94 Toyota Camry Fuel Pump Relay: Location, Tests, and Fixes
If your 1994 Toyota Camry cranks but will not start, do not buy a fuel pump relay first. On this car, the fuel pump is controlled by a circuit opening relay working together with the EFI main relay, the EFI fuse, the ignition switch circuit, and the pump itself. On many 1994 Camrys, including 2.2L four-cylinder models, the circuit opening relay is behind or above the glove box, while the EFI main relay is in the engine-compartment fuse and relay box; a published 1994 XLE wiring diagram also places the circuit opening relay behind the glove box . Some online answers place a fuel pump relay directly in the under-hood box, so check the lid diagram, your owner’s manual, and a wiring diagram for your exact engine and trim before ordering a part . The most useful first checks are battery condition, fuses, power at the relay connector, pump operation through the diagnostic connector, and fuel pressure. This order saves money because a relay, a fuse, a wiring fault, and a worn pump can produce nearly the same no-start complaint .
1. Know what the name means before you buy a part
Parts catalogs and repair discussions use several names for the same general control part: fuel pump relay, circuit opening relay, C/OPN relay, and occasionally fuel pump circuit opening relay. Toyota’s XV10-era fuel pump circuit includes two important relays: the EFI main relay and the circuit opening relay . A service-information source describes the EFI main relay as being in the engine-compartment junction block on the left inner fender and the circuit opening relay in a relay block above the glove box for the 1994–1995 2.2L Camry . A 1994 Camry fuse-box reference also lists a circuit opening relay among the relays behind the glove box .
That distinction matters in U.S. auto-parts stores. Search results may show a five-terminal relay listed for a 1992–1996 Camry, such as Standard Motor Products RY358, described as a circuit opening relay that controls power to the fuel pump system . A Toyota parts listing also associates part number 90987-02009 and its supersessions with 1994 Camry relay applications, but that catalog page groups several relay uses on one listing rather than proving the number for every fuel pump circuit . Match the part by VIN, engine, production date, terminal count, connector shape, and the factory diagram. Do not choose solely from a generic year-make-model drop-down.
A common mistake is expecting the pump to make a two-second priming noise every time the key reaches ON. On these Camrys, power is generally supplied while the engine is cranking or running, not merely because the key has been turned to ON . Toyota’s XV10 check procedure describes jumpering the +B and FP terminals of the diagnostic connector with the ignition on to run the pump for testing . Silence at key-on alone is not proof that the relay has failed.
2. Start with the symptoms you can verify
Write down what the car actually does. A clean description keeps the diagnosis focused and helps a mechanic reproduce the fault.
1. Long cranking before a cold start. The engine eventually starts and runs normally. This may involve fuel pressure, a restricted filter, a weak pump, ignition components, or an electrical supply problem. A fuel pump can produce hard starting, extended cranking, rough running, or stalling, but those symptoms are shared by other fuel and ignition faults .
2. Cranks normally but never fires. Confirm spark and then check whether fuel pressure reaches specification. A published check procedure for the XV10 says to inspect the 15A EFI fuse, the 30A AM2 fuse, the EFI main relay, the pump, and its electrical circuit if the pump does not operate during the +B-to-FP test . A fuse-box reference for the 1994 Camry also identifies a 15A EFI fuse .
3. Starts, then stalls. Look for pump power disappearing as the engine stops, a failing electrical connection, or a pump that quits when hot. A 1994 Camry owner reported a hot no-restart condition with spark present but no voltage at the pump; replacing the pump and relay did not fix it, which shows why voltage and control-circuit testing should come before more parts .
4. Hesitation or power loss under load. A weak pump, clogged filter, or pressure-regulation problem may show up first on the highway or during acceleration . Do not assume that a relay causes intermittent hesitation; a simple electromechanical relay more often causes a complete loss of pump power than a small, repeatable pressure shortage.
5. Loud whining from the tank. A changing pump noise deserves attention, but noise by itself does not establish whether the pump, its inlet strainer, or the relay is at fault . Measure pressure and inspect electrical supply before replacing components.
If the engine stalls in traffic or loses power at highway speed, arrange diagnosis instead of continuing to drive. Sudden loss of propulsion can affect power steering and brake assist .
3. Find the correct relay on your exact Camry
Pop the hood and read the map on the underside of the engine-compartment fuse and relay box cover. Then inspect the cabin panels. Published guidance for 1994 Toyotas advises checking both the engine-bay fuse/relay box and the interior fuse box, using the lid diagram or a model-specific service manual because placement varies . For the 1994 2.2L Camry, a fuel-circuit diagram identifies Relay Block 6 above the glove box as the circuit opening relay location and Junction Block 2 on the left inner fender as the EFI main relay location . A 1994 XLE wiring-diagram component list likewise says “circuit opening relay … behind glove box” . One professional Q&A places the circuit opening relay ahead of the center console .
That disagreement is not a reason to guess. It reflects different model references, market versions, and production changes. Use this practical order:
1. Read both fuse-box diagrams. Look for C/OPN, EFI, FUEL PUMP, or FP. A general 1994 Camry fuse reference lists a circuit opening relay behind the glove box and a separate relay box in the engine compartment .
2. Compare the relay’s terminal count and shape. The RY358 listing describes a five-terminal, 10-amp circuit opening relay for applicable 1992–1996 Camrys . Other relays in the boxes may look similar, so the label and wiring diagram matter more than appearance.
3. Pull one relay at a time. Note its position, inspect the socket for corrosion, pushed-out terminals, heat discoloration, or loose fit, and reinstall it before removing another. A loose socket can imitate a bad relay.
4. Use the VIN and production date. A 1994 parts diagram distinguishes applications from October 1994 onward, so an early-build car and a late-build car may not use identical listings .
4. Use a safe, repeatable test sequence
Work outdoors or in a well-ventilated area. Keep sparks, flames, and cigarettes away from fuel vapor. Wear eye protection, chock the wheels, and keep a rated fire extinguisher within reach. Disconnect the negative battery cable before unplugging fuel-system wiring. If you smell raw gasoline or see a leak, stop and have the car repaired professionally .
1. Confirm the basics. Make sure the tank has enough gasoline and the battery can crank the engine at normal speed. Low voltage changes relay and pump behavior. A general XV10 check also starts by confirming there is sufficient fuel .
2. Inspect the fuses with a test light or multimeter. Check the 15A EFI fuse and the 30A AM2 fuse named in the factory-style pump check . A visual check can miss a hairline crack. Verify power on both sides of each fuse with the ignition in the required position.
3. Check power into the relay circuit. Toyota’s XV10 procedure says to remove the EFI main relay, turn the ignition on, and check for battery voltage at the relay connector terminals; if present, reinstall the relay and check that voltage reaches the circuit opening relay . Use a wiring diagram for your engine to identify the terminals. Do not probe random cavities or force a thick test probe into a small female terminal.
4. Try the factory diagnostic bypass where applicable. The XV10 procedure calls for connecting +B and FP at the check connector with the ignition on, then listening for pump operation; the jumper is removed afterward and the connector cover closed . Owners of 1994 2.2L cars describe using the data link connector or a check connector near the air cleaner for this test . A forum discussion notes that jumping FP to B+ bypasses the circuit opening relay, starter relay, and park/neutral switch, while still depending on the main EFI relay . Use the correct terminals from a 1994-specific diagram. An incorrect jumper can damage wiring.
5. Listen at the fuel tank, not only under the hood. Have a helper activate the proper test while you listen near the tank or filler area. A published check suggests listening at the filler neck for a short buzzing sound as a preliminary indication of pump operation . On this generation, the pump normally receives power during cranking or running, so a silent key-on period is not conclusive .
6. Check voltage at the pump connector. The rear-seat cushion provides access to the pump harness on some 1994 four-cylinder Camrys; one owner discussion identifies the pump motor terminals and gives a resistance range of 0.2–3.0 ohms for that application . Treat resistance figures as application-specific and confirm them against a service manual. Voltage at the pump with no pump operation points toward the pump or its ground; no voltage points upstream toward relays, fuses, switches, or wiring.
7. Measure fuel pressure. A 1994 3.0L V6 test guide uses a gauge connected at the output side of the fuel filter, with the engine off and the +B and FP terminals jumpered . Use the pressure specification for your exact engine, not a figure from a different Camry generation. Pressure below specification can come from the pump, filter, regulator, or supply voltage.
8. Bench-check the relay only after the circuit has power. Toyota’s XV10 check includes an ohmmeter test of continuity between specified relay terminals and a check of the relay’s energized state . Terminal numbering differs by relay, so follow the correct diagram. A relay that clicks is not automatically good; burned contacts can pass a click test and still drop voltage.
5. Interpret the results without throwing parts at the car
The pump runs with +B and FP jumpered but not normally: the pump motor can operate, so inspect the EFI main relay, circuit opening relay, ignition and starter signals, park/neutral circuit where applicable, fuses, and wiring. The jumper bypasses several control parts but not all of the supply circuit .
No pump operation even with the correct jumper: check the EFI main relay, EFI and AM2 fuses, pump connector, ground, pump motor, and the wiring between them . A failed pump remains possible.
Power and ground reach the pump, but pressure is low: test the pump, filter, regulator, and fuel lines. A weak pump can cause hard starting, rough running, and loss of power, but a restricted filter can create similar complaints .
The relay works cold and fails hot: swap in a known-correct relay of the identical part number only as a controlled test, then inspect for heat damage and voltage drop. A heat-related no-start may originate elsewhere in the circuit, as one 1994 Camry case demonstrated after a pump and relay replacement failed to solve it .
A new fuse blows again: stop replacing fuses. Look for a shorted wire or component and get professional help if the fault is hard to trace .
6. Replace the relay correctly when the tests confirm it
Disconnect the negative battery cable, remove the cover or trim panel carefully, and pull the identified relay straight out without rocking it hard enough to crack the socket. Compare the old and new units side by side: terminal count, blade layout, housing shape, mounting tab, marking, and current rating. The RY358 listing shows that an aftermarket circuit opening relay is sold for applicable 1992–1996 Camrys as a five-terminal unit . Press the replacement fully into place, restore the battery connection, and repeat the same voltage, pump-operation, and pressure checks. A successful start once is not enough; road-test the car after confirming there are no leaks or abnormal noises.
Keep the old relay if it tests good. Label it with the date and the symptom. A tested-original part can help a mechanic compare behavior later.
7. Decide whether the pump itself needs replacement
A relay cannot restore pressure from a worn pump. Before opening the fuel system, match the complaint to measured results: no pump operation with correct supply voltage and ground, pressure outside the engine’s specification, or a pump that stops when hot. General diagnostic guidance recommends confirming electrical supply and measuring fuel pressure rather than relying on sound or a single symptom .
On many vehicles, the pump sits inside the tank and is reached by lowering the tank or through an access panel under the rear seat or in the trunk . Fuel-system work calls for relieving pressure, disconnecting the battery, working in a ventilated area, and keeping an extinguisher nearby . Installation guidance also stresses a clean tank sealing surface, a new gasket or O-ring, correctly seated fuel lines and electrical connector, and a leak check after priming . If you see damaged wiring, smell fuel, or cannot complete a leak-free repair, hand the job to a qualified shop .
Two habits help a replacement last: keep the tank above roughly one-quarter full when practical, because fuel helps cool and lubricate an in-tank pump, and replace a contaminated or restricted filter according to the maintenance schedule. Repeatedly running very low on fuel and using poor-quality replacement parts are listed among conditions that shorten pump life .
8. Costs, parts sourcing, and records for U.S. owners
Prices vary with brand and availability. One listing showed an aftermarket circuit opening relay at $140.96, which is a reminder to verify the exact application and compare Toyota, established aftermarket, and salvage options rather than paying for a mislabeled part . Ask the counter to confirm the VIN, engine, and production month. Keep the invoice and the part number.
For diagnosis, a digital multimeter, a test light, a fuel-pressure gauge with the right adapter, gloves, eye protection, and the correct wiring diagram are more useful than a handful of guesswork relays. A 1994 3.0L V6 guide notes that suitable fuel-pressure test kits include the fitting needed for that Toyota fuel system . If you do not own the gauge, many U.S. parts stores loan tools with a refundable deposit.
Record these details before calling a shop: engine size, VIN, mileage, whether the engine has spark, whether the pump runs during the correct test, voltage readings at the relay and pump, fuel-pressure reading, fuse condition, and whether the fault occurs cold or hot. This lets a technician continue from measured evidence.
9. A recommended replacement pump
When testing confirms that the pump, rather than the 94 Toyota Camry fuel pump relay or its supply circuit, has failed, consider KEMSO Fuel Pumps. KEMSO describes its pumps as high-performance, OEM replacement units designed to meet or exceed factory specifications, with consistent pressure and flow for stock vehicles and additional flow capacity for upgraded applications . The brand also states that its fuel pumps come with a lifetime warranty, giving the original owner long-term protection against a repeat purchase . Check fitment for your exact 1994 Camry engine before ordering, and follow the warranty terms supplied with the part.
To review the current catalog and confirm the correct application, visit https://www.kemsoracing.com/ . A direct-fit pump, a clean installation, and a verified electrical supply are the three details that matter most after diagnosis.
10. Practical closing checklist
1. Identify the circuit opening relay and EFI main relay from a 1994 Camry diagram for your engine, then confirm the label on the car .
2. Check the EFI and AM2 fuses, battery voltage, relay connector power, and grounds before buying parts .
3. Use the +B-to-FP test only with the correct connector and diagram, then verify pump operation and fuel pressure .
4. Replace only the part proven faulty, retest the whole circuit, and inspect for leaks .
5. Get professional help for recurring blown fuses, fuel smells, damaged wiring, or an intermittent fault that basic tests cannot reproduce .
Most no-start complaints on this generation are solved by methodical electrical checks, not by swapping every relay in the boxes. Start with the diagram, verify power where it should be, and let the measurements decide which part leaves the car.