Diagnostic Aids

When attempting to diagnose an intermittent problem, use scan tool to review malfunction history information. This data can be used to duplicate a problem.

Use scan tool to command EGR solenoid on while monitoring EGR SENSOR. Values for EGR SENSOR at a commanded state of zero percent and 70 percent should be:

• Zero percent commanded, 0.5-1.0 volt from EGR SENSOR.
• 70 percent commanded, 4.2-4.7 volts from EGR SENSOR.

An open in Black wire or short to voltage in Brown wire will cause DTC to set.

Debris or binding pintle shaft holding EGR valve open may also set DTC.

Check for backed-out or damaged terminals, or for proper terminal connection. Check for stuck open EGR pintle. Check for open in circuit between EGR harness connector terminal "B" and PCM. Check for short to ground in circuit between EGR harness connector terminal "A" and PCM, which will cause severe rough idle and driveability complaint.