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Reduced power mode
11-04-2011, 08:56 PM
Post: #1
Reduced power mode
I have a 2000 Trooper that will go into reduced power mode when it is below 38 Deg. F outside. When the temp is above that it runs fine. I checked to resistance of the intake air temp sensor and it apears to be fine with the manuel specs as dose the engine water temp sensor. I pulled them out and put them in the freezer, then monitored them chaginging in resistance. The battery is also at full charge. I also checked for bad connections at the PCM and for broken wires. I do not have a scan tool and no one around for 200 miles that dose. Dose anyone have any suggestions of were the fault could be? Going nuts here.
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11-05-2011, 11:01 AM (This post was last modified: 11-05-2011 11:02 AM by Rupe.)
Post: #2
RE: Reduced power mode
I was not aware that it had a reduced power mode and was wondering if it's just reduced power because of something silly like a partially clogged fuel filter where small amounts of moisture are freezing with the cooler temps. Of course a moisture laden filter will restrict the flow anyway and more fuel is needed when it's cold out. IOW, the moisture doesn't have to freeze to cause an issue.

If nothing else, at least remove the fuel filter and quickly drain it into a clear container. See what's in there after it settles. After it's drained for a few moments try to blow through it. Should flow easily with no resistance if it's clear. Replacing the filter may fix your problem and if nothing else it's cheap insurance to know that's not your issue so you can move on to other things.
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11-07-2011, 03:16 PM (This post was last modified: 11-07-2011 03:18 PM by resslrg.)
Post: #3
RE: Reduced power mode
(11-05-2011 11:01 AM)Rupe Wrote:  I was not aware that it had a reduced power mode and was wondering if it's just reduced power because of something silly like a partially clogged fuel filter where small amounts of moisture are freezing with the cooler temps. Of course a moisture laden filter will restrict the flow anyway and more fuel is needed when it's cold out. IOW, the moisture doesn't have to freeze to cause an issue.

If nothing else, at least remove the fuel filter and quickly drain it into a clear container. See what's in there after it settles. After it's drained for a few moments try to blow through it. Should flow easily with no resistance if it's clear. Replacing the filter may fix your problem and if nothing else it's cheap insurance to know that's not your issue so you can move on to other things.


Thanks for the suggestion. It dose have a reduced power mode. It even has an idiot light for just that. I will check out the filter anyhow, like you said it couldn't hurt.


Thanks for the suggestion. It dose have a reduced power mode. It even has an idiot light for just that. I will check out the filter anyhow, like you said it couldn't hurt.

Thanks Rick
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11-07-2011, 09:26 PM
Post: #4
RE: Reduced power mode
From everything that I have read on this subject it sounds like you might actually save time and money by letting the dealer fix it. The first thing that you need is the computer scanned. It is likely going to show a bunch of codes. If you start changing everything that sets a code you could spend several hundred dollars and; from what I've read, you still won't have it fixed.

Basically; if I understand it correctly, you have a Throttle Position Sensor out on the engine, an Accelerator Position Sensor inside on the accelerator pedal, and several other engine sensors get involved including the Engine Temperature Sensor. The computer looks at the Engine Temperature, Engine RPM's, Throttle Position, and Accelerator Position. If it determines that the Throttle and Accelerator aren't in the proper position for the RPM's and Temperature it will put the engine in Reduced Power Mode. The problem is that it can be any one or more of the above sensors, a bad connection, a damaged or broken wire, a plugged filter (as Rupe mentioned) or several other things.

Since you are having the problem with a temperature change I think that I would price the Engine Temperature Sensor. If it wasn't real expensive you may just luck out by changing it??? Remember though that there are usually more than one temperature sensor. Here again, getting the codes and some live data via a scanner may show you the correct one saving you time and money?

Please let us know what you find.

Thanks for using the forum,
Garner

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11-08-2011, 02:06 AM (This post was last modified: 11-08-2011 02:16 AM by resslrg.)
Post: #5
RE: Reduced power mode
(11-07-2011 09:26 PM)Garner Wrote:  From everything that I have read on this subject it sounds like you might actually save time and money by letting the dealer fix it. The first thing that you need is the computer scanned. It is likely going to show a bunch of codes. If you start changing everything that sets a code you could spend several hundred dollars and; from what I've read, you still won't have it fixed.

Basically; if I understand it correctly, you have a Throttle Position Sensor out on the engine, an Accelerator Position Sensor inside on the accelerator pedal, and several other engine sensors get involved including the Engine Temperature Sensor. The computer looks at the Engine Temperature, Engine RPM's, Throttle Position, and Accelerator Position. If it determines that the Throttle and Accelerator aren't in the proper position for the RPM's and Temperature it will put the engine in Reduced Power Mode. The problem is that it can be any one or more of the above sensors, a bad connection, a damaged or broken wire, a plugged filter (as Rupe mentioned) or several other things.

Since you are having the problem with a temperature change I think that I would price the Engine Temperature Sensor. If it wasn't real expensive you may just luck out by changing it??? Remember though that there are usually more than one temperature sensor. Here again, getting the codes and some live data via a scanner may show you the correct one saving you time and money?

Please let us know what you find.


Thanks for the input. I changed the engine water temp. sensor. Now waiting for a cold day to test it. I ordered the fuel filter and the intake air sensor. They should be in tommarow. It is fustrating having to wait on mother nature to trouble shoot. Can't complain too much on having 60 deg weather in Nov. in Michigan. I understand where your coming from on getting a computer scan however it is a long drive to the nearest dealership.
Thanks for any input and ideas. Will keep you informed.

Rick
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11-08-2011, 08:36 PM
Post: #6
RE: Reduced power mode
It's hard for me to fathom that nobody in your area has a scanner. I live in a country setting and I can go any direction N, S, E, or W for less than 15 miles and find a garage with a scanner. The other good thing is that most of the people here that have them also know how to use them. If you're going to spend five thousand bucks on a tool you have to know how to use it to make it pay for itself. With virtually every car for over 20 years having a computer a scanner is nearly as important to a garage as the hoist. Some people still work on the floor with jack stands & some still don't have scanners. Both just seems weird to me!

Thanks for the update. Let us know what happens when the nice weather fails.

Thanks for using the forum,
Garner

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11-10-2011, 01:46 AM
Post: #7
RE: Reduced power mode
(11-08-2011 08:36 PM)Garner Wrote:  It's hard for me to fathom that nobody in your area has a scanner. I live in a country setting and I can go any direction N, S, E, or W for less than 15 miles and find a garage with a scanner. The other good thing is that most of the people here that have them also know how to use them. If you're going to spend five thousand bucks on a tool you have to know how to use it to make it pay for itself. With virtually every car for over 20 years having a computer a scanner is nearly as important to a garage as the hoist. Some people still work on the floor with jack stands & some still don't have scanners. Both just seems weird to me!

Thanks for the update. Let us know what happens when the nice weather fails.
I know it seems weid no one has the software here for this truck. The local inort shop and autozone and advanced auto no go. I have changed the sensors and awaiting a cold day to test. Forcast is this week. I also purchased a fuel filter. I will install that if sensors do not fix the problem. Thanks for everyones input.
Rick
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