Have you checked to see if getting power to the pump?
If it is the 2 wire connector that is hard wired into the abs pump ( on one end )
then no is cant get power with the key forward , and even tried running vehicle.
Should their be constant power ? What if i jumped power to the positive side to see if the light goes out ?
The most likely cause for 'pump circuit malfunction' is a fault in the ABS control module. The module is the black box attached to the hydraulic control unit.
The ABS control module gives power and ground to the pump motor.
PUMP CIRCUIT FAILURE
When Monitored and Set Condition:
When Monitored: Ignition on. The CAB commands the pump on at 20 km/h (12 mph) to
check its operation, if the brake switch is not applied. If the brake is applied, the test will
run at 40 km/h (25 mph). The CAB monitors pump voltage every 7 milliseconds.
Set Condition: The DTC is stored when the CAB detects: 1) Improper voltage decay after
the pump was turned off. 2) Pump not energized by the CAB, but voltage is present for 3.5
seconds. 3) Pump is turned on by the CAB, but without sufficient voltage to operate it.
PUMP HARNESS DISCONNECTED
CAB - PUMP MOTOR RUNNING CONTINUOUSLY
ABS PUMP MOTOR INTERMITTENT DTC
GROUND CIRCUIT HIGH RESISTANCE
FUSED B(+) CIRCUIT OPEN
GROUND CIRCUIT OPEN
CAB - INTERNAL FAULT
CAB - SETTING FALSE CODE
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Turn the ignition on.
Monitor the pump motor for continuous operation.
Is the pump motor running continuously?
Yes ® Replace the Controller Anti-Lock Brake in accordance with the
Service Information. The vehicle must be driven at 25 km/h (15
mph) to extinguish the ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
No ® Go To 2
2 Turn the ignition on.
With the DRBIIIt, read DTC's.
With the DRBIIIt, erase DTC's.
Turn the ignition off.
With the DRBIIIt, actuate the ABS pump motor.
Did the Pump Motor operate when actuated?
Yes ® Go To 3
No ® Go To 4
3 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?
Yes ® Repair as necessary. The vehicle must be driven at 25 km/h (15
No ® Replace the Controller Anti-Lock Brake in accordance with the
4 Check the short Wiring Harness between the ABS Pump and the CAB.
Check for disconnect and damage.
Is the harness disconnected or damaged?
Yes ® Reconnect or repair the Pump Harness as necessary.
No ® Go To 5
5 Turn the ignition off.
Disconnect CAB Connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance of the CAB ground circuits.
Is the resistance below 1.0 ohm?
Yes ® Go To 6
No ® Repair the ground circuit for an open. The vehicle must be driven
at 25 km/h (15 mph) to extinguish the ABS indicator.
6 Turn the ignition on.
With the DRBIIIt, enable pump motor actuation.
NOTE: Pump motor will not operate, but voltage will be applied.
Measure the voltage drop across theABS ground circuit connection, with pump motor
Is the voltage below 0.1 volt?
Yes ® Go To 7
No ® Repair the Ground circuit for high resistance. The vehicle must be
driven at 25 km/h (15 mph) to extinguish the ABS indicator.
PUMP CIRCUIT FAILURE - Continued
7 Turn the ignition off.
Disconnect the CAB connector.
Using a 12-volt test light connected to ground, check the Pump Motor Fused B+
Does the test light illuminate brightly?
Yes ® Go To 8
No ® Repair the Fused B(+) circuit for an open. The vehicle must be
8 If there are no possible causes remaining, view repair. All
Replace the Controller Anti-Lock Brake in accordance with the
See the above posts for information.
Check all the powers and grounds with a test light.
A scan tool is necessary to actuate the pump motor.
Let me know if you have any more questions.