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A-2, Mil On Steady Or Won't Flash Code 12

WARNING: This page is about a different car, the 1994 Pontiac Bonneville, 1994 Oldsmobile Eighty-Eight, and 1994 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform self-diagnostic procedures first. See appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section. Turn ignition off. Disconnect PCM connectors. Turn ignition on. If MIL did not come on, go to next step. If MIL came on, repair short to ground in circuit No. 419 (Brown/White wire). If circuit is okay, check for faulty instrument panel.
  2. Check PROM for proper installation. If PROM is okay, replace PCM using original PROM. Reconnect PCM connectors. Install Tech 1 scan tester. Turn ignition on. Using scan tester, turn MIL off. If MIL turns off, system is okay. If MIL does not turn on, replace faulty PROM.
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