Engine Control Module (ECM) Power Source Circuit: Notes

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2000 Toyota Tacoma, 2000 Toyota RAV4, 2000 Toyota ECHO, 2000 Toyota Corolla, and 2000 Toyota Celica. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: If Engine Control Module (ECM) replacement is instructed in the following testing, always ensure ECM wiring harness electrical connector and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction.

NOTE: When performing test for ECM power source circuit, it may be necessary to check wiring harness and components connected to a specified fuse, or check wiring harness and electrical connectors between EFI main relay and battery. For additional wiring information for fuse and power supply circuit, see POWER DISTRIBUTION article in WIRING DIAGRAMS.