PACCAR PX-8 CM2150 (2007-09) Fault Code: 334 PID: 110 SPN: 100 FMI: 2 Engine Coolant Temperature – Data Erratic, Intermittent, or Incorrect. The engine coolant temperature reading is not changing with engine operating conditions.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.

Two different failure modes of the engine coolant temperature sensor can trigger this fault code. Either the sensor is not reading ambient air temperature after an extended period with the engine not running or the engine coolant temperature is not changing with engine operating conditions.

Possible causes:

1)Stuck in-range engine coolant temperature sensor
2)High resistance in the engine coolant temperature sensor signal or return lines.

Possible repairs:

1)Replace the thermostat.
2)Replace the engine coolant temperature sensor.
3)Replace the ECM.
4)Repair or replace the engine harness.

PACCAR PX-8 CM2150 (2007-09) Fault Code: 332 PID: SID 004 SPN: 654 FMI: 5 Injector Solenoid Driver Cylinder 4 Circuit – Current Below Normal or Open Circuit. High resistance or no current detected at cylinder 4 injector driver or return pin.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 331 PID: SID 002 SPN: 652 FMI: 5 Injector Solenoid Driver Cylinder 2 Circuit – Current Below Normal or Open Circuit. High resistance or no current detected at cylinder 2 injector supply or return pin.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 325 PID: SID 006 SPN: 656 FMI: 5 Injector Solenoid Driver Cylinder 6 Circuit – Current Below Normal or Open Circuit. High resistance or no current detected at cylinder 6 injector supply or return pin.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 324 PID: SID 003 SPN: 653 FMI: 5 Injector Solenoid Driver Cylinder 3 Circuit – Current Below Normal or Open Circuit. High resistance or no current detected at injector 3 supply or return pin.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 323 PID: SID 005 SPN: 655 FMI: 5 Injector Solenoid Driver Cylinder 5 Circuit – Current Below Normal or Open Circuit. High resistance or no current detected at cylinder 5 injector supply or return pin.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 322 PID: SID 001 SPN: 651 FMI: 5 Injector Solenoid Driver Cylinder 1 Circuit – Current Below Normal or Open Circuit. High resistance or no current detected at cylinder 1 injector driver or return pin.
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