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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 145 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L And 6.2L - DTC P0335 To DTC P3449) >> DTC P0685, P0689, or P0690 >> DTC Descriptors >> Notes

DTC Descriptors: Notes

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DTC P0685

Engine Controls Ignition Relay Control Circuit

DTC P0689

Engine Controls Relay Feedback Circuit Low Voltage

DTC P0690

Engine Controls Relay Feedback Circuit High Voltage

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Diagnostic Fault Table

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Relay Coil B+ P0685 P0685 - -
Relay Switch B+ P0689 P0689 - -
Relay Coil Control P0685 P0685 P0685 -
Relay Ignition Output Ignition 1 Voltage P0689 P0689 P0690 -
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