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.
Cummins ISB CM550 (1990-94) Fault Code: 151 PID: SPN: FMI: Coolant Temperature – Engine Protection
Cummins ISB CM550 (1990-94) Fault Code: 146 PID: 110 SPN: 110 FMI: 0 Coolant Temperature – Engine Protection
Cummins ISB CM550 (1990-94) Fault Code: 145 PID: 110 SPN: 110 FMI: 4 Engine Coolant Temperature 1 Sensor Circuit – Voltage Below Normal or Shorted to Low Source
Cummins ISB CM550 (1990-94) Fault Code: 145 PID: 110 SPN: 110 FMI: 3 Engine Coolant Temperature 1 Sensor Circuit – Voltage Below Normal or Shorted to Low Source
Cummins ISB CM550 (1990-94) Fault Code: 144 PID: 110 SPN: 110 FMI: 4 Coolant Temperature Sensor Circuit
Cummins ISB CM550 (1990-94) Fault Code: 144 PID: 110 SPN: 110 FMI: 3 Coolant Temperature Sensor Circuit
