Mechanics

WON'T START

2000 Ford Taurus • 6 cylinder FWD Automatic • 135,000 miles

2000 FORD TAURUS WON'T START-NO CRANK. DEAD. RADIO, LIGHTS, HEATER, ETC. ALL WORK FINE. JUMPERED SOCKET 30 OF STARTER RELAY TO BATTERY AND STARTER ROLLS MOTOR. METERED FROM GROUND TO STARTER RELAY SOCKET 85 WITH KEY TO START AND GET +12 VOLTS. ALL RELAYS AND FUSES ARE GOOD. THE LAST PART OF THE STARTER CIRCUIT IS A WIRE FROM STARTER RELAY SOCKET 86 TO THE PCM. WHAT IS THIS? CAN IT BE MY PCM THAT IS PREVENTING A START? ANY WAY TO BYPASS? PROBLEM WAS INTERMITTENT FOR A DAY- NOW DEAD
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DEEJASJR
January 25, 2011.




PCM grounds relays to fuel and start. If no ground the PCM is not doing it's job. Possible reasons are short in wiring somewhere or security problem.


Tiny
Fixitmr
Jan 25, 2011.
Are the injectors showing 12v with key on? You could have a bad PCM?


Tiny
Fixitmr
Jan 25, 2011.
Attached is the starting circuit schematic.

The relay receives its ground from the PCM and it could be a faulty PCM or the security system is armed.


KHLow2008
Jan 28, 2011.
HAVEN'T CHECKED FOR VOLTS AT INJECTORS YET. DON'T APPEAR TO BE GETTING A GROUND SIGNAL FROM THE PCM AT PIN 44 TO THE STARTER RELAY. I ALSO DON'T EVER HEAR THE FUEL PUMP TRY. PRETTY SURE THE PCM IS TELLING THE CAR NOT TO START. GOT A CODE READER TO SEE IF THAT MAY TELL ME ANYTHING, IT DID- LINK ERROR ! TRYING TO FIGURE OUT IF IT'S THE PCM, PATS, OR IF THE TRANSPONDER ON THE KEY HAS GONE BAD. ANY IDEAS ON NARROWING? SHOULD I FIRST DISCONNECT THE BATTERY AND CHECK OUT THE PCM CONNECTOR FOR CONTINUITY ON PIN 44 TO THE STARTER RELAY, CORROSION, ETC.?


Tiny
DEEJASJR
Jan 29, 2011.
Link error can result from a no voltage erase and wont work until car starts again.


Tiny
Fixitmr
Jan 29, 2011.
HOPEFULLY I'LL GET SOME TIME TODAY TO DO SOME MORE TROUBLESHOOTING. THE BATTERY WAS DEFINITELY DISCONNECTED AFTER THIS HAPPENED-FOR ABOUT A WEEK, (THIS IS MY DAUGHTERS CAR-HER "MECHANIC" FRIEND PULLED THE STARTER WITHOUT CHECKING ANYTHING FIRST AND IT'S BEEN DUMPED IN MY LAP SINCE THAT MOMENT). ANYWAY, THE PATS SEEMS TO BE WORKING AS IT SHOULD- 2 SEC FLASH IN OFF AND OFF IN RUN OR START, NO RAPID FLASH OR STEADY ON. DOES ANYONE KNOW OF ANY OTHER SENSOR OR DEVICE THAT WOULD TELL THE PCM THAT IT IS NOT O.K. TO EVEN TRY TO CRANK THE MOTOR? IF NOT I'LL CONTINUE CHECKING ALL THE GROUND REFERENCE POINTS ON THE PCM HARNESS AND THEN MOVE TO A CLOSER LOOK AT THE PCM ITSELF. WOULD IT MAKE SENSE TO BE THE PCM IF THIS WAS AN INTERMITTENT PROBLEM FOR A DAY OR TWO?


Tiny
DEEJASJR
Jan 29, 2011.
GOT OUT TODAY AND METERED ABOUT 60% OF THE WIRING OFF OF THE PCM. NOTHING APPEARED TO BE OUT OF WHACK. I DID NOTICE A FAIR AMOUNT OF CONDENSATION WHERE THE HARNESS MATES TO THE PCM, THE PIS AND SOCKETS. I'VE REMOVED THE PCM AND BROUGHT IT IN TO CLEAN AND DRY. HOPEFULLY THIS COULD BE THE ROOT CAUSE OF MY PROBLEMS?


Tiny
DEEJASJR
Jan 29, 2011.
PINS, NOT PIS


Tiny
DEEJASJR
Jan 29, 2011.
Keep pluggin away.
AD


Tiny
Fixitmr
Jan 30, 2011.
Two things to look at, one pull the connector off the crank sensor and plug its back in. If no start the pigtail at the starter may be one that ford put a technical service bulletin out on, they have a wire kit to fix it. Look for any corrosion at starter


Merlin2021
Mar 24, 2011.

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