Group 23 EMS 2
Electrical fault tracing
Check of combination sensor, oil pressure/oil temperature
Check of sensor, coolant level
Check of oil pressure function
1.
1.
Turn off engine
2.
Disconnect the oil pressure sensor connector block and connect the 4-pin adapter 9998534 between the oil pressure sensor’s connector unit and the engine cable harness. Then connect multimeter 9510060 between measurement points 1–4.
3.
Turn on the control voltage.
4.
Measure with the multimeter set to voltage measurement. Check that the multimeter shows 5.0 volt.
5.
Now connect the multimeter between measurement points 2–4. The voltage should be approx 0.5 V at normal atmospheric pressure.
Check of oil temperature function 1.
Detach the connector to the oil pressure sensor.
2.
Connect the 4-pin adapter 9998534 between the oil pressure sensors connector block and multimeter 9510060.
3.
Measure with multimeter 9510060 set to resistance measurement between the adapter’s measurement points 3–4. The multimeter should show the following value: ~3000 Ω
10 °C
~1900 Ω
20° C
~1200 Ω
30 °C
~100 Ω
100 °C
NOTE: Even if the resistance values in the table above are met, this is no guarantee that the sensor is not faulty.
50
Empty the expansion tank from coolant. Warning! NEVER open the expansion tank pressure cap when the engine is hot, hot coolant can be sprayed out and cause severe burns.
2.
Release the connector block from the coolant level sensor.
3.
Check that the switch is activated and that it sends a signal when the expansion tank is empty.
4.
Then fill the expansion tank with coolant and check that the resistance is infinite.