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Symptom: SYSTEM OVERVOLTAGE When Monitored and Set Condition: SYSTEM OVERVOLTAGE 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 for greater than 420 milliseconds (ms), the Diagnostic Trouble Code (DTC) is set. POSSIBLE CAUSES BATTERY OVERCHARGED FUSED IGNITION SWITCH OUTPUT HIGH GROUND CIRCUIT OPEN CAB - INTERNAL FAULT INTERMITTENT DTC TEST ACTION APPLICABILITY 1 Turn the ignition on. t, erase DTC’s. Turn the ignition off. t, read DTC’s. Does the DRBIII t display System Overvoltage DTC present right now? All Yes → No → 2 Turn the ignition off. All Yes → Charge battery to proper level. Disconnect the battery charger. No → 51 BRAKES (CAB) |