Diagnosis & Repair

NOTE: After confirming DTC P1780, use Toyota hand-held tester to access CURRENT DATA to confirm PNP switch signal. Using 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.

For diagnosis and repair procedure with OBD II scan tool (Non Enhanced), see Fig 2.

For circuit wiring diagram, see Fig 3.

When access to, or replacement of ECM is necessary, Engine Control Module (ECM) is located behind glove box. See Figure. For ECM connector terminal view, see Figure.

For vacuum or EVAP hose routing, see VACUUM DIAGRAMS article. 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, OVERHAUL & INSTALLATION - 4-CYLINDER article.

Fig 1: DTC P1780 Diagnostic Procedure Using Hand-Held Tester

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: DTC P1780 Diagnostic Procedure Using OBD II Scan Tool

Fig 3: PNP Switch Circuit Wiring Diagram