Chart C7 - EGR Check
The EGR valve is controlled by a normally closed solenoid (allows vacuum to pass when energized). The ECM energized solenoid to turn EGR on, and monitors EGR flow with EGR temperature switch. Code 32 will detect a faulty solenoid, temperature switch, or vacuum supply. CHART C7 checks for plugged EGR passages, a sticky EGR valve, or a stuck open solenoid. The ECM controls EGR based on engine coolant (about 77°F/25°C), throttle position sensor (off idle and steady), and MAP (steady throttle) inputs.
NOTE:
The following step numbers refer to the numbers in the accompanying flow chart(s).
- With ignition on and engine stopped, solenoid should not be energized and vacuum should not pass to EGR valve.
- Grounding diagnostic terminal will energize solenoid and allow vacuum to pass to valve.
- Checks for plugged EGR passages. If passages are plugged, the engine may have severe detonation on acceleration.