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Home >> Toyota >> 2001 >> Corolla CE, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 63 (Automatic Transmission Diagnosis - U140E & U140F) >> Diagnostic Tests >> DTC P1520: BRAKELIGHT Switch Circuit Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Toyota RAV4, 2002 Toyota Highlander, 2002 Toyota Camry, 2002 Lexus RX 300, and 2001 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Access ECM. See Figure-Figure . Turn ignition switch to ON position. Using a DVOM, measure voltage between ground and ECM STP circuit terminal. See PIN VOLTAGE TESTS .
  2. With brake pedal depressed, voltage should be 7.5-14 volts. With brake pedal released, voltage should be less than 1.5 volts. If voltage is not as specified, go to next step. If voltage is as specified, problem is intermittent. Check wiring harness and connector.
  3. Check brakelight switch. See BRAKELIGHT SWITCH  under COMPONENT TESTS. If brakelight switch is okay, check circuit between brakelight switch and ECM. If circuit is okay, replace ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE.
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