PIN OUT PCM JEEP CHEROKEE 4.OL FULL
It “putters” then kicks into full power & she runs like new. So when I give it gas the engine seems to lag in & out of power. If you wish to eliminate this connector entirely (highly recommended), see Tip #27 – C101 Elimination If you have a small pick or dental tool, tweak the female connectors on the one side so they grab the pins on the opposite side a bit tighter before bolting both halves back together. Wipe out the connectors after spraying with a soft cloth. Repeat this procedure until the tar is totally removed. Follow up by spraying out both connector halves with brake cleaner and then swabbing out the remainder of the tar. Take a pocket screwdriver or the like and scrape out all the tar crap you can. You will find the connector is packed with a black tar-like substance which has hardened over time. To get the connectors apart, simply remove the ¼” bolt and pull the halves apart. It is held together with a single bolt in it’s center. The C101 connector is located on the driver’s side firewall above and behind the brake booster.
Soldering skills are required and it takes about an hour and a half. But, I strongly advocate eliminating the C101 at some point by following the procedure with photos and video in Tip 27. That said, the cleaning described below is a real MUST DO right off the bat for any new-to-you Jeep. Chances are it’s never been done before.Īlmost every critical signal between the engine sensors, injectors, ECU, and some to the TCU, travel this path through the C101 connector. The C101 connector needs to be cleaned at least once in the lifetime of your vehicle. We can only imagine how this connector has become a larger source of voltage loss and increased resistance over a period of more than 25 years. The factory recommended cleaning this connector to insure the proper voltage and ground signals between the ECU and the fuel injection sensors.
So much so that the factory eliminated this connector in the 19 models. The C101 connector on 19 Renix Jeeps was a source of electrical resistance when the vehicles were new.
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