89 Summit 1.5L

Does anyone know how to read the ECU diagnostic codes when the Check engine light is on?

Figured that out, check next post. Error Code is 15


Beto

Looks like no-one is responding. I will update as I go.

Oct 12
http://dmtalon.v8eaters.com/ecu_harness.html

and

http://www.dsm.org/archives/1998/09/19980907.txt/23.html

Oct 28
Found the diagnostic pin. Pin 1 on the connector in the link above.

1. Connected an LED from Pin 1 to a 1000 Ohm (1K) resistor and the other end of the resistor to ground. ( you can leave it there connected for next time)

2.Yep, got some flashing happening. Remember to disconnect the battery for 10 min to clear any faults that you created while messing around with connectors when the engine was running. I had all sorts of flashing but after the reset ( battery disconnect) I got just one Error 15. L-P-S-S-S-S-S
The second link above said it was Error 15.

3. Now how do I find it.

4. OK checked all the temp sensors. Nope look OK

5. Checked the Idle motor. Removed it. Connected +12 V to the 2 terminals on top. Motor turned one way. Flipped connection motor turned the opposite way ( actually I pulled it apart first) . Check the idle motor position sensor. Its just next to motor on the same metal bracket. Pins 1-2 on the 5 pin connector change resistance up and down as the idle motor pushes the piston in and out. Looks Ok, I think. Not sure what the other 3 pins do.

Still going. Nothing found yet.

Oh I also checked the throttle position sensor.

throttle closed throttle open
Pins 1-2 1.0K 4.64K
Pins 1-3 4.39K 4.39K

Any help would be great :-(

Still have not found the problem.

Wow I thought there would be someone that knows something out there.
Looks like I'm on my own.

I hit paydirt as far as manuals. Here is a link to an ru site with a service manual for something similar from Mitsubishi.

http://pdf.pajero4x4.ru/93%20Aftermarket%20Service%20Manuals/

scoll down to
tests with codes.pdf


beto