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Chart A-2 (Brougham, Caprice, CAMARO, Corvette, Firebird & ROADMASTER W/5.7L)

  1. If MIL lamp does not flash with engine at idle, go to step 3). If MIL lamp flashes with engine at idle, turn ignition off. Disconnect PCM connector "D" ("C" on Corvette).
  2. Connect one end of test light to battery positive terminal. Touch other end to terminal "B" of the ALDL connector. If test light is on, repair circuit shorted to ground. If test light stays off, PCM is faulty.
  3. If MIL lamp did not flash in step 1), check for 5 volts at terminal "B" of the ALDL connector. If 5 volts are present, repair faulty connector at PCM or replace PCM. If 5 volts are not present, turn ignition off.
  4. Disconnect PCM connector "D" ("C" on Corvette). Using a jumper wire, connect terminal "B" of ALDL connector to ground. Connect one end of test light to battery positive terminal. Touch other end to appropriate PCM terminal of the "D" connector ("C" on Corvette). If test light stays off, repair open circuit. If test light is on, PCM connector is faulty or PCM is faulty.
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