@DacMack where exactly was your front end collision?
Was it front center, front left or front right? You sure Cyl #2 was not physically damaged?
My Jeep is RHD Export 2002 2.5 CRD so I believe the wiring harness will be totally different. On my Jeep virtually all wires go around the complete engine bay like the Beltway Around Washington.
A connection from say the front wiper to the BCM...a distance of about 18 inches...in my case goes all around the engine bay...through several connectors...through a metal pipe under the radiator and back again to the rear of the engine bay. This is a distance of about 6 feet!
I have never seen a RHD 3.7 Gasser engine layout but from what I can see from the documentation, the wiring to the Plug Packs and the Injectors do not go too far up front but head backwards towards the Firewall and hence to the PCM.
You will need to download the 2005 Jeep KJ Service Manuals here:
www.colorado4wheel.com/manuals/Jeep/KJ/
Go to Section 8W (Wiring) and print out page 8W-30-18 for the Injectors and page 8W-30-19 for the coil packs.
We have to assume that a wire going to either coil pack #2 or going to Injector #2 has an intermittent break in it or an intermittent short to ground or some other random wire in the harness somewhere.
You will need a cheap Digital Multi Meter.
From the two diagrams you see that the top wires of the coil packs and the top wires of the injectors go to +12 volts in the wiring. It is unlikely that there is a fault in this section of wiring as your error code points only to Cyl #2 misfire...unlikely but not impossible! We will cover that later!
So let us start with Page 8W-30-19 for the Coil On Plug #2.
Disconnect the battery and the connectors on the PCM. and disconnect the plug on plug #2. Re-plug the connectors on the PCM several times in case of a bad connection, connect battery up again and test vehicle. If it still fails, disconnect battery and PCM again.
So in theory the Dark Blue/Yellow (DB/YL) wire is hanging in mid air as it has been disconnected at both ends.
With your meter set to Ohms measure this wire from end to end for perfect continuity...make sure you do not touch the meter ends with your bare hands or your body resistance will affect the reading! Best to tape small pins/needles to the meter leads so that you can piece the wire insulation if needed.
While measuring this perfect continuity with the meter set to Ohms, shake the wire harnesses around to see if the meter reading suddenly drops!
Now remove one of the meter leads and fix it firmly to ground somewhere.....should be no reading at all to ground. Shake the harness to see if you get a sudden reading to ground.
Repeat this procedure using page 8W-30-18 for Injector #2 Brown/Dark Blue wire after pulling the connector from Injector #2.
If neither of the above wires display a break/short intermittently...you have to physically cut off the leads at both ends and replace them with new wires.
For example page 8W-30-19 the DB/YL wire for coil on plug wire has to be cut off near C2 pin 9 at the PCM and near the connector at Coil on Plug #2. Tape off the wire at both ends and replace with a new wire soldered onto the cut-off ends and insulated at both end.
If that does not fix the problem repeat the above for the Injector #2.
Lay the new wires over the existing harnesses and tape them down neatly.
Drastic measures but what has to be done if all else fails!
If that does not work...you have to repeat the above procedures for the +12 volt wires Red/Orange or Pink/Grey going to the Coil #2 and Injector #2..unlikely here that there is short to ground as it would affect all cylinders but there may be a break in the wires!
