Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Toyota MR2. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Using Toyota hand-held tester or scan tool, read FREEZE FRAME data. Freeze frame data records engine conditions when malfunction is detected.

For diagnosis and repair procedure with Toyota Hand-held tester or an Enhanced OBD II scan tool, see Fig 2-Fig 3 .

For diagnosis and repair procedure with OBD II scan tool (Non Enhanced), see Fig 4.

For circuit wiring diagram, see Fig 1.

For testing of systems or components, see SYSTEM & COMPONENT TESTING - 4-CYLINDER article. For removal and installation of components, see REMOVAL & INSTALLATION - 4-CYLINDER article.

Fig 1: Throttle/Pedal Position Sensor/Switch Circuit

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: DTC P0120 Diagnostic Procedure Using Hand Held Tester (Steps 1-2)

Fig 3: DTC P0120 Diagnostic Procedure Using Hand Held Tester (Steps 3-4)

Fig 4: DTC P0120 Diagnostic Procedure Using OBD II Scan Tool