Circuit Description

The engine oil level switch is a float-type switch that grounds the oil level switch circuit when oil level is okay. PCM checks the engine oil level switch circuit at start-up. Before checking the state of the engine oil level switch, PCM performs a test routine based on time and coolant temperature to ensure that engine oil has drained back into the sump.

To test for low oil at start-up, one of the following conditions must be met:

• If ECT is between 59-194°F (15-90°C) at last key off, ECT must be at least 22°F (12°C) cooler that ECT at last key on.
• If ECT was greater than 194°F (90°C) at last key off, the time between last key off and present key on must be sufficient to allow oil to drain back to sump.

The LOW OIL light will illuminate for about a minute when PCM checks for low oil level and engine oil level switch indicates that a low oil level condition exists. Turn ignition is first turned on, PCM will command LOW OIL light to illuminate for a brief period to test light bulb.

Conditions for setting DTC:

• Ignition on.
• Improper voltage level detected on cruise inhibit output driver circuit.
• Conditions present for at least 20 seconds.