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HOMESERVICE MANUALSCADILLAC2011ESCALADE BASE, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 920 (AUTOMATIC TRANSMISSION - ALLISON - REMOVAL & INSTALLATION, SERVICE, OVERHAUL, TROUBLESHOOTING & DIAGNOSIS)DIAGNOSTIC INFORMATION AND PROCEDURESROAD TESTELECTRICAL FUNCTION CHECK
2011 Cadillac Escalade Base, AWD

Electrical Function Check

2011 Cadillac Escalade Base, AWDSECTION Electrical Function Check
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Perform this check first, in order to ensure the electronic transmission components are connected and functioning properly. If these components are not checked, a simple electrical condition could be mis-diagnosed.

  1. Install the scan tool.
  2. Ensure the shift selector is in PARK and set the parking brake.
  3. Start the engine.
  4. Verify that the following scan tool data can be obtained and is functioning properly. Refer to Scan Tool Data List for typical data values. Data that is questionable may indicate a concern.
    • Engine speed
    • Transmission input speed
    • Transmission turbine speed
    • Transmission output speed
    • Vehicle speed
    • TFP 1, 2, 3 and TFP 4 pressure switch states
    • C, D, E and REVERSE pressure switch states
    • Transmission range, engine list
    • 4WD low
    • Commanded range, current range
    • PCS1 and PCS2 solenoid reference current
    • PCS1 and PCS2 solenoid actual current
    • PCS1 and PCS2 solenoid duty cycle
    • Brake switch
    • Engine coolant temperature
    • Transmission fluid temperature
    • Throttle angle
    • Ignition voltage
    • Shift solenoid 1
    • Shift solenoid 2
    • Shift solenoid 3
    • Modulated main G solenoid
    • TCC solenoid duty cycle
    • TCC slip speed
  5. Monitor the brake switch signal while depressing and releasing the brake pedal. The scan tool should display the following:
    • Closed when the brake pedal is released
    • Open when the brake pedal is depressed
  6. Check the garage shifts.
    1. Apply the brake pedal and ensure the parking brake is set.
    2. Move the shift selector through the following ranges:
      1. PARK to REVERSE
      2. REVERSE to NEUTRAL
      3. NEUTRAL to DRIVE
    3. Pause 2 to 3 seconds in each selector position.
      4. IMPORTANT: Harsh engagement may be caused by any of the following conditions:
      • High idle speed

        Compare engine idle speed to desired idle speed.

      • Commanded low PCS1 or PCS2 solenoid current

        Compare PCS1 and PCS2 solenoid reference current to PCS1 and PCS2 solenoid actual current.

      • A default condition caused by certain DTCs that result in maximum full throttle shift points
      • Shift is not fully adapted
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.