SPN 101 - FMI 2 (Fault Code 1942)
SPN101 FMI2
Crankcase Pressure - Data Erratic, Intermittent, or Incorrect
CODES:
Fault Code: 1942
PID(P), SID(S): P101
SPN: 101
FMI: 2
Lamp: Amber
REASON: Crankcase Pressure - Data Erratic, Intermittent, or Incorrect. The ECM has detected that the crankcase pressure signal is not changing with engine operating conditions.
EFFECT: None on performance.
Circuit Description:
The crankcase pressure sensor is used to monitor the pressure inside the crankcase. The electronic control module (ECM) supplies the crankcase pressure sensor a 5 volt reference voltage. When the crankcase pressure is low, the sensor signal voltage is low. When the crankcase pressure is high, the sensor signal voltage is near the 5 volt reference voltage. The ECM monitors the crankcase pressure signal circuit voltage to calculate the pressure of the air within the crankcase.
Component Location:
Use the following procedure for a detailed component location view of the crankcase pressure sensor and crankcase filter.
Conditions for Running the Diagnostics:
The first part of this diagnostic runs at initial key ON and the second part runs when the engine is running.
Conditions for Setting the Fault Codes:
The ECM detects that the crankcase pressure sensor is reading an erratic value at key ON or the crankcase pressure reading is not changing with engine operating conditions.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.
Shop Talk:
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.
This fault code can be caused by a crankcase breather hose disconnected between the engine outlet and the crankcase filter assembly on engines with an externally mounted crankcase filter option.
This check is only performed at keyswitch OFF, during the ECM powerdown. During this diagnostic check, the ECM monitors the value of the crankcase pressure sensor. If this value is outside of a specified range, Fault Code 1942 is set active at the next key ON.
Possible causes of this fault code include:
• Resistance in the wiring harness
• A malfunctioning in-range pressure sensor.
This fault code can be triggered if the crankcase pressure sensor is not installed correctly in the housing.
Read More:
SPN 3251 - FMI 16 (Fault Code 1921)
SPN 3597 - FMI 18 (Fault Code 1938)
Blog.Teknisi
Crankcase Pressure - Data Erratic, Intermittent, or Incorrect
 |
| ISB, ISC, ISL CM2150 - Crankcase Pressure Sensor |
CODES:
Fault Code: 1942
PID(P), SID(S): P101
SPN: 101
FMI: 2
Lamp: Amber
REASON: Crankcase Pressure - Data Erratic, Intermittent, or Incorrect. The ECM has detected that the crankcase pressure signal is not changing with engine operating conditions.
EFFECT: None on performance.
Circuit Description:
The crankcase pressure sensor is used to monitor the pressure inside the crankcase. The electronic control module (ECM) supplies the crankcase pressure sensor a 5 volt reference voltage. When the crankcase pressure is low, the sensor signal voltage is low. When the crankcase pressure is high, the sensor signal voltage is near the 5 volt reference voltage. The ECM monitors the crankcase pressure signal circuit voltage to calculate the pressure of the air within the crankcase.
Component Location:
Use the following procedure for a detailed component location view of the crankcase pressure sensor and crankcase filter.
Conditions for Running the Diagnostics:
The first part of this diagnostic runs at initial key ON and the second part runs when the engine is running.
Conditions for Setting the Fault Codes:
The ECM detects that the crankcase pressure sensor is reading an erratic value at key ON or the crankcase pressure reading is not changing with engine operating conditions.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.
Shop Talk:
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.
This fault code can be caused by a crankcase breather hose disconnected between the engine outlet and the crankcase filter assembly on engines with an externally mounted crankcase filter option.
This check is only performed at keyswitch OFF, during the ECM powerdown. During this diagnostic check, the ECM monitors the value of the crankcase pressure sensor. If this value is outside of a specified range, Fault Code 1942 is set active at the next key ON.
Possible causes of this fault code include:
• Resistance in the wiring harness
• A malfunctioning in-range pressure sensor.
This fault code can be triggered if the crankcase pressure sensor is not installed correctly in the housing.
Read More:
SPN 3251 - FMI 16 (Fault Code 1921)
SPN 3597 - FMI 18 (Fault Code 1938)
Blog.Teknisi
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