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1990 Coupe Blows number 7 fuse when engine speed is increased


Guest Wellwoodntit

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Guest Wellwoodntit

Hi, My recently purchased Reatta Has a problem, the number 7 15 amp fuse blows as soon as the engine revs are increased to about 2000rpm.Then the engine service light comes on. Self diagnostic system tells me of a Code 26 error. I have disconnected the Aircon compressor [no different] & the EGR solenoids [ no effect & still the fuse blows]. Any help would be gratefully appreciated Cheers John ... PS. I am new to this computer stuff ,so forgive me if I am not "doing it correctly" John

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Welcome to the forum! As the RPM goes past 2000 have you watched the voltmeter to see how high it goes? I'm thinking you might have a bad voltage regulator in the alternator or a bad ground connection somewhere. Any more details you can provide?

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Guest Wellwoodntit
Welcome to the forum! As the RPM goes past 2000 have you watched the voltmeter to see how high it goes? I'm thinking you might have a bad voltage regulator in the alternator or a bad ground connection somewhere. Any more details you can provide?

Thanks for your suggestion. We have just put a Voltmeter [ Multi meter] on the alternator out & it registered a steady 15.2 volts at 2500 rpm. It seems that the canister purge valve is on the same circuit . Could this be the problem? if so any idea where it is located . thanks John

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Does the fuse only blow if your driving or will it blow sitting in the driveway when rpm goes past 2000? I don't understand how rpm comes into play. Just as a test unplug the electrical connector to the transmission and see if it still blows. If it does NOT blow the torque converter (TCC) solenoid might be shorted. A bad TCC will set a code 26.

Edited by Ronnie (see edit history)
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Guest Wellwoodntit
Does the fuse only blow if your driving or will it blow sitting in the driveway when rpm goes past 2000? I don't understand how rpm comes into play. Just as a test unplug the electrical connector to the transmission and see if it still blows. If it does NOT blow the torque converter (TCC) solenoid might be shorted. A bad TCC will set a code 26.

OK I THINK we have solved the problem, We disconnected the canister solenoid & thought we had it fixed ,but 2 miles down the road it blew again .[ Back to the drawing board ] On a hunch that we may have disturbed some wires whilst removing the air cleaner etc. we got underneath & the conduit was rotten & the pink/black lead was shorting on the subframe, a bit of tape and a new length of plastic conduit & bingo ,it seems OK . Anyway thanks for your help & we will keep our fingers [& toes ] crossed . Cheers for now John @ Las Vegas

:D:D

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