Firebird V6-173 2.8L (1986)
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EGR Control
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Engine at normal operating temperature.
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Accelerate to 1500 rpm and note light.
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Light should stay out.
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Repeat test in drive.
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Light should get brighter as engine rpm goes up.
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If both tests pass then the P/N switch is OK.
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If either test fails, proceed with CHART C-1A.
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If C-1A does not find a problem see EGR check CHART C-7.
2.
Checks for an open switch in drive range. If using an ohmmeter instead of a test light to 12 volts, the resistance will be high or infinity, indicating an
open switch.
3.
Checks to this point indicate the P/N switch and wiring are OK, however, the ECM signal voltage on CKT 434 may be missing. To check,
reconnect ECM. Either back probe ECM connector CKT 434 with selector in drive or disconnect P/N switch and probe harness connector CKT 434
with a voltmeter to ground.
