Cummins ISB CM850 (2003-06) Fault Code: 153 PID: 105 SPN: 105 FMI: 3 Intake Manifold Air Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at intake manifold air temperature circuit.
Cummins ISB CM850 (2003-06) Fault Code: 153 PID: 105 SPN: 105 FMI: 3 Intake Manifold Air Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at intake manifold air temperature circuit.
The intake manifold air temperature sensor shares RETURN wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active. Check active fault codes with multiple counts first.
Possible causes:
1)Open return circuit in the harness, connectors, or sensor
2)Open signal circuit or shorted to voltage source.
The sensor return configuration for Euro 4 ISB engines has been changed for automotive wiring harnesses manufactured from February 2012 onward. The new style wiring harnesses can be be identified using the method below:
1)Disconnect the ECM connector
2)Disconnect the camshaft position sensor
3)Disconnect the intake manifold pressure/temperature sensor
4)Check for continuity between the intake manifold pressure/temperature sensor RETURN pin, and the camshaft position sensor RETURN pin
5)Check for continuity between ECM pin 47 and the camshaft position sensor RETURN pin
6)Use the table below to determine which harness is fitted to the engine.
NOTE: QSB engines, all C series engines, and all L series engines are not affected by this change.
Possible repairs:
1)Replace the intake manifold air temperature sensor.
2)Replace the ECM.
3)Replace the engine harness.
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