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 1-Fig 2 .

For diagnosis and repair procedure with OBD II scan tool (Non Enhanced), see Fig 3.

For APP sensor circuit wiring diagram, see Fig 4. For location of emission related components, see Figure.

For ECM location, see Figure. For ECM connector terminal view, see Figure.

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

Fig 1: DTC P2120 Diagnostic Procedure Using Toyota Hand Held Tester (Steps 1-3)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: DTC P2120 Diagnostic Procedure Using Toyota Hand Held Tester (Step 4)

Fig 3: DTC P2120 Diagnostic Procedure Using OBD II Scan Tool

Fig 4: APP Sensor Circuit Wiring Diagram