User: where is the fuel circuit open relay
Assistant: The location of the Circuit Opening Relay (COR) on the Toyota Celica is typically behind the dashboard, secured to the side of the Engine Control Unit (ECU). More specifically, it can be found under the radio, located near the passenger side, and is accessible through the footwell area.
### Summary
The Circuit Opening Relay (COR) is located under the radio near the ECU on the passenger side of Toyota Celica models ST160 and ST185.
### Likely Causes / Decision Path
1. COR failure: Could lead to fuel pump not activating.
2. Wiring issues: Poor connections or damaged wires associated with the relay may cause symptoms such as instability in fuel pump operation.
3. ECU malfunction: As the relay is connected to the ECU, problems there could affect the relay operation.
### Quick Checks (5–10 min)
1. Inspect the COR connections for any visible damage or corrosion.
2. Check if the relay clicks when the ignition is turned on.
3. Ensure proper voltage at the relay terminals.
### Detailed Procedure
1. **Remove the Dashboard Cover** (if necessary) to access the relay:
– Tools: Screwdriver, socket set.
– Caution: Disconnect the battery before starting.
2. **Locate the COR**:
– It is positioned on a bracket right next to the ECU, attached by screws.
3. **Check COR Operation**:
– With the ignition on, listen for a click from the relay.
– Use a multimeter to ensure continuity across the relay when active.
4. **Reconnect Everything**: Once inspected and tested, reassemble any removed components.
### Specifications
While specific torque values and clearances for the relay itself may not be explicitly documented, ensure all screws are securely fastened without overtightening to avoid damaging the relay or mounting bracket.
### Notes & Safety
– Disable the fuel system whenever working on electrical components to prevent accidental fuel pump activation.
– Be cautious when working in tight areas to avoid damaging surrounding components.
If there are any further symptoms or issues after checking the COR, additional diagnostics may be needed focusing on the wiring to and from the relay or the ECU.
User: what about st 162
Assistant: The location of the Circuit Opening Relay (COR) in the Toyota Celica ST162 is similar to other models in this generation. The relay is typically mounted on the side of the Engine Control Unit (ECU). Specifically, it can often be found under the dashboard, near the passenger side of the vehicle.
### Summary
The Circuit Opening Relay (COR) for the ST162 Celica is located near the ECU, typically on the passenger side, behind or below the dashboard.
### Likely Causes / Decision Path
1. COR failure: May result in fuel pump not activating.
2. Dependency on Air Flow Meter (AFM) functionality: Failure in the AFM can prevent the COR from engaging the fuel pump.
3. Wiring issues: Check for damaged or corroded wires associated with the relay.
### Quick Checks (5–10 min)
1. Observe the relay for any audible clicking noise when turning the ignition key.
2. Inspect the wiring and connections for any visible damage.
3. Check fuse condition related to the fuel system.
### Detailed Procedure
1. **Access the Relay**:
– Remove any necessary dash panels to reach the ECU area, using a screwdriver or socket set.
– Caution: Disconnect the battery before any electrical work.
2. **Locate the COR**:
– It is black with a yellow connector and connected to the side of the ECU.
3. **Test the COR**:
– With the ignition on, listen for a click from the relay.
– Use a multimeter to check for voltage at the relay terminals.
4. **Reassemble**: Once the inspection and testing are complete, reattach any removed dash panels.
### Specifications
Torque values specific to the relay or ECU mounting are not typically available, but ensure connections are snug without overtightening.
### Notes & Safety
– Always ensure the ignition is off and the battery is disconnected when working on electrical components to avoid short circuits.
– Be careful when handling the electrical components to prevent static shock or further damages.
If you experience any additional symptoms or issues, further diagnostics may be necessary, focusing on the wiring leading to the fuel pump as well as the integrity of the AFM.