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PACCAR PX-8 CM2150 (2007-09) Fault Code: 1844 PID: 101 SPN: 101 FMI: 4 Crankcase Pressure Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the crankcase pressure circuit.
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.
The crankcase pressure sensor shares supply and return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active. Before troubleshooting, check for multiple fault codes.
Possible causes:
1)Signal circuit open or shorted to ground in the engine harness or sensor
2)Supply wire open or shorted to ground.
Possible repairs:
1)Replace the crankcase pressure sensor.
2)Repair or replace the engine harness.
3)Replace the ECM.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 1843 PID: 101 SPN: 101 FMI: 3 Crankcase Pressure Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the crankcase pressure circuit.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 1696 PID: SID 232 SPN: 3513 FMI: 4 Sensor Supply 5 – Voltage Below Normal or Shorted to Low Source. Low voltage detected at sensor supply number 5 circuit in the OEM harness.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 1695 PID: SID 232 SPN: 3513 FMI: 3 Sensor Supply 5 – Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply number 5 circuit in the OEM harness.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 1691 PID: SPN: 3250 FMI: 13 Catalyst Efficiency – Out of Calibration. The temperature increase across the aftertreatment diesel oxidation catalyst is lower than expected.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 1676 PID: SPN: 3249 FMI: 2 Aftertreatment Exhaust Gas Temperature 2 – Data Erratic, Intermittent, or Incorrect. The aftertreatment diesel particulate filter inlet temperature sensor is not changing with engine operating conditions.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 1675 PID: SPN: 3249 FMI: 3 Aftertreatment Exhaust Gas Temperature 2 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the aftertreatment diesel particulate filter inlet temperature sensor circuit.