Other Potential Failure Modes - Carrier UG 15 Tier 4 Operation And Service Manual

Alarm Name
38 System Over Temp
44 Filter Outlet Temp
45 Exhaust Inlet Temp
53 ECM Output Failure
54 ECM Log Failure
55 ECM Clock Failure
62 ECM Temp Low
63 ECM Temp High
5.2

Other Potential Failure Modes

• Cracked filter substrate
• Blocked Doser, lack of fuel supply, Doser problems
• Ruptured DPF housing or broken exhaust piping
• Excessive fuel and lube oil consumption
Cause / Troubleshooting
Filter Outlet Temperature is more than 850°C during regeneration.
In some rare cases regeneration may produce higher than expected
temperatures leaving the DPF. This may be just after repairs with the back
pressure still high. This indicates that there is excess soot in the DPF. In these
cases, the EES will try to reduce temperatures by stopping fueling.
If temperatures still exceed desired values, the unit will temporarily shut down
to limit the burn rate of the soot.
After about 15 minutes the unit will restart and regeneration will continue if
needed.
Filter Outlet Temperature is less than -100°C or more than 1100°C at any
time.
Inspect the Filter Outlet Temperature Sensor (ESFOT). Refer to
3.6.3.
Check for exhaust leaks as this may indicate a leak in the system.
Replace if necessary.
Exhaust Inlet Temperature is less than -100°C or more than 1100°C at any
time.
Inspect the Exhaust Inlet Temperature Sensor (ESEIT). Refer to
3.6.1.
Replace if necessary.
ECM DO Current above 32A or output shorted to positive or negative supply
or DO output circuits temperature above 125°C for more than two seconds.
Check fuse F15.
Perform a manual regeneration. Refer to
Replace the ECM if no outputs become energized.
ECM is not able to log events.
ECM internal data logger has failed.
Replace the ECM.
ECM is not able to initialize.
ECM internal clock has failed.
Replace the ECM.
ECM Temperature is less than -43°C.
ECM internal temperature is below the accuracy threshold for the device.
Allow the ECM to warm up.
If alarm is not cleared after ECM is warmed above -38°C, replace the ECM.
ECM Temperature is more than 125°C.
ECM internal temperature is above the accuracy threshold for the device.
Allow the ECM to cool.
If alarm is not cleared after ECM is cooled below 120°C, replace the ECM.
5–3
Section
Section
Section 4.3.
T-378