C1073–ABS PUMP MOTOR CONTROL CIRCUIT
For a complete wiring diagram Refer to Section 8W.
Possible Causes
|
BLOWN PUMP FUSE
|
WIRING HARNESS, TERMINAL, CONNECTOR DAMAGE
|
HIGH RESISTANCE IN B+ CIRCUITS
|
HIGH RESISTANCE IN GROUND CIRCUITS
|
INTEGRATED CONTROL UNIT
|
Diagnostic Test
1.
CHECK FOR A DTC C1073-ABS PUMP MOTOR CONTROL CIRCUIT
NOTE:
This DTC must be active for the results of this test to be valid.
Turn the ignition on.
With the scan tool, record and erase DTCs.
Cycle the ignition switch from off to on.
Road test the vehicle over 40 km/h (25 mph).
NOTE:
Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met.
With the scan tool, read DTCs
NOTE:
The Anti-Lock Brake Module must sense ALL 4 wheels at 12 km/h (7.5 mph) before it will extinguish the ABS indicators.
Does the scan tool display: C1073-ABS PUMP MOTOR CONTROL CIRCUIT?
Yes
No
2.
INSPECT RELATED WIRING HARNESS, TERMINALS, & CONNECTORS
Turn the ignition off.
Visually inspect the related wiring harness. Look for any pinched, chafed, pierced, and partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, and corroded terminals.
Were any problems found?
Yes
No
3.
CHECK THE ABS PUMP MOTOR FUSED B+ FOR AN OPEN
Turn the ignition off.
Remove and visually inspect the ABS Pump Motor B+ fuse.
Is the ABS Pump Motor B+ fuse open?
Yes
No
4.
CHECK THE (A107) FUSED B(+) FOR A SHORT TO GROUND
Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Using a 12–volt test light connected to 12–volts, probe the (A107) Fused B+ circuit.
Does the test light illuminate brightly?
Yes
No
5.
CHECK THE (A107) FUSED B(+) CIRCUIT
Turn the ignition off.
Visually inspect the (A107) Fused B(+) circuit in the wiring harness.
Look for any signs of intermittent short to ground.
Is the wiring harness OK?
Yes
No
6.
CHECK THE VOLTAGE ON THE (A107) FUSED B(+) CIRCUIT
Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Measure the voltage of the (A107) Fused B(+) circuit in the Anti-Lock Brake Module harness connector.
Is the voltage above 10 volts?
Yes
No
7.
CHECK THE (Z907) AND (Z917) GROUND CIRCUITS FOR AN OPEN
Measure the resistance of the (Z907) and (Z917) Ground circuits between the Anti-Lock Brake Module harness connector and ground
Is the resistance below 5.0 ohms?
Yes
No