AEM 30-2340 4-Channel Wideband UEGO AFR Controller - Manual (Page 14)

Page 14 10-2340 Rev 05 121012
EXHAUST BACK PRESSURE COMPENSATION
(OPTIONAL): MUST BE USED WHEN MOUNTING
UEGO SENSORS PRE-TURBO
UEGO sensors are extremely sensitive to pressure. Without an EBP kit (30-2064),
UEGO sensors mounted before the turbocharger will give inaccurate AFR readings due
to back pressure. When the EBP kit is installed correctly, the 4 CH UEGO controller will
output accurate AFR readings. UNDER NO CIRCUMSTANCES SHOULD UEGO
SENSORS BE MOUNTED PRE-TURBO WITHOUT USING THE EBP KIT.
When using multiple 4 Channel UEGO controllers on twin turbo or dual bank engines, it
is recommended that an EBP kit is used for each controller as back pressure levels can
vary per bank. When using multiple 4 Channel UEGO controllers on single turbo
engines, such as an inline 6, it is possible to share a single EBP source. To share a
single EBP source between multiple controllers, the green and black EBP wires for each
controller must be tied together as shown in Figures 12 and 13. Use extreme caution
when modifying the harness as improper connections may result in inaccurate AFR
readings. Be sure to cover all connections with moisture resistant heat shrink or
equivalent covering.
Figure 12. EBP Sensor Connector Figure 13. Cut & Spliced Wires
INDICATOR LIGHTS
The AEM 4 CH UEGO controller has eight indicator LEDs, one Status and one Ready
LED for each channel (Figure 14). Both Ready and Status LEDs flash during sensor
warm up. Once the UEGO sensor reaches operating temperature, usually within 30
seconds, the Status LED will turn off and the Ready LED will remain on solid. If a
UEGO sensor error is detected, analog output will switch to approximately +5V and both
LEDs will flash. The Status LED will flash on and off a number of times, followed by a
short pause, signifying an error code. The error codes are listed below in Table 4.