C15 – 0105-03 Intake Manifold Air Temperature voltage high (38)

Conditions Which Generate This Code:

The Engine Control Module (ECM) detects the following conditions:
• The signal voltage from the intake manifold air temperature sensor is greater than 4.95 VDC for more than eight seconds.
• Engine coolant temperature is above ?10 C(15.0 F).
• The ECM has been powered for at least two seconds.

System Response:
The ECM will log the diagnostic code and the ECM will trigger a snapshot. The check engine
lamp will illuminate once this diagnostic code has been active for more than ten hours. The ECM will
default to 40 C (104.0 F) for the intake manifold air temperature. The ECM will turn on the cooling fan if the boost pressure is above 69 kPa (10.0 psi).

Possible Performance Effect:
None

Troubleshooting:
Perform the following diagnostic procedure: “Engine Temperature Sensor Open or Short Circuit – Test”

Results:
• OK – STOP.

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