SPN 98 - FMI 4 (Fault Code 499)

SPN 98 - FMI 4 (Fault Code: 499)
ISB, ISC, and ISL - Oil Level Sensor Circuit

Fault Code: 499
PID(P), SID(S): P98
SPN: 98
FMI: 4

REASON: Engine Oil Level Sensor Circuit - Voltage Below Normal or Shorted to Low Source. The engine oil level sensor has detected an internal failure.

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 the engine key-on, if the oil level sensor detects a critical low oil level, then the amber CHECK ENGINE light will blink for 30 seconds and a fault code will be logged. If an operator observes a blinking amber CHECK ENGINE light at key-on, the operator must check the
engine oil level with the manual dipstick.

The oil level sensor provides the electronic control module (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 oil 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:
The oil level sensor has detected an internal short or open circuit.

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:
• Open or short circuit internally to the oil level sensor
• A malfunctioning oil level sensor.

Read More:
SPN 98 - FMI 17 (Fault Code 471)
SPN 157 - FMI 4 (Fault Code 452)


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