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Test Description

WARNING: This page is about a different car, the 2007 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: Antilock Brake System Schematics 
Connector End View Reference: Antilock Brake System Connector End Views , Engine Control Module Connector End Views for the 3.6L engine, or Engine Control Module Connector End Views for the 6.0L engine
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 Test the extended brake travel circuit of the electronic brake control module (EBCM) for the following conditions:
  • An open
  • A short to ground
  • A short to battery

Refer to Circuit Testing and Wiring Repairs .
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 .
  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 brake pedal position sensor (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 .
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 engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 9  Go to Step 8 
7 Replace the EBCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the repair?		 - Go to Step 9  -
8  Replace the ECM. Refer to Control Module References for replacement, setup, and programming.
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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