DTC 46 - Mil (Service Engine Soon Light) Circuit Fault: Notes

The MIL (SERVICE ENGINE SOON) should always light when the ignition is on and the engine is not running for 2 seconds. The PCM controls the MIL and makes it light by providing a ground path. DTC 46 will set when no ignition voltage on the MIL (SERVICE ENGINE SOON light) control circuit when the PCM is requesting the MIL on. PCM will default to no MIL.

NOTE: Test numbers refer to numbers on diagnostic chart.

This step checks the PCM's ability to command the MIL.
This step determines if an open is present in the ignition feed circuit.