Series 2 Plug & Play EMS
17
© 2021 AEM Performance Electronics
Not used
AEM EMS does not use this pin location for this application.
Connector A
Pin
AEM adapter harness pinout
(gray connectors wired to vehicle
wiring harness)
AEM EMS
30-6053
EMS I/O
EMS pin description
A1
--
Coolant dash
signal
Output
Available, provides coolant temperature gauge signal for Honda
instrument cluster
A2
Fuel pump
Low side 1
Output
PnP for fuel pump activation
A3
--
Low side 3
Output
Available, switched ground, 1.5A max
A4
VTEC stock computer oil pressure
switch
Low side 5
Output
PnP for VTEC oil pressure switch
A5
--
EGT 1
Input
Available, exhaust gas temperature sensor number 1,
jumper set for 0–5V input
A6
--
Low side 4
Output
Available, switched ground, 1.5A max
A7
--
Sensor ground
Output
Available, filtered ground for sensors
A8
--
Low side 12
Output
Available, switched ground, 1.5A max
A9
--
Vehicle Speed (T3)
Input
Available, vehicle speed sensor (connected to C23)
A10
--
Injector 12
Output
Available, pulse width modulated switched ground, 1.5A max
A11
VTEC ground for stock computer
Filtered ground
Output
Dedicated, used to emulate the VTEC solenoid
A12
--
Injector 9
Output
Available, pulse width modulated switched ground, 1.5A max
A13
--
Coil 7
Output
Available, 0–5V falling edge signal
(only available for use with 3-wire smart coils)
A14
--
Injector 11
Output
Available, pulse width modulated switched ground, 1.5A max
A15
--
Low side 11
Output
Available, switched ground, 1.5A max (connected to A16)
A16
--
Low side 11
Output
Available, switched ground, 1.5A max (connected to A15)
A17
--
Low side 6
Output
Available, switched ground, 1.5A max
A18
--
Low side 10
Output
Available, switched ground, 1.5A max
A19
--
Low side 7
Output
Available, switched ground, 1.5A max
A20
Radiator fan control
Low side 8
Output
PnP for radiator fan control (cannot be set higher than stock
ECU temperature of 95°F/35°C unless tapped wire at stock
ECU is disconnected)
A21
--
+12V power
Output
Available, fi12V power
A22
--
Coil 8
Output
Available, 0–5V falling edge signal
(only available for use with 3-wire smart coils)
A23
--
O2 #2
Input
Available, 0–5V air-fuel ratio sensor number 2 signal
A24
--
+12V start signal
Input
Not used
A25
--
Idle 3
Output
Available, switched ground, 1.5A max
A26
--
Switch 5
Input
Available, switched ground input signal number 5
A27
--
Switch 6
Input
Available, switched ground input signal number 5
A28
--
Idle 2
Output
Available, sw12V power, 1.5A max
A29
--
MAF
Input
Available, 0–5V mass air flow sensor signal
A30
--
EGT 3
Input
Available, exhaust gas temperature sensor number 3,
jumper set for 0–5V input
A31
--
Sensor ground
Output
Available, filtered ground for sensors
A32
--
Switch 1
Input
Available, switched ground input signal number 1
