What To Know
- Here’s a step-by-step guide on how to reset the ECU on a Subaru Forester.
- Connect the positive probe to the “ST” terminal in the diagnostic port.
- However, if you use the ECU reset to mask an underlying issue, and that issue later causes damage, the repair may not be covered under warranty.
Experiencing issues with your Subaru Forester‘s performance, fuel efficiency, or emissions? Resetting the Engine Control Unit (ECU) can often resolve these problems. Here’s a step-by-step guide on how to reset the ECU on a Subaru Forester.
Before You Start
- Park your Forester on a level surface and engage the parking brake.
- Allow the engine to cool down completely.
- Gather the following tools: a 10mm socket wrench, a flat-head screwdriver, and a multimeter.
Steps
1. Disconnect the Negative Battery Terminal
- Locate the negative battery terminal on the battery.
- Loosen the 10mm nut securing the terminal using the wrench.
- Carefully lift the terminal off the battery.
2. Wait 10 Minutes
- This allows the residual voltage in the electrical system to dissipate.
3. Reconnect the Negative Battery Terminal
- After 10 minutes, reconnect the negative battery terminal to the battery.
- Tighten the nut using the wrench.
4. Locate the Diagnostic Port
- Open the hood and locate the diagnostic port. It’s usually found under the steering column or near the fuse box.
5. Connect the Multimeter
- Set the multimeter to the 20V DC setting.
- Connect the positive probe to the “ST” terminal in the diagnostic port.
- Connect the negative probe to the “GND” terminal.
6. Turn the Ignition On
- Turn the ignition switch to the “ON” position, but do not start the engine.
7. Press the Brake Pedal
- Firmly press and hold the brake pedal for 10 seconds.
8. Release the Brake Pedal
- Release the brake pedal and wait for 5 seconds.
9. Repeat Steps 7-8
- Repeat steps 7 and 8 three more times.
10. Start the Engine
- Start the engine and let it idle for 5 minutes.
11. Check the Multimeter
- Observe the multimeter reading. It should be between 0.5V and 1.5V. If it’s outside this range, there may be an underlying issue.
12. Reset the ECU
- Turn the ignition switch to the “OFF” position.
- Disconnect the negative battery terminal again.
- Wait 10 minutes.
- Reconnect the negative battery terminal.
Additional Tips
- If you have a code reader, you can use it to clear any stored fault codes after resetting the ECU.
- If the ECU reset doesn’t resolve the issues you’re experiencing, seek professional assistance from a qualified mechanic.
- Resetting the ECU will erase any custom settings you’ve made, such as radio presets or seat positions.
Final Note: Restoring Performance and Efficiency
By following these steps, you can successfully reset the ECU on your Subaru Forester and potentially resolve various performance issues. This simple procedure can restore your vehicle’s optimal performance, fuel efficiency, and emissions.
What People Want to Know
1. Can I reset the ECU without disconnecting the battery?
No, disconnecting the battery is essential for resetting the ECU. It ensures that all residual voltage is dissipated, allowing the ECU to restart with a clean slate.
2. How often should I reset the ECU?
Resetting the ECU is generally not necessary unless you’re experiencing specific issues. If you notice any performance problems or decreased fuel efficiency, you can try resetting the ECU as a potential solution.
3. Will resetting the ECU affect my vehicle’s warranty?
Resetting the ECU itself will not void your vehicle’s warranty. However, if you use the ECU reset to mask an underlying issue, and that issue later causes damage, the repair may not be covered under warranty.