Install as follows:
1. Install new fuel compensation pressure sensor into doser block assembly using two bolts. Torque bolts to
11 N·m (8 lb·ft).
2. Install the hydrocarbon doser block assembly.
Removal of the Selective Catalytic Reduction Inlet Temperature
Sensor
1. Shut off engine and apply the parking brake, chock the wheels, and perform any other applicable safety
steps.
2. Disconnect the batteries. Refer to Original Equipment Manufacturer (OEM) procedures.
3. Disconnect the Selective Catalytic Reduction (SCR) inlet temperature sensor electrical connector (2) and
remove from the mounting bracket.
4. Remove the SCR inlet temperature sensor (1).
Installation of the Selective Catalytic Reduction Inlet
Temperature Sensor
1. Apply high temperature anti-seize to the threads of the Selective Catalytic Reduction (SCR) inlet
temperature sensor, but do not allow any to get on the sensor probe.
Note : DO NOT use excessive amounts; anti-seize will squeeze out during installation. DO NOT over-tighten
sensors; damage to threads may occur.
2. Install the SCR inlet temperature sensor (1). Torque to 35 to 38 N·m (26 to 28 lb·ft).
3. Connect the SCR inlet temperature sensor electrical connector (2) and install onto the mounting bracket.
To avoid injury from electrical shock, use care when connecting battery cables. The magnetic switch
studs are at battery voltage.
4. Connect the batteries. Refer to OEM procedures.
Removal of the Selective Catalytic Reduction Outlet
Temperature Sensor
1. Shut off engine and apply the parking brake, chock the wheels, and perform any other applicable safety
steps.
2. Disconnect the batteries. Refer to Original Equipment Manufacturer (OEM) procedures.
3. Remove the bolt (3) securing the sensor box cover and remove the cover (1).
4. Disconnect the Selective Catalytic Reduction (SCR) outlet temperature electrical connector (2).
5. Remove the sensor harness pass-through (4) and cut the zip-tie to free the harness from the sensor box.
6. Remove the SCR outlet temperature sensor (5).
Installation of the Selective Catalytic Reduction Outlet
Temperature Sensor
1. Apply high temperature anti-seize to the threads of the Selective Catalyst Reduction (SCR) outlet
temperature sensor, but do not allow any to get on the sensor probe.
Note : DO NOT use excessive amounts, anti-seize will squeeze out during installation. DO NOT over-tighten
sensors; damage to threads may occur.
2. Install the SCR outlet temperature sensor (5). Torque to 35 to 38 N·m (26 to 28 lb·ft).
3. Route the SCR outlet temperature sensor wiring harness through the pass-through (4) and zip-tie the pass
through.
4. Install the pass-through in the sensor box.
5. Connect the SCR outlet temperature sensor electrical connector (2).
6. Install the sensor box cover (1) and tighten the mounting bolt (3). Torque the bolt to 10 N·m (7 lbft).
7. Connect the batteries. Refer to OEM procedures.
Removal of the Selective Catalytic Reduction Inlet NOx Sensor
1. Shut off engine and apply the parking brake, chock the wheels, and perform any other applicable safety
steps.
2. Disconnect the batteries. Refer to Original Equipment Manufacturer (OEM) procedures.
3. Remove the bolt (3) securing the sensor box cover and remove the cover (1).
4. Remove the two bolts (2) that secure the Selective Catalytic Reduction (SCR) inlet NOx sensor Electronic
Control Unit (ECU) (5) to the sensor box and disconnect the ECU electrical connector (4).
5. Remove the sensor harness pass-through (6) and cut the zip-tie to free the ECU from the sensor box.
Note : Do NOT cut the wires to remove the NOx sensor; use a slotted automotive-type oxygen sensor socket.
6. Use a slotted socket to remove the SCR inlet NOx sensor (7 ). Remove the NOx sensor and ECU from the
aftertreatment.