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Home >> Saturn >> 2007 >> Sky Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls & Fuel - 2.4L - DTC P0420 To P2544 >> DTC P0641 or P0651 >> Circuit/System Verification

Circuit/System Verification

With the ignition ON and the engine OFF, observe the 5-volt Reference 1 and 2 parameters. The scan tool should display 4.3-4.7 volts for a normally operating system.

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