Code 32, EGR Circuit
The EGR vacuum control has an ECM controlled solenoid that pulses manifold vacuum to the EGR valve. The solenoid is always de-energized in Park, Neutral and at idle.
Code 32 will set if the EGR diagnostic vacuum switch does not sense vacuum with moderate to heavy engine load, but less than wide open throttle.
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- Be sure to check for presence of vacuum at throttle body side of EGR solenoid before continuing test.
- Grounding the test terminal of the ALDL causes the ECM to energize the solenoid by grounding circuit No. 471. Test light should be on.
- This step checks 12-volt source from ECM. A test light cannot be used.