1. Using an OBD-II Scanner:
* This is the easiest and most reliable method. A scan tool (OBD-II code reader) plugs into the OBD-II port located under the driver's side dashboard. Most auto parts stores will either loan you one for free or scan your vehicle for a small fee. These scanners will display the trouble codes directly. More advanced scanners can even provide more detailed information about the codes.
2. Using the Key Trick (Less Reliable):
This method involves manipulating the ignition switch, and its reliability varies greatly depending on the vehicle's year, model, and specific computer system. It's not as accurate or reliable as using a scanner. Here's the general procedure (but no guarantees it will work on your specific 2001 Ranger):
1. Turn the ignition key to the "ON" position (accessories on, but don't start the engine).
2. Locate the diagnostic connector (OBD-II port). It's usually under the dashboard on the driver's side.
3. Connect a jumper wire (paperclip works in a pinch) between the terminals TE1 (ground) and TE5 (signal). Be extremely careful not to short circuit anything. Consult a wiring diagram if you're unsure about the terminal locations.
4. Carefully observe the "Check Engine" light. It might flash a code indicating a specific problem. The number of flashes (long and short) usually represents a number, this number is then looked up in a Ford Ranger code lookup chart. This method is prone to errors and might not give you all the codes.
Recommendation:
The OBD-II scanner is the strongly recommended method. It's more accurate, provides all stored codes, and eliminates the risk of damaging your vehicle's electrical system. The key trick is unreliable and potentially harmful if done incorrectly. If you are uncomfortable working on your car, take it to a mechanic.
Remember to consult your owner's manual for the specific location of your OBD-II port if you can't find it easily. Once you have the code(s), you can look them up online or in a repair manual to determine the likely cause of the problem.
