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Cummins ISB CM550 (1990-94) Fault Code: 153 PID: 105 SPN: 105 FMI: 4 Intake Manifold Air Temperature Sensor Circuit

Circuit Description
The intake manifold air temperature sensor is used by the ECM to monitor the engine intake
air temperature. The intake manifold air temperature signal is used by the ECM for engine
protection system, cold start aid, timing, and fueling control.

Component Location
The intake manifold air temperature sensor is located on the side of the intake manifold at the rear of the head.

Shop Talk
If the sensor is functioning properly, compare the reading to the following table.

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