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Inspection and Verification

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: This section contains information that is specific to the Escape Hybrid brake system.
    WARNING: The traction battery and the charging system contain high voltage components and wiring. High voltage insulated safety gloves and a face shield must be worn when carrying out any diagnostics on this vehicle. Failure to follow these instructions may result in severe personal injury or death.
    NOTE: The anti-lock brake system (ABS) module is part of the hydraulic control unit (HCU). Do not separate the ABS module from the HCU for any reason.
  1. Verify the customer concern.
  2. Visually inspect for obvious signs of mechanical or electrical damage.
    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Brake fluid level
    • Brake system hydraulics
    • Brake system hydraulic lines and hoses
    • Base brake system
    • ABS module
    • Circuitry
    • Battery junction box (BJB) fuse(s):
      • 1 (5A)
      • 10 (30A)
      • 15 (20A)
      • 24 (50A)
      • 31 (50A)
    • Smart junction box (SJB) fuse 34 (5A)
    • Parking brake switch
  3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  4. If the cause is not visually evident, connect the diagnostic tool to the data link connector and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
    • check that the program card is correctly installed.
    • check the connections to the vehicle.
    • check the ignition switch position.
  5. If the diagnostic tool does not power up, refer to the diagnostic tool manual .
  6. Carry out the data link diagnostic test. If the diagnostic tool responds with:
    • CAN or ISO circuits, all electronic control units no response/not equipped, refer to MODULE COMMUNICATIONS NETWORK .
    • No response/not equipped for the ABS module, refer to VEHICLE DYNAMIC SYSTEMS .
    • System passed, retrieve and record the continuous diagnostic trouble codes (DTC) and carry out self-test diagnostics for the ABS module.
    7. NOTE: Always retrieve the continuous DTCs after running the self-test.
  7. If the DTCs retrieved are related to the concern, go to the ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX  to continue diagnosis.
  8. If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART  to continue diagnosis.
NOTE: Some DTCs can be caused by hydraulic leaks in the circuit. A thorough visual inspection must be carried out on the entire brake system before attempting to service any DTCs. Repair any leaks or base brake concerns before continuing to the Anti-Lock Brake System (ABS) Module Diagnostic Trouble Code (DTC) Index.
ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX

DTC Description Source Action
B1342 ECU Is Faulted ABS Module CLEAR the DTCs. DRIVE the vehicle. VERIFY that the red brake warning indicator is not illuminated. REPEAT the self-test. If DTC B1342 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
B2900 VIN Mismatch ABS Module VERIFY that the module has the correct as-built data. REFER to MODULE CONFIGURATION .
C1187 Brake Fluid Level Sensor Input Open Circuit ABS Module GO to PINPOINT TEST B .
C1188 Brake Fluid Level Sensor Input Short Circuit To Battery ABS Module GO to PINPOINT TEST B .
C1189 Brake Fluid Level Sensor Input Short Circuit To Ground ABS Module GO to PINPOINT TEST B .
C1288 Pressure Transducer Main/Primary Circuit Failure ABS Module CLEAR the DTCs. DRIVE the vehicle. VERIFY that the red brake warning indicator is not illuminated. REPEAT the self-test. If DTC C1288 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1310 Brake Hydraulic Pressure Transducer Front Left Wheel Circuit Failure ABS Module CLEAR the DTCs. DRIVE the vehicle. VERIFY that the red brake warning indicator is not illuminated. REPEAT the self-test. If DTC C1310 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1311 Brake Hydraulic Pressure Transducer Front Left Wheel Signal Fault ABS Module GO to PINPOINT TEST C .
C1312 Brake Hydraulic Pressure Transducer Front Right Wheel Circuit Failure ABS Module CLEAR the DTCs. DRIVE the vehicle. VERIFY that the red brake warning indicator is not illuminated. REPEAT the self-test. If DTC C1312 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1313 Brake Hydraulic Pressure Transducer Front Right Wheel Signal Fault ABS Module GO to PINPOINT TEST C .
C1314 Brake Hydraulic Pressure Transducer Rear Left Wheel Circuit Failure ABS Module CLEAR the DTCs. DRIVE the vehicle. VERIFY that the red brake warning indicator is not illuminated. REPEAT the self-test. If DTC C1314 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1315 Brake Hydraulic Pressure Transducer Rear Left Wheel Signal Fault ABS Module GO to PINPOINT TEST C .
C1316 Brake Hydraulic Pressure Transducer Rear Right Wheel Circuit Failure ABS Module CLEAR the DTCs. DRIVE the vehicle. VERIFY that the red brake warning indicator is not illuminated. REPEAT the self-test. If DTC C1316 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1317 Brake Hydraulic Pressure Transducer Rear Right Wheel Signal Fault ABS Module GO to PINPOINT TEST C .
C1318 Brake Hydraulic Pressure Transducer Accumulator Circuit Failure ABS Module CLEAR the DTCs. DRIVE the vehicle. VERIFY that the red brake warning indicator is not illuminated. REPEAT the self-test. If DTC C1318 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1319 Brake Hydraulic Pressure Transducer Accumulator Signal Fault ABS Module CLEAR the DTCs. DRIVE the vehicle. VERIFY that the red brake warning indicator is not illuminated. REPEAT the self-test. If DTC C1319 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1320 Brake Hydraulic Accumulator Travel Sensor Circuit Failure ABS Module DISCONNECT the ABS module. CHECK for corrosion or pushed out pins. CLEAR the DTCs. DRIVE the vehicle. VERIFY that the red brake warning indicator is not illuminated. REPEAT the self-test. If DTC C1320 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1321 Brake Hydraulic Accumulator Travel Sensor Signal Fault ABS Module CLEAR the DTCs. DRIVE the vehicle. VERIFY that the red brake warning indicator is not illuminated. REPEAT the self-test. If DTC C1321 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1322 Brake Hydraulic Master Cylinder Piston Travel Sensor 1 Circuit Failure ABS Module GO to PINPOINT TEST D .
C1323 Brake Hydraulic Master Cylinder Piston Travel Sensor 1 Signal Fault ABS Module GO to PINPOINT TEST D .
C1324 Brake Hydraulic Master Cylinder Piston Travel Sensor 2 Circuit Failure ABS Module GO to PINPOINT TEST D .
C1325 Brake Hydraulic Master Cylinder Piston Travel Sensor 2 Signal Fault ABS Module GO to PINPOINT TEST D .
C1327 Brake Fluid Level Low ABS Module REPAIR all other DTCs before proceeding with this pinpoint test. GO to PINPOINT TEST B .
C1328 Electro-Hydraulic General Pressure Sensor Failure ABS Module CLEAR the DTCs. CARRY OUT a software reset by cycling the ignition switch OFF. DRIVE the vehicle. VERIFY that the red brake warning indicator is not illuminated. REPEAT the self-test. If DTC C1328 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1440 Pressure Transducer Main/Primary Signal Faulted ABS Module GO to PINPOINT TEST C .
C1471 Brake System Volume Consumption Plausibility Failure ABS Module CLEAR the DTCs. CARRY OUT the service bleed procedure. REFER to BRAKE SYSTEM BLEEDING - HYBRID  in this section. If DTC C1471 is retrieved again, INSTALL a new brake master cylinder. REFER to HYDRAULIC BRAKE ACTUATION . REPEAT the self-test. If DTC C1471 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1472 Master Cylinder Pressure/Travel Plausibility Failure ABS Module CLEAR the DTCs. CARRY OUT the service bleed procedure. REFER to BRAKE SYSTEM BLEEDING - HYBRID  in this section. If DTC C1472 is retrieved again, INSTALL a new brake master cylinder. REFER to HYDRAULIC BRAKE ACTUATION . REPEAT the self-test. If DTC C1472 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1473 Brake System Valves Calibration Data Failure ABS Module Using the scan tool, CARRY OUT the Brake System Air Bleed Check. CYCLE the ignition switch and CLEAR all DTCs. CARRY OUT the ABS module self-test. If DTC C1473 is still present, CARRY OUT the Brake System Service Bleed. REFER to BRAKE SYSTEM BLEEDING - HYBRID  in this section. CYCLE the ignition switch and CLEAR all DTCs. CARRY OUT the ABS module self-test. If DTC C1473 is still present, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS .
C1474 High Pressure Accumulator (HPA) Sensor Calibration Data Failure ABS Module CLEAR the DTCs. DRIVE the vehicle. VERIFY that the red brake warning indicator is not illuminated. REPEAT the self-test. If DTC C1474 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1475 High Pressure Accumulator (HPA) Pressure/Volume/Temperature Plausibility Failure ABS Module INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1476 Brake System Pump Volume Feed Too Low Plausibility Failure ABS Module CLEAR the DTCs. CARRY OUT the service bleed procedure. REFER to BRAKE SYSTEM BLEEDING - HYBRID  in this section. REPEAT the self-test. If DTC C1476 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1477 High Pressure Hydraulic Circuit Leakage Plausibility Failure ABS Module CLEAR the DTCs. CARRY OUT the service bleed procedure. REFER to BRAKE SYSTEM BLEEDING - HYBRID  in this section. REPEAT the self-test. If DTC C1477 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1478 Front Left Wheel Brake Pressure Control Plausibility Failure ABS Module CLEAR the DTCs. DRIVE the vehicle. VERIFY that the red brake warning indicator is not illuminated. REPEAT the self-test. If DTC C1478 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1479 Rear Left Wheel Brake Pressure Control Plausibility Failure ABS Module CLEAR the DTCs. DRIVE the vehicle. VERIFY that the red brake warning indicator is not illuminated. REPEAT the self-test. If DTC C1479 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1480 Front Right Wheel Brake Pressure Control Plausibility Failure ABS Module CLEAR the DTCs. DRIVE the vehicle. VERIFY that the red brake warning indicator is not illuminated. REPEAT the self-test. If DTC C1480 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1481 Rear Right Wheel Brake Pressure Control Plausibility Failure ABS Module CLEAR the DTCs. DRIVE the vehicle. VERIFY that the red brake warning indicator is not illuminated. REPEAT the self-test. If DTC C1481 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.
C1523 Brake Fluid Level Sensor Out of Range ABS Module GO to PINPOINT TEST B .
C1524 Brake Pedal Travel Sensor Calibration Incomplete ABS Module With the transmission in PARK, APPLY the brake pedal one full stroke and completely release it. Turn the ignition switch to the OFF position. Wait at least 4 minutes to allow the ABS module enter sleep mode. Turn the ignition switch to the ON position. CLEAR the DTCs. REPEAT the self-test. If DTC C1524 is still present, verify the pedal travel sensor operation; GO to PINPOINT TEST D .
NOTE: DTC C1525 can only be cleared after carrying out the Escape Hybrid brake system service bleed procedure. C1525
 Brake System Initialization Incomplete ABS Module Turn the ignition switch to the OFF position. Turning the ignition switch to the ON position. CLEAR the DTCs. CARRY OUT the on-demand self-test. If DTC C1525 is present, CARRY OUT the service bleed procedure. REFER to BRAKE SYSTEM BLEEDING - HYBRID  in this section.
C1526 Brake Pedal Travel Sensor Fault ABS Module INSTALL a new brake master cylinder (also referred to as the actuation control unit [ACU]). REFER to HYDRAULIC BRAKE ACTUATION ; note also, if DTC C1526 and C1524 are present, a new brake master cylinder (ACU) must be installed. Then, GO to PINPOINT TEST E .
U2050 No Application Present ABS Module CARRY OUT a software reset by cycling the ignition switch OFF. DRIVE the vehicle. CLEAR the DTCs. DRIVE the vehicle. VERIFY that the red brake warning indicator is not illuminated. REPEAT the self-test. If DTC U2050 is retrieved again, INSTALL a new hydraulic control unit (HCU). REFER to VEHICLE DYNAMIC SYSTEMS . REPEAT the self-test.

For a complete list of ABS module DTCs, REFER MULTIFUNCTION ELECTRONIC MODULES .

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