What is CIR OPN relay?
The current flows to the C/OPN (Circuit Opening) relay by turning the Tr1 ON. Then, the fuel pump operates. While the NE signal is input into the ECM, when the engine is running, the ECM turns the Tr1 on continuously.
What does the EFI main relay do?
The main relay helps to ensure that the engine computer gets the power that it needs to run and function as intended. The main relay is usually located underneath the hood in the relay box. The high heat that this relay is exposed to can create a lot of damage over time.
What are the symptoms of a bad fuel relay?
Here are the symptoms of a bad or failing fuel pump relay
- Engine stalls. One of the first symptoms of an issue with the fuel pump relay is an engine that suddenly stalls.
- Engine does not start. Another symptom of a faulty fuel pump relay is an engine that does not start.
- No noise from the fuel pump.
What does the EFI fuse control?
EFI fuse powers your circuit opening relay,fuelpump and sender,O2 sensors, IAC valve,MAF meter, VSV for EGR, VSV for EVAP, VSV for pressure sensor, ECM, and Point side of the EFI relay.
What is M G CLT relay?
The MG CLT relay controls the Magnetic Clutch for the A/C compressor.
What is C OPN relay Toyota?
C/OPN is circuit opening relay. I believe it works with your fuel pump relay to shut off fuel when the engine is not running. You need a signal from your ECU to start and a signal from your AFM to run.
What causes a main relay to fail?
Even in low-level signal applications, accidents and faulty UUTs can cause relay failures, and inrush currents, caused by hot-switching capacitive loads, and voltage spikes, caused by hot-switching inductive loads, accelerate relay aging. Below are examples of failed relays.
How do you know if a relay is working?
The only tool required to check a relay is a multimeter. With the relay removed from the fuse box, the multimeter set to measure DC voltage and the switch in the cab activated, first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in (or wherever the relay is located).
Where is the EFI fuse located?
It is often found in the fuse box located in the engine bay and functions as the primary electronic switch that controls power to the fuel pump.
What is EFI No 2 fuse?
EFI#2 fuse powers the MAF, oxygen sensors and evap solenoids.
Where is the fuse panel on a Toyota Camry?
If the replaced fuse blows again, have the vehicle inspected by any authorized Toyota dealer or repairer, or another duly qualified and equipped professional. The fuse panel is located behind the coin tray on the driver’s side of the dashboard. Engine Coolant Temp.
How to troubleshoot electrical wiring in a Toyota Camry?
When the circuit operation is understood, begin troubleshooting of the problem circuit to isolate the cause. Use Relay Location and Electrical Wiring Routing sections to find each part, junction block and wiring harness connectors, wiring harness and wiring harness connectors and ground points of each system circuit.
Where is the fuel pump relay on a Toyota?
The relay you are talking about is called the “Circuit Opening Relay” and is located on top of the ECU, which is between the driver and passenger footwell behind the radio. You can get to it by pulling back the front inner corner of the passenger carpet.
What are the main relay circuits in a Toyota?
Toyota utilizes several different EFI Main Relay circuits depending on application. These circuits can be categorized into four distinct types. 1) Dual contact EFI Main Relay, ignition switch controlled 2) Single contact EFI Main Relay, ignition switch controlled 3) Dual EFI Main Relays, ignition switch or ECU controlled