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.
With the DRBIIIt, read DTC’s.
With the DRBIIIt, erase DTC’s.
Turn the ignition off.
Turn the ignition on.
Start the engine.
With the DRBIIIt, read DTC’s.
Does the DRBIIIt 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)
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