Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Starter Signal Circuit

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / M20a-fks (engine Control) / Sfi System / 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

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

GO TO STEP 17

A

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

A

3.

CHECK STOP AND START SYSTEM

Click here

NG

REPAIR STOP AND START SYSTEM
OK

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

A

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
OK

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

OK

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
OK

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
OK

11.

INSPECT STARTER ASSEMBLY

Click here

NG

REPLACE STARTER ASSEMBLY

OK

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
OK

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
OK

14.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF ST RELAY)

*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)
OK

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
OK

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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