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Reason:Injector Solenoid Driver Cylinder 4 – 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 5 – 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 6 – 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:Engine Magnetic Speed/Position Lost Both of Two Signals – Data Erratic, Intermittent, or Incorrect. The ECM has detected the primary and backup speed sensor signals are connected backwards. Effect:The engine will shut down or will not start. Circuit Description:The crankshaft position and camshaft position sensors are Hall effect type sensors. The engine control module (ECM) provides a 5 volt supply to the position sensor and a return circuit. As the teeth on the crankshaft speed ring or the dimples in the back of the camshaft gear move past the position sensor, a signal is generated on the position sensor signal...

Reason:Intake Manifold 1 Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the intake manifold pressure circuit. Effect:Possible reduced engine performance. Circuit Description:The engine control module (ECM) provides a 5 volt supply to the intake manifold pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The intake manifold pressure sensor provides a signal to the ECM on the intake manifold pressure sensor signal circuit. This sensor signal voltage changes based on the pressure in the intake manifold. Component Location:The intake manifold 1 pressure/temperature...