Raider 2WD V6-3.7L (2008)
Maintenance Required Lamp/Indicator: Description and Operation
CHANGE OIL INDICATOR
DESCRIPTION
A change oil indicator is standard equipment on all instrument clusters. However, on vehicles manufactured for export markets, this indicator is
electronically disabled. This indicator is located within the odometer/trip odometer Vacuum Fluorescent Display (VFD) unit.
The change oil indicator consists of cycling textual Change and OIL messages which appear in place of the odometer/trip odometer information in the
odometer VFD unit. The odometer VFD is soldered onto the cluster electronic circuit board, and is visible through a window with a smoked clear lens
located on the lower edge of the tachometer gauge dial face of the cluster overlay. The dark lens over the VFD prevents it from being clearly visible
when it is not illuminated. The change oil textual messages appear in the same blue-green color and at the same lighting level as the odometer
information when they are illuminated by the instrument cluster electronic circuit board. The change oil indicator is serviced as a unit with the VFD in
the instrument cluster.
OPERATION
The change oil indicator gives an indication to the vehicle operator when a duty-cycle algorithm contained within the software of the Powertrain Control
Module (PCM) determines that a recommended oil change interval has been attained. This indicator is controlled by the instrument cluster logic circuit
based upon cluster programming and electronic messages received over the Controller Area Network (CAN) data bus from the PCM.
The change oil indicator function of the Vacuum Fluorescent Display (VFD) is completely controlled by the instrument cluster logic circuit, and that
logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start)
circuit. Therefore, the VFD change oil indication will always be OFF when the ignition switch is in any position except ON or START. The instrument
cluster will turn ON the change oil indicator for the following reasons:
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Change Oil Indicator Lamp-On Message - Each time the ignition switch is turned to the ON position and the cluster receives an electronic
change oil indicator lamp-ON message from the PCM indicating that a duty-cycle based recommended oil change interval has been attained, the
change oil indicator will be illuminated for about three seconds, until the trip odometer reset switch button is depressed, or until the ignition
switch is turned to the OFF position, whichever occurs first.
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Change Oil Indicator Reset Procedure - Once an engine oil change has been completed, the PCM duty cycle counters can be reset using the
following procedure. Turn the ignition switch to the ON position, but DO NOT start the engine. Slowly depress and release the accelerator pedal
fully three times within ten seconds. Turn the ignition switch to the OFF position. If the change oil indicator illuminates the next time the engine is
started, repeat this procedure.
The PCM continually monitors numerous sensor inputs to determine the duty-cycles to which the engine is being subjected. A pre-programmed
algorithm within the PCM then determines when to send the proper lamp-ON or lamp-OFF message to the ElectroMechanical Instrument Cluster
(EMIC) (also known as the Cab Compartment Node/CCN).
For proper diagnosis of the change oil indicator, the PCM, the EMIC, the CAN data bus or the electronic communication related to change oil indicator
operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.
