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Home >> Isuzu >> 1990 >> Trooper S, 2.6 E, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.8L >> Diagnostic Circuit Check >> Code 32: EGR System Malfunction >> Notes
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Code 32: EGR System Malfunction: Notes

The ECM operates a solenoid to control the EGR valve. This solenoid is normally closed. By providing a ground path, ECM energizes solenoid, allowing vacuum to pass to the EGR valve. The ECM monitors EGR effectiveness by occasionally de-energizing the EGR control solenoid, shutting off vacuum to the EGR valve diaphragm. With EGR valve closed, manifold vacuum will be greater than it was during normal EGR operation. This change will be relayed to ECM by the MAP sensor. Code 32 will be set if the change is not within the calibrated window and vehicle speed is greater than 50 MPH, engine vacuum is between 8-13 in. Hg and no change in throttle position occurs while test is being run.

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. With ignition "ON", engine stopped, solenoid should not be energized and vacuum should not pas to EGR valve. Grounding diagnostic terminal will energize solenid and allow vacuum to pass to valve.
  2. Checks for plugged EGR passages.
  3. Drive vehicle during this test to provide sufficient engine load to operate EGR. Lightly accelerating (approximately 1/4 throttle) will produce a large and stable enough reading to determine if ECM is turning system on.
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