MSD 2910 Atomic EFI Master Kit Installation User Manual
Page 7
INSTALLATION INSTRUCTIONS
7
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WIRING
There are several wires and connectors on the throttle body. Not all of these wires will be connected on
every application. Following is a chart of each wire.
REQ. / OPT. Wire Color Description
REQ
Yellow
This connects to the Engine Coolant Temperature Sensor.
Black
REQ White This is the tach input wire for the EFI responsible for triggering the system.
It connects to the tach output of an MSD Ignition Control or Ready-to-Run
Distributor. It can also be connected to the coil negative terminal when
using a stock type ignition such as points or a GM HEI distributor. Note:
This wire is not used when the magnetic pickup wire is being used
for ignition timing.
OPTIONAL Yellow
This is a tach
output wire. Connect this wire to the White points input
wire on an MSD ignition unit
only when using the Atomic to control
timing. If the Atomic is not controlling timing this wire can be used as
a 12 volt square wave trigger to a tachometer.
OPTIONAL Orange
This is an AC kick-up wire. When 12 volts are supplied to this wire
it will provide a small rpm "kick-up" in the idle to compesate for an
added load to the engine from the air conditioner compressor. It will
also activate the primary cooling fan (when two are used).
OPTIONAL Violet (+)
This is the input for a magnetic pickup, such as from an MSD distributor.
This connector is
only used when the Atomic is controlling ignition
timing.
REQ
CAN-Bus
The 6-pin connector must connect to the Power Module. Do NOT
cut this harness. MSD offers extensions in 2, 4 and 6-feet lengths if
needed.
used with
timing
control
used with
A/C
used with
timing
control
Green (–)
EXTERNAL SENSORS
There are only two external sensors that need to be installed and connected; the Wide Band Oxygen
Sensor and the Engine Coolant Temperature Sensor. (Both are supplied.) The Wide Band Oxygen
Sensor installation is covered on page 5.
The coolant sensor is a variable resistance sensor and needs to be installed in the engine.
1. Find a location for the coolant temperature sensor. Many engines have provisions on the cylinder
heads or the intake manifold.
2. It is recommended to use a small amount of Teflon tape or sealer on the threads.
3. Locate the 2-pin coolant sensor wiring harness. Route and connect the harness to the coolant
temperature sensor.