Fuel Delivery

Vehicles are equipped with different combinations of fuel system electrical components. For complete wiring circuit of electrical components on a specific model, see WIRING DIAGRAMS article.

A/F Heater Relay (Avalon, Camry 3.0L V6 With A/T, Camry Solara 3.0L V6 With A/T, Highlander & Sienna)

A/F heater relay may also be referred to as A/F HTR relay, A/F sensor relay or A/F relay. Constant battery voltage is supplied from battery, through A/F heater fuse to one side of A/F heater relay. A/F heater fuse may also be referred to as A/F fuse. A/F heater relay is energized by MREL terminal of Engine Control Module (ECM). When A/F heater relay is energized, A/F heater relay provides battery voltage to +B terminal at A/F sensors. For A/F heater relay location, see A/F HEATER RELAY LOCATION table.

2001 ENGINE PERFORMANCE Theory & Operation

2001 Rav4 Igniter
Fig. 50: Locating A/F Heater Relay (Sienna) Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

A/F Heater Relay (RAV4)

A/F heater relay may also be referred to as A/F HTR relay, A/F sensor relay or A/F relay. Constant battery voltage is supplied from battery, through A/F heater fuse to one side of A/F heater relay. A/F heater fuse may also be referred to as A/F fuse. When EFI main relay is energized, voltage is supplied to both sides of A/F heater relay and A/F heater relay is energized. When A/F heater relay is energized, A/F heater relay provides battery voltage to +B terminal at A/F sensors. For A/F heater relay location, see A/F HEATER RELAY LOCATION table.

DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

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  • Marko
    Where can I locate fuel pump relay in Toyota Highlander?
    2 years ago

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