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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 935 (Engine Controls And Fuel - 4.8L, 5.3L, 6.0L And 6.2L - DTC P0231 To DTC P1255) >> DTC P0685, P0689, or P0690 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the powertrain relay.
  2. Test for 65-110 ohms of resistance between terminals 85 and 86 of the relay.
    • If the resistance is not within the specified range, replace the relay.
  3. Test for infinite resistance between the following terminals:
    • Terminal 30 and 86
    • Terminal 30 and 87
    • Terminal 30 and 85
    • Terminal 85 and 87
    • If not the specified value, replace the relay.
  4. Install a 20A fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 1 ohm of resistance between terminals 30 and 87.
    • If greater than the specified range, replace the relay.
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