4Runner 4.0L

For fuel pump control circuit description and inspection, see Figure and Figure-Figure . For fuel pump control circuit wiring diagram, see Figure. To check ECM power source circuit, see ENGINE CONTROL MODULE POWER SOURCE CIRCUIT . For circuit identification, see ENGINE PERFORMANCE in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Before replacing ECM, check ECM connectors and ground circuits. See ENGINE CONTROL MODULE POWER & GROUND CIRCUITS  under COMPUTERIZED ENGINE CONTROLS.