Mercury Repair Questions? Ask a Mechanic for Answers ASAP
The PATS light staying on means the anti-theft system is active. It should disarm with an original key or remote fob. However, if an original key or remote is not available or if the system won't disarm at all, then the PATS needs to be diagnosed by either an authorized Ford repair facility or a licensed locksmith.
I'm not familiar with snap on solus, but as far as I know PATS communicates only with NGS.
In any case, it shouldn't be too hard to check the starting circuit and find out whether PATS is or not the culprit. Would you like me to upload the starting circuit diagram so we can both follow along? If so, what engine is in that Cougar, 4 or V6? Auto or stick?
OK. I've attached the circuit diagram plus the relay box lay out showing the starter diode and the relay. Please let me know when you're ready.
Did I loose you?
OK, but we don't need to check the diode just yet. First, let's eliminate PATS as the culprit.
Remove the starter relay and check for ground at relay socket terminal 86 with the clutch pedal pressed in and the ignition switch turned to START. If no ground, check both Black/Green or Black/Yellow wires at the start inhibit switch on the clutch pedal bracket. If no ground, either PATS is on, or the wire is broken between the computer and the inhibitor switch, or the onboard computer is bad.
If PATS is on, the starter relay can be manually grounded, but the computer will not supply fuel or spark to the engine.
If there is ground at starter relay terminal 86, then we need to check the power side of the circuit, which is not affected by PATS.
Please let me know what you find.
One way to find socket terminal 86 is looking at the numbers by each terminal blade on the relay; another way to check if there is ground is to check all the relay socket terminals with the clutch pedal pressed in and the ignition switch turned to START, two of the socket terminals should have voltage, one should be open (no ground or power) and one ground.
Regarding the switch at the clutch; it is an interrupter, both wires should be the same color as they are parts of the same circuit. One of the wires should have ground with the ignition switch turned to START, then both wires should have ground when the clutch pedal is pressed in.
Here is the relay pin-out - being that Mazda had a hand on the design of the vehicle, ground could be either on 85 or 86
Good. How about power, do you have power at relay terminals 2 and 3 with ignition turned to START?
What compelled you to jump from testing powers and grounds to scanning for codes? Is there ground at relay terminal 1 or not?
You told me the relay pins were numbered 1 through 5, so let's keep that criteria, as it matches what's on the diagram. Power at terminal 1 with switches on START means the onboard computer is not grounding the starter relay because PATS is telling it the car is being stolen.
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