Possible Causes

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Incorrect sensor input
Air in the system
EBB unit (HCU and ABS module assembly)

AM1: Check For DTC C0040:64, U3003:16 OR U3003:17

Review the results from the ABS module self-test.
Is DTC C0040:64, U3003:16 or U3003:17 present?

Yes	No
For DTC C0040:64, GO to Pinpoint Test AC. For DTC U3003:16, GO to Pinpoint Test A. For DTC U3003:17, GO to Pinpoint Test F.	Go to AM2.

AM2: Recheck For The ABS Module DTCs

Ignition ON, engine OFF.
Clear the ABS DTCs.
Put the ABS module in sleep mode by performing the following steps:
- With ALL doors closed, set the ignition from ON to OFF.
- Disconnect the diagnostic scan tool.
- Open the door, exit the vehicle and close the door.
- Wait a minimum of 90 seconds for the ABS module to enter sleep mode.
Ignition ON, engine OFF.
Carry out the ABS self-test.
Are any DTCs shown in the ABS DTC Fault Trigger Conditions table present?

Yes	No
Go to AM5.	The system is operating correctly. The concern may have been caused by a temporary condition.

AM3: Calibrate The ABS Module

NOTE: The vehicle must be on level ground and at a complete standstill during Interactive Vehicle Dynamics (IVD) Initialization. Any vehicle movement results in false values for this test.

Using a diagnostic scan tool, carry out the IVD Initialization routine. Follow the diagnostic scan tool directions.
Ignition OFF.
Ignition ON, engine OFF.
Clear the ABS DTCs.
Ignition OFF.
Ignition ON, engine OFF.
Carry out the ABS self-test.
Is DTC C0044:54 present?

Yes	No
Go to AM6.	If DTC C1A08:1C or any other C0044:XX DTC is present, Go to AM4. For all other ABS module DTCs, GO to the DTC Chart: ABS Module.

AM4: Check The ABS Module-To-HCU Fasteners
- Ignition OFF.
- Verify all ABS module-to-HCU fasteners are tightened to specifications. Refer to ABS Module Removal and Installation in the Anti-Lock Brake System (ABS) and Stability Control article.
- Ignition ON, engine OFF.
- Clear the ABS DTCs.
- Ignition OFF.
- Ignition ON, engine OFF.
  Carry out the ABS self-test.
- Is DTC C0044:49, C0044:8F or C1A08:1C present?
AM5: Bleed The Brake System And Recheck For DTC C0044:64
- Inspect the brake tubes and connections for damage and leaks. Repair or install new brake tubes as necessary.
- Bleed the brake system. Refer to the Brake System General Information article.
- Using a diagnostic scan tool, carry out the pressure sensor calibration routine.
- Ignition ON, engine OFF.
- Connect a battery charger to the 12-volt battery.
- Allow the vehicle to sit for 60 minutes with the ignition on.
- Clear the ABS DTCs.
- Disconnect the battery charger.
- Put the ABS module in sleep mode by performing the following steps:
  - With ALL doors closed, set the ignition from ON to OFF.
  - Disconnect the diagnostic scan tool.
  - Open the door, exit the vehicle and close the door.
  - Wait a minimum of 90 seconds for the ABS module to enter sleep mode.
- Ignition ON, engine OFF.
Carry out the ABS self-test.
- Are any DTCs shown in the ABS DTC Fault Trigger Conditions table present?

AM6: Check For Correct ABS Operation

Ignition OFF.
ABS Module connector disconnected.
Inspect all disconnected electrical connectors for the following:
- corrosion - install new connector or terminal - clean module pins
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary
- spread terminals - install new terminals as necessary
ABS Module connector connected. Make sure the connector seats and latches correctly.
Is the concern still present?

Yes	No
CHECK OASIS for any service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HCU and ABS module assembly. REFER to the Anti-Lock Brake System (ABS) and Stability Control article.	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

AM7: Check For Correct ABS Operation

Put the ABS module in sleep mode by performing the following steps:
- With ALL doors closed, set the ignition from ON to OFF.
- Disconnect the diagnostic scan tool.
- Open the door, exit the vehicle and close the door.
- Wait a minimum of 90 seconds for the ABS module to enter sleep mode.
ABS_B Module connector disconnected. (C135B)
ABS_A Module connector disconnected. (C135A)
Inspect all disconnected electrical connectors for the following:
- corrosion - install new connector or terminal - clean module pins
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary
- spread terminals - install new terminals as necessary
ABS_B Module connector connected. (C135B) Make sure the connector seats and latches correctly.
ABS_A Module connector connected. (C135A) Make sure the connector seats and latches correctly.
Is the concern still present?

Yes	No
The HCU and ABS module are a single assembly known as the EBB unit. CHECK OASIS for any service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new EBB unit. REFER to the Anti-Lock Brake System (ABS) and Stability Control article.	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.