Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000255VU
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 -           ]
Title: G16E-GTS (ENGINE CONTROL): SFI SYSTEM: Starter Signal Circuit; 2023 - 2025 MY GR Corolla [09/2022 -        ]

Starter Signal Circuit

DESCRIPTION

While the engine is being cranked, current flows from terminal STAR of the certification ECU (smart key ECU assembly) to the clutch start switch assembly and to terminal STA of the ECM (STA signal).

WIRING DIAGRAM

Refer to DTC P061512.

Click here 2023 - 2025 MY GR Corolla [09/2022 -        ]; G16E-GTS (ENGINE CONTROL): SFI SYSTEM: P061512; Starter Relay Circuit Short to Battery+

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) battery terminal.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: BEFORE DISCONNECTING BATTERY

  • When disconnecting and reconnecting the battery.

    HINT:

    When disconnecting and reconnecting the battery, there is an automatic learning function that completes learning when the respective system is used.

    Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: AUTOMATIC LEARNING CHART 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: AUTOMATIC LEARNING CHART

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 13

A

2.

READ VALUE USING GTS (STARTER SW)

(a) Fully depress the clutch pedal.

(b) Check the value displayed on the GTS when the ignition switch is turned to ON and START positions.

Powertrain > Engine > Data List

Tester Display

Starter SW

OK:

Condition

GTS Display (Starter SW)

Ignition switch ON

OFF

Engine started

ON
OK

GO TO STEP 6

NG

3.

INSPECT CLUTCH START SWITCH ASSEMBLY

Click here 2020 - 2023 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 11/2022]; CLUTCH: CLUTCH PEDAL SWITCH: INSPECTION 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; CLUTCH: CLUTCH PEDAL SWITCH: INSPECTION

NG

REPLACE CLUTCH START SWITCH ASSEMBLY 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]; CLUTCH: CLUTCH PEDAL: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; CLUTCH: CLUTCH PEDAL: REMOVAL

OK

4.

CHECK HARNESS AND CONNECTOR (STA SIGNAL CIRCUIT)

(a) Disconnect the ECM connector.

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

(c) Disconnect the clutch start switch assembly 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

A177-1 - 2 (ST relay)

Always

Below 1 Ω

A139-30 (STA) - 2 (ST relay)

Always

Below 1 Ω

O175-3 (STA) - 2 (ST relay)

Always

Below 1 Ω

O175-3 (STA), 2 (ST relay), A177-1 or A139-30 (STA) - Body ground and other terminals

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - CLUTCH START SWITCH ASSEMBLY - ECM)

(a) Disconnect the certification ECU (smart key ECU 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

O175-10 (STAR) - A177-2

Always

Below 1 Ω

O175-10 (STAR) - A139-23 (NSW)

Always

Below 1 Ω

O175-10 (STAR), A139-23 (NSW) or A177-2 - Body ground and other terminals

Always

10 kΩ or higher
OK

GO TO SMART KEY SYSTEM 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function (Gasoline Model, except TMMMS Made)): HOW TO PROCEED WITH TROUBLESHOOTING 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

INSPECT ST RELAY

Click here 2023 - 2025 MY GR Corolla [09/2022 -        ]; G16E-GTS (STARTING): RELAY: INSPECTION

NG

REPLACE ST RELAY
OK

7.

INSPECT STARTER ASSEMBLY

Click here 2023 - 2025 MY GR Corolla [09/2022 -        ]; G16E-GTS (STARTING): STARTER: INSPECTION

NG

REPLACE STARTER ASSEMBLY 2023 MY GR Corolla [09/2022 - 11/2022]; G16E-GTS (STARTING): STARTER: REMOVAL 2023 - 2025 MY GR Corolla [11/2022 -        ]; G16E-GTS (STARTING): STARTER: REMOVAL

OK

8.

CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER ASSEMBLY)

(a) Remove the ST relay from 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

9.

CHECK TERMINAL VOLTAGE (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
OK

10.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF ST RELAY)

(a) Remove the ST relay from 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

5 (ST relay) - Body ground

Always

11 to 14 V
NG

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

11.

CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)

(a) Remove the ST relay from 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

1 (ST relay) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

12.

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

2 (ST relay) - A177-1

Always

Below 1 Ω
OK

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.

READ VALUE USING GTS (STARTER SW)

(a) Fully depress the clutch pedal.

(b) Check the value displayed on the GTS when the ignition switch is turned to ON and START positions.

Powertrain > Engine > Data List

Tester Display

Starter SW

OK:

Condition

GTS Display (Starter SW)

Ignition switch ON

OFF

Engine started

ON

Result

Proceed to

OK

A

NG

B
A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

B

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