90GTS4
Junior Member
So, I almost have my dad's truck ready for emissions and only have this code left (U11E9 for the Active Grill Shutter). I have attempted to perform some wire troubleshooting and have had some good results and others that are questionable and I will list them below
Connector at the AGS:
- Pin 1 (black): good continuity to ground (~0.4 Ohms)
- Pin 2 (white/brown): questionable 4 VDC with no keys in ignition, ~2 VDC with keys in and turned but not started
- Pin 3 (red): good 12 VDC
I went to the PCM and attempted to shoot pin 55 on it (the connector towards the driver's side) to pin 2 on the AGS and got anywhere from 600K ohms to 8M ohms, which is essentially open and part of my questionable results. I also shot power out of pin 55 (probed the back of the connector) and got a solid 12 VDC with no keys in and ~10 VDC with keys in and turned but no ignition on (which seems to be right, I believe). I also cut back the wrapping of the harness for the AGS connector until it merged with the main harness and found zero wiring that looked damaged (that seemed to be what most people dealt with, but of course, not me).
My questions are as follows:
1. Is pin 2 (AGS) to pin 55 (PCM) supposed to be straight continuity (~0.5 ohms or so) or is it going through something else causing those weird readings?
2. Could I splice in a new wire to essentially bypass whatever is causing this "open"?
3. If not, is it possible to rig something up to get rid of the code/light to get it to pass emissions (CEL is an auto fail no matter what)? Perhaps spicing 12 VDC into pin 2 and remove the shutters so I never have to worry about them closing?
Thank you for any help with this!
Connector at the AGS:
- Pin 1 (black): good continuity to ground (~0.4 Ohms)
- Pin 2 (white/brown): questionable 4 VDC with no keys in ignition, ~2 VDC with keys in and turned but not started
- Pin 3 (red): good 12 VDC
I went to the PCM and attempted to shoot pin 55 on it (the connector towards the driver's side) to pin 2 on the AGS and got anywhere from 600K ohms to 8M ohms, which is essentially open and part of my questionable results. I also shot power out of pin 55 (probed the back of the connector) and got a solid 12 VDC with no keys in and ~10 VDC with keys in and turned but no ignition on (which seems to be right, I believe). I also cut back the wrapping of the harness for the AGS connector until it merged with the main harness and found zero wiring that looked damaged (that seemed to be what most people dealt with, but of course, not me).
My questions are as follows:
1. Is pin 2 (AGS) to pin 55 (PCM) supposed to be straight continuity (~0.5 ohms or so) or is it going through something else causing those weird readings?
2. Could I splice in a new wire to essentially bypass whatever is causing this "open"?
3. If not, is it possible to rig something up to get rid of the code/light to get it to pass emissions (CEL is an auto fail no matter what)? Perhaps spicing 12 VDC into pin 2 and remove the shutters so I never have to worry about them closing?
Thank you for any help with this!