of the sensor and Pin 12 (wiring side) of the control unit is less than 5 Ohms See K040 LAMBDA SENSOR See M010 ENGINE MANAGEMENT ECU | Repair or if necessary replace the electrical wiring between the engine management control unit and the lambda sensor. See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| 6 | Check that the resistance between Pins 3 and 4 (wiring side) of the sensor are between 1 and 20 Ohms See K040 LAMBDA SENSOR | Replace the Lambda sensor Op. 1080B90 LAMBDA SENSOR - R.R. |
| 7 | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R | |