Group 23 EMS 2 Electrical fault tracing
54
Checking combined sensor,
air filter pressure/air
temperature
Checking air filter pressure function
1. Remove the connector from the sensor.
2. Connect the 4-pin adapter 9998534 between
the oil pressure sensor connector and engine har-
ness.
2. Measure with multimeter 9510060 adjusted to
measure resistance between the adapter mea-
surement points 1–2. The multimeter should show
330 Ω. If the measured the value is 2.2 kΩ when
the engine is shut-down, this means that the con-
tact is stuck in active position.
Checking air temperature function
1. Detach the connector to the oil pressure sensor.
2. Connect the 4-pin adapter 9998534 between
the oil pressure sensor connector and engine har-
ness.
3. Measure with multimeter 9510060 adjusted to
measure resistance between the adapter mea-
surement points 3–4. The multimeter should show
the following values:
16445 Ω ±822 Ω 0 °C (32 °F)
5000 Ω ±220 Ω 25° C (77° F)
4026 Ω ± 160 Ω 30° C (86° F)
1246 Ω ±40 Ω 60 °C (140 °F)
463 Ω ±10 Ω 90 °C (194 °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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