I just got through testing my AEM Gauge and Sensor as the AEM tech described to me since I was having an issue on the dyno the other day. This procedure may work for some other widebands (providing you have the voltage scale tables) but as stated above I did it with my AEM UEGO 6/1 setup.
To test the gauge to see if it is working correctly:
Unplug the sensor at the lock connector. Turn iIGN on but don't start the car. Gauge defaults to 14.7(8) in test mode. Measure the voltage on the white wire (output) to ground. It should be around 2.375 VDC. If this is the case then your gauge is working correctly. It should be noted that I am in the P0 mode (for gasoline/AFR readings).
To test the sensor:
Take sensor out of downpipe and lay on top of cold engine (sensor should be plugged back in at this point). Turn on IGN but don't start the car. After a few seconds, your gauge should read maximum lean condition (>18 or --- on the scale).
Next test for richness calibration. Put some acetone in a rag and put sensor tip on this. Don't immerse sensor tip in the acetone, just set it on the saturated rag. Turn on IGN but don't start the car. After a few seconds, the heated tip of the sensor will start to evaporate the acetone and you should get a maximum rich reading on your gauge (<10 or ---).
If all the above test pass, then you have either a wiring problem or another possible mechanical issue.
Also note that your voltage will read different if you are using a different mode on your gauge other than P0.
These voltages are:
P0 = 2.375
P1 = 2.375
P2 = 1.475
P3 = 0.238
P4 = 0.410
Hope this helps somebody.
To test the gauge to see if it is working correctly:
Unplug the sensor at the lock connector. Turn iIGN on but don't start the car. Gauge defaults to 14.7(8) in test mode. Measure the voltage on the white wire (output) to ground. It should be around 2.375 VDC. If this is the case then your gauge is working correctly. It should be noted that I am in the P0 mode (for gasoline/AFR readings).
To test the sensor:
Take sensor out of downpipe and lay on top of cold engine (sensor should be plugged back in at this point). Turn on IGN but don't start the car. After a few seconds, your gauge should read maximum lean condition (>18 or --- on the scale).
Next test for richness calibration. Put some acetone in a rag and put sensor tip on this. Don't immerse sensor tip in the acetone, just set it on the saturated rag. Turn on IGN but don't start the car. After a few seconds, the heated tip of the sensor will start to evaporate the acetone and you should get a maximum rich reading on your gauge (<10 or ---).
If all the above test pass, then you have either a wiring problem or another possible mechanical issue.
Also note that your voltage will read different if you are using a different mode on your gauge other than P0.
These voltages are:
P0 = 2.375
P1 = 2.375
P2 = 1.475
P3 = 0.238
P4 = 0.410
Hope this helps somebody.
