Fault code 15 and 25

[Turbo88]

Recently I have been driving my dad every day beater which is a 1986 Chrysler laser 2.5 N/A but I noticed the check engine light on so I decode it and find out what it is on mini mopar
- Fault code 15
No speed/distance signal = where do I find this problem

-Fault code 25
AIS (automatic Idle speed) Motor circuit shorted or target idle speed not reached.= and again were do i find this

Thanks
turbo88

[glht_omni]

the ais is on the throttle body near the tps (throttle position sensor) and the speed sensor is on the top of the trans on the driverside output shaft

[Turbo88]

Thanks Glht omni That helps me alot I'll let my dad know

Thanks again
Turbo88

[minimopar]

Just a wild guess: the speed sensor went out a while ago and the car kept stalling as a result. So, someone cranked the throttle stop screw in to bring up the idle speed to prevent the stall, thus the code 25. Does it idle kind of fast? You can reset the minimum air adjustment:

http://orion/minimopar/idleproblems.html#minairadjust

[Turbo88]

Quote:

Originally Posted by minimopar Just a wild guess: the speed sensor went out a while ago and the car kept stalling as a result. So, someone cranked the throttle stop screw in to bring up the idle speed to prevent the stall, thus the code 25. Does it idle kind of fast? You can reset the minimum air adjustment: http://orion/minimopar/idleproblems.html#minairadjust

No not really what's happening is its not idling at all it just idles 795rpms lets say when it supposed to be around 800ish rpm

[Turbo88]

so, lets say it has a bad Idle and that's what the codes are telling me when the car is cold it stall were i have to hold the accelerator and when its warm it just a "Blah" Rpm

[minimopar]

Well stalling when coming to a stop is typical for a bad speed sensor, but the code 25 is specifically calling-out the AIS in this case. I would try swapping it out for starters. You can test it by applying 12V across the terminals for a short duration only (pulse it). Connecting it one way will make it close. Swapping the terminals should made it open. If it is frozen, get another one. If you are so inclined, you can take it apart...just observe the orientation of the little gearset inside. Usually the motor shaft becomes corroded and seizes to the bushing. A little penetrating oil can sometimes revive it.

[minimopar]

Oops...just noticed this was N/A. You can't test it that way since it is a stepper motor. You can at least see if the pintle will move.

[Turbo88]

ok thanks for the info I'll try it

Thanks again