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Home >> Chevrolet >> 2008 >> Optra LS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.0L (Diesel) >> Diagnostic Information and Procedures >> DTC P1691 >> Circuit/System Verification
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Circuit/System Verification

  1. Engine idling, observe the scan tool DTC information parameter. DTC P1691 should not set.
  2. Engine idling at the normal operating temperature. Compare the scan tool ECT sensor parameter with the engine coolant temperature gage on the instrument panel cluster (IPC). The temperatures should match.
  3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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