SPN 98 - FMI 2 (Fault Code 252)
SPN 98 - FMI 2 (Fault Code 252)
SPN98 FMI2
CODES:
Fault Code: 252
PID(P), SID(S): P98
SPN: 98
FMI: 2
Lamp: AMBER
SRT:
REASON: Engine Oil Level - Data Erratic, Intermittent, or Incorrect. An intermittent signal is being received from the oil level sensor.
EFFECT: Oil level sensor operation will be disabled.
Circuit Description:
The oil level sensor will monitor the oil fluid level in the oil pan at key-on. The oil level sensor will NOT monitor the oil level after the engine is started or when the engine speed is greater than 0 rpm. During engine key-on, if the oil level sensor detects a critical low oil level, then the amber CHECK ENGINE lamp will blink for 30 seconds and a fault code will be logged. If an operator observes a blinking amber CHECK ENGINE lamp at key-on, the operator MUST check the engine oil level with the manual dipstick.
SPN98 FMI2
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| ISB, ISC, and ISL - Oil Level Sensor Circuit |
CODES:
Fault Code: 252
PID(P), SID(S): P98
SPN: 98
FMI: 2
Lamp: AMBER
SRT:
REASON: Engine Oil Level - Data Erratic, Intermittent, or Incorrect. An intermittent signal is being received from the oil level sensor.
EFFECT: Oil level sensor operation will be disabled.
Circuit Description:
The oil level sensor will monitor the oil fluid level in the oil pan at key-on. The oil level sensor will NOT monitor the oil level after the engine is started or when the engine speed is greater than 0 rpm. During engine key-on, if the oil level sensor detects a critical low oil level, then the amber CHECK ENGINE lamp will blink for 30 seconds and a fault code will be logged. If an operator observes a blinking amber CHECK ENGINE lamp at key-on, the operator MUST check the engine oil level with the manual dipstick.
The oil level sensor provides
the ECM with a pulse width modulated (PWM) signal. Within this signal,
the oil level sensor
transmits the engine oil level reading,
oil temperature, and fault code information from the oil level sensor.
Component Location:
The oil level sensor is located on the left side of the engine on the front part of the dipstick port.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
Conditions for Setting the Fault Codes:
A valid PWM message is not received from the oil level sensor within the required time limits at initial key-on.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• The oil level sensor operation will be disabled.
Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE light and enable oil level sensor operation immediately after a valid PWM signal is received from the oil level sensor.
Shop Talk:
Possible causes of this fault code include:
• The oil level sensor is not receiving power from the ECM. This could be caused by an open circuit in the power supply or low voltage supplied by the primary engine ECM
• Open return circuit on the oil level sensor circuit between the engine ECM and the oil level sensor
• Open or short circuit on the oil level sensor signal circuit between the ECM and oil level sensor
• A damaged oil level sensor.
Component Location:
The oil level sensor is located on the left side of the engine on the front part of the dipstick port.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
Conditions for Setting the Fault Codes:
A valid PWM message is not received from the oil level sensor within the required time limits at initial key-on.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• The oil level sensor operation will be disabled.
Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE light and enable oil level sensor operation immediately after a valid PWM signal is received from the oil level sensor.
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. If necessary, recalibrate the ECM.
Possible causes of this fault code include:
• The oil level sensor is not receiving power from the ECM. This could be caused by an open circuit in the power supply or low voltage supplied by the primary engine ECM
• Open return circuit on the oil level sensor circuit between the engine ECM and the oil level sensor
• Open or short circuit on the oil level sensor signal circuit between the ECM and oil level sensor
• A damaged oil level sensor.
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