How to Solve QSK60 CM2358 Engine Fault Code 1256 Error

This instruction show you guide on how to solve QSK60 CM2358 engine fault code 1256 error Control Module Identification Input State Error – Data Erratic, Intermittent, or Incorrect.

 

CODE

Fault Code: 1256

PID: P234

SPN: 1563

FMI: 2/2

LAMP: Amber

SRT:

REASON

The control module identification input state is incorrect.

 

EFFECT

Engine may run rough, may stop running, may not start, or may be difficult to start.

 

Related Contents:

INSITE 8.9.2 Engine Diagnostic Software

Cummings INLINE 6 Diagnostic Adapter

 

Circuit Description

The engine control module (ECM) uses the control module identification circuit to verify its location in the harness. The combination of control module identification signal pins that are connected to return allow the ECM to make this determination.

 

Component Location

The control module identification circuit is located in the harness.

 

Conditions for Running the Diagnostics

This diagnostic runs at initial key ON.

 

Conditions for Setting the Fault Codes

An invalid control module identification input has been detected.

 

Action Taken When the Fault Code is Active

The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.

 

Conditions for Clearing the Fault Code

To validate the repair, perform a key cycle, and leave the key in the ON position for 1 minute.

The fault code status displayed by the recommended Cummins® electronic service tool or equivalent 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 the recommended Cummins® electronic service tool or equivalent can be used to clear active and inactive faults.

 

Shop Talk

Possible causes of this fault code include:

Open or short circuit on one or more control module identification signal wire(s).

 

 

More repair case for QSK60 CM2358,please refer to QSK60 CM2358 Trouble Repair