Circuit DescriptionThe Orginal Equipment Manufacturer (OEM) wiring harness connects multiple outputs or switched inputs to the ECM which can be enabled or disabled using INSITE™ electronic service tool, such as such as the accelerator interlock/engine torque limit switch or the clutch/engine protection override switch. Many of the outputs and switched inputs share a common wire on the OEM wiring harness. Refer to the engine wiring diagram to determine which features share common wires in the OEM harness.

Component LocationNot Applicable

Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault CodesThe Engine Control Module (ECM) detected that features which share a common input or output to the ECM were simultaneously enabled..

Action Taken When the Fault Code is ActiveThe ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.Conditions for Clearing the Fault CodeTo validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop TalkMany of the outputs and switched inputs share a common wire on the OEM wiring harness. If two features that share a common OEM wire are enabled simultaneously in the ECM, this fault code will be logged. To disable the fault code, disable one of the features on the shared OEM wire. For example, if the accelerator interlock switch and powertrain protection torque limit switch are both enabled in the ECM, either disable one of the features with INSITE™ electronic service tool or configure one of the features to be multiplexed using the SAE J1939 multiplexing feature.

Possible Cause:1) ECM calibration