Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit Description
PCM directly controls the ground for the linear EGR valve when certain conditions have been met. PCM contains a diode feedback circuit which dissipates energy when valve is cycled off. When PCM grounds the valve, a diagnostic feedback signal can determine is valve had actually moved. This DTC has been defined to monitor feedback signal. This diagnostic will determine if the position feedback signal properly falls within the correct range under different valve operating conditions.
If commanded EGR position is greater than 80 percent, actual position must be within 26 counts (10 percent or 0.5 volt) of commanded position. If commanded position is less than 80 percent, actual position must be within 60 counts (24 percent or 1.1 volts) of commanded position. DTC will set if either condition exists for greater than 10 seconds. When either one of these tests have failed, a DTC will set and EGR will be disabled for this ignition cycle. The malfunction history record will indicate which one of these tests has failed to aid in diagnosis. EGR position error is continuously checked when the EGR is commanded on. The EGR valve may operate at any engine coolant temperature regardless of loop mode.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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