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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1502 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC P1575 >> Diagnostic Aids

Diagnostic Aids

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

An improperly adjusted extended travel brake switch may cause this DTC to set. In order to avoid misdiagnosis, verify that the extended travel brake switch is properly adjusted. Refer to Stop Lamp Switch Adjustment in Lighting Systems.

DTC P1575

Step Action Value (s) Yes No
Schematic Reference:  Cruise Control Schematics  
1 Did you perform the Cruise Control Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - Cruise Control 
2
  1. Turn the ignition OFF.
  2. Install a scan tool.
  3. Turn the ignition ON, the engine OFF.
  4. With the scan tool, observe the Extended Brake Travel Switch parameter in the PCM Engine 1 Data list.
Does the Extended Brake Travel Switch parameter display Released?		 - Go to Step 3  Go to Step 6 
3
  1. Depress the brake pedal approximately half way down.
  2. With the scan tool, observe the Extended Brake Travel Switch parameter.
Does the Extended Brake Travel Switch parameter display Applied?		 - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 4 
4
  1. Turn the ignition OFF.
  2. Disconnect the extended travel brake switch.
  3. Turn the ignition ON, with the engine OFF.
  4. With the scan tool, observe the Extended Brake Travel Switch parameter.
Does the Extended Brake Travel Switch parameter display Applied?		 - Go to Step 11  Go to Step 5 
5
  1. Turn the ignition ON, with the engine OFF.
  2. With a DMM, measure the voltage on the extended brake travel switch signal circuit.
Does the voltage measure more than the specified value?		 0.5 V Go to Step 8  Go to Step 13 
6
  1. Turn the ignition OFF.
  2. Disconnect the extended travel brake switch.
  3. Turn the ignition ON, with the engine OFF.
  4. Connect a test lamp between the ignition 1 voltage circuit and a good ground
Does the test lamp illuminate?		 - Go to Step 7  Go to Step 9 
7
  1. Turn the ignition OFF.
  2. Connect a 3 ampere fused jumper between the extended travel brake switch signal circuit and the ignition 1 voltage circuit.
  3. Turn the ignition ON, with the engine OFF.
  4. With the scan tool, observe the Extended Brake Travel Switch parameter.
Does the Extended Brake Travel Switch parameter display Released?		 - Go to Step 11  Go to Step 10 
8 Repair the short to voltage on the extended travel brake switch signal circuit. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 15  -
9 Repair the open, the short to ground, or the high resistance on the ignition 1 voltage circuit. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 15  -
10 Test the extended travel brake switch signal circuit for an open or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 15  Go to Step 13 
11 Inspect for poor connections at the extended travel brake switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
12 Replace the Extended Travel Brake switch. Refer to Stop Lamp Switch Replacement in Lighting Systems.
Did you complete the replacement?		 - Go to Step 15  -
13 Inspect for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 14 
14
IMPORTANT: Program the replacement PCM.
Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls - 5.7L.Did you complete the replacement?		 - Go to Step 15  -
15
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.
Does the DTC set?		 - Go to Step 2  -
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