MIL Circuit

FA20 ENGINE CONTROL: SFI SYSTEM: MIL Circuit; 2013 MY FR-S [03/2012 -]
- MIL Circuit

DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunctions detected by the ECM. When the ignition switch is turned to ON, power is supplied to the MIL circuit, which illuminates the MIL.

The MIL operation can be checked visually: When the ignition switch is turned to ON, the MIL should be illuminated and should turn off after engine is started. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the Techstream.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. CHECK THAT MIL IS ILLUMINATED

(a) Perform troubleshooting in accordance with the table below.

Result





B -- CHECK THAT ENGINE STARTS

C -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems
A -- Continue to next step.

2. CHECK WHETHER MIL TURNS OFF

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Check if any DTCs have been detected. Note down any DTCs.

Result





HINT
Check for detected DTCs output from other ECUs which relate to the MIL.

B -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

A -- GO TO METER / GAUGE SYSTEM Meter / Gauge System

3. CHECK THAT ENGINE STARTS

(a) Turn the ignition switch to ON.

(b) Start the engine.

Result





HINT
*: The Techstream cannot communicate with the ECM.

B -- GO TO VC OUTPUT CIRCUIT VC Output Circuit

A -- REPLACE COMBINATION METER Removal