Jeep XJ. Manual — part 580
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.
With the DRBIII
t, erase DTC’s.
Turn the ignition off.
Turn the ignition on.
Start the engine.
With the DRBIII
t, read DTC’s.
Does the DRBIII
t display System Overvoltage DTC present right now?
All
Yes
→
No
→
2
Turn the ignition off.
Inspect for battery charger connected to battery.
Is a battery charger connected to the battery?
All
Yes
→
Charge battery to proper level. Disconnect the battery charger.
Clear DTC’s.
Perform ABS VERIFICATION TEST - VER 1.
No
→
51
BRAKES (CAB)
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the CAB connector.
Note: Check connector - Clean/repair as necessary.
Start the engine.
Raise engine speed above 1,800 RPM.
Measure the battery voltage.
Is the voltage above 16.5 volts ?
All
Yes
→
Refer to appropriate service information for charging system
testing and repair.
Perform ABS VERIFICATION TEST - VER 1.
No
→
4
Turn the ignition off.
Disconnect the CAB connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance of the ground circuits.
Is the resistance below 1.0 ohm?
All
Yes
→
No
→
Repair the Ground circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
5
If there are no potential causes remaining, view repair.
All
Repair
Replace the Controller Antilock Brake.
Perform ABS VERIFICATION TEST - VER 1.
6
Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
All
Yes
→
Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
→
Test Complete.
52
BRAKES (CAB)
SYSTEM OVERVOLTAGE —
Continued
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.
With the DRBIII
t, erase DTC’s.
Turn the ignition off.
Turn the ignition on.
Start the engine.
Drive the vehicle above 16 Km/h (10 mph) for at least 20 seconds.
Stop the vehicle
With the DRBIII
t, read DTC’s.
Does the DRBIII
t display System Undervoltage DTC present right now?
All
Yes
→
No
→
2
Engine Running.
Measure the battery voltage.
Is the battery voltage below 10 volts?
All
Yes
→
Refer to appropriate service information for charging system
testing and repair.
Perform ABS VERIFICATION TEST - VER 1.
No
→
3
Turn the ignition off.
Disconnect the CAB connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance of the ground circuits.
Is the resistance below 1.0 ohm?
All
Yes
→
No
→
Repair the Ground circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
53
BRAKES (CAB)
TEST
ACTION
APPLICABILITY
4
Disconnect the CAB harness connector.
Turn the ignition on.
Measure the voltage of the Fused Ignition Switch circuit.
Is the voltage above 10 volts?
All
Yes
→
No
→
Repair the Fused Ignition Switch Output Circuit for high resis-
tance
Perform ABS VERIFICATION TEST - VER 1.
5
If there are no potential causes remaining, view repair.
All
Repair
Replace the Controller Antilock Brake.
Perform ABS VERIFICATION TEST - VER 1.
6
Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
All
Yes
→
Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
→
Test Complete.
54
BRAKES (CAB)
SYSTEM UNDERVOLTAGE —
Continued
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