M20A-FKS (ENGINE CONTROL): ECM: REMOVAL; 2020 MY Corolla Corolla Hatchback [01/2019

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM100000001HC8U
Model Year Start: 2020	Model: Corolla Hatchback	Prod Date Range: [01/2019 - 03/2019]
Title: M20A-FKS (ENGINE CONTROL): ECM: REMOVAL; 2020 MY Corolla Corolla Hatchback [01/2019 - 03/2019]

REMOVAL

CAUTION / NOTICE / HINT

The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during ECM removal/installation are shown below.

Necessary Procedures After Parts Removed/Installed/Replaced

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function when Necessary Procedure not Performed	Link
1: for Hatchback 2: w/ Smart Key System *3: w/o Smart Key System
Battery terminal is disconnected/reconnected	Perform steering sensor zero point calibration	Lane Control System (for Gasoline Model)
		Pre-collision System (for Gasoline Model)
		Lighting System (w/ AFS)(EXT)
	Initialize back door lock*1	Power Door Lock Control System (for Hatchback, Gasoline Model)
Replacement of ECM	Vehicle Identification Number (VIN) registration	MIL comes on
	ECU communication ID registration (Immobiliser system)	Engine start function
	Perform reset memory CVT oil pressure calibration Perform road test to allow TCM to learn	Large shift shock Deterioration of fuel efficiency	for Initialization for Registration
Replacement of ECM*2	Code registration (Smart Key System (for Gasoline Model, Start Function))	Wireless Door Lock Control System (for Gasoline Model with Smart Key System) Smart Key System (for Gasoline Model, Entry Function) Smart Key System (for Gasoline Model, Start Function) Steering lock function
Replacement of ECM*3	Code registration (Immobiliser system)	Engine start

NOTICE:

After the ignition switch is turned off, the radio and display receiver assembly records various types of memory and settings. As a result, after turning the ignition switch off, make sure to wait at least 85 seconds before disconnecting the cable from the negative (-) battery terminal. (for Audio and Visual System (for Gasoline Model))
After the engine switch is turned off, the radio and display receiver assembly records various types of memory and settings. As a result, after turning the engine switch off, make sure to wait at least 85 seconds before disconnecting the cable from the negative (-) battery terminal. (for Navigation System)
If the ECM has been struck or dropped, replace it.
Perform Vehicle Identification Number (VIN) registration when replacing the ECM.
Click here

PROCEDURE

1. PRECAUTION

NOTICE:

After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

Click here

3. REMOVE RADIATOR SUPPORT OPENING COVER

for Hatchback
Click here
w/ Illumination
Click here

4. REMOVE INLET NO. 1 AIR CLEANER

Click here

5. REMOVE AIR CLEANER CAP WITH AIR CLEANER HOSE

Click here

6. REMOVE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

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7. REMOVE AIR CLEANER CASE SUB-ASSEMBLY

(a) Remove the 2 bolts.

(b) Disengage the guide to remove the air cleaner case sub-assembly.

8. REMOVE ECM

(a) Disengage the claw and 2 guides to remove the No. 1 relay block cover from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Disconnect the 3 connectors from the No. 1 engine room relay block and No. 1 junction block assembly.

(c) Disengage the 2 claws to separate the engine wire from the No. 1 engine room relay block and No. 1 junction block assembly.

(d) Raise the 2 lock levers while pushing the locks on the levers, and disconnect the 2 ECM connectors.

NOTICE:

After disconnecting the ECM connectors, make sure that dirt, water or other foreign matter does not contact the connecting parts of the ECM connectors.

Grommet

(e) Remove the bolt and disengage the wire harness clamp to separate the engine wire.

(f) Remove the grommet.

(g) Remove the bolt and nut.

(h) Disengage the guide to remove the ECM.

NOTICE:

If the ECM has been struck or dropped, replace it.

9. REMOVE NO. 2 ECM BRACKET

(a) Remove the 2 screws and No. 2 ECM bracket from the ECM.

10. REMOVE NO. 1 ECM BRACKET

(a) Remove the 2 screws and No. 1 ECM bracket from the ECM.