Pinpoint Test Y: Abs (Anti-Lock Brake System) Module Internal Fault Concern

Refer to Vehicle Dynamic Systems for schematic and connector information.

Normal Operation and Fault Conditions

The ABS module carries out self tests during operation, the module also monitors various inputs and compares the values to what should be expected. If the values received are out of range, are not what is expected, or if any of the self tests fail, the ABS module sets a DTC.

The U3000:XX Diagnostic Trouble Codes (DTCs) may set along with other ABS Diagnostic Trouble Codes (DTCs). Diagnose all other ABS module Diagnostic Trouble Codes (DTCs) before diagnosing any ABS module U3000:XX Diagnostic Trouble Codes (DTCs).

REFER to: Anti-Lock Brake System (ABS) and Stability Control - Diesel/Flex Fuel - Ethanol/Full Hybrid Electric Vehicle (FHEV)/Gasoline - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
ABS C101F:49	Generic Valve Failure: Internal Electronic Failure	This DTC sets due to incomplete or improper module programming procedures.
ABS C1A08:1C	Pressure Sensor Supply: Circuit Voltage Out Of Range	This DTC sets when the ABS module detects an internal fault.
ABS C1A99:01	Pressure Sensor: General Circuit/Electrical Failure	This DTC sets when the brake fluid line hydraulic pressure sensor signal circuit located inside the ABS module has failed.
ABS C1A99:28	Pressure Sensor: Signal Bias Level Out Of Range/Zero Adjustment Failure	This DTC indicates the brake fluid line hydraulic pressure sensor located inside the HCU has failed.
ABS C1A99:49	Pressure Sensor: Internal Electronic Failure	This DTC indicates the brake fluid line hydraulic pressure sensor located inside the HCU has failed.
ABS U3000:00	Control Module: No Sub Type Information	Sets when the ABS module detects an internal hardware fault.
ABS U3000:04	Control Module: System Internal Failure	Sets when the ABS module detects an internal fault.
ABS U3000:41	Control Module: General Checksum Failure	Sets when the ABS module detects an internal fault.
ABS U3000:44	Control Module: Data Memory Failure	Sets when the ABS module detects an internal hardware fault.
ABS U3000:45	Control Module: Program Memory Failure	Sets when the ABS module detects an internal fault.
ABS U3000:47	Control Module: Watchdog/Safety μC Failure	Sets when the ABS module detects an internal fault.
ABS U3000:48	Control Module: Supervision Software Failure	Sets when the ABS module detects an internal fault.
ABS U3000:49	Control Module: Internal Electronic Failure	This DTC sets when excessive temperature is detected within the ABS module.
ABS U3000:4B	Control Module: Over Temperature	Sets when the ABS module detects an internal hardware fault.
ABS U3000:96	Control Module: Component Internal Failure	Sets when the ABS module detects an internal fault.

Possible Causes

Incorrect sensor input
Stuck valve
EBB unit

Visual Inspection and Pre-checks

Diagnose all other ABS module Diagnostic Trouble Codes (DTCs) before diagnosing any U3000:XX Diagnostic Trouble Codes (DTCs).

Y1 GUIDED DIAGNOSTIC QUESTION
- This step is for vehicles equipped with an EPB system or an EBB unit.
Were you sent here from diagnostics in Auxiliary Braking information?

Yes GO to Y3

No GO to Y2

Y2 RECHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE FOR DTC (DIAGNOSTIC TROUBLE CODE) S

Ignition ON.

NOTE: If DTC U3000:4B is present, allow the vehicle to cool for a minimum of 30 minutes.

Using a diagnostic scan tool, clear the ABSDTC s.

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.

Using a diagnostic scan tool, carry out the ABS self-test.

Record the ABS module DTC s.

Are any of the DTC s from the Fault Trigger Conditions table present and active in the ABS module?

Yes

GO to Y3

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

Y3 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION

Ignition OFF.

Disconnect ABS module connector C135.

Using a good light source, inspect the electrical connector for the following:
- Corrosion - INSTALL new connector or terminal and clean the 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

Connect ABS module connector C135. Make sure the connector seats and latches correctly..

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	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 module. REFER to: Electric Brake Booster (EBB) .

No	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.