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Home >> GMC >> 1998 >> Yukon RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Automatic Transmission Diagnosis - 4L80-E (Gasoline)) >> Diagnostic Tests >> DTC P0719: Brake Switch Circuit Low Input >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 1998 GMC Savana Special, 1998 GMC Savana Camper Special, 1998 GMC Savana, 1998 Chevrolet RV Cutaway, and 1998 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect scan tool to DLC. Turn ignition switch to ON position. DO NOT start engine. Using scan tool, record freeze frame and failure records for reference. Data will be lost when DTCs are cleared later in this test.
  2. Select "TCC Brake Switch" on scan tool. Disconnect TCC brake switch connector. Connect test light between ground and ignition feed circuit at brake switch connector. See WIRING DIAGRAMS . If test light is on, go to next step. If test light is off, go to step 4).
  3. Install a fused jumper between TCC brake switch connector terminals. If TCC brake switch status on scan tool changes from open to closed, replace brake switch, then go to step 5). If TCC brake switch status on scan tool does not change from open to closed, check for open in TCC brake switch input circuit. Repair as necessary, then go to step 5). If circuit is okay, replace VCM, then go to step 5).
  4. Check appropriate fuse for open. If fuse is okay, check for open in ignition feed circuit. Repair as necessary, then go to next step. If fuse is open, check for short to ground in ignition feed circuit. Repair as necessary, then go to next step. If circuit is okay, check for short to ground in brake switch input circuit. Repair as necessary, then go to next step. If circuit is okay, replace VCM, then go to next step.
  5. After repair is complete, select DTC on scan tool. Select "Clear Info" function. Select "Specific DTC" and enter DTC "P0719". Turn ignition on. Ensure TCC brake switch status on scan tool indicates closed (12 volts) for 3 seconds with brake pedal released. If DTC P0719 is not present, repair is complete. If DTC P0719 is still present, repeat test.
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