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Engine wiring diagrams please?

Tiny
MTNBIKER
  • MEMBER
  • 2001 ISUZU RODEO
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 79,000 MILES
I get a check engine-reduced power lights after engine start. It seems to only happen when temperatures are 40 degrees or lower. The engine surges when idling. It will not go over 20 mph if I try to drive it. I have seen quite a few posts like tbi one but no real solutions. I need to check the engine wiring can you please give me the wiring diagrams? Here are the codes I get:
P1515 TP Sensor to MAF Sensor correlation
P1125 Electronic Throttle Control Limit performance mode.
P1295 Electronic Throttle Control -Power management mode.

I am assuming these codes lead me to several things: Mass Air flow sensor, Throttle position sensor and possibly the EGR Valve. I am not sure what to do or where to go from there.
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Monday, November 8th, 2010 AT 1:09 PM

19 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Here is a guide to help you with the wiring testing with the engine wiring diagrams below.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.

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Wednesday, November 10th, 2010 AT 12:39 PM
Tiny
MTNBIKER
  • MEMBER
  • 4 POSTS
Thank you for the info! I am working the diagrams right now. I will let you know how it comes out. The engine is a 3.2L.
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Sunday, November 14th, 2010 AT 6:35 PM
Tiny
M4RIS4
  • MEMBER
  • 1 POST
I'm having the same issue with my 2002 Isuzu Rodeo - reduced power light comes on with the check engine light only in cold weather (started this year a few weeks ago). Last year I replaced the TPS, but don't think that is the problem. My truck is the 3.2L model.

The codes are
P1125 Electronic Throttle Control Limit performance mode.
P1295 Electronic Throttle Control Power management mode.

Thanks.
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Wednesday, December 29th, 2010 AT 11:29 PM
Tiny
MTNBIKER
  • MEMBER
  • 4 POSTS
I followed the diagrams. It pointed me to the TPS. I replaced it for about 80 bucks. That did the trick! I'm back up and running. Thank you for the help!
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Thursday, December 30th, 2010 AT 5:06 PM
Tiny
MEDICTECH
  • MEMBER
  • 1 POST
I'm having the same issue with the reduced power mode. I cleaned the maf sensor, replaced the fuel filter, and did what I could to clean the egr valve. That seemed to work for about a day and then it came back on.

Can anyone point me to it please?
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Friday, July 20th, 2012 AT 5:40 PM
Tiny
BILLTHURSTON
  • MEMBER
  • 9 POSTS
I just started getting this problem can someone send me the trouble shooting tree. Thanks. I have a 02 rodeo with a 3.2L
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Thursday, May 5th, 2016 AT 7:50 PM
Tiny
KAELO
  • MEMBER
  • 1 POST
I have same problem. I have a 3.2 200o model isuzu rodeo.
If enter a porthole the reduce power light comes on and I cant accelerate. The car just refuses to rev. I have to off the engine for 15 seconds then on it again to gain a rev
can I get the diagrams?
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Tuesday, September 5th, 2017 AT 7:41 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
I have updated this post the engine wiring diagrams are featured in the second post. Please check it out above. Please let us know if you need anything else to get the problem fixed.
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Wednesday, September 6th, 2017 AT 12:01 PM
Tiny
KDREWBELLA
  • MEMBER
  • 1 POST
  • 1999 ISUZU RODEO
  • 150,000 MILES
As we are putting the new fuel pump in we realized the new wire connect does not match the old. We just need to know where to reconnect the 4 color coded wires to the original chassis diagram. Please, the fuel tank it out.
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Monday, January 11th, 2021 AT 9:29 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
The wiring diagrams for the fuel pump are interrogated into the engine wiring and a guide to help you test the wiring.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Monday, January 11th, 2021 AT 9:29 AM (Merged)
Tiny
DSW422
  • MEMBER
  • 24 POSTS
  • 1995 ISUZU RODEO
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 118,000 MILES
I have a 1995 isuzu rodeo Ls 4wheel drive 3.2 V6. My fuel pump is having issues. I replaced it, but turns out there is some kind of short or something in the wiring. The wires read 12V when cranking, but not when in the on position. Even then, the pump doesnt turn on. I have tested the pump by hooking directly to the pump and it does work. I have also tested all relays and fuses which work. I am guessing the wires are broken somewhere, but idk. If I could get the wiring diagram for the fuel pump, it would be great. Thank you for the help.
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Monday, January 11th, 2021 AT 9:30 AM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Hello and thanks for donating

Below is the wiring diagram for the fuel pump that you asked for. Let me know if you need further assistance..


https://www.2carpros.com/forum/automotive_pictures/261618_Noname_2455.jpg

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Monday, January 11th, 2021 AT 9:30 AM (Merged)
Tiny
DSW422
  • MEMBER
  • 24 POSTS
Thanks for the help. But I was wondering if you could enlarge the picture so I can read it or tell me what the labels are. Also, a quick question. Is the fuel pump supposed to turn on when the vehicle is in the on position, or when cranking? Thank you for the help. I really appreciate it.
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Monday, January 11th, 2021 AT 9:30 AM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Sure, there are 2 wires at the fuel pump itself. A ground wire, black, and a power wire, red, running to the relay. At the fuel pump relay there are 4 wires, a ground (black), a black/blue (turns to red near fuel pump for power), a pink/white that runs to the PCM and a black/yellow that goes to the fuse (#2, 15 amp).

As for the fuel pump, it should prime up when the key is turned to ON but will only stay on for around 4 seconds then kick back off. This is just the priming up for it, it knows it doesn't need to stay on with the key ON engine not running.
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Monday, January 11th, 2021 AT 9:30 AM (Merged)
Tiny
DSW422
  • MEMBER
  • 24 POSTS
Ok. Here is the problem. I get power to the pump only when the car is cranking but the pump doesnt turn on. And the pump does work. What may be the problem and where should I look for this problem. Thank you for all of the help.
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Monday, January 11th, 2021 AT 9:30 AM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Hmm, is definitely a wire issue somewhere then. You will need to take a test light and poke around the wiring I showed you. Make sure the pins that are labeled ground are actually groundingand not getting power somehow.
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Monday, January 11th, 2021 AT 9:30 AM (Merged)
Tiny
DSW422
  • MEMBER
  • 24 POSTS
Ok. Thank you for all of the help. Ill be sure to ask you again if I have any other questions. Again, thank you for the help.
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Monday, January 11th, 2021 AT 9:30 AM (Merged)
Tiny
HILLBILLY2009
  • MEMBER
  • 1 POST
  • 1992 ISUZU RODEO
Coil main wiring harness wires broke where do they attach?
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Monday, January 11th, 2021 AT 9:30 AM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

If this is not enough info let me know and i will try to get a better pic.

Mark (mhpautos)


https://www.2carpros.com/forum/automotive_pictures/61395_Noname_52.jpg

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Monday, January 11th, 2021 AT 9:30 AM (Merged)

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