DIAGNOSTIC MANUAL
4.7. GRAPH 7: LOW EXHAUST GAS TEMPERATURES (RESTRICTED AFI)
NOTE – Snapshot recorded below with Diesel Particulate Filter (DPF) soot load level 1.
1. Diesel Oxidation Catalyst Inlet
Temperature (DOCIT) (degrees
Fahrenheit) [Blue]
2. Diesel Particulate Filter Inlet
Temperature (DPFIT) (degrees
Fahrenheit) [Orange]
3. Diesel Particulate Filter Outlet
Temperature (DPFOT) (degrees
Fahrenheit) [Green]
Figure 11
Graph 7: Low Exhaust Gas Temperatures (Restricted AFI)
Graph Analysis:
This graph shows low exhaust gas temperatures indicating a restricted Aftertreatment Fuel Injector (AFI). Low
temperatures in the exhaust stream occur when fuel flow from the AFI is restricted, resulting in less fuel burning
in the exhaust stream. This test does not give pass or fail results. It only allows the user to validate operation
of the aftertreatment system by monitoring exhaust gas temperatures.
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