Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GKC9
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: Starter Signal Circuit; 2020 - 2022 MY Corolla [01/2019 - 09/2022]

Starter Signal Circuit

DESCRIPTION

While the engine is being cranked, current flows from terminal ST1 of the ignition or starter switch assembly*1 or terminal STAR of the certification ECU (smart key ECU assembly)*2 to the park/neutral position switch assembly*3 or clutch start switch assembly*4 and to terminal STA of the ECM (STA signal).

*1: w/o Smart Key System

*2: w/ Smart Key System

*3: for CVT models

*4: for Manual Transaxle models

WIRING DIAGRAM

Refer to DTC P0617.

Click here 2020 MY Corolla [01/2019 - 03/2019]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P0617; Starter Relay Circuit High+ 2020 - 2022 MY Corolla [03/2019 - 09/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P0617; Starter Relay Circuit High+

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • After turning ignition 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.

    Click here 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2019]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2019 - 04/2020]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2021 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [04/2020 - 09/2022]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION

PROCEDURE

1.

CHECK WHETHER ENGINE CAN BE CRANKED

(a) Check if the engine can be cranked.

Result

Proceed to

Engine cannot be cranked

A

Engine can be cranked

B

B

GO TO STEP 21

A

2.

READ VALUE USING TECHSTREAM (STARTER SIGNAL)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.

Powertrain > Engine and ECT > Data List

Tester Display

Starter Signal

(e) Check the result when the ignition switch is ON and the engine starts.

OK:

Condition

Starter Signal

Ignition switch ON

OFF

Cranking position

ON

Result

Proceed to

NG (for CVT models)

A

NG (for Manual Transaxle models)

B

OK

C

B

GO TO STEP 9

C

GO TO STEP 13

A

3.

INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

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

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

Result

Proceed to

OK (w/ Smart Key System)

A

OK (w/o Smart Key System)

B

NG

C

B

GO TO STEP 6

C

REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY 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

A

4.

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

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

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

(c) Disconnect the ECM connector.

(d) 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) - A46-23 (NSW)

Always

Below 1 Ω

O62-2 (STAR), C62-4 (B) or A46-23 (NSW) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (STA SIGNAL CIRCUIT)

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

(b) Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(c) Disconnect the ECM connector.

(d) Disconnect the certification ECU (smart key ECU assembly) connector.

(e) 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

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

Always

Below 1 Ω

A46-29 (STA) - 1 (ST relay)

Always

Below 1 Ω

O62-1 (STA), 1 (ST relay), C62-9 (L) or A46-29 (STA) - Body ground and other terminals

Always

10 kΩ or higher

OK

GO TO SMART KEY SYSTEM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

INSPECT IGNITION OR STARTER SWITCH ASSEMBLY

(a) Inspect the ignition or starter switch assembly.

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

NG

REPLACE IGNITION OR STARTER SWITCH ASSEMBLY

OK

7.

CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM)

(a) Disconnect the ignition or starter switch assembly connector.

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

(c) Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I12-5 (ST1) - C62-4 (B)

Always

Below 1 Ω

I12-5 (ST1) - A46-23 (NSW)

Always

Below 1 Ω

I12-5 (ST1), C62-4 (B) or A46-23 (NSW) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

CHECK HARNESS AND CONNECTOR (STA SIGNAL CIRCUIT)

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

(b) Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(c) Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

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

Always

Below 1 Ω

A46-29 (STA) - 1 (ST relay)

Always

Below 1 Ω

C62-9 (L), 1 (ST relay) or A46-29 (STA) - Body ground and other terminals

Always

10 kΩ or higher

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION OR STARTER SWITCH ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.

INSPECT CLUTCH START SWITCH ASSEMBLY

(a) Inspect the clutch start switch assembly.

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

NG

REPLACE CLUTCH START SWITCH ASSEMBLY

OK

10.

INSPECT IGNITION OR STARTER SWITCH ASSEMBLY

(a) Inspect the ignition or starter switch assembly.

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

NG

REPLACE IGNITION OR STARTER SWITCH ASSEMBLY

OK

11.

CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - CLUTCH START SWITCH ASSEMBLY - ECM)

(a) Disconnect the ignition or starter switch assembly connector.

(b) Disconnect the clutch start switch assembly connector.

(c) Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I12-5 (ST1) - A60-2

Always

Below 1 Ω

I12-5 (ST1) - A46-23 (NSW)

Always

Below 1 Ω

I12-5 (ST1), A60-2 or A46-23 (NSW) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

12.

CHECK HARNESS AND CONNECTOR (STA SIGNAL CIRCUIT)

(a) Disconnect the clutch start switch assembly connector.

(b) Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(c) Disconnect the ECM connector.

(d) 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

A46-29 (STA) - 1 (ST relay)

Always

Below 1 Ω

A60-1, 1 (ST relay) or A46-29 (STA) - Body ground and other terminals

Always

10 kΩ or higher

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION OR STARTER SWITCH ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.

INSPECT ST RELAY

(a) Inspect the ST relay.

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

NG

REPLACE ST RELAY

OK

14.

INSPECT STARTER ASSEMBLY

(a) Inspect the starter assembly.

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

NG

REPLACE STARTER ASSEMBLY 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

OK

15.

CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER ASSEMBLY)

(a) Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Disconnect the starter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 (ST relay) - C82-1 (ST)

Always

Below 1 Ω

3 (ST relay) or C82-1 (ST) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

16.

CHECK HARNESS AND CONNECTOR (BATTERY - STARTER ASSEMBLY)

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Disconnect the cable from the positive (+) battery terminal.

(c) Disconnect the starter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Positive (+) battery terminal - C111-1 (B)

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - STARTER ASSEMBLY)

OK

17.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF ST RELAY)

(a) Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.

*1

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

*2

ST Relay

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

5 (ST relay) - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ST RELAY)

OK

18.

CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)

(a) Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2 (ST relay) - Body ground

Always

Below 1 Ω

Result

Proceed to

OK (for CVT models)

A

OK (for Manual Transaxle models)

B

NG

C

B

GO TO STEP 20

C

REPAIR OR REPLACE HARNESS OR CONNECTOR

A

19.

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

(a) Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Disconnect the 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

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

Always

Below 1 Ω

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

20.

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

(a) Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Disconnect the clutch start switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (ST relay) - A60-1

Always

Below 1 Ω

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

21.

READ VALUE USING TECHSTREAM (STARTER SIGNAL)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.

Powertrain > Engine and ECT > Data List

Tester Display

Starter Signal

(e) Check the result when the ignition switch is ON and the engine starts.

OK:

Condition

Starter Signal

Ignition switch ON

OFF

Cranking position

ON

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - ECM)