Cummins ISX12 CM2250 (2010-12) Fault Code: 346 (MD) PID: SID 253 SPN: 630 FMI: 12 Engine Control Module Calibration Memory Software- Bad Intelligent Device or Component
Circuit Description
The Original Equipment Manufacturer (OEM) wiring harness connects multiple outputs or switched inputs to the ECM. They 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 Location
The output or switched inputs to this diagnostic are found in the OEM harness.
Conditions for Running the Diagnostics
This diagnostic runs at initial key ON only.
Conditions for Setting the Fault Codes
The ECM detects that features that share a common OEM harness input or output to the ECM are simultaneously enabled at the same time.
Action Taken When the Fault Code is Active
The ECM will set the fault code active immediately after the diagnostic is set. The features that are in conflict may not operate correctly.
Conditions for Clearing the Fault Code
To validate the repair, 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 conflicting features have been adjusted correctly and the diagnostic runs and passes.
The ECM will turn off the amber CHECK ENGINE lamp 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.
Shop Talk
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
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