LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 1998 >> Avalon XLS >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission Diagnosis - A-541E >> Diagnostic Tests >> DTC P1520: BRAKELIGHT Switch Signal >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Inspect operation of brakelights. Repair as needed. If switch is suspect, see BRAKELIGHT SWITCH  under COMPONENT TESTS. If circuit is suspect, diagnose and repair as necessary. See WIRING DIAGRAMS .
  2. Connect scan tool to DLC3. See Figure. Turn ignition on. Read STP signal while depressing and releasing brake pedal. Ensure signal cycles when pressing brake pedal. If signal cycles, replace ECT ECU. If signal does not cycle, check and repair circuit between brakelight switch and ECT ECU. If circuit is okay, replace ECT ECU.
scientia non olet · About LEMON Manuals