Oil Level Warning Indicator: Description and Operation

The Powertrain Control Module (PCM) controls the low oil indicator. The PCM activates the indicator for 3 to 5 seconds when the ignition switch is turned to the RUN position, with the engine off, in order to perform a bulb check. The PCM samples the oil level once per ignition cycle, at the power-up point, if it meets the criteria indicating that the oil has sufficiently drained into the oil pan from the last power-down. If the engine coolant temperature is greater than 75°C (167°F) at the power-down, 3 minutes must elapse after the power-down in order for the PCM to sample the oil level. If the engine coolant temperature is less than 75°C (167°F) at the power-down, the PCM looks for at least an 11°C (20°F) drop in the engine coolant temperature in order for the PCM to sample the oil level at the power-up point.