INSTALLATION INSTRUCTIONS 11
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DIAGNOSTICS (FIGURE 13)
The Atomic TCM provides some basic diagnostics codes that are useful for troubleshooting purposes.
The status of each associated parameter can be shown in one of three ways.
• “OK”:theparametervalueiswithinitsnormalrange
• “ErrorC”:theparameteriscurrentlyout-of-range
• “ErrorH”:Theparameterexperiencedanout-of-rangeconditionatsomepointwithinthelast10
key-on/off cycles
CLEARING DIAGNOSTIC ERRORS
CODE NAME
TPS CAL
WHAT IT MEANS
The controller has detected a TPS
value that exceeds the minimum/
maximum values after the TPS
calibration.
PROBABLE CORRECTION(S)
This code will set if throttle linkage was not fully seated
against the idle stop, or fully depressed to Wide Open
Throttle (WOT) during the initial TPS calibration and
exceeds the calibration window. Repeat the TPS
calibration procedure ensuring the full range of throttle
stop travel is utilized. A faulty TPS sensor may also
cause this code to set if the voltage drifts over time. TPS
replacement and re-calibration may be required.
TPS SPAN The controller has detected TPS
value that is outside the lower/upper
voltage window.
This code will set if the Throttle Position Sensor (TPS)
is operating beyond the normal 0-0.5V window at an
idle or 4.5-5V in the WOT range. Re-indexing of the
TPS mounting position or sensor replacement may be
required.
TPS CIRCUIT The controller has detected a short
in the TPS circuit, or an open TPS
circuit.
This code will set if the Yellow TPS sensor wire is shorted
to ground, +5VDC power, or if no TPS is detected. Check
the routing and condition of the Orange, Black and Yellow
wires in the auxiliary harness; and/or replace TPS.
TFT MAX The Transmission Fluid Temperature
(TFT) has exceeded 266°F for more
than one minute.
This code will set if operating conditions are such that
excessive heat is being generated while the transmission
is operating. Occasional appearance of this code is normal
while towing heavy loads on steep grades with the Torque
Converter Clutch (TCC) unlocked. Regular appearance of
this code under normal operating conditions may indicate
excessive internal slippage, excessive line pressure, or
inadequate transmission fluid cooling.
TFT CIRCUIT The controller has detected a short
or an open in the Transmission Fluid
Temperature (TFT) circuit.
This code will set if there is a break or a short in the
Violet or Green TFT sensor wires, or if the TFT sensor is
defective. Check the routing and condition of the wires,
and/or replace the TFT sensor.
RANGE ERR The controller was unable to
determine a valid shifter position for
more than one second.
This code will set if there is a problem with the transmission
range indicator switch, or the main transmission harness.
If applicable, execute OEM procedures for indexing
external tranmission range switches. Check the condition
and routing of all main harness wires and connectors,
and/or replace range switch.
EEPROM ERR The controller has detected a
problem with its internal Electronically
Erasable Programmable Read-Only
Memory (EEPROM).
This code will set if an internal problem prevents EEPROM
interrogation when the unit is powered on. Return the unit
to MSD for testing or replacement.
SYS VOLT LO The controller has detected a system
voltage below 10.5 VDC for more
than 5 seconds.
Ensure that the battery is fully charged, the alternator is
working properly, and there are no large parasitic loads
on the main electrical system. Check the controller wiring
and ensure that the 14-gauge Red and Black wires
are connected directly to battery power, and that the
Pink ignition wire has at least 12VDC applied when the
controller is operating.
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