Drove it yesterday, doesn't start today? 97 se sc
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Posts like a Northstar
Joined: Dec 2003
Posts: 589
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From: Rockwall County Texas

Put one in and blew it right on ignition. I think Im going to check back later. I want to spend some time with the wife and kids. Watch the game. Hey were on our way......
Glad you found that blown fuse, shows we're on the right track. I found a wiring diagram online for a 1997 Bonneville SE. Fuse #6 (20 amp) is for both the fuel pump and the ICM. Both are pink wires. Bad news is we don't know which is causing the fuse to blow. Good news is that it'll be easy to figure it out. You need to disconnect the wires going to the ICM then try another fuse. If it blows the problem is on the fuel side. If it doesn't blow its a problem with the ignition side.
Possible ignition problems will be the ICM & or the ignition coils. If the fuse doesn't blow with the ICM disconnected the next test to preform will be removing the coils, reconnecting the ICM, turn the key on and checking the fuse. If it blows without the coils I think it'll be time to look for a replacement ICM. If it doesn't blow then 1 or more coils are probably shorted out. Check the resistance of the primary side of each coil & post results.
Fuel pump problems would be the relay (try swapping the foglight relay)
Wiring diagram is also showing a 'fuel pump speed control module'. I don't recall ever seeing this mentioned on this forum. I don't know if it'* a separate module or part of the fuel pump.
You could also have a wire somewhere that wore through the insulation & is shorting out but let'* not worry about that yet.
Possible ignition problems will be the ICM & or the ignition coils. If the fuse doesn't blow with the ICM disconnected the next test to preform will be removing the coils, reconnecting the ICM, turn the key on and checking the fuse. If it blows without the coils I think it'll be time to look for a replacement ICM. If it doesn't blow then 1 or more coils are probably shorted out. Check the resistance of the primary side of each coil & post results.
Fuel pump problems would be the relay (try swapping the foglight relay)
Wiring diagram is also showing a 'fuel pump speed control module'. I don't recall ever seeing this mentioned on this forum. I don't know if it'* a separate module or part of the fuel pump.
You could also have a wire somewhere that wore through the insulation & is shorting out but let'* not worry about that yet.
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The series II SC 3800 uses a speed control module for the fuel pump...
You guys look like you are heading in the right direction... Good Work... Now it will be interesting to see what has failed causing the fuse to pop
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You guys look like you are heading in the right direction... Good Work... Now it will be interesting to see what has failed causing the fuse to pop
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Joined: Feb 2006
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From: Somewhere different on the globe every month....

Good job with the finding out wat that fuse does TecTed. The only description that I woud have is the label off the pannel. I am gald that we are starting to get it narrowed down!
You guys don't need me
Maybe a test of the green connector behind the battery (fp test lead) with continuity to ground. Then I'd also look over the ICM wire harness it goes from the connector on the front fuel rail (by ICM) to the ICM, cam and crank sensors. Just look for any problem areas.
Disconnect the ICM and see if that'* causing the fuse...If so..pull the coils with a 5.5mm socket and look everything over (coils and ICM). If you need either..I can get them to you in 2-3 or maybe a local yard etc.
Maybe a test of the green connector behind the battery (fp test lead) with continuity to ground. Then I'd also look over the ICM wire harness it goes from the connector on the front fuel rail (by ICM) to the ICM, cam and crank sensors. Just look for any problem areas.
Disconnect the ICM and see if that'* causing the fuse...If so..pull the coils with a 5.5mm socket and look everything over (coils and ICM). If you need either..I can get them to you in 2-3 or maybe a local yard etc.





