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Unread 03-12-2010, 07:27 PM   #1
FKemp3
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Throttle Position Sensor (TPS) replaced...

2000 TJ w/ 4.0, replaced my TPS today. I had been having a few issues with it idling up and down. I had cleaned My IAC and the port in which it sits. Now with the new TPS installed I'm idling at a steady 1k. This seems a little high to me, though I'm not sure if i had been driving on a failing one for so long, or if i need to look at replacing the IAC too.

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Unread 03-12-2010, 07:29 PM   #2
CJ7-Tim
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Re-boot and clear out the old data.

This very simple procedure will Erase the “Adaptive Memory” stored inside the PCM and allow a new “Adaptive Memory” to be developed.

After performing this procedure the PCM will re-learn and store into Adaptive Memory your engines performance characteristics.

Please perform these steps exactly as they are written, in the order they are written. This will cause the adaptive memory in the PCM to be erased and cause the PCM to go into Fast Learn Mode adaptive mode.

Disconnect the POSITIVE battery Terminal and touch it to ground ( not the battery negative terminal ) for 30 seconds. The engine block or the A/C compressor pump will work as a ground. (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”


The PCM Adaptive memory has now been flashed, or erased from the PCM.

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.
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Unread 03-12-2010, 09:09 PM   #3
FKemp3
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Quote:
Originally Posted by CJ7-Tim View Post
Re-boot and clear out the old data.

This very simple procedure will Erase the “Adaptive Memory” stored inside the PCM and allow a new “Adaptive Memory” to be developed.

After performing this procedure the PCM will re-learn and store into Adaptive Memory your engines performance characteristics.

Please perform these steps exactly as they are written, in the order they are written. This will cause the adaptive memory in the PCM to be erased and cause the PCM to go into Fast Learn Mode adaptive mode.

Disconnect the POSITIVE battery Terminal and touch it to ground ( not the battery negative terminal ) for 30 seconds. The engine block or the A/C compressor pump will work as a ground. (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”


The PCM Adaptive memory has now been flashed, or erased from the PCM.

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.


Thanks! will try this first thing tomorrow and report back.
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Unread 03-13-2010, 06:09 AM   #4
sportcoupe
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After you do that (above) start the jeep and let it idle in the driveway 10-15 minutes before you go driving. That way it can learn all the needed settings.
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Unread 03-13-2010, 06:19 AM   #5
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this may be a stupid question, but can't you just have autozone clear the code with a code reader? or does it not get all of the stored information out? the reason i ask is because i just replaced an O2 sensor (bank one sensor two) and every time i clear it, it comes back in short order...i'm wondering if i need to do what you're saying here...thanks!
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Unread 03-13-2010, 10:08 AM   #6
tulman22
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Does that "clear/re-learn" sequence work with all computers, or just for the jeeps?

Got a 90 Tracker that idles a little high and thinking that could be culprit for it also.
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Unread 03-13-2010, 10:18 AM   #7
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..can't you just have autozone clear the code with a code reader? or does it not get all of the stored information out? ....
AN OBD-II code reader can only delete the trouble codes. It does not delete any Adaptive Memory data.

If you are having a repeated Check Engine Light trouble code you have an issue that needs to be addressed and the trouble codes are your starting point for diagnostic testing.
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Unread 03-13-2010, 10:20 AM   #8
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Originally Posted by tulman22 View Post
Does that "clear/re-learn" sequence work with all computers, or just for the jeeps?.
There may or may not be similar procedures for other vehicle makes, but I would not randomly attempt this on other vehicles until you determine it is safe to do.

Most fuel injected vehicles do have an idle control valve that might need cleaning.
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Unread 03-14-2010, 08:23 AM   #9
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worked perfectly, thanks!
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Unread 03-14-2010, 09:56 AM   #10
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Quote:
Originally Posted by CJ7-Tim View Post
Disconnect the POSITIVE battery Terminal and touch it to ground ( not the battery negative terminal )
Why not the negative battery terminal?
Quote:
Originally Posted by sportcoupe View Post
After you do that (above) start the jeep and let it idle in the driveway 10-15 minutes before you go driving. That way it can learn all the needed settings.
Wrong. The PCM gathers the data over the first 50 start and operating temperature cycles...
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Unread 03-15-2010, 08:25 PM   #11
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Quote:
Originally Posted by Knuckelhead View Post
Why not the negative battery terminal?
Seriously? Because touching the negative battery cable to ground will do NOTHING. LOL. You need to touch the (not connected) positive cable to ground to discharge the capacitors in the PCM that store adaptive memory.

Quote:
Originally Posted by Knuckelhead View Post
Wrong. The PCM gathers the data over the first 50 start and operating temperature cycles...
You clear adaptive memory and the PCM must relearn BASIC running parameters in order to even hold a proper idle. This is only needed when adaptive memory is cleared with the above method. This procedure is also sometimes referred to as "fast learn". What you are referring to is standard learn procedure that form in day to day driving.
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