Possible Cause

NOTE:  The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

• PGM-FI main relay 1 failure
• Poor connections or loose terminals between PCM and the under-hood fuse/relay box
• Poor or loose PCM ground terminals and connections
• Poor or loose 12 volt battery cables and connections
• Fuse blown
• 12 volt battery failure
• PCM internal circuit failure