Chrysler RG Voyager. Manual — part 365
Symptom:
PCI BUS LOOPBACK
When Monitored and Set Condition:
PCI BUS LOOPBACK
When Monitored:
Ignition On - Continuously
Set Condition:
When the ABM detects PCI Bus messages have been missing for 5 seconds
and has failed the self test.
POSSIBLE CAUSES
INTERMITTENT DTC
DAMAGED ABM/ABM HARNESS CONNECTOR
FUSED RUN RELAY OUTPUT CIRCUIT OPEN
ABS VALVE FUSED B(+) CIRCUIT OPEN
ABM - GROUND CIRCUIT OPEN
ABM - INTERNAL FAULT
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTCs.
With the DRBIII
t, erase DTCs.
Turn the ignition off.
Turn the ignition on.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display PCI BUS LOOPBACK?
All
Yes
→ Go To 2
No
→ Go To 6
2
Turn the ignition off.
Disconnect the ABM harness connector.
Inspect the ABM/ABM harness connector for damage.
Is there any broken, bent, pushed out, corroded or spread terminals?
All
Yes
→ Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the ABM harness connector.
Turn the ignition on.
Measure the voltage of the Fused Run Relay Output circuit.
Is the voltage above 10 volts?
All
Yes
→ Go To 4
No
→ Repair the Fused Run Relay Output circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
61
BRAKES (25E)
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the ABM harness connector.
Measure the voltage of the ABS Valve Fused B(+) circuit.
Is the voltage above 10 volts?
All
Yes
→ Go To 5
No
→ Repair the ABS Valve Fused B(+) circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
5
Turn the ignition off.
Disconnect the ABM harness connector.
Measure the resistance of the ground circuits.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Anti-Lock Brake Module in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Repair the ground circuit(s) for an open.
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.
62
BRAKES (25E)
PCI BUS LOOPBACK —
Continued
Symptom:
PCI BUS SHORTED TO GROUND
When Monitored and Set Condition:
PCI BUS SHORTED TO GROUND
When Monitored:
Ignition On - Continuously
Set Condition:
When the ABM detects PCI Bus is shorted to ground for more than 10
seconds.
POSSIBLE CAUSES
INTERMITTENT DTC
DAMAGED ABM/ABM HARNESS CONNECTOR
FUSED RUN RELAY OUTPUT CIRCUIT OPEN
ABS VALVE FUSED B(+) CIRCUIT OPEN
ABM - GROUND CIRCUIT OPEN
PCI BUS CIRCUIT OPEN
ABM - INTERNAL FAULT
PCI BUS CIRCUIT SHORT TO VOLTAGE
PCI BUS CIRCUIT SHORT TO GROUND
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTCs.
With the DRBIII
t, erase DTCs.
Turn the ignition off.
Turn the ignition on.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display PCI BUS SHORTED TO GROUND?
All
Yes
→ Go To 2
No
→ Go To 9
2
Turn the ignition off.
Disconnect the ABM harness connector.
Inspect the ABM/ABM harness connector for damage.
Is there any broken, bent, pushed out, corroded or spread terminals?
All
Yes
→ Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 3
63
BRAKES (25E)
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the ABM harness connector.
Turn the ignition on.
Measure the voltage of the Fused Run Relay Output circuit.
Is the voltage above 10 volts?
All
Yes
→ Go To 4
No
→ Repair the Fused Run Relay Output circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Disconnect the ABM harness connector.
Measure the voltage of the ABS Valve Fused B(+) circuit.
Is the voltage above 10 volts?
All
Yes
→ Go To 5
No
→ Repair the ABS Valve Fused B(+) circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
5
Turn the ignition off.
Disconnect the ABM harness connector.
Measure the resistance of the ground circuits.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 6
No
→ Repair the ground circuit(s) for an open.
Perform ABS VERIFICATION TEST - VER 1.
6
Turn the ignition off.
Disconnect the ABM harness connector.
Turn the ignition on.
Measure the voltage of the PCI Bus circuit.
Is there any voltage present?
All
Yes
→ Repair the PCI Bus circuit for a short to voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 7
7
Turn the ignition off.
Disconnect the ABM harness connector.
Measure the resistance between ground and the PCI Bus circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the PCI Bus circuit for a short to ground.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 8
64
BRAKES (25E)
PCI BUS SHORTED TO GROUND —
Continued
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