| Last Modified: 12-11-2024 | 6.11:8.1.0 | Doc ID: RM100000002PY8B |
| Model Year Start: 2025 | Model: GR Corolla | Prod Date Range: [09/2024 - ] |
| Title: G16E-GTS (ENGINE CONTROL): SFI SYSTEM: Starter Signal Circuit; 2025 MY GR Corolla [09/2024 - ] | ||
|
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*1 or park/neutral position switch assembly*2 and to terminal STA of the ECM (STA signal).
- *1: for M/T Models
- *2: for A/T Models
WIRING DIAGRAM
Refer to DTC P061512.
Click here
![2025 MY GR Corolla [09/2024 - ]; G16E-GTS (ENGINE CONTROL): SFI SYSTEM: P061512; Starter Relay Circuit Short to Battery+](/t3Portal/stylegraphics/info.gif)
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
-
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
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 |
|
|
|
2. |
READ VALUE USING GTS (STARTER SW) |
(a) Fully depress the clutch pedal. (for M/T Models)
(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 (for M/T Models) |
B |
|
NG (for A/T Models) |
C |
| B |
|
| C |
|
|
|
3. |
INSPECT ST RELAY |
Click here
| NG |
|
REPLACE ST RELAY |
|
|
4. |
INSPECT STARTER ASSEMBLY |
Click here
| NG |
|
|
|
5. |
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 |
|
|
6. |
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 |
|
|
7. |
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:
|
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ST RELAY) |
|
|
8. |
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 |
|
|
9. |
CHECK HARNESS AND CONNECTOR (ST RELAY - ECM) |
(a) Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2 (ST relay) - A139-30 (STA) |
Always |
Below 1 Ω |
| OK |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - STARTER ASSEMBLY) |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
10. |
INSPECT CLUTCH START SWITCH ASSEMBLY |
Click here
| NG |
|
|
|
11. |
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 |
|
|
12. |
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 |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
13. |
INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY |
Click here
| NG |
|
|
|
14. |
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 park/neutral position 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 |
|---|---|---|
|
C162-9 (L) - 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), C162-9 (L) or A139-30 (STA) - Body ground and other terminals |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
15. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - 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 |
|---|---|---|
|
O175-10 (STAR) - C162-4 (B) |
Always |
Below 1 Ω |
|
O175-10 (STAR) - A139-23 (NSW) |
Always |
Below 1 Ω |
|
O175-10 (STAR), A139-23 (NSW) or C162-4 (B) - Body ground and other terminals |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
16. |
READ VALUE USING GTS (STARTER SW) |
(a) Fully depress the clutch pedal. (for M/T Models)
(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) |
|
|