Cummins ISM CM870 (2003-06) Fault Code: 338 PID: S087 SPN: 1267 FMI: 3/3 Idle Shutdown Vehicle Accessories Relay Driver Circuit – Voltage Above Normal, or Shorted to High Source. Open circuit or short to voltage source detected at the idle shutdown vehicle accessory/ignition bus relay circuit.

The ECM monitors the voltage level on this circuit. If it detects a voltage when the signal is commanded OFF, it records this fault code.

Possible causes:

1)ECM Idle Shutdown feature set up incorrectly.
2)Open circuit in the idle shutdown relay, OEM harness, or connectors.
3)Short circuit to a voltage source in the OEM harness or relay.

Possible repair:

1)Replace the idle shutdown relay.
2)Repair or replace the OEM harness.

Categories Cumminz, DTC TRUCKS, ISM CM870 (2003-06) Tags -, 1267, 2003-06, 3/3, 338, Above, Accessories, accessory/ignition, at, bus, Circuit, Circuit., CM870, Code, Cummins, Detected, Driver, Fault, FMI, High, Idle, ISM, Normal, Open, or, PID, Relay, S087, short, Shorted, Shutdown, Source, Source., SPN, the, to, Vehicle, Voltage

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