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Home >> Cadillac >> 2003 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 633 (Antilock Brake System, Traction Control System & Stability Control System) >> Diagnostic Information and Procedures >> DTC P1575: Extended Travel Brake Switch Circuit >> Test Description
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Test Description

WARNING: This page is about a different car, the 2004 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 3:  Measure the extended brake travel circuit in order to determine if the extended brake travel signal has a valid voltage.
  2. 4:  Measure the extended brake travel signal in order to determine if the EBCM is functioning properly.
  3. 8:  This vehicle is equipped with a ECM which uses an electrically erasable programmable read only memory (EEPROM). When replacing the ECM, the replacement ECM must be programmed.
DTC P1575

Step Action Values Yes No
Schematic Reference:  ABS Schematics  
Connector End View Reference:  ABS Connector End Views  ,  Engine Control Module (ECM) Connector End Views  in Engine Controls - 2.6L and 3.2L,  Engine Control Module (ECM) Connector End Views  in Engine Controls - 3.6L, or  Powertrain Control Module (PCM) Connector End Views  in Engine Controls - 5.7L 
1 Did you perform the Diagnostic System Check - ABS? - Go to Step 2  Go to Diagnostic System Check - ABS 
2 Test the extended brake travel circuit of the EBCM for the following conditions:
  • An open
  • A short to ground
  • A short to battery

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 9  Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the EBCM harness connector.
  3. Install the J 39700  Universal Pinout Box using the J 39700-300  Cable Adapter to the EBCM harness connector and the EBCM connector. See Special Tools and Equipment .
  4. Turn ON the ignition, with the engine OFF.
  5. With the brake pedal released, measure the voltage between the extended brake travel circuit and a good ground.
Is the voltage greater than the specified value?		 2 V Go to Step 5  Go to Step 4 
4 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With the scan tool, observe the BPP Sensor Displacement parameter in the BPP System Data data list while applying pressure to the brake pedal.
  4. With the BPP Sensor Displacement parameter reading 50 percent, measure the voltage between the extended brake travel circuit and a good ground.
Is the voltage of the extended brake travel signal greater than the specified value?		 0.8 V Go to Step 6  Go to Step 5 
5 Inspect for poor connections the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 9  Go to Step 7 
6 Inspect for poor connections the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 9  Go to Step 8 
7
IMPORTANT: Perform the setup procedure for the EBCM. An unprogrammed EBCM will result in the following conditions:
  • Inoperative or poorly functioning system operations
  • The EBCM sets DTC C0281 and DTC C0550
Replace the EBCM. Refer to Electronic Brake Control Module Replacement (CTS)  or Electronic Brake Control Module Replacement (CTS-V) .Did you complete the repair?		 - Go to Step 9  -
8 
IMPORTANT: The replacement ECM must be programmed.
Replace the ECM. Refer to Engine Control Module (ECM) Replacement in Engine Controls - 2.6L and 3.2L, Engine Control Module (ECM) Replacement in Engine Controls - 3.6L, orPowertrain Control Module (PCM) Replacement in Engine Controls - 5.7L.Did you complete the repair?		 - Go to Step 9  -
9
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 - Go to Step 2  System OK
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