How do I diagnose Electrical problems? Check EngineSoon Light came on.Truck is running rough.

Asked by Feb 13, 2013 at 05:00 AM about the 2001 Ford F-150 XL LB

Question type: Maintenance & Repair

How can I use a wire to jump diagnostic plug leads into diagnostic mode to read diagnostic codes.My check engine soon light has come on.Enginge is runnunig rough.Lights dim when I rev engine.

2 Answers

You don't. You start jumping pins and will cause more problems than you already have. Any big chain type AutoParts store will read them for you. FREE Be it OBD or OBDII take it to the AutoZone PepBoys anything like that

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David is right, your truck has the OBDii system and you can only use a code scanner. You can purchase a basic one these days for $20. Only the OBD system 1996 and older vehicles in the US can you use a voltmeter and jumper pins.

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