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Home >> Lincoln >> 2007 >> Town Car Designer, 4.6 W >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Diagnostic Tests >> Anti-Lock Control >> Inspection and Verification

Inspection and Verification

  1. Verify the customer concern.
  2. Verify the stoplamps operate correctly by applying and releasing the brake pedal with the ignition switch in the OFF 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
    • Base brake system
    • Incorrectly inflated tires
    • Mismatched wheels or tires
    • Hydraulic control unit (HCU)
    • Battery junction box (BJB) fuse(s):
      • 106 (40A)
      • 109 (20A)
    • Central junction box (CJB) fuse(s):
      • 13 (10A)
      • 14 (20A)
      • 28 (7.5A)
    • Damaged connectors or connections
    • Circuitry
    • Front wheel speed sensor jumper harness
    • Wheel speed sensor
    • Stoplamp switch
    • Anti-lock brake system (ABS) module
    4. NOTE: Make sure to use the latest scan tool software release.
  4. If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
    5. NOTE: The vehicle communication module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM.
  5. 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.
  6. 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 powertrain control module (PCM).
  7. 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 diagnostic trouble codes (DTCs).
  8. Clear the continuous DTCs and carry out the self-test diagnostics for the anti-lock brake system (ABS) module.
  9. If the DTCs retrieved are related to the concern, go to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX . For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES article.
  10. If no DTCs related to the concern are retrieved, go to Symptom Chart .
ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX

DTC Description Source Action
B1342 ECU is Defective ABS Module INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module .
B1484 Brake Pedal Input Open Circuit ABS Module Go to Pinpoint Test D .
B1596 Service Continuous Codes ABS Module
NOTE: If other DTCs are present, REPAIR them before installing a new component.
TURN the ignition switch to the OFF position and wait at least 30 seconds. Turn the ignition switch to the ON position. REPEAT the ABS self-test. If any DTCs are retrieved, REFER to the ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX . If no DTCs are retrieved, CARRY OUT a drive test above 15 km/h (9 mph), then REFER to the Symptom Chart .
B1676 Battery Voltage Out of Range ABS Module Go to Pinpoint Test E .
C1145 Speed Wheel Sensor RF Input Circuit Failure ABS Module Go to Pinpoint Test B .
C1155 Speed Wheel Sensor LF Input Circuit Failure ABS Module Go to Pinpoint Test B .
C1165 Speed Wheel Sensor RR Input Circuit Failure ABS Module Go to Pinpoint Test B .
C1175 Speed Wheel Sensor LR Input Circuit Failure ABS Module Go to Pinpoint Test B .
C1222 Speed Wheel Mismatch ABS Module Make sure the tires are the same size and correctly inflated. INSPECT the wheel speed sensor rings. CLEAR the DTC. TEST drive the vehicle. REPEAT the self-test.
C1266 ABS Valve Power Relay Circuit Failure ABS Module Go to Pinpoint Test J .
C1296 Wheel Speed LF Signal Fault ABS Module Go to Pinpoint Test C .
C1297 Wheel Speed RF Signal Fault ABS Module Go to Pinpoint Test C .
C1298 Wheel Speed RR Signal Fault ABS Module Go to Pinpoint Test C .
C1299 Wheel Speed LR Signal Fault ABS Module Go to Pinpoint Test C .
C1300 ABS Hydraulic Pump Motor Circuit Failure ABS Module Go to Pinpoint Test A .
C1805 Mismatched PCM and ABS Modules Do Not Match ABS Module CHECK the part numbers. INSTALL the correct module.
C2775 TC ON/OFF Switch Stuck Failure ABS Module Go to Pinpoint Test H .
U0073 Control Module Communication Bus Off CAN Bus REFER to MODULE COMMUNICATIONS NETWORK article.
U1900 CAN Communication Bus Fault - Receive Error CAN Bus REFER to MODULE COMMUNICATIONS NETWORK article.
U2023 Fault Received From External Node CAN Bus REFER to MODULE COMMUNICATIONS NETWORK article.
U2050 No Application Present ABS Module CONFIGURE the ABS module. REFER to MODULE CONFIGURATION article. CLEAR the DTCs. RETRIEVE the DTCs and VERIFY successful module configuration. 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.
U2051 One or More Calibration Files Missing or Corrupt ABS Module CALIBRATE the ABS module, follow the directions on the scan tool. CLEAR the DTCs. CARRY OUT the ABS module self-test. RETRIEVE and RECORD any DTCs. If DTC U2051 is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . CLEAR the DTC. REPEAT the self-test.
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