Toyota Yaris: Stop And Start System / Backup Boost Converter Circuit

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Engine & Hybrid System / Stop And Start / Stop And Start System / Backup Boost Converter Circuit

DESCRIPTION

A backup boost converter is built into the engine stop and start ECU. The backup boost converter helps maintain the power source voltage when the engine is restarted by stop and start control.

This prevents various functions such as the audio and visual system from malfunctioning if the power source voltage drops due to the auxiliary battery voltage dropping when the engine is restarted by stop and start control.

If any DTCs are output, troubleshoot the DTCs first.

HINT:

A relay function and fuse function are provided in the backup boost converter.

If there is a malfunction in any of the electrical system circuits connected to the backup boost converter, the fuse and relay functions shut off the malfunctioning circuit to protect other circuits (remains shut off until next trip).

When the electrical system circuit is shut off, power to the circuit is cut off, causing any systems connected to the circuit to be disabled.

The fuse function is reset* when the ignition switch is turned off. If the malfunction still exists in the electrical system circuit that has been shut off by the relay function, it will be shut off again by the relay and fuse functions the next time the ignition switch is turned to ON.

*: A semiconductor fuse self resets according to electric signal.

The backup boost converter supplies power to:
  • Meter / gauge system
  • Power steering system
  • Headup display system
  • Toyota Safety Sense
  • Air conditioning system
  • Electronically controlled brake system

WIRING DIAGRAM

Refer to DTC P323A19.

Click here

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

  • After replacing the engine stop and start ECU, perform learning of the external backup boost converter (eco run vehicle converter assembly).

    Click here

  • 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

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

    Click here

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

HINT:

For wire harness and connector inspection procedures and precautions, refer to " "

PROCEDURE

1.

CHECK PROBLEM SYMPTOMS

(a) Determine the trouble area by referring to the table below.

Effect on Vehicle

Trouble Area/Cause

Fail-safe

DTC Output

Stop and start cancel indicator

Symptom

Proceed to

When the engine is restarted by stop and start control:

The following symptoms may occur

  • The combination meter assembly fades out
  • The steering wheel feels heavy when the engine is restarted*

Backup boost converter internal malfunction

  • Internal power source malfunction
  • Internal power source overvoltage
  • Duty error
  • Communication cycle error

Stop and start control prohibited

P323A00

P323AA2

P323B29

P323B38

Blinks

Converter output voltage cannot be boosted when the engine is restarted

A

Auxiliary battery voltage drop

Systems on the converter output side do not operate

B43 terminal: Headup display system will not operate

IG12 terminal: Meter / gauge system

IG31 terminal: Both of the following will not operate

  • Power steering system
  • Electronically controlled brake system

IG41 terminal: All of the following will not operate

  • Headup display system
  • Toyota Safety Sense
  • Air conditioning system

Overcurrent applied to an output terminal (output terminal relay circuit is shutoff)

Stop and start control is prohibited

(Connected ECUs or sensors may detect power source malfunction DTCs)

P323A19

Blinks

Systems do not operate as power supply from the converter is cut off

A

Systems do not operate

(Due to converter input side malfunction)

IGR terminal: All of the following will not operate

  • Power steering system
  • Headup display system
  • Air conditioning system
  • Toyota Safety Sense
  • Electronically controlled brake system

IGP terminal: The meter / gauge system will not operate

Converter input circuit malfunction

  • Open or short to GND in IGR circuit
  • Open or short to GND in IGP circuit

Stop and start control prohibited

-

Does not blink (Blinks when communication error DTCs are stored)

Systems do not operate as power supply from the converter is cut off

B

Systems on the converter output side do not operate (varies depending on the malfunctioning relay circuit the converter detected)

IG12 terminal: The meter / gauge system will not operate

IG31 terminal: All of the following will not operate

  • Power steering system
  • Electronically controlled brake system

IG41 terminal: All of the following will not operate

  • Headup display system
  • Air conditioning system
  • Toyota Safety Sense

B43 terminal: Headup display system will not operate

Malfunction in circuits the converter supplies power to

(between the converter and ECUs or sensors)

Related systems do not operate as the relay circuit in the converter is turned off

-

Does not blink (Blinks when communication error DTCs are stored)

Systems do not operate as power supply from the converter is cut off

B

All of the following systems do not operate

  • Power steering system
  • Electronically controlled brake system
  • Headup display system
  • Air conditioning system
  • Toyota Safety Sense
  • Meter / gauge system
  • Open in BBC fuse circuit
  • Short in converter circuit
  • Backup boost converter malfunction

Stop and start control prohibited

P061519

Does not blink (Due to disabled meter / gauge system)

All systems that the converter supplies power to do not operate (see circuit diagram)

A

P30DF62

P30EF4B

P323A00

P323A16

P323AA2

P323B29

P323B38

The external backup boost converter (eco run vehicle converter assembly) output side system does not operate

  • Active noise control system
  • Open in BBC NO. 3 fuse circuit
  • Malfunction in circuits the converter supplies power to
  • External backup boost converter (eco run vehicle converter assembly) malfunction

-

-

Does not blink

All systems that the converter supplies power to do not operate (see circuit diagram)

C
  • The combination meter assembly cannot be turned off (short between IG12 and +B)
  • Communication error DTCs may be stored due to short between AC42 and +B

HINT:

Varies depending on the number of times an open occurs in the +B circuit

Converter circuit malfunction

  • Short between IG12 and +B
  • Short between AC42 and +B

-

-

Does not blink

The converter cannot shut off the power source when the ignition switch is turned off

B
  • Ignition switch cannot be turned off from ACC (short between ACC and +B)
  • Ignition switch cannot be turned off from ON (short between IG1 or IG2 and +B)

Engine stop and start ECU power source circuit malfunction

  • Short between ACC and +B
  • Short between IG1 and +B
  • Short between IG2 and +B

-

-

Does not blink
  • Ignition switch does not turn ACC
  • Ignition switch cannot be turned off

B
  • *: A DTC may be stored in the power steering system
A

GO TO DIAGNOSTIC TROUBLE CODE CHART

C

GO TO STEP 6

B

2.

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

(a) Disconnect the A66 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

A66-1 (BIN2) - Body ground

Always

9.5 to 14 V

A66-3 (BIN1) - Body ground

Always

9.5 to 14 V
NG

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

3.

CHECK HARNESS AND CONNECTOR (IGR AND IGP TERMINALS POWER SOURCE CIRCUIT)

(a) Disconnect the H43 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

Switch Condition

Specified Condition

H43-21 (IGR) - Body ground

Ignition switch ON

9.5 to 14 V

H43-18 (IGP) - Body ground

Ignition switch ON

9.5 to 14 V

(d) Turn the ignition switch to off.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

H43-21 (IGR) - Body ground

Ignition switch off

0 to 1 V

H43-18 (IGP) - Body ground

Ignition switch off

0 to 1 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - EACH ECU OR SENSOR)

(a) Disconnect the connector from the corresponding system ECU/sensor.

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

Standard Resistance:

Meter Mirror Sub-assembly (w/ Headup Display)

Tester Connection

Condition

Specified Condition

H43-11 (B43) - H61-2 (B)

Always

Below 1 Ω

H43-3 (IG41) - H61-1 (IG)

Always

Below 1 Ω

H43-11 (B43) - Body ground and other terminals

Always

10 kΩ or higher

H61-2 (B) - Body ground and other terminals

Always

10 kΩ or higher

H43-3 (IG41) - Body ground and other terminals

Always

10 kΩ or higher

H61-1 (IG) - Body ground and other terminals

Always

10 kΩ or higher

Combination Meter Assembly

Tester Connection

Condition

Specified Condition

H43-10 (IG12) - H6-38 (IG+)

Always

Below 1 Ω

H43-10 (IG12) - Body ground and other terminals

Always

10 kΩ or higher

H6-38 (IG+) - Body ground and other terminals

Always

10 kΩ or higher

Power Steering ECU with Motor Assembly

Tester Connection

Condition

Specified Condition

H43-23 (IG31) - H1-1 (IG)

Always

Below 1 Ω

H43-23 (IG31) - Body ground and other terminals

Always

10 kΩ or higher

H1-1 (IG) - Body ground and other terminals

Always

10 kΩ or higher

Air Conditioning Control Assembly

Tester Connection

Condition

Specified Condition

H43-3 (IG41) - H31-9 (IG+)

Always

Below 1 Ω

H43-3 (IG41) - Body ground and other terminals

Always

10 kΩ or higher

H31-9 (IG+) - Body ground and other terminals

Always

10 kΩ or higher

Millimeter Wave Radar Sensor Assembly (w/ Toyota Safety Sense)

Tester Connection

Condition

Specified Condition

H43-3 (IG41) - B8-8 (IGB)

Always

Below 1 Ω

H43-3 (IG41) - Body ground and other terminals

Always

10 kΩ or higher

B8-8 (IGB) - Body ground and other terminals

Always

10 kΩ or higher

Skid Control ECU (Brake Actuator Assembly)

Tester Connection

Condition

Specified Condition

H43-23 (IG31) - A108-12 (IGR)

Always

Below 1 Ω

H43-23 (IG31) - Body ground and other terminals

Always

10 kΩ or higher

A108-12 (IGR) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK ENGINE STOP AND START ECU (OUTPUT VOLTAGE FOR EACH SYSTEM)

(a) Disconnect the connector from the corresponding system ECU/sensor.

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

HINT:

Measure the voltage at the corresponding terminals.

Standard Voltage:

Tester Connection

Condition

Specified Condition

H61-2 (B) - Body ground*1

Always

10.5 to 16 V
  • *1: w/ Headup Display

(c) Turn the ignition switch to ON.

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

HINT:

Measure the voltage at the corresponding terminals.

Standard Voltage:

Tester Connection

Condition

Specified Condition

H61-1 (IG) - Body ground

Ignition switch ON

10.5 to 16 V

H6-38 (IG+) - Body ground

Ignition switch ON

10.5 to 16 V

H1-1 (IG) - Body ground

Ignition switch ON

10.5 to 16 V

H31-9 (IG+) - Body ground

Ignition switch ON

10.5 to 16 V

B8-8 (IGB) - Body ground*1

Ignition switch ON

10.5 to 16 V
  • *1: w/ Toyota Safety Sense
OK

CHECK POWER SOURCE CIRCUIT (POWER SOURCE CIRCUIT OF RELATED SYSTEM)
NG

REPLACE ENGINE STOP AND START ECU

6.

CHECK HARNESS AND CONNECTOR (BIN TERMINAL POWER SOURCE CIRCUIT)

(a) Disconnect the external backup boost converter (eco run vehicle converter assembly) connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A3-11 (BIN) - Body ground

Always

9.5 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (EXTERNAL BACKUP BOOST CONVERTER (ECO RUN VEHICLE CONVERTER ASSEMBLY) - BATTERY)
OK

7.

CHECK HARNESS AND CONNECTOR (ACC TERMINAL POWER SOURCE CIRCUIT)

(a) Disconnect the A3 external backup boost converter (eco run vehicle converter assembly) connector.

(b) Turn the ignition switch to ACC.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A3-3 (ACC) - Body ground

Ignition switch ACC

9.5 to 14 V

(d) Turn the ignition switch to off.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A3-3 (ACC) - Body ground

Ignition switch off

0 to 1 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

CHECK HARNESS AND CONNECTOR (EXTERNAL BACKUP BOOST CONVERTER (ECO RUN VEHICLE CONVERTER ASSEMBLY) - BODY GROUND)

(a) Disconnect the A3 external backup boost converter (eco run vehicle converter assembly) connector.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

A3-6 (GND) - Body ground

Ignition switch ACC

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK HARNESS AND CONNECTOR (EXTERNAL BACKUP BOOST CONVERTER (ECO RUN VEHICLE CONVERTER ASSEMBLY) - STEREO COMPONENT EQUALIZER ASSEMBLY)

(a) Disconnect the A3 external backup boost converter (eco run vehicle converter assembly) connector.

(b) Disconnect the O131 stereo component equalizer assembly connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A3-5 (BO1) - O131-15 (+B)

Always

Below 1 Ω

A3-12 (ACO) - O132-14 (ACC)

Always

Below 1 Ω

A3-5 (BO1) - Body ground and other terminal

Always

Below 1 Ω

O131-15 (+B) - Body ground and other terminal

Always

10 kΩ or higher

A3-12 (ACO) - Body ground and other terminal

Always

10 kΩ or higher

O131-14 (ACC) - Body ground and other terminal

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

10.

CHECK HARNESS AND CONNECTOR (STEREO COMPONENT EQUALIZER ASSEMBLY POWER SOURCE CIRCUIT)

(a) Disconnect the O131 stereo component equalizer assembly connectors.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O131-15 (+B) - Body ground

Always

10.5 to 16 V

(c) Turn the Ignition switch to ACC.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

O131-14 (ACC) - Body ground

Ignition switch ACC

10.5 to 16 V
OK

GO TO ACTIVE NOISE CONTROL SYSTEM

NG

REPLACE EXTERNAL BACKUP BOOST CONVERTER (ECO RUN VEHICLE CONVERTER ASSEMBLY)

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