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Pinpoint Test G: DTC C1288 - Pressure Transducer Main/Primary Input Circuit Failure

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
  1. G1 CHECK FOR ACTIVE DTCs 
    • Connect the diagnostic tool.
    • Key in ON position.
    • Using the scan tool, clear the ABS module DTCs.
    • Using the scan tool, carry out the ABS module self-test. Retrieve and record any DTCs.
    • Does DTC C1288 return? 
    1. YES  : Go to  G2.
    2. NO  : The system is operating correctly at this time. TEST DRIVE the vehicle above 32 km/h (20 mph) and CARRY OUT at least one ABS stop. RETRIEVE and RECORD any DTCs.
  2. G2 CHECK THE MASTER CYLINDER AND PEDAL FOR CORRECT OPERATION 
    • Press and release the brake pedal.
    • Does the brake pedal smoothly travel to the stop and then return automatically when released? 
    1. YES  : Go to  G3.
    2. NO  : INSPECT the brake pedal and master cylinder for obstructions and foreign material that may cause a binding condition. REPAIR or INSTALL new as necessary. CLEAR the DTCs. REPEAT the self-test.
  3. G3 CHECK FOR AIR IN THE BRAKE HYDRAULIC SYSTEM 
    • Select PARK.
    • Start the engine.
    • Press and release the brake pedal several times.
    • Does the brake pedal move smoothly and evenly through the length of it's travel? 
    1. YES  : Go to  G4.
    2. NO  : REFER to BRAKE SYSTEM - GENERAL INFORMATION to continue diagnosis of the brake hydraulic system.
  4. G4 CHECK FOR FLUID LEAKS IN THE BRAKE HYDRAULIC SYSTEM 
    • Visually inspect the brake hydraulic system for brake fluid leaks.
    • Are any leaks found? 
    1. YES  : REPAIR them as necessary. BLEED the brake system, REFER to BRAKE SYSTEM - GENERAL INFORMATION . CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  G5.
  5. G5 MONITOR THE POWERTRAIN CONTROL MODULE (PCM) BRAKE ON/OFF (BOO) PID 
    • Using the scan tool, monitor the PCM BOO PID while pressing and releasing the brake pedal.
    • Does the PID agree with the brake pedal position? 
    1. YES  : Go to  G6.
    2. NO  : REFER to EXTERIOR LIGHTING to continue diagnosis of the BOO switch.
  6. G6 MONITOR THE ABS MODULE MASTER CYLINDER PRESSURE PID 
    • Firmly press and release the brake pedal while monitoring the ABS module MC_PRESS PID.
    • Does the PID increase with increased brake pedal pressure and decrease with decreased brake pedal pressure? 
    1. YES  : The system is operating correctly at this time. TEST DRIVE the vehicle above 32 km/h (20 mph) and CARRY OUT at least one ABS stop. RETRIEVE and RECORD any DTCs.
    2. NO  : INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) . CALIBRATE the ABS module. FOLLOW the scan tool directions for the calibration procedure. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.
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