Powertrain Controls - ECM/PCM

DTC 46 MIL "Service Engine Soon" Circuit Fault:

MIL Service Engine Soon Circuit Fault:

CIRCUIT DESCRIPTION
There should always be a Malfunction Indicator Lamp (MIL) Service Engine Soon when the ignition is "ON" and the engine stopped. The PCM will control the MIL and turn it "ON" by providing a ground path.

DIAGNOSTIC TROUBLE CODE (DTC) 46 WILL SET WHEN
Ignition voltage on CKT 419 when PCM is requesting MIL "ON."
OR
No ignition voltage on CKT 419 when PCM is requesting MIL "OFF."

ACTION TAKEN (PCM will default to)
No MIL.

DTC 46 WILL CLEAR WHEN
The fault condition(s) no longer exist.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks the ability of the PCM to command the MIL.
2. This test will determine if there is an open in ignition feed circuit or CKT 419.

DIAGNOSTIC AIDS
Check for faulty bulb or fuse. An open in CKT 419 will cause a DTC 46 to set.