Unicarriers (& Nissan) MP1F2A25LV:
no acceleration

had a code e-23 and e-31. after reading comments about these codes and checking wiring, relays and fuses, i replaced the throttle chamber assy. now it starts but no acceleration. i cant clear codes with a obd2 or the pedal dance. any suggestions?
  • Posted 29 Oct 2018 09:21
  • Discussion started by bf53
  • Nebraska, United States
Showing items 1 - 4 of 4 results.
thanks alot.i will try it in the morning.
  • Posted 30 Oct 2018 11:46
  • Reply by bf53
  • Nebraska, United States
As with any nissan Tier II and above engine control system the throttle valve and accelerator learning has to be done along with the air idle volume learning.

This is the caterpillar learning methods
Nissan may be the same, if not then you will need to get the proceedure out of the Nissan service manual.

To do the throttle valve closed position learning all you do is turn on the key (do not start the engine), then turn it off. Wait 5 seconds.
Make sure the throttle moves, you should hear it buzzing when it is learning, just a couple seconds. When it is complete it will stop.

Accelerator pedal position released position learning:
-turn ignition on and wait 2 seconds
- turn ignition off, wait 10 seconds
-turn ignition on and wait 2 seconds.

The air idle volume learning is done as follows:
(This has to be done with the service tool or pc program)
this will not keep the engine from accelerating though.
  • Posted 30 Oct 2018 10:52
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
do i need the laptop for this? i dont have access to this.
  • Posted 30 Oct 2018 00:35
  • Reply by bf53
  • Nebraska, United States
sounds like you need to do a throttle body relearn
this is a normal proceedure after replacing the throttle body.
It is also recommended to do an idle air volume learn as well.
  • Posted 29 Oct 2018 23:04
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com

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