Installation Manual

20 INSTALLATION INSTRUCTIONS
MSD • WWW.MSDPERFORMANCE.COM • [phone] • FAX [phone]
DIAGNOSTICS
There is a self-diagnosing system built into the Atomic EFI. Each
covered parameter can show a status in one of three ways (Fig).
• “OK”:theparameterisfunctioningnormally.
• “ErrorC”:thereiscurrentlyanerroroccurring.
• “ErrorH”:Apreviouserrorthathasbeenresetsinceitdidnot
reoccur within the last ten ignition cycles.
Figure 35
CODE NAME
TPS
MAP
IAT
ECT
BATT
INJ DC
FUEL
PRESSURE
WBO2
FP CAV
MAP SELECT
BARO
WHAT IT MEANS
There is no reading for the Throttle Posi-
tion Sensor.
There is no reading for the Manifold Ab-
solute Pressure Sensor.
There is no reading for the Inlet Air Tem-
perature Sensor. The ECU will default
to 275°F when shorted or -40°F when
open.
There is no reading for the Engine Cool-
ant Temperature Sensor. he ECU will
default to 275°F when shorted or -40°F
when open.
The Atomic is receiving the wrong volt-
age. The unit is measuring either less
than 9 volts or greater than 16 volts.
Excessive Injector Duty Cycle
There is no reading for the Fuel Pressure
Sensor.
A. "NOT CONNECTED" indicates that no
sensor is detected.
B. "ERROR" indicates that the sensor
has failed.
This code will set if there is an issue with
Fuel Pump Cavitation (similar to vapor
lock). It can only set when running a
returnless fuel system. This may occur
when the commanded fuel pressure
(from the ECU) is different than the fuel
pressure (at the Fuel Pressure Sensor).
ECU compares the MAP reading with
the Baro reading on key up. If these are
different by more than 5kPa, the code
is activated.
The Baro sensor voltage is out of range,
and the ECU has defaulted to the last
known good Baro value.
PROBABLE CORRECTION(S)
The sensor may be at fault. Check wiring and/or replace sensor.
The sensor maybe at fault. Check wiring and/or replace sensor.
Faulty sensor; loose or no connection. Check wiring and/or re-
place sensor.
Faulty sensor; loose or no connection. Check wiring and/or re-
place sensor.
Check the battery connection from the Power Module to the
battery. Ensure that the battery and alternator are working cor-
rectly.
Ifyouarerunningareturnlessfuelsystemyourengine'sneeds
mayexceedtheAtomic'smaximumcapabilities.Ifyouarerun-
ning a return system check to see that you are maintaining the
recommended fuel pressure. If you have adequate fuel pres-
suretheengine'sneedsmayexceedinjectorowrate.
Faulty sensor; loose or no connection. Check wiring and/or re-
place sensor.
A. Check to see that the sensor is securely plugged into the
system. Inspect wiring if it is plugged into the system.
B. The sensor will need to be replaced.
Notethat'warmingup'isnormalduringstart-upfortherst20
seconds.
Check the fuel system and determine that it meets the
requirements to run a returnless (PWM) system. Check the filters,
the sock in the tank, and inspect the lines for any kinks or pinches
that would affect the fuel flow and pressure of the system. If the
code continues, the fuel system may need to be converted to an
in-tank fuel pump and/or regulated (return) fuel system.
Double check your MAP selection and make sure that you
selected the correct P/N of sensor. It could also mean a problem
with the Baro or MAP sensor itself (see above codes).
Turn the ignition off. Wait 10 seconds, and turn the ignition
back on. If the code remains, call customer service. Unless the
vehicle has been through a large change in altitude since the
last ignition on/off cycle (towed somewhere), everything will
function normally.