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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 70, A/C Compressor Relay Driver >> Circuit Description
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Circuit Description

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Relay is supplied voltage when ignition is on. PCM controls solenoid valve by providing a ground through one of its Quad-Driver Modules (QDM). When relay is actuated, terminal is grounded and its monitored voltage will be low. When an output is off, its terminal voltage will be high. Each QDM has a separate fault line to indicate presence of a current fault to control module central processor.