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Home >> GMC >> 2006 >> Envoy 4.2 S, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.2L - DTC P0135 To P0418 >> DTC P0412 >> Component Testing

Component Testing

Connect the relay coil connections to fused battery voltage and ground. Measure resistance through the relay contacts at 0 ohms.