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Reduced power?

Tiny
TERHUNE
  • MEMBER
  • 2002 ISUZU TROOPER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 146,000 MILES
Started stalling and mass air flow sensor was replaced. Upon cranking engine will rev up and then idles high and low repeats. Will drive but after driving for some time the reduced power light comes on and accelerates at 30mph. PCM is ok but no codes are coming up.
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Monday, June 30th, 2008 AT 5:02 PM

5 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
There should be codes stored, go to Autozone they read em for free, post the results here. If no check engine light, or no codes stored, check for power to the PCM. Check all fuses under the hood, marked PCM or ECM....This guide will help us fix it

https://www.2carpros.com/articles/reduced-power-limp-mode

Please run down this guide and report back.
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Monday, June 30th, 2008 AT 6:27 PM
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 1992 ISUZU TROOPER
  • 260,000 MILES
The ecm last year went into back up timing mode do to extreme exhaust leak. Since then all repairs have been made. No diagnostic equipment was ever used to read or clear the ecm, resulting in several months of off and on limp mode. This happened in winter, at temps. Of 32 degrees or o degrees celci us. Now the same time of year and temperature the 3.2litre 1992 tropper was running great, came out to start it and it would only turn over. Also the heater is not working yet all fuses in and out of vehicle have continuity. My question to you is can it be possible to restore the ecm's internal internal clock to a time pryer to these events or some other method without the use of any dianostic tools
.
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Thursday, September 24th, 2020 AT 10:54 AM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
https://www.2carpros.com/articles/odb1-isuzu-1985-1994-cars-and-trucks-code-retrieval-procedure-and-definition

Check aboce link on how to retrieve trouble codes and let us know what they are.
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Thursday, September 24th, 2020 AT 10:54 AM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 1992 ISUZU TROOPER
  • 260,000 MILES
Tropper stuck in limp mode. All repairs have been made. Is the only way to clear the ecm is with a diagnostic scanner, because unhooking the battery dont work. Help please
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Thursday, September 24th, 2020 AT 10:54 AM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
If a fault has been detected and not rectified, resetting is futile. You need to retrieve the trouble code and proceed from there.
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Thursday, September 24th, 2020 AT 10:54 AM (Merged)

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Related Engine Computer Limp Mode - Reduced Power Content

Reduced Power - Limp Mode
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Reduced Power - Limp Mode
The computer system that controls your car has a built in safety feature called "Reduced Power" or "Limp Mode" which is designed to get the car where it is...
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