Last Modified: 11-20-2023 6.11:8.1.0 Doc ID: RM10000000138LR
Model Year Start: 2018 Model: Camry Prod Date Range: [03/2017 - 03/2020]
Title: A25A-FKS (ENGINE CONTROL): SFI SYSTEM: Starter Signal Circuit; 2018 - 2020 MY Camry [03/2017 - 03/2020]

Starter Signal Circuit

DESCRIPTION

While the engine is being cranked, current flows from terminal ST1 of the ignition 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 2018 MY Camry [03/2017 - 06/2017]; A25A-FKS (ENGINE CONTROL): SFI SYSTEM: P061512; Starter Relay Circuit Short to Battery+ 2018 - 2020 MY Camry [06/2017 - 03/2020]; A25A-FKS (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.

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 16

A

2.

READ VALUE USING TECHSTREAM (STARTER SW)

(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 / Data List / Starter SW.

Powertrain > Engine > Data List

Tester Display

Starter SW

(e) Check the value displayed on the Techstream when the ignition switch is turned to ON and the engine is cranked.

OK:

Condition

Techstream Display (Starter SW)

Ignition switch ON

OFF

Cranking position

ON
NG

GO TO STEP 10

OK

3.

INSPECT RELAY (ST RELAY)

(a) Inspect the ST relay.

Click here 2018 - 2024 MY Camry [03/2017 -        ]; A25A-FKS (STARTING): RELAY: INSPECTION

NG

REPLACE RELAY (ST RELAY)
OK

4.

INSPECT STARTER ASSEMBLY

(a) Inspect the starter assembly.

Click here 2018 - 2024 MY Camry [03/2017 -        ]; A25A-FKS (STARTING): STARTER: INSPECTION

NG

REPLACE STARTER ASSEMBLY 2018 MY Camry [03/2017 - 06/2017]; A25A-FKS (STARTING): STARTER: REMOVAL 2018 - 2020 MY Camry [06/2017 - 10/2020]; A25A-FKS (STARTING): STARTER: REMOVAL

OK

5.

CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER ASSEMBLY)

(a) Remove the ST relay from the engine room relay block and 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) - C61-1

Always

Below 1 Ω

3 (ST relay) or C61-1 - Body ground and other terminals

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)

(a) Remove the ST relay from the engine room relay block and 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

7.

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 - D1-1

Always

Below 1 Ω

Result

Proceed to

OK (w/o Smart Key System)

A

OK (w/ Smart Key System)

B

NG

C
B

GO TO STEP 9

C

REPAIR OR REPLACE HARNESS OR CONNECTOR
A

8.

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

(a) Remove the ST relay from the engine room relay block and 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

C55-9 (L) - 2 (ST relay)

Always

Below 1 Ω
OK

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.

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

(a) Remove the ST relay from the engine room relay block and junction block assembly.

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

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C55-9 (L) - 2 (ST relay)

Always

Below 1 Ω

A13-20 (STA) - 2 (ST relay)

Always

Below 1 Ω
OK

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.

INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

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

Click here 2018 - 2024 MY Camry [03/2017 -        ]; UB80E (AUTOMATIC TRANSMISSION / TRANSAXLE): PARK / NEUTRAL POSITION SWITCH: INSPECTION

Result

Proceed to

OK (w/o Smart Key System)

A

OK (w/ Smart Key System)

B

NG

C
B

GO TO STEP 14

C

REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY 2018 MY Camry [03/2017 - 06/2017]; UB80E (AUTOMATIC TRANSMISSION / TRANSAXLE): PARK / NEUTRAL POSITION SWITCH: REMOVAL 2018 - 2020 MY Camry [06/2017 - 10/2020]; UB80E (AUTOMATIC TRANSMISSION / TRANSAXLE): PARK / NEUTRAL POSITION SWITCH: REMOVAL

A

11.

INSPECT IGNITION SWITCH ASSEMBLY

(a) Inspect the ignition switch assembly.

Click here 2018 - 2024 MY Camry [03/2017 -        ]; A25A-FKS (STARTING): IGNITION SWITCH: INSPECTION

NG

REPLACE IGNITION SWITCH ASSEMBLY

OK

12.

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

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

(b) Disconnect the ignition 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

K30-5 (ST1) - C55-4 (B)

Always

Below 1 Ω

K30-5 (ST1) - A24-23 (NSW)

Always

Below 1 Ω

K30-5 (ST1), C55-4 (B) or A24-23 (NSW) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

13.

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

(a) Remove the ST relay from the engine room relay block and junction block assembly.

(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

2 (ST relay) - C55-9 (L)

Always

Below 1 Ω

2 (ST relay), C55-9 (L) or A24-30 (STA) - Body ground

Always

10 kΩ or higher
OK

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.

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

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

(b) Disconnect the ECM connector.

(c) Remove the ST relay from the engine room relay block and junction block assembly.

(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

C55-9 (L) - A24-30 (STA)

Always

Below 1 Ω

C55-9 (L), A24-30 (STA), 2 (ST relay) or A13-20 (STA) - Body ground and other terminals

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

15.

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

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

(b) Disconnect the certification ECU (smart key ECU 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

A13-9 (STAR) - C55-4 (B)

Always

Below 1 Ω

A13-9 (STAR) - A24-23 (NSW)

Always

Below 1 Ω

A13-9 (STAR), C55-4 (B) or A24-23 (NSW) - Body ground and other terminals

Always

10 kΩ or higher
OK

GO TO SMART KEY SYSTEM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

16.

READ VALUE USING TECHSTREAM (STARTER SW)

(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 / Data List / Starter SW.

Powertrain > Engine > Data List

Tester Display

Starter SW

(e) Check the value displayed on the Techstream when the ignition switch is turned to ON and the engine is cranked.

OK:

Condition

Techstream Display (Starter SW)

Ignition switch ON

OFF

Cranking position

ON
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 2018 MY Camry [03/2017 - 06/2017]; A25A-FKS (ENGINE CONTROL): SFI SYSTEM: PROBLEM SYMPTOMS TABLE 2018 MY Camry [06/2017 - 08/2018]; A25A-FKS (ENGINE CONTROL): SFI SYSTEM: PROBLEM SYMPTOMS TABLE 2019 MY Camry [08/2018 - 09/2019]; A25A-FKS (ENGINE CONTROL): SFI SYSTEM: PROBLEM SYMPTOMS TABLE 2020 MY Camry [09/2019 - 03/2020]; A25A-FKS (ENGINE CONTROL): SFI SYSTEM: PROBLEM SYMPTOMS TABLE

NG

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