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Home >> Chevrolet >> 2008 >> Optra LS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.6L >> Diagnostic Information and Procedures >> DTC P0628 or P0629 >> Component Testing

Component Testing

  1. Ignition OFF, disconnect the harness connector at the fuel pump relay.
  2. Test for 70-110 ohms of resistance between terminals 85 and 86.
    • If not within the specified range, replace the fuel pump relay.
  3. Test for infinite resistance between the following terminals:
    • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    • If not the specified value, replace the fuel pump 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 2 ohms of resistance between terminals 30 and 87.
    • If greater than the specified range, replace the fuel pump relay.
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