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Symptom: SYSTEM UNDERVOLTAGE When Monitored and Set Condition: SYSTEM UNDERVOLTAGE When Monitored: Ignition on. The CAB monitors the Fused Ignition Switch Output circuit voltage above 10 km/h (6 mph) every 7 milliseconds for proper system voltage. Set Condition: If the voltage is below 9.5 volts, the Diagnostic Trouble Code (DTC) is set. POSSIBLE CAUSES BATTERY VOLTAGE LOW INTERMITTENT DTC FUSED IGNITION SWITCH OUTPUT CIRCUIT HIGH RESISTANCE GROUND CIRCUIT OPEN CAB - INTERNAL FAULT 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 Undervoltage DTC present right now? All Yes → No → 2 Engine Running. All Yes → Refer to appropriate service information for charging system No → 3 Turn the ignition off. All Yes → No → Repair the Ground circuit for an open. 48 BRAKES (CAB) |