Here's why:
* Ticking Sound: This is often associated with the PATS system attempting to communicate with the ignition system. The sound might be a relay clicking repeatedly, indicating a failure to authenticate the key.
* Door Open Condition: The PATS system sometimes uses a door open sensor as part of its security protocol. Having the door open might be affecting the system's ability to properly communicate and authorize the start. It might also mean that a fault in the door switch circuit is interfering with the PATS system’s operation.
* Will Not Start: The most likely reason for the no-start condition is the PATS system refusing to authorize the ignition due to a key issue, a faulty receiver, or a problem within the system's wiring or components.
Possible Causes:
* Faulty PATS Key: The transponder chip in your key might be damaged or its battery might be dead (if it's a newer-style key).
* Low Battery Voltage: A low battery could impact the PATS system's ability to function properly. The ticking could be the system trying to draw enough power to communicate.
* Faulty PATS Receiver: The receiver in the steering column (which reads the key's transponder) might be malfunctioning.
* Wiring Issues: Damaged or corroded wiring in the PATS system's circuitry could disrupt its operation.
* Faulty PATS Module: The PATS module itself might have failed.
* Other Security System Issues: While less likely, there might be other security system components or alarms contributing to the problem.
Troubleshooting Steps:
1. Try a Spare Key: If you have a second key, try that one. If it works, your original key is the problem.
2. Check the Battery Voltage: Use a multimeter to check the battery voltage. It should be above 12.6 volts.
3. Check the Door Switch: See if the issue persists with the door closed. If the ticking stops when the door is closed, it might point to a faulty door ajar switch or its wiring.
4. Listen Carefully to the Ticking: Try to pinpoint the location of the ticking sound under the dash. This can help you narrow down the possible faulty component.
5. Consult a Repair Manual: A Ford Ranger repair manual can provide detailed diagrams of the PATS system and help you locate components.
If none of these steps resolve the issue, it's best to take your truck to a qualified mechanic or an automotive locksmith specializing in PATS systems. Attempting advanced PATS diagnostics or repairs without the proper knowledge and equipment can be complicated and may lead to further problems.
