Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001HAKC
Model Year Start: 2020 Model: GR Corolla Prod Date Range: [01/2019 - 09/2022]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): Engine does not Start; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]

Engine does not Start

DESCRIPTION

for Manual Transaxle

  • When the electrical key transmitter sub-assembly is in the cabin and the engine switch is pressed, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode. Additionally, when the clutch pedal is depressed, the engine can be started by pressing the engine switch.

except Manual Transaxle

  • When the electrical key transmitter sub-assembly is in the cabin and the engine switch is pressed, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode. Additionally, when the shift lever is in P and the brake pedal is depressed, the engine can be started by pressing the engine switch.

Related Data List and Active Test Items

Problem Symptom

Data List and Active Test

Engine does not start

Power Source Control

  • Stop Light Switch1*
  • Steering Unlock Switch
  • Shift P Signal*
  • Neutral SW/ Clutch SW
  • IG Relay Monitor (Inside)
  • IG Relay Monitor (Outside)
  • Latch Circuit
  • Starter Request Signal
  • Power Supply Condition

Smart Key

  • Immobiliser
  • Engine Start Request
  • S Code Check
  • L Code Check

Starting Control

  • Starter SW
  • Shift Position P or N*
  • Ignition
  • *: except Manual Transaxle

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus Body Electrical Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
  • The smart key system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.

    Click here 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING

  • If the smart key system (for Start Function) has been disabled, enable the system before performing troubleshooting.

    Click here 2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): CUSTOMIZE PARAMETERS

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the certification ECU (smart key ECU assembly) or an electrical key transmitter sub-assembly, refer to Registration.

    Click here 2020 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2019]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION 2020 MY Corolla Corolla Hatchback GR Corolla [09/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION 2021 - 2022 MY Corolla Corolla Hatchback GR Corolla [04/2020 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

  • After completing repairs, confirm that the problem does not recur.
  • After performing repairs, confirm that no DTCs are output by performing "DTC Output Confirmation Operation."

HINT:

  • If interior verification is unsuccessful, Operation History may be stored.
  • If Operation History has been stored, refer to the Operation History List to determine the detection conditions and narrow down trouble areas.

Body Electrical > Smart Key > Utility

Tester Display

Operation History

PROCEDURE

1.

CHECK WHETHER ENGINE STARTS

(a) Check that the engine starts.

OK:

Engine starts normally.

OK

CHECK OPERATION HISTORY

NG

2.

CHECK SECURITY INDICATOR LIGHT OPERATION

(a) Turn the engine switch off.

(b) When the immobiliser is set, check that the security indicator light blinks.

(c) Turn the engine switch on (IG).

(d) When the immobiliser is unset, check that the security indicator light turns off.

OK:

The security indicator light operate normally.

NG

GO TO OTHER PROBLEM (Immobiliser System does not Operate Properly)

OK

3.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Smart Key > Trouble Codes

OK:

LIN communication system DTC B2785 or B2789 is not output simultaneously.

NG

GO TO LIN COMMUNICATION SYSTEM

OK

4.

CHECK ENGINE CRANKING OPERATION

(a) Get into the vehicle while carrying an electrical key transmitter sub-assembly.

(b) Move the shift lever to P.*1

(c) Depress the brake pedal.*1

(d) Depress the clutch pedal.*2

(e) Check that the key indicator display is displayed on the multi-information display in the combination meter assembly, and then press the engine switch and check that the engine cranks.

  • *1: except Manual Transaxle
  • *2: for Manual Transaxle

Result

Proceed to

Engine cranks and initial combustion occurs

A

Engine cranks but initial combustion does not occur

B

Engine does not crank

C
A

GO TO OTHER PROBLEM (Immobiliser System does not Operate Properly)

B

GO TO SFI SYSTEM

for M20A-FKS: Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

for 2ZR-FAE: Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

C

5.

CHECK ENGINE SWITCH CONDITION

(a) Get into the vehicle while carrying an electrical key transmitter sub-assembly.

(b) Move the shift lever to P.*1

(c) With the brake pedal released, check that pressing the engine switch causes the power source mode to change.*1

(d) With the clutch pedal released, check that pressing the engine switch causes the power source mode to change.*2

  • *1: except Manual Transaxle
  • *2: for Manual Transaxle

Result

Proceed to

Power source mode changes : Off → on (ACC) → on (IG) → off

(except Manual Transaxle)

A

Power source mode changes : Off → on (ACC) → on (IG) → off

(for Manual Transaxle)

B

Power source mode does not change to on (ACC) or on (IG)

C

Power source mode changes to on (IG) but not to on (ACC)

D

Power source mode changes to on (ACC) but not to on (IG)

E
B

GO TO STEP 15

C

GO TO OTHER PROBLEM (Power Source Mode does not Change to ON (IG and ACC)) 2020 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): Power Source Mode does not Change to ON (IG and ACC) 2021 MY Corolla Corolla Hatchback GR Corolla [04/2020 - 06/2021]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): Power Source Mode does not Change to ON (IG and ACC) 2022 MY Corolla Corolla Hatchback GR Corolla [06/2021 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): Power Source Mode does not Change to ON (IG and ACC)

D

GO TO OTHER PROBLEM (Power Source Mode does not Change to ON (ACC))

E

GO TO OTHER PROBLEM (Power Source Mode does not Change to ON (IG))

A

6.

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH1)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Power Source Control / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light Switch1

State of brake pedal

OFF or ON

OFF: Brake pedal released

ON: Brake pedal depressed
  • Use this item to determine if the stop light switch assembly is malfunctioning.
  • The engine cannot be started when this item is OFF.
  • If the stop light switch assembly is malfunctioning, the engine can be started by pressing and holding the engine switch for a certain period of time.

Body Electrical > Power Source Control > Data List

Tester Display

Stop Light Switch1

OK:

The Techstream display changes correctly in response to the brake pedal operation.

NG

GO TO STEP 16

OK

7.

READ VALUE USING TECHSTREAM (NEUTRAL SW/ CLUTCH SW, SHIFT POSITION P OR N)

(a) Enter the following menus: Body Electrical / Power Source Control or Starting Control / Data List.

(b) Read the Data List according to the display on the Techstream.

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Neutral SW/ Clutch SW

Shift position (P and N)

OFF or ON

OFF: Shift lever in any position other than P or N

ON: Shift lever in P or N
  • Use this item to determine if the park/neutral position switch assembly is malfunctioning.
  • When the engine cannot be started due to a park/neutral position switch assembly malfunction, OFF is displayed.

Body Electrical > Power Source Control > Data List

Tester Display

Neutral SW/ Clutch SW

Body Electrical > Starting Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Shift Position P or N

Park/Neutral position switch status

OFF or ON

OFF: Shift lever not in P or N

ON: Shift lever in P or N

When OFF is displayed, the engine will not crank.

Body Electrical > Starting Control > Data List

Tester Display

Shift Position P or N

OK:

The Techstream display changes correctly in response to the shift lever operation.

NG

GO TO STEP 18

OK

8.

READ VALUE USING TECHSTREAM (STARTER REQUEST SIGNAL)

(a) Enter the following menus: Body Electrical / Power Source Control / Data List.

(b) Read the Data List according to the display on the Techstream.

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Starter Request Signal

Engine start request signal status

OFF or ON

for Manual Transaxle

  • OFF: The engine switch is not pressed
  • ON: With the clutch pedal depressed, the engine switch is pressed and held

except Manual Transaxle

  • OFF: The engine switch is not pressed
  • ON: With the shift lever in P and the brake pedal depressed, the engine switch is pressed and held
  • When the engine cannot be started due to a start request signal malfunction, OFF is displayed.
  • When the engine switch is pressed, the duration of time that ON is displayed will be extremely short. As such, the engine switch needs to be pressed and held for a certain period of time.

Body Electrical > Power Source Control > Data List

Tester Display

Starter Request Signal

NOTICE:

Check that the key indicator display is displayed on the multi-information display in the combination meter assembly, and then press the engine switch.

OK:

The Techstream display changes correctly in response to the engine switch operation.

NG

GO TO STEP 20

OK

9.

READ VALUE USING TECHSTREAM (STARTER SW)

(a) Get into the vehicle while carrying an electrical key transmitter sub-assembly.

(b) Move the shift lever to P.*1

(c) Enter the following menus: Body Electrical / Starting Control / Data List.

(d) According to the display on the Techstream, read the Data List while pressing the engine switch with the brake pedal depressed.*1

(e) According to the display on the Techstream, read the Data List while pressing the engine switch with the clutch pedal depressed.*2

  • *1: except Manual Transaxle
  • *2: for Manual Transaxle

Body Electrical > Starting Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Starter SW

Starter operation request

OFF or ON

OFF: Starter operation not requested

ON: Starter operation requested

When OFF is displayed, the engine will not crank.

Body Electrical > Starting Control > Data List

Tester Display

Starter SW

OK:

The Techstream display changes.

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

OK

10.

INSPECT ST RELAY

(a) Inspect the ST relay.

for M20A-FKS: Click here 2019 - 2023 MY Corolla Corolla Hatchback [06/2018 - 03/2023]; M20A-FKS (STARTING): RELAY: INSPECTION

for 2ZR-FAE: Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (STARTING): RELAY: INSPECTION

NG

REPLACE ST RELAY
OK

11.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST RELAY)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

No. 1 engine room relay block and No. 1 junction block assembly ST relay terminal 2 - Body ground

for Manual Transaxle

  • Engine switch pressed and held with clutch pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off)

except Manual Transaxle

  • Engine switch pressed and held with brake pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off)

6 V or higher* → 1.0 V or less

HINT:

*: While the engine is cranking, the battery voltage may drop to approximately 6 V.

*1

No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly

(ST Relay Holder)
NG

GO TO STEP 23

OK

12.

CHECK HARNESS AND CONNECTOR (ST RELAY - BATTERY AND GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

No. 1 engine room relay block and No. 1 junction block assembly ST relay terminal 1 - Body ground

Always

Below 1 Ω

*1

No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly

(ST Relay Holder)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

No. 1 engine room relay block and No. 1 junction block assembly ST relay terminal 5 - Body ground

Always

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

13.

CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - ST RELAY)

(a) Disconnect the C82 starter assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

No. 1 engine room relay block and No. 1 junction block assembly ST relay terminal 3 - C82-1 (ST)

Always

Below 1 Ω

No. 1 engine room relay block and No. 1 junction block assembly ST relay terminal 3 or C82-1 (ST) - Other terminals and body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

14.

CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - BATTERY)

(a) Disconnect the C111 starter assembly connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

C111-1 (B) - Body ground

Always

11 to 14 V
OK

REPLACE STARTER ASSEMBLY

for M20A-FKS: Click here 2020 MY Corolla Corolla Hatchback [01/2019 - 03/2019]; M20A-FKS (STARTING): STARTER: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback [03/2019 - 09/2022]; M20A-FKS (STARTING): STARTER: REMOVAL

for 2ZR-FAE: Click here 2020 MY Corolla [01/2019 - 03/2019]; 2ZR-FAE (STARTING): STARTER: REMOVAL 2020 - 2022 MY Corolla [03/2019 - 09/2022]; 2ZR-FAE (STARTING): STARTER: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

15.

READ VALUE USING TECHSTREAM (NEUTRAL SW/ CLUTCH SW)

(a) Enter the following menus: Body Electrical / Power Source Control / Data List.

(b) Read the Data List according to the display on the Techstream.

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Neutral SW/ Clutch SW

State of clutch pedal

OFF or ON

OFF: Clutch pedal released

ON: Clutch pedal depressed
  • Use this item to help determine if the clutch start switch is malfunctioning.
  • The engine cannot be started when this item is "OFF".

Body Electrical > Power Source Control > Data List

Tester Display

Neutral SW/ Clutch SW

OK:

The Techstream display changes correctly in response to the clutch pedal operation.

OK

GO TO STEP 8

NG

GO TO STEP 21

16.

INSPECT STOP LIGHT SWITCH ASSEMBLY

(a) Inspect the stop light switch assembly.

Click here 2020 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 -        ]; LIGHTING (EXT): STOP LIGHT SWITCH: ON-VEHICLE INSPECTION

NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

OK

17.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STOP LIGHT SWITCH ASSEMBLY)

(a) Disconnect the O61 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the A53 stop light switch assembly connector.

(c) Disconnect the A47*1 or A46*2 ECM connector.

  • *1: for M20A-FKS
  • *2: for 2ZR-FAE

(d) Disconnect the A51 skid control ECU (brake actuator assembly) connector.

(e) Disconnect the I17 shift lock control unit assembly connector.

(f) Disconnect the C80 transmission control ECU assembly connector.

(g) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

O61-24 (STP1) - A53-3 (L)

Always

Below 1 Ω

O61-24 (STP1) or A53-3 (L) - Other terminals and body ground

Always

10 kΩ or higher
OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

18.

INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

(a) Remove the park/neutral position switch assembly.

for K120: Click here 2020 MY Corolla Corolla Hatchback [01/2019 - 03/2019]; K120 / K121 (CVT): K120 PARK / NEUTRAL POSITION SWITCH: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback [03/2019 - 09/2022]; K120 / K121 (CVT): K120 PARK / NEUTRAL POSITION SWITCH: REMOVAL

for K313: Click here 2020 MY Corolla Corolla Hatchback [01/2019 - 03/2019]; K313 (CVT): PARK / NEUTRAL POSITION SWITCH: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback [03/2019 - 09/2022]; K313 (CVT): PARK / NEUTRAL POSITION SWITCH: REMOVAL

(b) Inspect the park/neutral position switch assembly.

for K120: Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; K120 / K121 (CVT): K120 PARK / NEUTRAL POSITION SWITCH: INSPECTION

for K313: Click here 2020 - 2023 MY Corolla Corolla Hatchback [01/2019 - 11/2022]; K313 (CVT): PARK / NEUTRAL POSITION SWITCH: INSPECTION

NG

REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY

for K120: Click here 2020 MY Corolla Corolla Hatchback [01/2019 - 03/2019]; K120 / K121 (CVT): K120 PARK / NEUTRAL POSITION SWITCH: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback [03/2019 - 09/2022]; K120 / K121 (CVT): K120 PARK / NEUTRAL POSITION SWITCH: REMOVAL

for K313: Click here 2020 MY Corolla Corolla Hatchback [01/2019 - 03/2019]; K313 (CVT): PARK / NEUTRAL POSITION SWITCH: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback [03/2019 - 09/2022]; K313 (CVT): PARK / NEUTRAL POSITION SWITCH: REMOVAL

OK

19.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK/NEUTRAL POSITION SWITCH ASSEMBLY)

(a) Disconnect the O62 certification ECU (smart key ECU assembly) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

O62-2 (STAR) - C62-4 (B)

Always

Below 1 Ω

O62-2 (STAR) or C62-4 (B) - Other terminals and body ground

Always

10 kΩ or higher
OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

20.

CHECK STEERING LOCK FUNCTION

(a) Check that the steering unlocks when the engine switch is turned on (ACC).

OK:

The steering unlocks.

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

NG

GO TO OTHER PROBLEM (Unable to Unlock Steering Wheel (Engine cannot Start))

21.

INSPECT CLUTCH SWITCH ASSEMBLY

(a) Remove the clutch switch assembly.

Click here 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; CLUTCH: CLUTCH PEDAL SWITCH: REMOVAL

(b) Inspect the clutch switch assembly.

Click here 2020 - 2023 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 11/2022]; CLUTCH: CLUTCH PEDAL SWITCH: INSPECTION

NG

REPLACE CLUTCH SWITCH ASSEMBLY

OK

22.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - CLUTCH SWITCH ASSEMBLY)

(a) Disconnect the O62 certification ECU (smart key ECU assembly) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

O62-2 (STAR) - A60-2

Always

Below 1 Ω

O62-2 (STAR) or A60-2 - Other terminals and body ground

Always

10 kΩ or higher
OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

23.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

O62-2 (STAR) - Body ground

for Manual Transaxle

  • Engine switch pressed and held with clutch pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off)

except Manual Transaxle

  • Engine switch pressed and held with brake pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off)

6 V or higher* → 1.0 V or less

HINT:

*: While the engine is cranking, the battery voltage may drop to approximately 6 V.

*a

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

Result

Proceed to

OK (except Manual Transaxle)

A

OK (for Manual Transaxle)

B

NG

C
B

GO TO STEP 29

C

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

A

24.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK/NEUTRAL POSITION SWITCH ASSEMBLY)

(a) Disconnect the O62 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the C62 park/neutral position switch assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

O62-2 (STAR) - C62-4 (B)

Always

Below 1 Ω

O62-2 (STAR) or C62-4 (B) - Other terminals and body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

25.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Install the ST relay to the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

O62-1 (STA) - Body ground

for Manual Transaxle

  • Engine switch pressed and held with clutch pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off)

except Manual Transaxle

  • Engine switch pressed and held with brake pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off)

6 V or higher* → 1.0 V or less

HINT:

*: While the engine is cranking, the battery voltage may drop to approximately 6 V.

*a

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

OK

26.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST RELAY)

(a) Disconnect the O62 certification ECU (smart key ECU assembly) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

O62-1 (STA) - 1 (ST relay)

Always

Below 1 Ω

O62-1 (STA) or 1 (ST relay) - Other terminals and body ground

Always

10 kΩ or higher

Result

Proceed to

OK (except Manual Transaxle)

A

OK (for Manual Transaxle)

B

NG

C
B

GO TO STEP 28

C

REPAIR OR REPLACE HARNESS OR CONNECTOR
A

27.

CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ST RELAY)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for M20A-FKS

Tester Connection

Condition

Specified Condition

C62-5 (L) - 1 (ST relay)

Always

Below 1 Ω

C62-5 (L) or 1 (ST relay) - Other terminals and body ground

Always

10 kΩ or higher

for 2ZR-FAE

Tester Connection

Condition

Specified Condition

C62-9 (L) - 1 (ST relay)

Always

Below 1 Ω

C62-9 (L) or 1 (ST relay) - Other terminals and body ground

Always

10 kΩ or higher
OK

GO TO SFI SYSTEM

for M20A-FKS: Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

for 2ZR-FAE: Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

28.

CHECK HARNESS AND CONNECTOR (CLUTCH SWITCH ASSEMBLY - ST RELAY)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A60-1 - 1 (ST relay)

Always

Below 1 Ω

A60-1 or 1 (ST relay) - Other terminals and body ground

Always

10 kΩ or higher
OK

GO TO SFI SYSTEM

for M20A-FKS: Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

for 2ZR-FAE: Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

29.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - CLUTCH SWITCH ASSEMBLY)

(a) Disconnect the O62 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the A60 clutch switch assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

O62-2 (STAR) - A60-2

Always

Below 1 Ω

O62-2 (STAR) or A60-2 - Other terminals and body ground

Always

10 kΩ or higher
OK

GO TO STEP 25

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR