PACCAR PX-9 CM2350 (2013-17) Fault Code:3318 PID: SPN:3242 FMI:2 Aftertreatment 1 Diesel Particulate Filter Intake Temperature – Data Erratic, Intermittent, or Incorrect

Reason:
Aftertreatment Diesel Particulate Filter Intake Temperature – Data Erratic, Intermittent, or Incorrect. The aftertreatment diesel particulate filter intake temperature is not changing with engine operating conditions.

Effect:
Possible reduced engine performance.

Circuit Description:
The aftertreatment diesel particulate filter temperature sensor module is a smart device that communicates with the engine control module via the J1939 data link. The aftertreatment diesel partculate filter temperature sensor module performs its own internal diagnostics and reports malfunctions back to the engine control module using the J1939 data link. The aftertreatment diesel particulate filter temperature sensor module is used to measure the aftertreatment diesel oxidation catalyst intake temperature, aftertreatment diesel particulate filter intake temperature, and aftertreatment diesel particulate filter outlet temperature. The temperature probes are permanently attached to the aftertreatment diesel particulate filter temperature sensor module and can not be replaced individually.

Component Location:
The aftertreatment diesel particulate filter intake temperature sensor is located in the aftertreatment system. It is located at the outlet of the diesel oxidation catalyst and before the diesel particulate filter. Refer to the original equipment manufacturer (OEM) service manual.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position and the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the difference between the aftertreatment diesel particulate filter intake temperature sensor data and diesel particulate filter outlet temperature sensor data did not match the expected value for the present engine operating conditions.

Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp and/or Malfunction Indicator Lamp (MIL) after the diagnostic fails on two consecutive trips.
2) A default value for the aftertreatment diesel particulate filter intake temperature reading is used.
3) Diesel exhaust fluid injection into the aftertreatment system is disabled.
4) Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.

Conditions for Clearing the Fault Code:
1) To validate the repair, start the engine and operate it at high idle for 15 minutes. It is necessary to elevate the exhaust flow to clear this fault code. For certain applications, it can be necessary to drive the vehicle in order to achieve adequate exhaust flow.
2) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
4) For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where the diagnostic runs and passes.
5) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.

For intermittent power supply and datalink communication issues with Aftertreatment Components, it is highly recommended that the OEM Power Distribution Center fuses and relays be thoroughly checked for loose, missing or intermittent connections.

Possible Causes:
1) A malfunctioning aftertreatment diesel particulate filter intake temperature sensor
2) A malfunctioning aftertreatment diesel particulate filter outlet temperature sensor