TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
Make sure the Pump Motor connector is secure
If there are no potential causes remaining, replace the Fuse.
If there are no possible causes remaining, view repair.
All
Repair
Replace the ABS Pump Motor Fuse. The CAB must sense all four
wheels at 25 km/h (15 mph) before it will extinguish the ABS
Indicator.
Perform ABS VERIFICATION TEST - VER 1.
8
Turn the ignition off.
Remove the ABS PUMP Fuse #4 from the Power Distribution Center (PDC).
Disconnect the CAB connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance of the Fused B (+) circuit between the PDC Fuse Terminal
and the CAB connector.
Is the resistance below 10 ohms?
All
Yes
→
No
→
Repair the Fused B(+) circuit for an open. Make sure the Pump
Motor connector is secure. The CAB must sense all four wheels at
25 km/h (15 mph) before it will extinguish the ABS Indicator.
Perform ABS VERIFICATION TEST - VER 1.
9
Turn the ignition on.
Using a 12-volt test light connected to ground, check the B+ supply to Fuse 4 in the
PDC.
Is the B+ supply OK?
All
Yes
→
No
→
Repair the B+ supply for an open. Make sure the Pump Motor
connector is secure. The CAB must sense all four wheels at 25
km/h (15 mph) before it will extinguish the ABS Indicator.
Perform ABS VERIFICATION TEST - VER 1.
10
Turn the ignition off.
Disconnect Pump Motor Connector.
Connect a 10 gauge jumper wire between pump motor Fused B (+) circuit and a 40
Amp Fused B (+) circuit.
Connect a 10 gauge jumper wire between pump motor ground circuit and a known
good body ground.
Monitor Pump Motor operation.
Is the pump motor running?
All
Yes
→
No
→
Replace the ABS Pump Motor/Hydraulic Control Unit assembly.
Make sure the Pump Motor connector is secure. The CAB must
sense all four wheels at 25 km/h (15 mph) before it will extinguish
the ABS Indicator.
Perform ABS VERIFICATION TEST - VER 1.
45
BRAKES (CAB)
PUMP MOTOR CIRCUIT NOT WORKING PROPERLY —
Continued
