Antilock Brakes / Traction Control Systems

Diagnostic Routine A

Diagnostic Overview

U3003:16

Refer to Wiring Diagram Set 42 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

The ABS (Anti-Lock Brake System) module, hydraulic pump and solenoid valves require an operating voltage that is between 10 and 17 volts. The ABS (Anti-Lock Brake System) module receives this voltage from the BJB (Battery Junction Box). The ABS (Anti-Lock Brake System) module has a single ground circuit located in the engine compartment wiring harness. Excessive resistance or an open in one or more of these circuits, a discharged battery or a inoperative charging system will result in the ABS (Anti-Lock Brake System) module setting a DTC (Diagnostic Trouble Code).

DTC Fault Trigger Conditions






Visual Inspection and Diagnostic Pre-checks

- Make sure the vehicle battery terminals and cables are free of any corrosion and other contaminants.

- Make sure the vehicle battery terminals are tightened to their correct torque specifications.

- Make sure BJB (Battery Junction Box) fuses 5 (50A), 43 (40A) and 92 (10A) are OK.

Pinpoint Test

1. RECHECK THE ABS (Anti-Lock Brake System) MODULE DTCs (Diagnostic Trouble Codes)

1. Ignition ON.

2. Using a scan tool, clear the ABS (Anti-Lock Brake System) module DTCs (Diagnostic Trouble Codes).

3. Ignition OFF.

4. Ignition ON.

5. Using a scan tool, carry out the ABS (Anti-Lock Brake System) module self-test.

Is DTC (Diagnostic Trouble Code) U3003:16 still present?






2. CHECK FOR CHARGING SYSTEM DTCs (Diagnostic Trouble Codes) IN THE PCM

1. Using a scan tool, retrieve all CMDTCs (Continuous Memory Diagnostic Trouble Codes).

Is DTC (Diagnostic Trouble Code) B1317, B1318, B1676, U3003:16 or U3003:17 present in one or more modules AND are any charging system DTCs (Diagnostic Trouble Codes) present in the PCM (Powertrain Control Module)?






3. CHECK THE BATTERY CONDITION AND STATE OF CHARGE

1. Carry out the Battery Condition Test. REFER to Diagnostic Routine A: Battery Condition Test Pinpoint Tests.

Did the battery pass the condition test?






4. CHECK THE ABS (Anti-Lock Brake System) MODULE SUPPLY VOLTAGE (VPWR_ABS) PID (Parameter Identification)

1. Ignition ON.

2. Measure and record the voltage at the battery.

3. Using a scan tool, monitor the VPWR_ABS PID (Parameter Identification).

Is the PID (Parameter Identification) display within 0.2 volt of the recorded battery voltage?






5. CHECK THE ABS (Anti-Lock Brake System) MODULE VOLTAGE SUPPLY

1. Ignition OFF.

2. Disconnect ABS (Anti-Lock Brake System) Module electrical connector.

3. Ignition ON.

4. Measure:





Is each voltage within 0.2 volt of the recorded battery voltage?






6. CHECK THE ABS (Anti-Lock Brake System) MODULE GROUND CIRCUIT FOR AN OPEN

1. Ignition OFF.

2. Disconnect the battery negative cable. REFER to Battery Disconnect .

3. Measure:





Is the resistance less than 3 ohms?






7. CHECK FOR CORRECT ABS (Anti-Lock Brake System) MODULE OPERATION

1. Ignition OFF.

2. Disconnect and inspect the ABS (Anti-Lock Brake System) Module electrical connector (if not previously disconnected).

3. Repair:

- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

4. Connect the ABS (Anti-Lock Brake System) Module electrical connector. Make sure it seats and latches correctly.

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

Is the concern still present?