Engine codes..plz help

[JetspeedCamry]

Checked the timing. Was at 14 degrees, becuase i set it to that!!
Checked the CEL codes. Found 2!!!
Code 24 - Intake Air Temp Sensor signal
* Intake Air Temp Sensor Circuit
* Intake Air Temp Sensor
* ECU
Code 31 - Air Flow Meter Signal
* Air Flow Meter Circuit
* Air Flow Meter
* ECU


I need some help on thse problems!! Like these error codes...how do i identify where the problem is. I know is gives areas to look at, but its a bit broad. What to a check/test?

88LE said that my IAT sensor was inside my AFM. So..if the trouble was with my AFM..then replacing it would fix both problems. Any idea's on how to test it?? I really don't want to buy a new one. And theres none around at wreckers either (unless its the same as another car?? 3sfe??)

This could also explain why my car runs soo well at night, but during the day it's 'hesitant'. Perhaps the warmer tempractures/thinner air duriing the day play havoc with the IAT sensor..not sure.

Anyways..help here would be greatly appreciated.
Thanks.

[88 LE]

Originally Posted by JetspeedCamry

88LE said that my IAT sensor was inside my AFM. So..if the trouble was with my AFM..then replacing it would fix both problems. Any idea's on how to test it??

Yup, the IAT sensor is within the AFM. If you look inside the AFM where the flapper (the metal plate that moves back/forth) is you'll see a white probe sticking out from the top of the AFM. That white probe is the IAT.

As far as testing goes, you can measure for resistance. Like I said in your other thread, I don't have the specs for a 2VZ-FE, but I do have the specs for a 3S-FE. Anyways the testing procedure should be the same.

The testing procedure won't help you much since you have a different engine, but I'll go through it anyways.


Heres the specs and troubleshooting info from a Toyota ewd (electrical wiring diagram) manual for a 3S-FE (88 Camry):

http://webs.lanset.com/trbocam/toyota/ecu/3.jpg

If you look under where it says "air flow meter", you'll see that 5-7 (pin 5 to pin 7) is the IAT. Notice how the resistance changes based on temp, this tells me its the measurements for the IAT.

You'll also notice that theres a capital "H" in a circle next to where it says "air flow meter". This means refer to plug "H".


This scan here shows the plug (H):

http://webs.lanset.com/trbocam/toyota/ecu/4.jpg


Its a 7 pin plug. What you see in the plug diagram is the wiring harness end of the plug. So the pin numbers on the AFM itself are reversed. IE: Pin 7 is on the left and pin 1 is on the right.

The resistance measurements are taken at the plug on the AFM, not the wiring harness end of the plug.

I really don't want to buy a new one. And theres none around at wreckers either (unless its the same as another car?? 3sfe??)

AFM from a 3S-FE will not work. Totally different engine.

[JetspeedCamry]

Thanks mate. Ill check it out today.