Group 23 EMS 2 Electrical fault tracing
49
Check of sensor, coolant
temperature
1. Turn off engine
2. Remove the contact and remove the sensor from
the engine.
3. Measure using multimeter 9510060-8 between the
sensor’s two contact pins. The multimeter should
display a value as shown in the adjacent diagram
and graphic.
NOTE: The sensor is very sensitive to temperature
changes. When measuring in the lower temperature
ranges 0-40°C (32-104°F), it is sufficient to hold the
sensor in your hand for the resistance value to drop
rapidly.
Check of combination sensor,
charge air pressure/charge air
temperature
Check, charge air pressure
1. Turn off engine
2. Disconnect connector A on the control unit and
connect the 62-pin adapter 9998699 between the
control unit and cable harness. Then connect mul-
timeter 9510060 between measurement points
7–11.
3. Turn on the control voltage.
4. Measure with the multimeter set to voltage mea-
surement. Check that the multimeter shows 5.0
volt.
5. Now connect the multimeter between measure-
ment points 11–22. The voltage should be approx
1.2 V at normal atmospheric pressure.
Check, charge air temperature
1. Detach the connector to the charge pressure sen-
sor.
2. Disconnect connector A on the control unit and
connect the 62-pin adapter 9998699 to the cable
harness with the control unit disconnected .
3. Measure with multimeter 9510060 set to resis-
tance measurement between the adapter’s mea-
surement points 11 –47.
The multimeter should show the following values:
~15800 Ω -20 °C (-4 °F)
~2500 Ω 20 °C (68 °F)
~850 Ω 50 °C (122 °F)
NOTE: Even if the resistance values in the table abo-
ve are met, this is no guarantee that the sensor is not
faulty.

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