SECTION 04: EXHAUST AND AFTERTREATMENT SYSTEM
PA1593
9
CAUTION
Tighten clamps properly in order to prevent
any movement of the diffuser assembly. An
impact wrench is necessary.
1. Loosen the clamp securing the diffuser
assembly to the catalytic converter.
FIGURE 7: DIFFUSER POSITION ADJUSTMENT 04015_1
2. For proper angular position, make sure that
the two edges shown on figure 7 are parallel
with each other.
3. Using a straightedge, adjust the diffuser
assembly level. The top surface of the
warning plate fixed on the diffuser louvered
cover must be flush with the roof surface or
may exceed about 3/32".
4. Tighten the clamp securing the diffuser
assembly to the catalytic converter.
5. Reinstall the exhaust aftertreatment system
roof ventilation grill and deflector.
4.2 MAINTENANCE
At vehicle inspection intervals, inspect the
diffuser assembly as follows:
Inspect diffuser grille for stress cracking;
Check for presence of foreign matter and
debris inside the diffuser housing, remove
and clean if applicable;
Check for proper functioning of the rain cap
inside the diffuser housing, make sure that it
moves freely;
Make sure that the water drain tube is not
clogged. Pour a cup of water into the diffuser
housing and assure that all the water is
drained at once at the other end of the drain
tube. If tube is clogged, remove tube and
blow compressed air inside in reverse flow;
Check that the warning plate
”THIS DIFFUSER
SURFACE MUST BE FLUSH WITH THE ROOF
SURFACE”
is still in place.
5. DIESEL EXHAUST FLUID (DEF) TANK
AND INJECTION SYSTEM
The DEF tank and injection system control unit
continuously vary the amount of DEF injected in
response to the engine’s current load conditions.
Diesel Exhaust Fluid (DEF) is stored in a 16
gallons plastic tank located aft of the condenser
compartment.
FIGURE 8: DEF TANK AND PUMP LOCATION
A pump located beside the DEF tank is used to
pressurize the system and deliver the fluid.
A heating coil located inside the tank use engine
coolant to keep the DEF warm during cold
season.
DEF is injected into the exhaust gases through
an injection nozzle located between the DPF
and the catalytic converter (refer to figure 1).
In the catalytic converter, nitrogen oxides are
transformed into harmless nitrogen gas and
water.
The system notifies the driver when it is time to
top up with DEF.
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