TEST ACTION APPLICABILITY
3 Turn the ignition off.
Disconnect the CAB 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 CAB 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 CAB harness connector.
Measure the voltage of the ABS Pump Fused B(+) circuit.
Is the voltage above 10 volts?
All
Yes → Go To 6
No → Repair the ABS Pump Fused B(+) circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
6 Turn the ignition off.
Disconnect the CAB harness connector.
Measure the resistance of the ground circuits.
Is the resistance below 5.0 ohms?
All
Yes → Go To 7
No → Repair the ground circuit(s) for an open.
Perform ABS VERIFICATION TEST - VER 1.
7 Turn the ignition off.
Disconnect the CAB 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 8
8 Turn the ignition off.
Disconnect the CAB 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 9
28
BRAKES (CAB)
PCI BUS COMMUNICATION FAULT — Continued
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