AEM 30-6310 Series 2 Plug & Play EMS User Manual
Page 8
Page 8 of 15
EVO8 Fan Control:
The EVO8 has two fans: the A/C Condenser fan and the Radiator fan.
The A/C Condenser fan is mounted in front of the A/C condenser (near front bumper
opening). There are two control relays in the factory wiring harness that can change the
speed of the A/C condenser fan. When the INJ12 output (pin 34) is ON but the IDLE5
output (pin 32) is OFF, the fan will run at low speed. When both the INJ12 (pin 34) and
IDLE5 (pin 32) are ON, the fan will run at high speed. Note that the A/C condenser fan will
also force air through the radiator.
The Cooling Fan is mounted behind the radiator (near the turbocharger). There is a Fan
Control Module that can change the speed of the Cooling Fan. The LS2 output (pin 21) of
the EMS sends a pulse-width modulated signal of various duty cycles to the Fan Control
Module to request various fan speeds. The start-up calibration uses User PW table to
control the duty cycle of the LS2 output. The ‘User PW Analog In’ option will define the x-
axis of the table; this is set to Coolant Volts in the start-up calibration.
Please use the following reference chart when making adjustments to the User PW table:
Temp (deg C)
Temp (deg F)
User 1 in (Coolant Volts %)
Notes
127
261
0.0
90% duty cycle (high fan speed)
127
261
6.3
90% duty cycle (high fan speed)
127
261
12.5
90% duty cycle (high fan speed)
109
228
18.8
90% duty cycle (high fan speed)
92
198
25.0
60% duty cycle (med fan speed)
79
172
31.3
10% duty cycle (low fan speed)
68
154
37.5
0% duty cycle (fan off)
60
140
43.8
0% duty cycle (fan off)
53
127
50.0
0% duty cycle (fan off)
46
115
56.3
0% duty cycle (fan off)
39
102
62.5
0% duty cycle (fan off)
33
91
68.8
0% duty cycle (fan off)
25
77
75.0
0% duty cycle (fan off)
14
57
81.3
0% duty cycle (fan off)
2
36
87.5
0% duty cycle (fan off)
-14
7
93.8
0% duty cycle (fan off)
-33
-27
100.0
0% duty cycle (fan off)