C1073-ABS PUMP MOTOR CONTROL CIRCUIT





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    With the ignition on.

  • Set Condition:

    The ABM detects low pump motor feedback voltage with actuation of the pump motor relay.


Possible Causes
  
BLOWN PUMP FUSE
  
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.






NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be meet.



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
  • Go To 2


No

2.CHECK THE ABS PUMP MOTOR FUSED B+ FOR AN OPEN




Is the ABS Pump Motor B+ fuse open?

Yes
  • Go To 3


No
  • Go To 5

3.CHECK THE (A107) FUSED B(+) FOR A SHORT TO GROUND






Does the test light illuminate brightly?

Yes


No
  • Go To 4

4.CHECK THE (A107) FUSED B(+) CIRCUIT




Is the wiring harness OK?

Yes
  • Go To 5


No

5.CHECK THE VOLTAGE ON THE (A107) FUSED B(+) CIRCUIT






Is the voltage above 10 volts?

Yes
  • Go To 6


No

6.CHECK THE (Z107) GROUND CIRCUIT FOR AN OPEN





Is the resistance below 5.0 ohms?

Yes


No