| 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 MAF meter, IAT sensor, ECT sensor, TP sensor, VP sensor and APP sensor are output together, inspect ECM E2 circuit (sensor ground) between terminal No. 18 (Brown wire) at ECM harness connector E4 and splice B12. Repair as necessary. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
Circuit Description & Possible Causes
For circuit description, DTC detection conditions and possible causes (Scheme 222)
