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Home >> Cadillac >> 2008 >> DTS 4.6 9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 4.6L - DTC P0340 To DTC P2138 >> DTC P0641 or P0651 >> Circuit/System Verification

Circuit/System Verification

P0641

  1. Observe the 5-volt reference 1 circuit status parameter with a scan tool. The scan tool should display OK.
  2. Engine running, observe the DTC information with a scan tool. DTC P0641 should not set.
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame Records data.

P0651

  1. Observe the 5-volt reference 2 circuit status parameter with a scan tool. The scan tool should display OK.
  2. Engine running, observe the DTC information with a scan tool. DTC P0651 should not set.
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame Records data.
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