| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000001GKCB |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [01/2019 - 11/2022] |
| Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: MIL Circuit; 2020 - 2023 MY Corolla [01/2019 - 11/2022] | ||
|
MIL Circuit |
DESCRIPTION
The Malfunction Indicator Lamp (MIL) is used to indicate vehicle malfunctions detected by the ECM.
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 after the engine is started. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the Techstream.
WIRING DIAGRAM
PROCEDURE
|
1. |
CHECK THAT MIL IS ILLUMINATED |
(a) Perform troubleshooting in accordance with the table below.
|
MIL |
Condition |
Proceed to |
|---|---|---|
|
Illuminates → Turns off |
Ignition switch ON → engine is started |
A |
|
Other than above |
- |
B |
| A |
|
|
|
2. |
CHECK COMMUNICATION BETWEEN TECHSTREAM AND ECM |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Check the communication between the Techstream and ECM.
HINT:
It can be checked using the "Engine and ECT" item of the Data List.
|
Result |
Proceed to |
|---|---|
|
Communication is possible |
A |
|
Communication is not possible |
B |
| B |
|
GO TO VC OUTPUT CIRCUIT
|
![2020 MY Corolla [01/2019 - 03/2019]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: VC Output Circuit](/t3Portal/stylegraphics/info.gif)
|
|
3. |
CHECK WHETHER DTC OUTPUT RECURS |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: System Select / Health Check.
(e) Check if any DTCs have been detected. Note down any DTCs.
|
Result |
Proceed to |
|---|---|
|
DTCs are not output |
A |
|
Any DTCs is output |
B |
HINT:
Check for detected DTCs output from other ECUs which relate to the MIL.
| B |
|
REPAIR CIRCUIT INDICATED BY OUTPUT |
|
|
4. |
PERFORM ACTIVE TEST USING TECHSTREAM (CHECK ENGINE WARNING) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Combination Meter / Active Test / Check Engine Warning.
Body Electrical > Combination Meter > Active Test
|
Tester Display |
|---|
|
Check Engine Warning |
(e) Check the status of the MIL while performing the Active Test.
|
Result |
Proceed to |
|---|---|
|
Changes |
A |
|
Does not change |
B |
| A |
|
REPLACE ECM
|
| B |
|
REPLACE COMBINATION METER ASSEMBLY
|
|
|