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Reason:Engine Control Module Critical Internal Failure -Bad Intelligent Device or Component. Error internal to the engine control module (ECM) related to memory hardware malfunctions or internal ECM voltage supply circuits. Effect:Engine may not start or may be difficult to start. Circuit Description:The ECM has internal diagnostics that continuously run and check the internal memory. Component Location:The Engine Control Module (ECM) is mounted on the intake manifold side of the engine. Conditions for Running the Diagnostics:This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running. Conditions for Setting the Fault Codes:The Engine Control...

Reason:Power Supply Lost With Ignition On – Data Erratic, Intermittent, or Incorrect. Supply voltage to the ECM fell below a calibrated limit momentarily, or the ECM was not allowed to power down correctly (retain battery voltage for 30 seconds after key OFF). Effect:Possible reduced engine performance Circuit Description:The engine control module (ECM) receives constant voltage from the batteries through the unswitched battery wires that are connected directly to the positive (+) battery post. The ECM receives switched battery input through the vehicle keyswitch wire when the vehicle keyswitch is turned ON. Component Location:The ECM is connected to the battery by...

Reason:Injector Solenoid Driver Cylinder 1 – Mechanical System Not Responding or Out of Adjustment. The ECM has detected an error with the injection timing or quantity. Effect:Possible reduced engine performance Circuit Description:The ECM uses diagnostic software to verify injector operation. During selected conditions, each injector is fired. The fueling quantity and timing are then compared to a specified threshold. Component Location:The engine harness connects the ECM to the pass-through connector(s) that are located in the rocker housing. Internal injector harnesses are located under the valve cover and connect the injectors to the engine harness at the pass-through connector(s). Conditions for...

Reason:Injector Solenoid Driver Cylinder 2 – Mechanical System Not Responding or Out of Adjustment. The ECM has detected an error with the injection timing or quantity. Effect:Possible reduced engine performance. Circuit Description:The ECM uses diagnostic software to verify injector operation. During selected conditions, each injector is fired. The fueling quantity and timing are then compared to a specified threshold. Component Location:The engine harness connects the ECM to the pass-through connector(s) that are located in the rocker housing. Internal injector harnesses are located under the valve cover and connect the injectors to the engine harness at the pass-through connector(s). Conditions for...

Reason:Injector Solenoid Driver Cylinder 3 – Mechanical System Not Responding or Out of Adjustment. The ECM has detected an error with the injection timing or quantity. Effect:Possible reduced engine performance Circuit Description:The ECM uses diagnostic software to verify injector operation. During selected conditions, each injector is fired. The fueling quantity and timing are then compared to a specified threshold. Component Location:The engine harness connects the ECM to the pass-through connector(s) that are located in the rocker housing. Internal injector harnesses are located under the valve cover and connect the injectors to the engine harness at the pass-through connector(s). Conditions for...