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HOMESERVICE MANUALSGMC1992MAGNAVAN 5.7 KREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - V6TROUBLE CODE CHARTSCODE 32, EGR SYSTEM ERRORALL ENGINES WITH 4L80-E TRANS. EXCEPT 4.3L
1992 GMC Magnavan 5.7 K

All Engines With 4L80-E Trans. Except 4.3L

1992 GMC Magnavan 5.7 KSECTION All Engines With 4L80-E Trans. Except 4.3L

PCM controls a solenoid that regulates vacuum to the EGR valve. The normally closed solenoid prevents vacuum from passing until it is energized by PCM. A properly operating EGR will directly affect fuel integrator counts. With EGR valve open, integrator counts will be less than without EGR operation. If monitored integrator counts do not change with EGR commanded, Code 32 will set.

ECM checks EGR operation when engine speed is greater than 1600 RPM, MAP sensor signal indicate cruise condition and throttle position is constant.

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. With ignition on and engine off, solenoid should not be energized or allow vacuum to pass to EGR valve. When test terminal "B" of the ALDL connector is grounded, EGR solenoid should be energized, allowing vacuum to the EGR valve. Vacuum should hold.
  2. Checks for plugged EGR passages. If passages are plugged, engine may have severe detonation on acceleration.
  3. Vehicle must be driven during this test to produce sufficient load to operate EGR. Lightly accelerating (approximately 1/4 throttle) will produce a large and stable enough reading to determine if ECM is commanding system on.
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