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Pinpoint Test G: DTC C1446: Testing

WARNING: This page is about a different car, the 2009 Ford RV Cutaway, 2009 Ford Econoline, 2009 Ford E450 Super Duty, and 2009 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. G1 CHECK THE RED BRAKE WARNING INDICATOR OPERATION 
    • Monitor the red brake warning indicator in the IPC  .
    • Ignition OFF.
    • Ignition ON.
    • Verify the red brake warning indicator illuminates for a few seconds and then extinguishes.
    • Does the warning indicator illuminate for a few seconds and then extinguish? 
    1. Yes:  Go to G2  .
    2. No:  REFER to INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES to diagnose the red brake warning indicator.
  2. G2 CHECK THE STOPLAMP OPERATION 
    • Verify the stoplamps operate correctly while pressing and releasing the brake pedal.
    • Do the stoplamps operate correctly? 
    1. Yes:  Go to G3  .
    2. No:  REFER to EXTERIOR LIGHTING to diagnose the stoplamps.
  3. G3 CHECK THE ABS MODULE DTCs 
    • Review the ABS module DTCs retrieved during Inspection and Verification.
    • Are any communication (U-code) DTCs present? 
    1. Yes:  Go to the ABS MODULE DTC CHART  and diagnose the U-code DTCs.
    2. No:  Go to G4  .
  4. G4 CHECK THE PCM FOR DTCs 
    • Connect the scan tool.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self Test - PCM.
    • Retrieve and record the PCM DTCs.
    • Are any DTCs present in the PCM? 
    1. Yes:  REFER to the INTRODUCTION - GASOLINE MODELS to diagnose the PCM.
    2. No:  Go to G5  .
  5. G5 MONITOR THE ABS MODULE BRAKE ON/OFF (BOO_ABS) PID 
    • Enter the following diagnostic mode on the scan tool: DataLogger - ABS Module.
    • Press and release the brake pedal while monitoring the BOO_ABS PID.
    • Does the PID display ON with the brake pedal applied and OFF with the brake pedal released? 
    1. Yes:  The system is operating correctly at this time. CLEAR the DTCs. REPEAT the self-test.
    2. No:  Go to G6  .
  6. G6 MONITOR THE PCM BOO PID 
    • Enter the following diagnostic mode on the scan tool: DataLogger - PCM.
    • Press and release the brake pedal while monitoring the BOO PID.
    • Does the PID display ON with the brake pedal applied and OFF with the brake pedal released? 
    1. Yes:  REFER to MODULE COMMUNICATIONS NETWORK to diagnose the HS-CAN  bus.
    2. No:  REFER to EXTERIOR LIGHTING to diagnose the stoplamp switch.
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