SECTION 04 : EXHAUST AND AFTERTREATMENT
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual Section 04 revised March 2021
FIGURE 19
7. Install filter cover. Torque to prescribed
torque.
TORQUE: 16.5 lb-ft (22 Nm)
FIGURE 20
CAUTION
Check if there are cracks around the area of
the filter cover. No cracks in the material are
allowed.
MAINTENANCE
Replace DEF pump filter element and
equalizer
at the intervals specified by the
Lubrication & Servicing Schedule in Section
24A.
8. AFTERTREATMENT HYDROCARBON
DOSER
Proper functioning of the aftertreatment
hydrocarbon doser a.k.a. aftertreatment
hydrocarbon injector (AHI) is required in order to
obtain efficient regeneration process of the DPF.
Clogged aftertreatment hydrocarbon doser will
result in clogged DPF.
In addition to the activation of the CHECK
telltale, emission of diagnostic troubleshooting
codes (DTC) by the engine ECM (MID128) will
indicate malfunction of the aftertreatment system
and/or aftertreatment hydrocarbon doser. DTC
may be accessed through the Driver Information
Display. Select DIAGNOSTICS menu then
FAULT DIAGNOSTICS and ENGINE ECU
submenus.
Check status of the aftertreatment system
through the Driver Information Display. Select
AFTERTREATMENT menu then ATS STATUS.
Then check the DPF soot level with SOOT
LEVEL GAUGE.
MAINTENANCE
Aftertreatment hydrocarbon doser
Replace the aftertreatment hydrocarbon doser
at the intervals specified in
LUBRICATION & SERVICING SCHEDULE.
8.1. REPLACEMENT
1. Remove fastener and p-clamp securing the
line to the mounting bracket on the diffuser
pipe.
WARNING
Fuel leaked or spilled onto hot surfaces or
electrical components can cause a fire and
result in component damage and serious
personal injury.
2. Disconnect the line from the aftertreatment
hydrocarbon injector fitting. Collect any
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