08 · Engine

Engine speed check

Make: Fiat
Model: 500 Factory Service Manual
Year: 2007–2024
Section: Diesel injection system › Engine speed check

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EngineEngine speed check

ENGINE SPEED CHECK

Check 1060GI

1.3 Multijet

STEP	CHECK TO BE PERFORMED	REMEDIAL ACTION IF THE CHECK IS NOT OK
1	Rpm signal check Prepare the diagnostic equipment to download a voltage graph. Select the VOLTMETER function from the INSTRUMENT menu with the timebase set at 5 seconds Disconnect 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 correctly Replace 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 distance If OK, replace the engine control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R

STEP

CHECK TO BE PERFORMED

REMEDIAL ACTION IF THE CHECK IS NOT OK

Rpm signal check

Prepare the diagnostic equipment to download a voltage graph.

Select the VOLTMETER function from the INSTRUMENT menu with the timebase set at 5 seconds

Disconnect 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 correctly

Replace 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 distance

If OK, replace the engine control unit

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