Fuel Pump Control Circuit: Avalon

For fuel pump control circuit inspection and wiring diagram, see Fig 1-Fig 7 . To check starter signal circuit, see STARTER SIGNAL CIRCUIT . To check ECM power source circuit, see ENGINE CONTROL MODULE POWER SOURCE CIRCUIT . To check circuit opening relay, see CIRCUIT OPENING RELAY under MODULES, MOTORS, RELAYS & SOLENOIDS. For circuit identification, see ENGINE PERFORMANCE in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. To check fuel pump operation, see FUEL DELIVERY under FUEL SYSTEMS. Before replacing ECM, check ECM connectors and ground circuits. See ENGINE CONTROL MODULE POWER & GROUND CIRCUITS under COMPUTERIZED ENGINE CONTROLS.

Fig 1: Fuel Pump Control Circuit Description & Diagram (Avalon)

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Fig 2: Fuel Pump Control Circuit Inspection Using Hand-Held Tester - Step 1 (Avalon)

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Fig 3: Fuel Pump Control Circuit Inspection Using Hand-Held Tester - Steps 2-5 (Avalon)

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Fig 4: Fuel Pump Control Circuit Inspection Using Hand-Held Tester - Step 6; Using OBD II Scan Tool - Step 1 (Avalon)

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Fig 5: Fuel Pump Control Circuit Inspection Using OBD II Scan Tool - Steps 2-4 (Avalon)

Fig 6: Fuel Pump Control Circuit Inspection Using OBD II Scan Tool - Steps 5-6 (Avalon)

Fig 7: Fuel Pump Control Wiring Diagram (Avalon)