Installation Manual

Electrical & Electronic Application And Installation Manual
Production Release Version 1.0
Page 106
9.2 NOx Sensor
9.2.1 NOx Sensor Operation
There are two NOx sensors required for the Tier4 Final/Stage IV product
range. These sensors are required to correctly operate and monitor the
aftertreatment system. The sensing unit used in each operate in the same
way however to prevent incorrect harness connection the mating connections
have different keying.
Figure 9.5 NOx Sensor
The sensor requires connection to the ECM J1 connector and is supply
voltage dependent. Both 12 and 24V options are available. The sensor part
numbers supplied below take into account both the supply voltage
requirement and the Ampseal connector keying.
The position of the two NOx sensors will be dependent upon the engine range
they are fitted to and the aftertreatment arrangement. The table below
provides an overview of the NOx sensor position requirements for more
information please refer to Mechanical A&I manual.
Product & AT Arrangement
Engine
Out
NOx
Sensor
Position
Tailpipe Out
NOx
Sensor
Position
1206F On and Off engine
CEM
Mounting position for sensor
supplied post DPF.
To be mounted by customer
in machine tailpipe
1204F With DPF Sensor requires mounting
post DPF within customers
pipe work from DPF to SCR
To be mounted by customer
in machine tailpipe
1204F No DPF Sensor to be mounted by
customer on the
aftertreatment side of the
flexpipe fitted between Turbo
outlet and aftertreatment
To be mounted by customer
in machine tailpipe
Table 9.4 NOx Sensor Sensing Element Positioning
Both NOx sensors are available in 12 and 24V options as shown below.
Engine Out NOx:
12V NOx Sensor with Ampseal connector Key 1 359-9173
24V NOx sensor with Ampseal connector Key 1 359-9171
Tailpipe Out NOx:
12V NOx Sensor with Ampseal connector Key 2 359-9174
24V NOx sensor with Ampseal connector Key 2 359-9172