QuestionQUESTION: pickup has single fuse located near air cleaner,for possibly obd,has direct short,will not run,no fuel thru injectors,scan toolvwill not link up to check codes,only info i could find related to fuse is it's also removed to clear stored codes.It has underhood diagonstics plug(obd-1)also incab above r.leg connector for (obd2)neither will work.can you please tell me which way to proceed. thank you troycox
ANSWER: I may be able to help with this, electrical problems are difficult to diagnose without being able to access the vehicle, can you identify the fuse for me by looking at the inside of the fuse cover, is it the EFI fuse? Has anything been done to the engine recently, any repairs or maintenance, battery replaced? Jump started?
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QUESTION: yes it is the efi fuse.problems all started when it run out of fuel,ownerswere never able to make run again without dumping gas in air cleaner intake,which they inturn caught on fire damaging it.now new fuel filter,pump,have been replaced,still no run.wires going to this fuse are,(blk.-red)and(brown).thank you TroyCOX
ps-batt.,jump start very poss.
AnswerHave you checked the wiring to see if any were burned? There is a white/red wire that comes from the EFI relay, this is where the short may be, this wire supplies a lot of the electrical compnents on the engine with voltage including the oxygen sensors in the exhaust, check undeneath to make sure none of the wires are shorted out to one another or ground. Located the diagnostic check connector under the hood and with the key off check the B+ terminal with an ohm meter to ground, if there is a direct short the resistance will be near zero ohms.
