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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1149 (Engine Controls And Fuel - 3.6L - DTC P0496 To DTC P2235) >> DTC P0627, P0628, or P0629 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Measure for 70-110 ohms of resistance between terminals 85 and 86 of the fuel pump relay.
    • If not within the specified range, replace the fuel pump relay.
  2. Measure for infinite resistance between the following terminals of the fuel pump relay:
    • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    • If continuity is detected, replace the fuel pump relay.
  3. Connect a 20A fused jumper wire from the positive terminal of the battery to relay terminal 85. Connect a jumper wire from the negative terminal of the battery to relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the relay.
    • If the resistance measures greater than 2 ohms, replace the fuel pump relay.
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