Earth voltage check

Turn the key to the MAR position

Using the voltmeter connect the negative probe at pin 2 of the sensor and the positive probe to the battery positive and check for a voltage of around 5 Volts

Move on to Step 2

Restore the electrical continuity of the cable between the engine control unit and the sensor. If Ok

Replace the engine control unit

Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R

Power supply check

Turn the key to the MAR position and, using the voltmeter, check for a voltage of around 5 Volts between pin 1 and the earth

Move on to Step 3

Restore the electrical continuity of the cable between the engine control unit and the sensor. If Ok

Replace the engine control unit

Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R

Pressure signal check

Connect the wiring to the sensor

Check between pin 3 and the earth for a voltage signal dependent on the pressure, as illustrated in the attached graph

Replace the pressure sensor

Op. 1060G16 EXCESS PRESSURE SENSOR - R.R.

Restore the electrical continuity of the cable coming from the engine control unit

See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT

If the check is OK

Replace the engine management control unit

Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R