TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS (Cont’d.)
Code 25 No Codes - No faults have been detected by DDEC-II since the last time the codes were cleared
Code 31 Fault on auxiliary output: one of the following faults has been detected for more than 2 seconds:
l Open in "Check Engine" of "Stop Engine" Light circuit. or
l Short to ground in "Check Engine". "Stop Engine". Light circuits or in the Crank Position, Engine
Brake or one of three auxiliary drive (Iabelled PWM or AUX) circuits. Battery voltage at the ECM must also
be greater than 8 volts.
Code 32 ECM Failure - The backup system inside the ECM has failed
Code 33 Turbo Boost Sensor (TBS) - Engine running (at less than 800 RPM or less than 30% of maximum torque) for 5
seconds with too high a voltage at the TBS input to the ECM
Code 34 Turbo Boost Sensor (TBS) - Engine running for 2 seconds with too low a voltage at the TBS input to the ECM.
Code 35 Oil Pressure Sensor (OPS) - Engine running for 2 seconds at less than 800 RPM with too high a voltage at the
OPS input to the ECM. Oil or coolant temperature must be greater than 50 degrees C to log This code.
Code 36 Oil Pressure Sensor (OPS) - Engine running for 2 seconds with too low a voltage at the OPS input to the ECM.
Code 37 Fuel Pressure Sensor (FPS) - Engine running for 2 seconds with too high a voltage at the FPS input to the ECM.
Code 38 Fuel Pressure Sensor (FPS) - Engine running for 2 seconds with too low a voltage at the FPS input to the ECM.
Code 43 Low Coolant - System running with low coolant for 7 seconds. Battery voltage at the ECM must also be greater
than 11 volts. This fault will cause both the “Stop Engine and “Check Engine” lights to turn on.
Code 44 Oil or Coolant Over Temperature - System running for 2 seconds with the oil or coolant temperature greater
than a calibrated limit. This fault will cause both the "Stop Engine" and "Check Engine" lights to turn on, and
will power down (and eventually shutdown) the engine if the engine protection system is equipped with the
shutdown feature. (NOTE: if the oil or coolant IS only slightly overtemperature. the following occurs: the “’Check
Engine" light comes on after 2 seconds and a code is logged.
Code 45 Low Oil Pressure - Engine running with the oil pressure less than the limit (different limits at different RPM's) for
7 seconds. This fault will cause both the “Stop Engine" and "Check Engine" lights to turn on.
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