Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001KNEB
Model Year Start: 2020 Model: RAV4 Prod Date Range: [10/2019 - 08/2020]
Title: STOP AND START: STOP AND START SYSTEM: Starter Signal Circuit; 2020 MY RAV4 [10/2019 - 08/2020]

Starter Signal Circuit

DESCRIPTION

By using the starter delay circuit, the engine stop and start ECU can activate the ST NO. 2 relay (for starter motor operation) after activating the ST NO. 1 relay (for starter pinion operation) to operate the starter assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU.

    Click here 2020 - 2021 MY RAV4 [10/2019 - 12/2021]; STOP AND START: STOP AND START SYSTEM: REGISTRATION

  • After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU.

    Click here 2020 - 2021 MY RAV4 [10/2019 - 12/2021]; STOP AND START: STOP AND START SYSTEM: REGISTRATION

  • After replacing the engine stop and start ECU or airbag ECU assembly, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU.

    Click here 2020 - 2021 MY RAV4 [10/2019 - 12/2021]; STOP AND START: STOP AND START SYSTEM: REGISTRATION

  • When the engine stop and start ECU or oil pump with solenoid assembly is replaced, check the oil pump with solenoid assembly.

    Click here 2020 - 2021 MY RAV4 [10/2019 - 12/2021]; STOP AND START: STOP AND START SYSTEM: REGISTRATION

  • After replacing the starter assembly, perform initialization of the number of starter operations stored in the engine stop and start ECU.

    Click here 2020 - 2021 MY RAV4 [10/2019 - 12/2021]; STOP AND START: STOP AND START SYSTEM: REGISTRATION

  • When the starter assembly is replaced, "ST NO. 1 relay" and "ST NO. 2 relay" must be also replaced.
  • After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION

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

PROCEDURE

1.

CHECK CRANKING

(a) Turn the ignition switch to START and check that the engine cranks.

Result

Proceed to

Engine cranks

A

Engine does not crank

B

B

GO TO STEP 7

A

2.

PERFORM ACTIVE TEST USING TECHSTREAM (STARTER(HOOD CLOSE))

(a) Check that the engine hood is closed.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Stop and Start / Active Test / Starter(Hood Close).

Powertrain > Stop and Start > Active Test

Tester Display

Starter(Hood Close)

(f) Check whether the engine cranks while the Active Test "Starter(Hood Close)" is being performed.

NOTICE:

The Active Test "Starter(Hood Close)" is stopped automatically 3 seconds after the starter assembly begins operating.

Standard:

Engine cranks

OK

GO TO DTC P160300 (CONFIRM CAUSE OF ENGINE STALL)

NG

3.

CHECK HARNESS AND CONNECTOR (BIN1 AND BIN2 TERMINALS POWER SOURCE CIRCUIT)

*a

Front view of wire harness connector

(to Engine Stop and Start ECU)

(a) Disconnect the engine stop and start ECU connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A33-1 (BIN2) - Body ground

Always

9.5 to 14 V

A33-3 (BIN1) - Body ground

Always

9.5 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE STOP AND START ECU - BATTERY)

OK

4.

CHECK HARNESS AND CONNECTOR (IG1 TERMINAL POWER SOURCE CIRCUIT)

*a

Front view of wire harness connector

(to Engine Stop and Start ECU)

(a) Disconnect the engine stop and start ECU connector.

(b) Turn the ignition switch to ON.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A32-21 (IG1) - Body ground

Ignition switch ON

9.5 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE STOP AND START ECU - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 NO. 1 RELAY))

OK

5.

CHECK HARNESS AND CONNECTOR (+B AND IG2 TERMINALS POWER SOURCE CIRCUIT)

*a

Front view of wire harness connector

(to Engine Stop and Start ECU)

-

-

(a) Disconnect the engine stop and start ECU connectors.

(b) Turn the ignition switch to ON.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A34-1 (+B) - Body ground

Ignition switch ON

9.5 to 14 V

A32-18 (IG2) - Body ground

Ignition switch ON

9.5 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE STOP AND START ECU - EFI-MAIN NO. 1 RELAY OR INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG2 NO. 2 RELAY))

OK

6.

CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND)

(a) Disconnect the engine stop and start ECU connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A33-2 (GND2) - Body ground

Always

Below 1 Ω

A33-8 (GND1) - Body ground

Always

Below 1 Ω

A34-6 (DGND) - Body ground

Always

Below 1 Ω

OK

REPLACE ENGINE STOP AND START ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

PERFORM ACTIVE TEST USING TECHSTREAM (STARTER (HOOD CLOSE))

(a) Check that the engine hood is closed.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Stop and Start / Active Test / Starter(Hood Close).

Powertrain > Stop and Start > Active Test

Tester Display

Starter(Hood Close)

(f) Check whether the engine cranks while the Active Test "Starter(Hood Close)" is being performed.

NOTICE:

The Active Test "Starter(Hood Close)" is stopped automatically 3 seconds after the starter assembly begins operating.

Standard:

Engine cranks

Result

Proceed to

Engine cranks

A

Engine does not crank

B

B

GO TO STEP 17

A

8.

READ VALUE USING TECHSTREAM (NEUTRAL SWITCH)

(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 / Stop and Start / Data List / Neutral Switch.

Powertrain > Stop and Start > Data List

Tester Display

Neutral Switch

(e) In accordance with the display on the Techstream, read the Data List.

OK:

Techstream Display

Condition

Normal Condition

Neutral Switch

Shift lever in P or N

ON

Shift lever not in P or N

OFF

Result

Proceed to

NG

A

OK (w/ Smart Key System)

B

OK (w/o Smart Key System)

C

B

GO TO STEP 12

C

GO TO STEP 14

A

9.

INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

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

  • for 2WD:

    Click here 2019 - 2024 MY RAV4 [11/2018 -        ]; UB80E (AUTOMATIC TRANSMISSION / TRANSAXLE): PARK / NEUTRAL POSITION SWITCH: INSPECTION

  • for AWD:

    Click here 2019 - 2024 MY RAV4 [11/2018 -        ]; UB80F (AUTOMATIC TRANSMISSION / TRANSAXLE): PARK / NEUTRAL POSITION SWITCH: INSPECTION

Result

Proceed to

OK (w/ Smart Key System)

A

OK (w/o Smart Key System)

B

NG

C

B

GO TO STEP 11

C

REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY

  • for 2WD:

    Click here 2020 MY RAV4 [10/2019 - 08/2020]; UB80E (AUTOMATIC TRANSMISSION / TRANSAXLE): PARK / NEUTRAL POSITION SWITCH: REMOVAL

  • for AWD:

    Click here 2020 MY RAV4 [10/2019 - 08/2020]; UB80F (AUTOMATIC TRANSMISSION / TRANSAXLE): PARK / NEUTRAL POSITION SWITCH: REMOVAL

A

10.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST NO. 1 RELAY)

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

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

(c) Disconnect the engine stop and start ECU 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

A15-9 (STAR) - 2 (ST NO. 1 relay)

Shift lever in P or N

Below 1 Ω

Shift lever not in P or N

10 kΩ or higher

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.

CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - ST NO. 1 RELAY)

(a) Disconnect the ignition or starter switch assembly connector.

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

(c) Disconnect the engine stop and start ECU 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

G28-5 (ST1) - 2 (ST NO. 1 relay)

Shift lever in P or N

Below 1 Ω

Shift lever not in P or N

10 kΩ or higher

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.

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

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

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

(c) Disconnect the engine stop and start ECU 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

A15-9 (STAR) - C31-4 (B)

Always

Below 1 Ω

A15-9 (STAR) or C31-4 (B) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

13.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (STAR SIGNAL)

(a) Disconnect the engine stop and start ECU connector.

*a

Front view of wire harness connector

(to Engine Stop and Start ECU)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A34-17 (CLL) - Body ground

Engine start

9.5 to 14 V

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

GO TO SMART KEY SYSTEM

14.

INSPECT IGNITION OR STARTER SWITCH ASSEMBLY

(a) Inspect the ignition or starter switch assembly.

Click here 2019 - 2024 MY RAV4 [11/2018 -        ]; A25A-FKS (STARTING): IGNITION SWITCH: INSPECTION

NG

REPLACE IGNITION OR STARTER SWITCH ASSEMBLY

OK

15.

CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - BATTERY)

*a

Front view of wire harness connector

(to Ignition or Starter Switch Assembly)

(a) Disconnect the ignition or starter switch assembly connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

G28-7 (AM1) - Body ground

Always

9.5 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

16.

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

(a) Disconnect the ignition or starter switch assembly connector.

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

(c) Disconnect the engine stop and start ECU 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

G28-5 (ST1) - C31-4 (B)

Always

Below 1 Ω

G28-5 (ST1) or C31-4 (B) - Body ground and other terminals

Always

10 kΩ or higher

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

17.

CHECK ENGINE STOP AND START ECU (STA AND STA2 SIGNAL)

*a

Component with harness connected

(Engine Stop and Start ECU)

-

-

(a) Connect an oscilloscope to the STA, STA2 and DGND terminals of the engine stop and start ECU connector.

(b) Check the waveform immediately after turning the ignition switch START.

Item

Condition

Tester Connection

A34-21 (STA) - A34-6 (DGND)

A34-23 (STA2) - A34-6 (DGND)

Condition

Engine started by ignition switch operation

Result:

Result

Proceed to

Delay between ST NO. 1 relay turning on and ST NO. 2 relay turning on: between 0.03 and 0.06 seconds

A

Delay between ST NO. 1 relay turning on and ST NO. 2 relay turning on: not between 0.03 and 0.06 seconds

B

ST NO. 1 relay turns on and ST NO. 2 relay does not turn on

C

ST NO. 1 relay and ST NO. 2 relay do not turn on

D

NOTICE:

After replacing the engine stop and start ECU, make sure that the drive plate and ring gear sub-assembly and starter pinion gear are not excessively worn. A malfunction in the delay circuit may cause the drive plate and ring gear sub-assembly or starter pinion gear to be worn or damaged.

B

REPLACE ENGINE STOP AND START ECU

C

GO TO STEP 3

D

GO TO STEP 20

A

18.

INSPECT RELAY (ST NO. 1 RELAY AND ST NO. 2 RELAY)

(a) Inspect the STNO. 1 relay.

Click here 2019 - 2021 MY RAV4 [11/2018 - 12/2021]; A25A-FKS (STARTING): RELAY: INSPECTION+

(b) Inspect the ST NO. 2 relay.

Click here 2019 - 2021 MY RAV4 [11/2018 - 12/2021]; A25A-FKS (STARTING): RELAY: INSPECTION+

NG

REPLACE RELAY (ST NO. 1 RELAY OR ST NO. 2 RELAY)

OK

19.

CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY AND ST NO. 2 RELAY - BATTERY)

*1

No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly

*2

ST NO. 1 Relay

*3

ST NO. 2 Relay

(a) Remove the ST NO. 1 relay and ST NO. 2 relay from the 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 NO. 1 relay) - Body ground

Always

9.5 to 14 V

5 (ST NO. 2 relay) - Body ground

Always

9.5 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (ST NO. 1 RELAY OR ST NO. 2 RELAY - BATTERY)

OK

20.

CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY AND ST NO. 2 RELAY - STARTER ASSEMBLY)

(a) Remove the ST NO. 1 relay and ST NO. 2 relay from the 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 NO. 1 relay) - C43-2 (SL1)

Always

Below 1 Ω

3 (ST NO. 2 relay) - C43-1 (SL2)

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (ST NO. 1 RELAY OR ST NO. 2 RELAY - STARTER ASSEMBLY)

OK

21.

CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY AND ST NO. 2 RELAY - BODY GROUND)

(a) Remove the ST NO. 1 relay and ST NO. 2 relay from the 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 NO. 1 relay) - Body ground

Always

Below 1 Ω

1 (ST NO. 2 relay) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (ST NO. 1 RELAY OR ST NO. 2 RELAY - BODY GROUND)

OK

22.

CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ST NO. 1 RELAY)

(a) Disconnect the engine stop and start ECU connector.

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

(c) Disconnect the certification ECU (smart key ECU assembly) connector. (w/ Smart Key System)

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A34-21 (STA) - 2 (ST NO. 1 relay)

Always

Below 1 Ω

A34-21 (STA) or 2 (ST NO. 1 relay) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

23.

CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ST NO. 2 RELAY)

(a) Disconnect the engine stop and start ECU connector.

(b) Remove the ST NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(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

A34-23 (STA2) - 2 (ST NO. 2 relay)

Always

Below 1 Ω

A34-23 (STA2) or 2 (ST NO. 2 relay) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

24.

CHECK STARTER SIGNAL (OUTPUT WAVEFORM)

(a) Connect the positive (+) lead of an oscilloscope to the positive (+) battery terminal and the negative (-) lead to the negative (-) battery terminal.

(b) While cranking the engine, count the number of times the waveform drops.

Standard:

Waveform drops 2 times

Number of Times Waveform Dropped

Proceed to

0 times

A

2 times

B

B

GO TO STEP 28

A

25.

INSPECT STARTER INRUSH CURRENT REDUCTION RELAY

*1

Starter Assembly

*a

B Terminal

*b

M Terminal

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Disconnect terminals B and M of the starter inrush current reduction relay.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B Terminal - M Terminal

Always

Below 1 Ω

NG

GO TO STEP 27

OK

26.

INSPECT STARTER ASSEMBLY (WIRE HARNESS)

*1

Starter Assembly

*a

Inspect Part

*b

B Terminal

*c

C Terminal

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Disconnect terminal B of the starter inrush current reduction relay.

(c) Disconnect terminal C of the starter assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C Terminal - B Terminal

Always

Below 1 Ω

OK

REPLACE STARTER ASSEMBLY

NG

REPAIR OR REPLACE WIRE HARNESS

27.

INSPECT STARTER ASSEMBLY (M TERMINAL)

*1

Starter Assembly

*a

Inspect Part

*b

M Terminal

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Disconnect terminal M of the starter inrush current reduction relay.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M Terminal - Body ground

Always

Below 1 Ω

OK

REPLACE STARTER INRUSH CURRENT REDUCTION RELAY

NG

REPLACE STARTER ASSEMBLY

28.

INSPECT STARTER ASSEMBLY

(a) Inspect the starter assembly.

Click here 2019 - 2020 MY RAV4 [11/2018 - 08/2020]; A25A-FKS (STARTING): STARTER (w/ Stop And Start System): INSPECTION

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE STARTER ASSEMBLY