Mountaineer V8-302 5.0L VIN P EFI (1998)
Oil Level Warning (LOW OIL LEVEL)
This warning message is displayed when the engine oil level is low.
When the engine oil level is normal, the input to the message center indicator will be an open circuit.
When the engine oil level is low, the low oil level sensor in the combination oil temperature/low oil level sensor will close, grounding the input to the
message center indicator and the warning will be displayed during the next ignition cycle of OFF to RUN. This low oil level sensor is only monitored
when the ignition switch is OFF.
There is a delay of up to 12 minutes in this monitoring in order to allow the oil to drain back into the oil pan and reach the correct level.
Oil Life Warning (CHANGE OIL SOON or OIL CHANGE REQUIRED)
If the connection to the oil temperature sensor is open circuit or shorted, the message center display will read OIL TEMP SIGNAL ERROR instead of
displaying the PERCENTAGE OIL LIFE LEFT during system check sequence.
One of these warning messages is displayed when the engine oil life remaining is five percent or less.
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When oil life left is between five percent and zero percent, the "CHANGE OIL SOON" message will be displayed.
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When oil life left reaches zero percent, the "OIL CHANGE REQUIRED" message will be displayed.
The message center indicator will indicate the percent of oil life remaining during System Check. This percentage is based on the driving history and the
time since the last oil change. In order to ensure accurate oil life left indications, the driver should only perform the OIL CHANGE RESET procedure, as
described in the Owner Guide, after an oil change.
To calculate the percentage of oil life remaining, the oil life feature uses:
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Oil temperature sensor input.
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Tachometer input from the Ignition Control Module (ICM).
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Vehicle speed signal input.
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Clock time (maintained internally by the message center).
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The oil life will decrease from 100 percent to 0 percent in no more than 12,070 km (7,500 mi) or 6 months. It will reach zero percent sooner
under different driving conditions.
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The percentage of oil life remaining is the second display in the system check sequence.
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When oil life remaining is between five percent and zero percent, the "CHANGE OIL SOON" message will be displayed.
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When oil life left reaches zero percent, the "OIL CHANGE REQUIRED" message will be displayed.
Washer Fluid Level Warning (LOW WASHER FLUID)
This warning message is displayed when there is less than one quarter of the container of washer fluid remaining.
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When the washer fluid level is normal, the windshield washer reservoir fluid level sensor will close, grounding the input at C2009-31 of the
message center indicator.
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When the washer fluid level is low, the input to the message center indicator will be open and the warning will be displayed.
The message center indicator filters this input therefore, there will be a 20-second delay before the warning is displayed or removed.
Warning Chime
A short warning chime (0.1 second) is output with every message center switch press. A longer warning chime (1.0 second) is output when a new
warning first appears on the message center indicator display.
To activate the warning, the message center pulls the chime request output below one volt during the length of the tone.
