| 1 | Rpm signal checkPrepare the diagnostic equipment to download a voltage graph.Select the VOLTMETER function from the INSTRUMENT menu with the timebase set at 5 secondsDisconnect the connector for the control unit side sensor wiring and leave it disconnected.Connect the probes between pins 1 and 2 of the sensor.Press the START button on the diagnostic equipment to begin downloading a graph.Crank the engine for at least 5 seconds at around 400 rpm and check that the signal amplitude is more than 1.5 V and conforms to the attached graph. | Check that the rpm sensor is positioned correctlyReplace the rpm sensor if it is defective Op. 1060G20 ENGINE RPM SENSOR - R.R. If the signal is OK, check the continuity/insulation of the wiring between the sensor and engine control unit.Check that the gap between the sensor and phonic wheel is between 0.5 and 1.5 mm. If it is not OK, restore the correct distanceIf OK, replace the engine control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R |
