1989 Toyota 4Runner Fuel Pump Relay Location: The Complete Guide to Finding and Fixing It

If your 1989 Toyota 4Runner with the 22R-E engine cranks but won't start, and you don't hear the fuel pump humming when you turn the key, the most likely culprit is the fuel pump relay. On the 1989 4Runner, this relay is officially called the Circuit Opening Relay (COR), and it is located behind the passenger side kick panel, above the ECU (Engine Control Unit). You need to remove the passenger side interior trim panel to access it. The relay controls all power to the fuel pump, and when it fails, the pump gets no power at all. Before you drop the gas tank or replace the pump, check this relay first. It is a common failure point on these trucks, and replacing it is much easier and cheaper than replacing the fuel pump itself.

Understanding the Fuel Pump Relay on Your 1989 4Runner

Toyota calls the fuel pump relay the Circuit Opening Relay (COR) . It is not a standard single-coil relay. It has two separate coils inside that work together to keep your fuel pump running.

How the Circuit Opening Relay works:

  1. When you turn the key to the START position, power flows through the first coil inside the relay. This closes the circuit and sends power to the fuel pump.
  2. As soon as the engine starts and begins sucking air, the Air Flow Meter (AFM) sends a signal to the second coil in the relay. This keeps the circuit closed and the fuel pump running even after you release the key from START.
  3. If the engine stalls, the AFM stops sending that signal, the relay opens, and the fuel pump shuts off. This is a safety feature .

This design is why you might hear the pump run briefly when you first turn the key on some vehicles, but on the 1989 4Runner, the pump only runs when the engine is actually cranking or running. If you don't hear it, the relay is a primary suspect.

Exact Location of the 1989 Toyota 4Runner Fuel Pump Relay

The Circuit Opening Relay is located inside the passenger compartment. You do not need to go under the hood or under the truck to find it.

Step-by-step instructions to find the relay:

  1. Open the passenger side front door.
  2. Remove the lower kick panel on the passenger side. This is the plastic trim panel that covers the side wall of the footwell. You may need to remove a few screws or clips.
  3. Look behind the carpet and trim. You will see the ECU (Engine Control Unit) mounted vertically. The Circuit Opening Relay is located directly above the ECU .
  4. The relay is a small, black box, about 1.5 inches square. It will have a wiring harness plugged into it.

Some owners have reported that the relay is also accessible from behind the passenger side speaker grille, but the kick panel method is the most direct route .

How to Diagnose a Bad Fuel Pump Relay

Before you buy a new relay, you can test the system to confirm the relay is the problem. There is a simple test you can do under the hood.

The Diagnostic Connector Test:

  1. Open the hood and locate the Diagnostic Connector (DLC1). On the 1989 4Runner, it is a small black box usually located on the passenger side fender well .
  2. Open the lid. Inside, you will see a diagram of the terminals. You are looking for two terminals labeled B+ (or just +B) and Fp (or FP).
  3. Take a short piece of wire, a paperclip, or a safety pin. Insert one end into the B+ terminal and the other end into the Fp terminal. This creates a jumper .
  4. Turn the ignition key to the ON position (do not start the engine).
  5. Listen near the rear of the vehicle. If you hear the fuel pump humming inside the gas tank, the pump itself is good. The problem is likely the Circuit Opening Relay or the wiring that controls it .
  6. If you do not hear the pump, the problem could be the pump itself, a blown fuse, or a wiring issue between the relay and the pump.

What the test results mean:

  • Pump runs with jumper: The fuel pump, its wiring, and the EFI fuse are good. The failure is in the relay or the AFM circuit.
  • Pump does not run with jumper: The problem is downstream of the diagnostic connector. Check the EFI fuse (15A or 20A), the wiring to the pump, and the pump itself .

Other Common Causes of No Power to the Fuel Pump

If the jumper test shows the pump is getting power but the relay test fails, there are a few other things to check.

1. The EFI Main Relay
The fuel system uses two relays: the Circuit Opening Relay and the EFI Main Relay. The EFI relay is located in the engine compartment fuse box. It supplies power to the entire fuel injection system, including the Circuit Opening Relay. If the EFI relay is bad, the Circuit Opening Relay will not get power, and the fuel pump will not run .

2. The Air Flow Meter (AFM)
The AFM is what tells the Circuit Opening Relay to keep the pump running after the engine starts. If the AFM is failing, the relay may not get the signal to stay closed. The engine might start but then die immediately . You can bypass the AFM by jumping the Fc and E1 terminals in the diagnostic connector. If the engine runs with those terminals jumped, the AFM is likely the problem .

3. Blown Fuses
Check the EFI fuse (15A or 20A) in the under-hood fuse box. Also check the IGN fuse (7.5A) in the interior fuse box. If the IGN fuse is blown, the EFI relay will not energize, which means no power to the fuel pump system .

4. Water Damage
This is a very common issue with older 4Runners. A leaking windshield allows water to run down the A-pillar and soak the ECU and the Circuit Opening Relay. Over time, the water corrodes the relay contacts and the wiring connectors. If you live in a rainy area or your windshield has ever leaked, this is a strong possibility. Check for signs of rust or water stains on the relay and the connector .

Part Numbers and Where to Buy

The Circuit Opening Relay for the 1989 Toyota 4Runner with the 22R-E engine is a Toyota-specific part. It is not the same as a standard universal relay.

Relay part numbers:

  • Toyota OEM Part Number: 85910-35010
  • Denso Part Number: 056700-8654

You can purchase this relay from a Toyota dealership, online parts retailers, or salvage yards. A used relay from a salvage yard is a good option if you are on a budget, but make sure to test it with a multimeter before buying .

How to Replace the Circuit Opening Relay

Replacing the relay is a straightforward job that takes about 15 minutes.

Tools you need:

  • Small flathead screwdriver or trim removal tool
  • 10mm socket and ratchet (if needed for the kick panel)

Step-by-step replacement:

  1. Disconnect the negative battery terminal. This is a safety precaution.
  2. Remove the passenger side kick panel as described above.
  3. Locate the Circuit Opening Relay above the ECU.
  4. Unplug the wiring harness connector from the relay. It may be tight, so wiggle it gently.
  5. Pull the relay out of its mounting bracket. It may just clip in or have a small screw holding it.
  6. Install the new relay in the bracket.
  7. Plug the wiring harness connector into the new relay. Make sure it clicks into place.
  8. Reinstall the kick panel.
  9. Reconnect the battery.
  10. Turn the key to the ON position and listen for the fuel pump to prime.

Conclusion

The 1989 Toyota 4Runner fuel pump relay location is behind the passenger side kick panel, above the ECU. It is called the Circuit Opening Relay. Before you spend time and money on a new fuel pump, perform the diagnostic connector jumper test. If the pump runs with the jumper, the problem is almost certainly the relay. Replacing the relay is a cheap, fast, and easy fix that will get your 4Runner back on the road.

Recommended Fuel Pump Upgrade: KEMSO Fuel Pump

If you have determined that your fuel pump itself is bad, or if you simply want a reliable, high-performance replacement, we strongly recommend the KEMSO brand fuel pump.

KEMSO fuel pumps are designed as high-performance, OEM replacement units. They are built to meet or exceed the specifications of your original Toyota pump. Each KEMSO pump comes with a lifetime warranty, giving you complete peace of mind that your investment is protected. Whether you are fixing a daily driver or building an off-road adventure rig, a KEMSO fuel pump delivers the reliability and flow you need.

To browse the full selection of KEMSO fuel pumps for your 1989 Toyota 4Runner and other vehicles, visit their official website: https://www.kemsoracing.com/

For more information on KEMSO fuel pumps and their lifetime warranty, please visit https://www.kemsoracing.com/


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