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Home >> Ford >> 2005 >> Escape Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 457 (Anti-Lock Brake System - Vehicle Dynamic Systems) >> Diagnosis And Testing >> Anti-Lock Control - Hybrid >> Pinpoint Tests >> Pinpoint Test M: DTCs C1187, C1188, C1189, C1327 and C1523 - Brake Fluid Level Sensor Circuit Fault >> PINPOINT TEST M: DTCs C1187, C1188, C1189, C1327 AND C1523 - BRAKE FLUID LEVEL SENSOR FAULT

PINPOINT TEST M: DTCs C1187, C1188, C1189, C1327 AND C1523 - BRAKE FLUID LEVEL SENSOR FAULT

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: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
NOTE: The brake fluid level switch is integral to the master cylinder reservoir which is integral to the brake master cylinder. If a new brake fluid level switch needs to be installed, a new brake master cylinder must be installed.
  1. M1 RETRIEVE THE ABS MODULE DTCs 
    • Key in OFF position.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Retrieve and record any ABS module DTCs.
    • Are DTCs C1187, C1188, C1189, C1327 and/or C1523 retrieved? 
    1. YES  : For DTC C1187  , go to  M3.

      For DTC C1188  , go to  M6.

      For DTC C1189  , go to  M3.

      For DTC C1327  , go to  M2.

      For DTC C1523  , go to  M3.

    2. NO  : Go to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
  2. M2 CHECK THE BRAKE FLUID LEVEL 
    • Verify that the brake fluid level is between the MIN and the MAX marks on the brake fluid reservoir.
    • Is the brake fluid level between the MIN and the MAX marks on the brake fluid reservoir? 
    1. YES  : Go to  M3.
    2. NO  : INSPECT the brake system for leaks, REPAIR as necessary. If no leaks are found, ADJUST the brake fluid level using the specified fluid. CLEAR the DTC. REPEAT the self test.
  3. M3 ISOLATE THE BRAKE FLUID LEVEL SWITCH 
    • Disconnect: Brake Fluid Level Switch C124
    • Measure the resistance between brake fluid level switch C124 pin-1, component side and brake fluid level switch C124 pin-2, component side.
    • Is the resistance approximately 1,200 ohms? 
    1. YES  : For DTC C1187  , go to  M4.

      For DTC C1189  , go to  M5.

      For DTC C1327  , go to  M4.

      For DTC C1523  , go to  M4.

    2. NO  : INSTALL a new brake master cylinder. REFER to HYDRAULIC BRAKE SYSTEM ACTUATION article. CLEAR the DTCs. REPEAT the self-test.
  4. M4 CHECK CIRCUITS LCA16 (GN) AND RCA16 (BU/BN) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: ABS Module C1462
    • Measure the resistance between ABS module C1462-3, circuit RCA16 (BU/BN), harness side and brake fluid level switch C124-2, circuit RCA16 (BU/BN), harness side.
      • Fig 1: Measuring Resistance
      GF0042304Courtesy of FORD MOTOR CO.
    • Measure the resistance between ABS module C1462-28, circuit LCA16 (GN), harness side and brake fluid level switch C124-1, circuit LCA16 (GN), harness side.
      • Fig 2: Measuring Resistance
      GF0042305Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  M7.
    2. NO  : REPAIR the affected circuit(s). CLEAR the DTC. REPEAT the self-test.
  5. M5 CHECK CIRCUIT LCA16 (GN) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between brake fluid level switch C124-1, circuit LCA16 (GN), harness side and ground.
      • Fig 3: Measuring Resistance
      GF0042306Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  M7.
    2. NO  : REPAIR circuit LCA16 (GN). CLEAR the DTC. REPEAT the self-test.
  6. M6 CHECK CIRCUITS LCA16 (GN) AND RCA16 (BU/BN) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: Brake Fluid Level Switch C124
    • Disconnect: ABS Module C1462
    • Key in ON position.
    • Measure the voltage between brake fluid level switch C124-2, circuit RCA16 (BU/BN), harness side and ground.
      • Fig 4: Measuring Voltage
      GF0042307Courtesy of FORD MOTOR CO.
    • Measure the voltage between brake fluid level switch C124-1, circuit LCA16 (GN), harness side and ground.
      • Fig 5: Measuring Voltage
      GF0042308Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. YES  : REPAIR the affected circuit(s). CLEAR the DTC. REPEAT the self-test.
    2. NO  : Go to  M7.
  7. M7 CHECK FOR ABS MODULE OPERATION 
    • Disconnect: ABS Module C1462
    • Check the connector for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect: ABS Module C1462
    • Connect: Brake Fluid Level Switch C124
    • Key in ON position.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new hydraulic control unit (HCU). REFER to HYDRAULIC CONTROL UNIT (HCU) . CLEAR the DTCs. REPEAT the self-test.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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