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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 122 (Engine Controls And Fuel - 2.7L (L3B) - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> Relative Engine Compression Test >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

The Relative Engine Compression test monitors battery voltage drop during engine cranking to determine the relative compression of all cylinders. Each compression stroke causes mechanical resistance, increasing the current draw on the battery. Starter current and battery voltage are inversely proportionate.

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