Toyota Corolla Cross: 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 and to terminal STA of the ECM (STA signal).
*1: w/o Smart Key System
*2: w/ Smart Key System
WIRING DIAGRAM
Refer to DTC P061512.
Click here .gif)
CAUTION / NOTICE / HINT
NOTICE:
- 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 (-) auxiliary battery terminal.
Click here
- When disconnecting and reconnecting the auxiliary battery.
Click here
HINT:
When disconnecting and reconnecting the auxiliary 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 |
.gif) | GO TO STEP 17 |
|
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| 2. |
READ VALUE USING GTS (STARTER SW) |
(a) Enter the following menus.
Powertrain > Engine > Data List|
Tester Display |
|---|
| Starter SW |
(b) Check the value displayed on the GTS when the ignition switch is turned to the ON and START positions.
OK:
|
Condition | GTS Display (Starter SW) |
|---|---|
|
Ignition switch ON | OFF |
|
Engine started | ON |
|
Result | Proceed to |
|---|---|
|
NG | A |
|
OK | B |
| B |
| GO TO STEP 10 |
|
| 3. |
CHECK STOP AND START SYSTEM |
Click here
| NG | |
REPAIR STOP AND START SYSTEM |
|
| 4. |
INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY |
for 2WD: Click here
for AWD: Click here
|
Result | Proceed to |
|---|---|
|
OK (w/ Smart Key System) |
A |
| OK (w/o Smart Key System) |
B |
| NG |
C |
| B |
| GO TO STEP 7 |
| C |
| REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY for 2WD: Click here for AWD: Click here
|
|
| 5. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ENGINE STOP AND START ECU - PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM) |
(a) Disconnect the certification ECU (smart key ECU assembly) connector.
(b) Disconnect the engine stop and start ECU connector.
(c) Disconnect the park/neutral position switch assembly connector.
(d) Disconnect the ECM connector.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
I223-10 (STAR) - C62-4 (B) |
Always | Below 1 Ω |
|
I223-10 (STAR) - A47-23 (NSW) |
Always | Below 1 Ω |
|
I223-10 (STAR) - A169-17 (CLL) |
Always | Below 1 Ω |
|
I223-10 (STAR), C62-4 (B), A169-17 (CLL) or A47-23 (NSW) - Body ground and other terminals |
Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 6. |
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 assembly.
(c) Disconnect the ECM connector.
(d) Disconnect the engine stop and start ECU connector.
(e) Disconnect the certification ECU (smart key ECU assembly) connector.
(f) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
I223-3 (STA) - 2 (ST relay) |
Always | Below 1 Ω |
|
C62-5 (L) - 2 (ST relay) |
Always | Below 1 Ω |
|
A47-30 (STA) - 2 (ST relay) |
Always | Below 1 Ω |
|
A169-21 (STA) - 2 (ST relay) |
Always | Below 1 Ω |
|
I223-3 (STA), 2 (ST relay), C62-5 (L), A47-30 (STA) or A169-21 (STA) - Body ground and other terminals |
Always | 10 kΩ or higher |
| OK | | GO TO SMART KEY SYSTEM |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 7. |
INSPECT IGNITION OR STARTER SWITCH ASSEMBLY |
Click here
| NG | | REPLACE IGNITION OR STARTER SWITCH ASSEMBLY |
|
| 8. |
CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ENGINE STOP AND START ECU - 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) Disconnect the engine stop and start ECU connector.
(e) 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) - A47-23 (NSW) |
Always | Below 1 Ω |
|
I12-5 (ST1) - A169-17 (CLL) |
Always | Below 1 Ω |
|
I12-5 (ST1), C62-4 (B), A169-17 (CLL) or A47-23 (NSW) - Body ground and other terminals |
Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 9. |
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 assembly.
(c) Disconnect the ECM connector.
(d) Disconnect the engine stop and start ECU connector.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
C62-5 (L) - 2 (ST relay) |
Always | Below 1 Ω |
|
A47-30 (STA) - 2 (ST relay) |
Always | Below 1 Ω |
|
A169-21 (STA) - 2 (ST relay) |
Always | Below 1 Ω |
|
C62-5 (L), 2 (ST relay), A169-21 (STA) or A47-30 (STA) - Body ground and other terminals |
Always | 10 kΩ or higher |
| OK | | REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - IGNITION OR STARTER SWITCH ASSEMBLY) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 10. |
INSPECT ST RELAY |
Click here
| NG | |
REPLACE ST RELAY |
|
| 11. |
INSPECT STARTER ASSEMBLY |
Click here
| NG | |
REPLACE STARTER ASSEMBLY |
|
| 12. |
CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER ASSEMBLY) |
(a) Remove the ST relay from the No. 1 engine room relay 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) - C132-2 (ST) |
Always | Below 1 Ω |
|
3 (ST relay) or C132-2 (ST) - Body ground and other terminals |
Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 13. |
CHECK TERMINAL VOLTAGE (AUXILIARY BATTERY - STARTER ASSEMBLY) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the cable from the positive (+) auxiliary 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 (+) auxiliary battery terminal - C111-1 (B) |
Always | Below 1 Ω |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 14. |
CHECK TERMINAL VOLTAGE (POWER SOURCE OF ST RELAY) |
.png)
|
*1 | No. 1 Engine Room Relay Block Assembly |
|
*2 | ST Relay |
(a) Remove the ST relay from the No. 1 engine room relay 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 (AUXILIARY BATTERY - ST RELAY) |
|
| 15. |
CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND) |
(a) Remove the ST relay from the No. 1 engine room relay 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 |
|
| 16. |
CHECK HARNESS AND CONNECTOR (ST RELAY - PARK/NEUTRAL POSITION SWITCH ASSEMBLY) |
(a) Remove the ST relay from the No. 1 engine room relay 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 |
|---|---|---|
|
2 (ST relay) - C62-5 (L) |
Always | Below 1 Ω |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 17. |
READ VALUE USING GTS (STARTER SW) |
(a) Enter the following menus.
Powertrain > Engine > Data List|
Tester Display |
|---|
| Starter SW |
(b) Check the value displayed on the GTS when the ignition switch is turned to the ON and START positions.
OK:
|
Condition | GTS Display (Starter SW) |
|---|---|
|
Ignition switch ON | OFF |
|
Engine started | ON |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - ECM) |
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