Jeep Garage  - Jeep Forum

Jeep Garage - Jeep Forum (
-   Troubleshooting/Problems (
-   -   05' 4.7 PCM reset procedure? (

Kevman 10-11-2013 09:35 PM

05' 4.7 PCM reset procedure?
Hi guys,

im looking for the PCM reset procedure for a 05' 4.7 JGC. :confused:

dr.lee.baugh 10-11-2013 09:55 PM

Disconnect the negative on the battery.

Leave it for 20min or hit the brakes for 20s. That will discharge the rest of the system.

Kevman 10-12-2013 06:15 AM

Re: 05' 4.7 PCM reset procedure?
im getting some really conflicting answers,...

this was a procedure i was told is correct:

Disconnect the POSITIVE battery Terminal and touch it to ground for 30 seconds. (This is to discharge the PCM capacitors, which maintain the Adaptive Memory.
Reconnect the Battery Cable
Turn Ignition Switch to the “On” position but DO NOT start the engine
Turn Headlight “On”
Turn Headlights “Off”
Turn Ignition Key “Off”
When you start the engine it will be running off a set of pre-programmed tables that come with the PCM from the factory. When you get the engine up to operating temperature, the PCM will start to collect data for the “Adaptive Memory”. The PCM will collect data for Adaptive Memory for the first 50 Warm-up Cycles.

dr.lee.baugh 10-12-2013 08:37 AM

They are pretty much saying the same thing. Remove electrical and discharge the system (both methods will do that, I prefer disconnecting ground) I don't know about all the flicking of the headlights, etc. Once power is removed, adaptives are cleared. Simple as that. I have done this many, many times and can say with certainty it works on my 05 hemi.

I think either way will get you what you want, and neither will damage the system, so take your pick.

Gojeep 10-13-2013 02:29 AM

Re: 05' 4.7 PCM reset procedure?
Headlights on is to just drain any residual charge from the capcitors etc.

Kevman 10-13-2013 05:09 AM

Re: 05' 4.7 PCM reset procedure?
thanks guys,

just did the reset,... yeah it makes sense that the capacitors will discharge via grounding the (+)ive, switching the lights or any other load for that matter.

cheers all!!

All times are GMT -5. The time now is 05:30 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community