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Home >> Chevrolet >> 1995 >> Corvette ZR-1 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Controls - Tests W/Codes) >> ECM/Pcm Code Charts >> Code 91, 1-4 Upshift Light >> Circuit Description

Circuit Description

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When 1-4 shift light is energized, PCM is energizing 2nd-3rd blockout relay and gearshift can only be moved from 1st to 4th gear. This will occur only once per upshift cycle. Upshift can not be repeated until vehicle speed drops to less than one MPH.

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