DTC P0100, DTC P0102 &/Or DTC P0103: Notes
WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
Code Definition
- DTC P0100: Mass Airflow Meter Circuit
- DTC P0102: Mass Airflow Meter Circuit Low Input
- DTC P0103: Mass Airflow Meter Circuit High Input
CAUTION:
If Engine Control Module (ECM) replacement is instructed in following test, always ensure ECM electrical connectors and ground circuits are okay. If either are defective, repair and repeat testing to confirm ECM malfunction. On models equipped with engine immobilizer, if ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. For programming procedures, see COMPUTER RELEARN PROCEDURES - TOYOTA
article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.
NOTE:
If DTCs related to IAT, HO2S, ECT and/or VPS are output simultaneously, the E2 sensor ground circuit at ECM 34-pin connector E4 terminal No. 2 (Brown wire) may be open. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article. For ECM electrical connector terminal identification, see Figure. It may be necessary to check intermediate connectors and ground point in circuit as well. Splice No. 18 is located behind passenger's side of instrument panel, above ECM. Intermediate connector "IE1" is located behind left kick panel. Ground connection "EF" is located on right side of left cylinder head.