Cummins ISX CM870 (2003-06) Fault Code: 122 PID: P102 SPN: 102 FMI: 3/3 Intake Manifold Pressure Sensor Circuit – shorted high. High signal voltage detected at the intake manifold pressure circuit.
The intake manifold pressure sensor shares supply and return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active.
Possible causes:
1)Open return circuit in the engine harness, connectors, or sensor
2)Signal wire shorted to sensor supply or battery voltage.
Possible repairs:
1)Replace the intake manifold pressure sensor.
2)Replace the ECM
3)Repair or replace the engine harness.
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