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Symptom: SYSTEM OVER VOLTAGE When Monitored and Set Condition: SYSTEM OVER VOLTAGE When Monitored: Ignition on. The CAB monitors the Fused B(+) circuit at all times for proper system voltage. Set Condition: If the voltage is above 16.5 volts, the Diagnostic Trouble Code (DTC) is set. POSSIBLE CAUSES INTERMITTENT DTC BATTERY CHARGER CONNECTED FUSED IGNITION SWITCH OUTPUT (RUN) CIRCUIT HIGH DAMAGED CAB/CAB HARNESS CONNECTOR CAB - GROUND CIRCUIT OPEN CAB - INTERNAL FAULT TEST ACTION APPLICABILITY 1 Turn the ignition on. t, read DTC’s. With the DRBIII t, erase DTC’s. Turn the ignition off. t, read DTC’s. Does the DRBIII t display SYSTEM OVER VOLTAGE? All Yes → Go To 2 No → Go To 7 2 Is a battery charger connected to the vehicle? All Yes → Ensure the battery is fully charged. Perform ABS VERIFICATION TEST - VER 1. No → Go To 3 28 BRAKES (CAB) |