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Home >> Lincoln >> 2008 >> MKZ AWD >> Repair and Diagnosis >> Brakes >> Traction Control >> Vehicle Dynamic Systems >> Diagnostic Tests >> Anti-Lock Control >> Inspection and Verification

Inspection and Verification

  1. Verify the customer concern.
  2. Verify the stoplamps operate correctly by pressing and releasing the brake pedal with the ignition switch in the ON position. If the stoplamps do not operate correctly, refer to EXTERIOR LIGHTING article. If the stoplamps operate correctly, proceed to the next step.
  3. Visually inspect for obvious signs of mechanical or electrical damage.
    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Incorrectly inflated tires
    • Mismatched wheels or tires on vehicle
    • Base brake system
    • Wheel speed sensor
    • Wheel speed sensor tone ring
    • Hydraulic control unit (HCU)
    • Battery junction box (BJB) fuse(s):
      • 8 (40A)
      • 10 (20A)
      • 49 (15A)
    • Smart junction box (SJB) fuse 28 (10A)
    • Wiring, terminals or connectors
    • Stoplamp switch
    • Traction control switch
    • Wheel speed sensors
    • ABS module
  4. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
    5. NOTE: Make sure to use the latest scan tool software release.
  5. If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
    6. NOTE: The vehicle communication module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM.
  6. If the scan tool does not communicate with the VCM:
    • check the VCM connection to the vehicle.
    • check the scan tool connection to the VCM.
    • refer to MODULE COMMUNICATIONS NETWORK article, No Power To The Scan Tool, to diagnose no communication with the scan tool.
  7. If the scan tool does not communicate with the vehicle:
    • verify the ignition key is in the ON position.
    • verify the scan tool operation with a known good vehicle.
    • refer to MODULE COMMUNICATIONS NETWORK article to diagnose no response from the PCM.
  8. Carry out the network test.
    • If the scan tool responds with no communication for one or more modules, refer to MODULE COMMUNICATIONS NETWORK article.
    • If the network test passes, retrieve and record continuous memory DTCs.
  9. Clear the continuous DTCs and carry out the self-test diagnostics for the ABS module.
  10. If the DTCs retrieved are related to the concern, go to the ABS Module DTC Chart or the Instrument Cluster DTC Chart. For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES article.
  11. If no DTCs related to the concern are retrieved, go to Symptom Chart .
ABS MODULE DTC CHART

DTCs Description Source Action
B1342 ECU is Faulted ABS Module CLEAR the DTCs. RETRIEVE the DTCs. REPEAT the self-test. If other DTCs are retrieved, ADDRESS those DTCs before addressing DTC B1342. If only DTC B1342 is retrieved, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . REPEAT the self-test.
B1483 Brake Pedal Input Open Circuit ABS Module Go to Pinpoint Test A .
B1676 Battery Pack Voltage Out of Range ABS Module Go to Pinpoint Test B .
B2900 VIN Mismatch ABS Module If DTC U1900 is also present, REPAIR that DTC before repairing B2900.
VERIFY the vehicle information number (VIN) information retrieved by the scan tool matches the VIN tag on the vehicle. If the VIN does not match, RECONFIGURE the PCM. CLEAR the DTC. REPEAT the self-test. If the VIN matches, INSTALL a new ABS module. CLEAR the DTC. REPEAT the self-test.
C1095 ABS Hydraulic Pump Motor Circuit Failure ABS Module Go to Pinpoint Test E .
C1145 Wheel Speed Sensor RF Input Circuit Failure ABS Module Go to Pinpoint Test C .
C1155 Wheel Speed Sensor LF Input Circuit Failure ABS Module Go to Pinpoint Test C .
C1165 Wheel Speed Sensor RR Input Circuit Failure ABS Module Go to Pinpoint Test C .
C1175 Wheel Speed Sensor LR Input Circuit Failure ABS Module Go to Pinpoint Test C .
C1233 Wheel Speed LF Signal Fault ABS Module Go to Pinpoint Test D .
C1234 Wheel Speed RF Signal Fault ABS Module Go to Pinpoint Test D .
C1235 Wheel Speed RR Signal Fault ABS Module Go to Pinpoint Test D .
C1236 Wheel Speed LR Signal Fault ABS Module Go to Pinpoint Test D .
C1288 Pressure Sensor Main/Primary Input Circuit Failure ABS Module CLEAR the DTCs. REPEAT the self-test. If DTC C1288 is present, make sure all HCU and ABS module fasteners are tightened to their correct torque specification. If all fasteners are tightened to their correct torque specification, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) .
C1440 Pressure Sensor Main/Primary Signal Faulted ABS Module CLEAR the DTCs. REPEAT the self-test. If DTC C1440 is present, make sure all HCU and ABS module fasteners are tightened to their correct torque specification. If all fasteners are tightened to their correct torque specification, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) .
C1805 Mismatched PCM and/or ABS Module ABS Module If DTC U1900 is also present, REPAIR that DTC before repairing C1805.
The messages received by the ABS module from the PCM do not match what the ABS module is expecting. VERIFY that the ABS module installed is the correct module for the vehicle configuration. If the ABS module is OK, RECONFIGURE the PCM as necessary. FOLLOW the scan tool directions. CLEAR the DTC. REPEAT the self-test.
U1900 CAN communication Bus Fault - Receive Error ABS Module REFER to MODULE COMMUNICATIONS NETWORK article to diagnose the high-speed controller area network (HS-CAN) bus.
U2050 No Application Present ABS Module VERIFY that the ABS module installed is the correct module for the vehicle configuration. If the ABS module is OK, CLEAR the DTCs. CARRY OUT the self-test, RETRIEVE and RECORD any DTCs. If DTC U2050 is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . CLEAR the DTC. REPEAT the self-test.
U2023 One or More Calibration Files Missing or Corrupt ABS Module Invalid data has been received by the ABS module from another module. REFER to MODULE COMMUNICATIONS NETWORK article to diagnose the HS-CAN bus.
INSTRUMENT CLUSTER DTC CHART

DTC Description Source Action
C1093 Traction Control Disable Switch Circuit Failure Instrument Cluster Go to Pinpoint Test G .
- All Other Instrument Cluster DTCs Instrument Cluster REFER to INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES article.
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