CODE 998 NO VREF TO TPS MAP HEGO OR ECT. N

  • Tiny
  • Anonymous
  • 1992 FORD F-150
  • 120,000 MILES

Code 998, no vref to tps, map, hego, or ect. No vref coming from pin 26 on harness. ECM failure? Or possible ground problem? Truck runs, but, very rich, stalls, etc. Checked/ cleaned chassis grounds, as well as ohmed pin 46 (ecm ground).
have continuity to ground. Anything else before I buy a new ecm?

Tuesday, November 27th, 2012 AT 1:30 AM

1 Reply

  • Tiny
  • ASEMaster6371
  • EXPERT
  • 25,554 POSTS

Make sure the powers are there. If they are, yes you have a failed ecm

Roy

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Tuesday, November 27th, 2012 AT 1:38 AM

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