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Pinpoint Test D: TCS (Transmission Control Switch)/Grade Assist

WARNING: This page is about a different variant/trim than selected.
  1. D1 RETRIEVE AND RECORD ALL DTCS 
    • Using the diagnostic scan tool, retrieve all Diagnostic Trouble Codes (DTCs).

    Is DTC P1780 present? 

  2. D2 CHECK THE BJB FUSE 
    • Ignition OFF.
    • Remove the BJB  fuse 38 (15A).
    • CHECK Fuse 38 (15A).

    Is the resistance less than 3 ohms? 

    • Yes  : GO to  D6
    • No  : GO to D3 
  3. D3 CHECK FOR PCM DTCS 
    • Using the diagnostic scan tool, retrieve PCM  Diagnostic Trouble Codes (DTCs).

    Is DTC P0562 or U0100 present? 

  4. D4 CHECK THE TCS POWER CIRCUIT FOR A SHORT TO GROUND 
    • Disconnect Floor Shifter C3245  .
    • Measure the resistance  between.
      Positive Lead Measurement/Action Negative Lead
      C3245-6  OHM Ground

    Is the resistance greater than 10, 000 ohms? 

    • Yes  : GO to D5 
    • No  : REPAIR the circuit.
  5. D5 CHECK THE TCS INPUT CIRCUIT FOR A SHORT TO GROUND 
    • Disconnect TCM C1750A  .
    • Measure the resistance  between.
      Positive Lead Measurement/Action Negative Lead
      C3245-5  OHM Ground

    Is the resistance greater than 10, 000 ohms? 

    • Yes  : GO to  D8
    • No  : REPAIR the circuit.
  6. D6 CHECK THE TCS POWER CIRCUIT FOR AN OPEN 
    • Disconnect Floor Shifter C3245  .
    • Measure the resistance  between.
      Positive Lead Measurement/Action Negative Lead
      C3245-6  OHM BJB  fuse 38 (15A)

    Is the resistance less than 3 ohms? 

    • Yes  : GO to D7 
    • No  : REPAIR the circuit.
  7. D7 CHECK THE TCS INPUT CIRCUIT FOR AN OPEN 
    • Disconnect TCM C1750A  .
    • Measure the resistance  between.
      Positive Lead Measurement/Action Negative Lead
      C3245-5  OHM C1750A-11 

    Is the resistance less than 3 ohms? 

    • Yes  : GO to D8 
    • No  : REPAIR the circuit.
  8. D8 CHECK THE TCS SWITCH 
    • Measure the component side resistance  while cycling the TCS  between.
      Positive Lead Measurement/Action Negative Lead
      C3245-5  OHM C3245-6 

    Is the resistance less than 1.5 ohms with the switch pressed and greater than 10, 000 ohms when released? 

  9. D9 CHECK THE TCM 
    • Install fuse 38 (15A).
    • Connect Floor Shifter C3245  .
    • Ignition ON.
    • Measure the voltage  between.
      Positive Lead Measurement/Action Negative Lead
      C1750A-11  VOLTAGE Ground

    Is the voltage greater than 10 volts with the switch pressed and less than 5 volts when released? 

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