Okey guys, here we go again.....

I recently did some diagnosis with the car's OBDI. I followed the procedure as per the FAQ. Test mode 1 on the socket 2 and 6 were fine the codes on both sockets on each three attempt were 1-1-1.

However when I did the test mode 2 under socket #2, I did not see the 3-3-3 (throttle full load position), only the 3-3-2 code (throttle position okey). Tried few times moving the throttle spool and hold it up or play with it but no luck. The other thing is that when I switch on/off the A/C no codes was displayed (i.e 1-1-4) nor the 1-3-4 (AC compressor start okey code). The temp. control unit in the car is automatic unit also known as the ECC. I did the diagnosis on the ECC itself and the light around the A/C on/off switch displayed 1-6-1. After flashing a light on the light sensor on the dash it displayed 1-1-1.

Also absent is code 1-2-4 (when the auto trans. shifter is shifted from P to D and to N). I suspect that something is wrong somewhere and thats why there are no codes for the above tests which indirectly affecting the idling of the car.

Test mode 3 - no problem. The parts did all the self test it supposed to do.

So can somebody let me know why the 3-3-3, 1-1-4, 1-3-4 and 1-2-4 codes are absent? Where are the parts that suppose to send these signals and how can I test them with my test meter? Any help is greatly appreciated. This has been happening for almost two years now and I don't want to post the same post two years down the line.

thanks

velan

volvo940GLE, 16 valve, 1991, Kuala Lumpur, Malaysia.