Description

Toyota Rav 4 Electrical Schematic – 18-Page Factory Wiring Diagram

If you are tracing a no-start or chasing a short in a Toyota Rav 4, the first thing you need is the factory Electrical Schematic. I have seen techs spend three hours guessing which wire feeds the fuel pump relay, then smoke a module because they misread a aftermarket drawing. This 18-page PDF is the original Toyota engineering document for the 2GR-FE engine control system. Page 2 shows you the EFI MAIN relay circuit, the IG2 feed, and exactly where the 20A fuse sits. Page 3 lays out the fuel pump resistor and the Engine Control Module pinouts at connectors A9 and B30. If you do not have this schematic on your tablet or pinned to your board, you are working blind.

Engine Control System (2GR-FE) Wiring

Pages 2 through 5 cover the entire engine control harness for the 2GR-FE. The ECU gets +B and +B2 from the EFI MAIN relay, and a separate 10A ETCS fuse powers the +BM circuit. The VVT sensors for bank 1 and bank 2—intake and exhaust—each have dedicated signal lines (VV1+, VV1–, VV2+, VV2–) that go straight to pins B45, B85, B44, B84. Miss one ground path and the variable valve timing throws a code that is a nightmare to diagnose without the pin references in this book.

Fuel Pump and Injector Circuits – What You Need

The fuel pump relay sits between the SK1 connector and the pump itself. Page 3 shows the circuit: +B and +B2 from the ECU energize the relay coil when the engine cranks. The fuel pump resistor (mounted near the tank) drops voltage at idle. If you are chasing a lean condition or a pump that runs constantly, check the FPR wire at the ECU pin FC. The injector wiring on page 4 lists each injector (No. 1 through No. 6) with its respective ECU pin—B59 for No. 6, B45 for No. 4, and so on. That level of detail is why OEM schematics are the only thing I trust. Aftermarket prints lump injectors together and you end up firing the wrong cylinder.

VVT Sensor Wiring: Bank 1 and Bank 2

Pages 4 and 5 map the VVT sensors with exact color codes. Bank 1 intake side ties to pin B52, exhaust to B51. Bank 2 intake at B36, exhaust at B35. The manual shows three-wire sensors: VC (5V reference), VV+, VV– (signal and ground). If your Rav 4 sets a P0012 or P0022, pull out this schematic and check continuity from the sensor connector back to the ECU. Nine times out of ten a rubbed-through wire at the cam cover causes it. You will find that ground path on page 5 under the Camshaft Timing Oil Control Valve section.

Throttle Body and VSV Circuit – 3 Systems on One Page

Page 5 crams the throttle body assembly, the purge VSV, and the ACIS VSV into a single clean diagram. The throttle body has its own motor wires (M+, M–) and two position sensor signals (VTA1, VTA2) plus a 5V reference (VC). The VSV for air intake control uses pins ST1– and AICV. The purge VSV runs from the PRG line. I have used this page to solve a idle surge on a 2009 Rav 4: the ACIS VSV was stuck open because the ground at pin E2 had corrosion. Without the factory schematic, you would never know E2 is the common ground for all three VSVs.

Audience Fit – Who This Schematic Serves

Home garage guys who have swapped alternators and brakes but freeze when they see a wiring diagram—this is your cheat sheet. Professional mechanics who bill by the hour and cannot afford to misread a generic print—keep this in your laptop. And shop owners who want their techs to stop replacing parts they do not need—buy the factory schematic and make them prove power and ground before ordering anything. If you own a Rav 4 with the 2GR-FE and you are any of the above, you need this document on your bench.

Source Validity – OEM vs Aftermarket

This is a direct scan from Toyota’s own engineering publication. The OCR excerpt on our site shows the exact wire labels and connector numbers used at the factory. Aftermarket wiring books often consolidate grounds or skip the secondary air injection circuits—this one does not. Every pin, every splice, every fuse rating is original. I have been turning wrenches for 28 years, and I will tell you straight: if the manual says “EFI MAIN 20A BAT”, that fuse is a 20-amp battery feed, not a 15 or 30 that some aftermarket hack guessed.

Does this cover only the 2GR-FE engine?

Yes. The 18 pages focus exclusively on the 2GR-FE engine control system. Other Rav 4 systems (body, ABS, HVAC) are not included.

What page has the ECU pinout?

Page 3 shows the main ECU connectors A9 and B30 with pin numbers. Page 4 continues with additional pin assignments for injectors and VVT sensors.

Can I use this for other Toyota models?

Only if they share the 2GR-FE engine and identical harness layout. Cross-reference your vehicle’s engine code. Do not assume – Toyota changes pinouts between model years and platforms.

Why is it only 18 pages instead of a full service manual?

This is a focused electrical schematic, not a repair manual. It gives you the wiring diagrams you need for diagnostics without the weight of 2000 pages. For a specific electrical problem, 18 pages of factory wiring is more useful than a 300-page generic guide that buries the critical connections in the back.

Other Toyota wiring resources you can use alongside this schematic: Toyota Avanza 2000 Electrical Schematic – OEM Wiring Diagram 39 Pages, Toyota Mazda GM Electrical Schematic – OEM Wiring Diagrams 229 Pages, and 1991 Toyota MR2 Electrical Wiring Diagram. For a broader perspective on diagnostic standards, see Automotive Industry Overview. And when you are testing battery voltage and charging circuits, refer to Automotive Battery for fundamentals. Access the Factory Manual and start your repair with the right information.