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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 35 (Engine Controls - Tests W/Codes - 3.9L) >> Self-Diagnostic System >> Entering On-Board Diagnostics >> Malfunction Indicator Light (MIL) Mode

Malfunction Indicator Light (MIL) Mode

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, 1995 Dodge Dakota, and 1995 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start engine (if possible). Move transmission shift lever through all positions, ending in Park. Turn A/C switch on and then off (if equipped).
  2. Turn engine off. Without starting engine again, turn ignition on, off, on, off and on within 5 seconds. Record 2-digit trouble codes as displayed by flashing MIL.
  3. For example, Trouble Code 23 is displayed as flash, flash, 4-second pause, flash, flash, flash. After a slightly longer pause, other codes stored are displayed in numerical order.
  4. When MIL begins to flash trouble codes, it cannot be stopped. Start over if count is lost. Code 55 indicates end of trouble code display.
  5. Refer to TROUBLE CODES/MESSAGES  to translate trouble code number to a scan tool trouble code message. Once trouble area is identified, proceed to TEST TC-1A. Use scan tool trouble codes to find appropriate test.
  6. As an example, a 3.0L engine starts and runs but has a driveability problem. MIL indicates a Code 14. Refer to TROUBLE CODES/MESSAGES  to translate trouble code number to a scan tool trouble code message.
  7. When scan tool trouble code message is obtained, refer to appropriate test number. To clear trouble codes, see CLEARING TROUBLE CODES .
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