Diagnosis & Repair

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

Read freeze frame data using the hand-held tester or the OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. After confirming DTC P0100, use Toyota hand-held tester or scan tool to access CURRENT DATA to confirm MAF meter air flow rate. If MAF meter air flow rate is 0.0 gm/sec., VG circuit may be open or shorted, or power source circuit may be open. If MAF meter air flow rate is 202.2 gm/sec. or more, EVG circuit may be open.

For diagnosis and repair procedure, see Fig 1-Fig 3 .

For wiring diagrams, see appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article. For MAF meter connector terminal view, see Fig 4. If access to, or replacement of ECM is necessary, ECM is located behind glove box. See Figure. For ECM connector terminal identification, see Figure. For testing of systems or components, see SYSTEM & COMPONENT TESTING - 4-CYLINDER article. For removal and installation of components, see REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article.

Fig 1: DTC P0100 Diagnostic Procedure (Step 1)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: DTC P0100 Diagnostic Procedure (Steps 2-3)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: DTC P0100 Diagnostic Procedure (Steps 4-6)

Fig 4: Identifying Mass Airflow Meter Connector Terminals