Why my 1991 caddilac, Brougham, 305 V8 will not start?

WILLIE BAILEY

MEMBER
1991 CADILLAC BROUGHAM
V8
2WD
AUTOMATIC
113,000 MILES

While troubleshooting my car, I found the wires to the speed sensor and TCC solenoid all five wires were bare were touching. Maybe that is why the speedometer only shows zero when the car is driven

I cut out the bare wires and spliced them. When I tried to start the car, it turns over but will not start. I got a check engine light. When I installed a jumper wire between terminals a and b on the diagnosticv terminal, I got code 54. This code on page 6-15 in my Haynes repair manual, reads, the mixture control solenoid voltage is high at the ECM because of a shorted M/C solenoid circuit/ or faulty ECM. My car is fuel injected and does not have a mixture control solenoid. That part is on a carburated engine.

I ordered a new ECM. Before I change it, I would appreciate input on my problem. I have checked all of the wiring to the ECM, battery, starter, TPITCC solenoid, speed sensor and speed sensor buffer. All of the fuses are good.

7 Replies

RASMATAZ

MECHANIC
75,992 POSTS

If its cranking over and will not start -Go to this link:https://www.2carpros.com/articles/car-cranks-but-wont-start

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Saturday, February 4th, 2012 AT 11:09 PM

CADIEMAN

MECHANIC
3,544 POSTS

Are you sure your reading this code right?You blew something do all the fuses under the hood and inside good?Youll need to check with a test light. Do you have the proper year manual. Check the fuses in the r/s under dash relay panel.

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Sunday, February 5th, 2012 AT 12:18 AM

CADIEMAN

MECHANIC
3,544 POSTS

Check the fuses under the hood, under the r/side of the dash in the relay panel and the interior fuse panel. Use a test light and make sure they all show voltage on both sides.

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Sunday, February 5th, 2012 AT 4:19 AM

WILLIE BAILEY

MEMBER
14 POSTS

My 1991 caddilac RWD brougham, 305 v8, does not have a relay/fuse panel under dash RH access panel. Nor does it have a fuse panel under the hood. There ar three fuses on the RH fender well in line in wires coming from the positive stud in a red plastic small box for positive wires and a cable coming from the positive battery cable.

There is a small fuse panel outbd of the main fuse panel, under dash LH side. It has five fuses in locations marked 1.4, 5.6 and 7. There are six grey 30/20 amp, 12v plastic square fuses and one black one. All of the blade fuses checked good. I have not checked the grey and black ones. I do not know how to check the pastic ones.

I am checking the check engine light with the car diagnostic terminal. After I get the 12 code, I get five blinks, pause and then four, I checked it several times. The reason I suspect the ECM, is because that code indicates it could be bad. My car also has speedometer indication problems. Everything works as advertised on the instrument cluster, except the MPH indication when driving the car.

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Sunday, February 5th, 2012 AT 9:11 PM

CADIEMAN

MECHANIC
3,544 POSTS

Been a long time since ive been at the dealer.I researched a correct answer.I know 12 is system clear. Now a code 54 is egr sys. Failure or fuel pump circut low voltage. Since it wont start we need to check the fuel pump circut.I remember all those broughams having fuse and relay panel mounted below the glove box right under the lower dash panel on the r/side of the dashs it maybe mounted to the firewall r/side to and this was where the 20 amp. Fuel pump fuse is. Please check again. We can start here and then we can fix the speed sensor problem next. Before you do anything go to red box that the possitive cable goes to open it you will see small fuse link wires going into the car. Pull on them 1 by 1 and make sure 1 isnt blown.