Firebird V8-305 5.0L (1982)
Malfunction Indicator Lamp: Symptom Related Diagnostic Procedures
Fig. 61 - Chart #5 Diagnosis
1. This checks for blown gauge fuse or open in "CHECK ENGINE" light circuit, including IP connector, printed circuit and "CHECK ENGINE"
lamp.
-
Normal response is lamp "ON".
2. This checks for a shorted ECM.
Grounded ECM terminal "G" will turn the "CHECK ENGINE" light "OFF". If disconnecting ECM turns light "ON", ECM is shorted. Normal
response is lamp "ON".
3. This checks for grounded wire from terminal "C"of lamp driver to terminal "G" of ECM, an open circuit to terminal "B" of lamp driver, a bad
