| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001GEI3 |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [01/2019 - 09/2022] |
| Title: 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: MIL Circuit; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022] | ||
|
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 power switch is turned on (IG), the MIL should be illuminated and should then turn off after the power switch is turned on (READY). If the MIL remains illuminated or is does not illuminate, conduct the following troubleshooting procedure.
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 |
Power switch on (IG) → Power switch on (READY) |
A |
|
Other than above |
- |
B |
| A |
|
|
|
2. |
CHECK COMMUNICATION BETWEEN TECHSTREAM AND ECM |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Check the communication between the Techstream and ECM.
HINT:
Communication can be checked by using the Data List item Engine.
|
Result |
Proceed to |
|---|---|
|
Communication is possible |
A |
|
Communication is not possible |
B |
| B |
|
|
|
3. |
CHECK WHETHER DTC OUTPUT RECURS |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(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 |
|
DTCs are 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 |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Combination Meter / Active Test / Check Engine Indicator.
Body Electrical > Combination Meter > Active Test
|
Tester Display |
|---|
|
Check Engine Indicator |
(e) According to the display on the Techstream, perform the Active Test and check the operation of the MIL.
|
Result |
Proceed to |
|---|---|
|
Changes |
A |
|
Does not change |
B |
| A |
|
REPLACE ECM
|
![2020 MY Corolla Corolla HV [01/2019 - 04/2020]; 2ZR-FXE (ENGINE CONTROL): ECM: REMOVAL](/t3Portal/stylegraphics/info.gif)
| B |
|
REPLACE COMBINATION METER ASSEMBLY
|
|
|