Exhaust Gas Recirculation (Port Fuel Injection)

Chart C-7 - Exhaust Gas Recirculation (EGR) Check:

Wiring Diagram for Chart C-7 - Exhaust Gas Recirculation (EGR) Check:

CHART C-7 - EXHAUST GAS RECIRCULATION (EGR) CHECK

Circuit Description:


The EGR valve is controlled by a normally closed solenoid (allows a vacuum to pass when energized). The ECM energizes the solenoid to turn the EGR "ON," and monitors vacuum to the EGR with the EGR diagnostic switch. Code 32 will detect a faulty solenoid, vacuum switch or vacuum supply. CHART C-7 checks for plugged EGR passages, a sticking EGR valve, or a stuck open solenoid.


Test Description: Numbers below refer to circled numbers on the diagnostic chart.

1. With the ignition "ON," engine stopped, the solenoid should not be energized and vacuum should not pass to the EGR valve.

2. Grounding the diagnostic terminal will energize the solenoid and allow vacuum to pass to valve.


3. Checks for plugged EGR passages. If passages are plugged, the engine may have severe detonation on acceleration.

4. The EGR solenoid will not be energized in Park or Neutral. This test will determine if the Park/Neutral switch input is being received by the ECM.