General Location:
* Behind the glove box: The ECM is often located behind the glove box in the passenger compartment.
* Under the hood: Sometimes it's found under the hood, near the firewall.
* On the passenger side firewall: Another common location is on the passenger side firewall, within easy reach.
Finding the ECM:
1. Check the owner's manual: The owner's manual for your 1991 4Runner should have a diagram showing the ECM location.
2. Look for labels: Look for a rectangular black box with a label that says "ECM" or "Engine Control Unit."
3. Consult a repair manual: A repair manual specific to your 4Runner model and year will have detailed diagrams and information on ECM location.
4. Use a diagnostic tool: Some diagnostic tools can scan for the ECM and display its location on a screen.
Important Note:
* Beware of live wires: Always disconnect the battery before working on the ECM or any electrical components.
* Don't tamper with the ECM: The ECM is a sensitive electronic device. Avoid touching or altering any internal components.
Let me know if you have any further questions about your 1991 Toyota 4Runner, and I'll do my best to help!
