Aisan Throttle Body Tacoma 4Runner 4 Runner Tundra 2002-2004 - YotaTech Forums



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Aisan Throttle Body Tacoma 4Runner 4 Runner Tundra 2002-2004

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Old 10-06-2017, 06:57 PM   #1
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Aisan Throttle Body Tacoma 4Runner 4 Runner Tundra 2002-2004

Manufacturer Aisan
Throttle body part Number: W0133-1742371

2001 4runner had P1125 trouble code. Errors were from a failing throttle position sensor that was no longer available from Toyota. After trying three different 4 prong TPS I gave up and lived with the issue, motor stumbling.

Today, I received a throttle body from Ebay. Cost, was about $800 including shipping and a 30 day warranty. Near $300 savings compared to dealers. Within 2 minutes the computer learned idle. I'll update if there is a problem in the next month.
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Old 10-08-2017, 11:26 AM   #2
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There was a very brief (less than 2 seconds) hesitation. No "check engine" light or trouble codes were produced.
Happened after I filled up with gasoline. Drove again with no issues. Perhaps it's the winter gasoline mix.
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Old 10-09-2017, 04:42 PM   #3
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Hesitation from 20 to 55 mph. Trouble code P1125. Engine light was briefly on.
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Old 10-09-2017, 06:46 PM   #4
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2001 4runner doesn't have a pedal sensor. The throttle body is controlled by cable. Also P1125 is for throttle control motor. 2001 4runner doesn't have that either.
The problem is the connection from the throttle position sensor on the throttle body to the ECU. There are 4 wires as seen in the diagram provided by EatonKyleH
at http://www.toyota-4runner.org.


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Old 10-11-2017, 06:45 PM   #5
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Two days and no hesitation no new trouble codes since I used dielectric grease on the throttle body sensor connectors.
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Old 10-12-2017, 11:43 AM   #6
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Good work on the troubleshooting. Was about to say its likely electrical. These engines are due for all sorts of electrical contact cleanings it seems. Makes sense to do first before replacing what could otherwise be a still viable unit.
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Old 10-15-2017, 12:33 PM   #7
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Autumn drive didn't go well.

Engine light blinked several times with no code.

Engine stumbled at various speeds. UNTIL, giving it
3/4 pedal. Then..

VSC/OFF VSC/TRAC and engine light illuminated.
Trouble code P1125 reappeared.

Now, throttle has a sour spot about 1/3 pedal distance.
Deactivating OD makes the 4runner stutter less.

Also heard, what might be a relay clicking under the dash during
some off of the engine stuttering.

.. check voltage from TPS during throttle.
.. check ECU connector
.. check cold idle, it was too high 1,500 RPM.
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Old 10-15-2017, 09:45 PM   #8
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Quote:
Originally Posted by amusement View Post
2001 4runner doesn't have a pedal sensor. The throttle body is controlled by cable. Also P1125 is for throttle control motor. 2001 4runner doesn't have that either.
The problem is the connection from the throttle position sensor on the throttle body to the ECU. There are 4 wires as seen in the diagram provided by EatonKyleH
at http://www.toyota-4runner.org.



I think you misunderstood. The 2001 4Runner 5VZ-FE IS throttle-by-wire; it does have a pedal sensor, and it does have a throttle control motor. The cable referred to in the FSM excerpt is a "limp-home" back-up that is only used when the ECU senses a fail and shuts down the throttle by wire. You can confirm this by flooring the accelerator with the key off. The cable will only open the butterfly partially. On a non-TBW 5VZ-FE, such as on 1999-2000 4Runners, the butterfly will open fully doing the same thing. The 2001-2002 TBW needs the throttle motor in action to fully open the butterfly.

Last edited by TheDurk; 10-15-2017 at 09:54 PM.
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Old 10-16-2017, 03:59 PM   #9
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Thumbs up Battery ground was a little loose

Quote:
Originally Posted by TheDurk View Post
I think you misunderstood. The 2001 4Runner 5VZ-FE IS throttle-by-wire; it does have a pedal sensor, and it does have a throttle control motor. The cable referred to in the FSM excerpt is a "limp-home" back-up that is only used when the ECU senses a fail and shuts down the throttle by wire. You can confirm this by flooring the accelerator with the key off. The cable will only open the butterfly partially. On a non-TBW 5VZ-FE, such as on 1999-2000 4Runners, the butterfly will open fully doing the same thing. The 2001-2002 TBW needs the throttle motor in action to fully open the butterfly.
Thanks Durk!

Validated drive by wire with cable backup.
Validated throttle motor, used ohm meter and it comes really close to my old one.
Checked the throttle motor connector and pins. Applied dielectric grease.

Battery ground was a little loose. Snugged it up.

Ordered ODBII device to link to my laptop for data logging.
Will revisit this when I have a log to show.
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