TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
FLASH CODE:
28
DDR DISPLAY:
AIR TEMP SENSOR INPUT VOLTAGE LOW
SAE J1587 CODE:
PID: 172 FMI: 4
Indicates that the engine Air Temperature Sensor (ATS) input to the ECM has dropped below 5% (normally < 0.25
volts) of the sensor supply voltage. This diagnostic condition is typically:
(1)
sensor signal circuit is shorted to sensor return
(2)
sensor signal circuit is shorted to ground
FLASH CODE:
31
DDR DISPLAY:
ENG BRK LOW OPEN CIRCUIT
SAE J1587 CODE:
SID: 51 FMI: 3
Indicates that the Engine Brake Low function assigned to the Auxiliary Output #3 circuit is open or is shorted to
battery (+). This diagnostic condition is detected when Engine Brake Low driver is OFF and the DDEC III ECM
measures a high voltage on the circuit output.
FLASH CODE:
31
DDR DISPLAY:
ENG BRK LOW SHORT TO GROUND
SAE J1587 CODE:
SID: 51 FMI: 4
Indicates that the Engine Brake Low function assigned to the Auxiliary Output #3 circuit is shorted to ground. This
diagnostic condition is detected when the DDEC III ECM is unsuccessful in turning ON the Engine Brake Low driver
output.
NOTE:
The Engine Brake Low output is a high side driver which means that the DDEC III
ECM supplies battery (+) to the engine brake low circuit to turn ON the function.
FLASH CODE:
31
DDR DISPLAY:
ENG BRK MED OPEN CIRCUIT
SAE J1587 CODE:
SID: 52 FMI: 3
Indicates that the Engine Brake Medium function assigned to the Auxiliary Output #4 circuit is open or is shorted to
battery (+). This diagnostic condition is detected when the Engine Brake Medium driver is OFF and the DDEC III
ECM measures a high voltage on the circuit output.
FLASH CODE:
31
DDR DISPLAY:
ENG BRK MED SHORT TO GROUND
SAE J1587 CODE:
SID: 52 FMI: 4
Indicates that the Engine Brake Medium function assigned to the Auxiliary Output #4 circuit is shorted to ground.
This diagnostic condition is detected when the DDEC III ECM is unsuccessful in turning ON the Engine Brake
Medium driver output.
NOTE: The Engine Brake Medium output is a high side driver which means that the DDEC III ECM supplies battery
(+) to the engine brake low circuit to turn ON the function
Change 3 3-345.23
