DESCRIPTION
The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunction detected by the ECM. When the ignition switch is turned to ON, power is supplied to the MIL circuit, and the ECM provides the circuit ground which illuminates the MIL.
The MIL operation can be checked visually: When the ignition switch is first turned to ON, the MIL should be illuminated and should then turn off. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the intelligent tester.
WIRING DIAGRAM
*1 | from IG2 Relay |
*2 | METER |
*3 | Combination Meter |
CAUTION / NOTICE / HINT
Note
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
CHECK THAT MIL IS ILLUMINATED
Turn the ignition switch to ON.
Check the illumination of the MIL.
Condition | Proceed to |
---|---|
MIL remains illuminated (Even after ignition switch ON and several seconds have passed, MIL still remains illuminated) | A |
MIL remains off (Does not illuminate at all) | B |
MIL illuminates for several seconds, but turns off after engine is started | C |
B |
CHECK THAT ENGINE STARTS Click here |
C |
SYSTEM OK |
A |
CHECK WHETHER MIL TURNS OFF
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Check if any DTCs have been stored. Note down any DTCs.
Clear the DTCs Click here.
Check if the MIL goes off.
OK |
---|
MIL goes off. |
OK |
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here |
NG |
CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS)
*1 | Front view of wire harness connector (to ECM) |
Disconnect the ECM connector.
Turn the ignition switch to ON.
Check that the MIL is not illuminated.
OK |
---|
MIL is not illuminated. |
Reconnect the ECM connector.
OK |
REPLACE ECM Click here |
NG |
CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM)
Disconnect the combination meter connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for short) | ||||||
---|---|---|---|---|---|---|
|
Reconnect the combination meter connector.
Reconnect the ECM connector.
OK |
CHECK COMBINATION METER Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER - ECM) |
CHECK THAT ENGINE STARTS
Turn the ignition switch to ON.
Start the engine.
Result | Proceed to |
---|---|
Engine starts | A |
Engine does not start* | B |
Tech Tips
*: The intelligent tester cannot communicate with the ECM.
B |
GO TO VC OUTPUT CIRCUIT Click here |
A |
CHECK ECM (TERMINAL VOLTAGE)
*1 | Front view of wire harness connector (to ECM) |
Disconnect the ECM connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Reconnect the ECM connector.
OK |
REPLACE ECM Click here |
NG |
CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM)
Disconnect the combination meter connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for open) | ||||||
---|---|---|---|---|---|---|
|
Reconnect the ECM connector.
Reconnect the combination meter connector.
OK |
CHECK COMBINATION METER Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER - ECM) |