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Home >> Cadillac >> 2003 >> CTS Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0629: Fuel Pump Relay Control Circuit High >> Test Description
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Test Description

The numbers below refer to the step numbers in the diagnostic procedure.

  1. 4

    This step verifies that the control module is providing voltage to the fuel pump relay.
  2. 5

    This step tests for an open in the ground circuit to the fuel pump relay.
  3. 6

    This step tests if voltage is constantly being applied to the control circuit of the fuel pump relay.