Toyota Yaris: Stop And Start System / Backup Boost Converter Circuit Board(Thermistor) Signal Compare Failure (P30DF62,P30EF4B,P323A00,P323A16,P323AA2,P323B29,P323B38)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Engine & Hybrid System / Stop And Start / Stop And Start System / Backup Boost Converter Circuit Board(Thermistor) Signal Compare Failure (P30DF62,P30EF4B,P323A00,P323A16,P323AA2,P323B29,P323B38)

DESCRIPTION

Refer to DTC P323A19.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Memory

Note

P30DF62

Backup Boost Converter Circuit Board(Thermistor) Signal Compare Failure

The following conditions is met for 1 second or more (1 trip detection logic):

  • Difference in temperature between thermistor 1 and thermistor 2 of the engine stop and start ECU is 40°C (72°F) or higher.
  • Wire harness or connector
  • Auxiliary battery
  • BBC NO. 1 fuse
  • BBC NO. 2 fuse
  • Engine stop and start ECU

Blinks

DTC stored

SAE Code: P30DF

P30EF4B

Backup Boost Converter Circuit Board Over Temperature

The following conditions is met for 1 second or more (1 trip detection logic):

  • Engine stop and start ECU thermistor temperature is 135°C (275°F) or higher.
  • Wire harness or connector
  • Auxiliary battery
  • BBC NO. 1 fuse
  • BBC NO. 2 fuse
  • Engine stop and start ECU

Blinks

DTC stored

SAE Code: P30EF

P323A00

Backup Boost Converter "A"

The following conditions is met for 1 second or more (1 trip detection logic):

  • Backup boost converter malfunction is detected.
  • Wire harness or connector
  • Auxiliary battery
  • BBC NO. 1 fuse
  • BBC NO. 2 fuse
  • Engine stop and start ECU

Blinks

DTC stored

SAE Code: P323A

P323A16

Backup Boost Converter "A" Circuit Voltage Below Threshold

One of the following conditions is met for 2 second or more (1 trip detection logic):

  • IG41 voltage is 6.0 V or less and backup boost converter output overcurrent is not detected.
  • B41, B42 or B43 voltage is 6.0 V or less, backup boost converter is not overheating and backup boost converter output overcurrent is not detected.
  • Wire harness or connector
  • Auxiliary battery
  • BBC NO. 1 fuse
  • BBC NO. 2 fuse
  • Engine stop and start ECU

Blinks

DTC stored

SAE Code: P323A

P323AA2

Backup Boost Converter "A" System Voltage Low

The following conditions is met for 1 second or more (1 trip detection logic):

  • Backup boost converter malfunction is detected.
  • Wire harness or connector
  • Auxiliary battery
  • BBC NO. 1 fuse
  • BBC NO. 2 fuse
  • Engine stop and start ECU

Blinks

DTC stored

SAE Code: P323A

P323B29

Backup Boost Converter "A" Control Circuit Signal Invalid

The following conditions is met for 1 second or more (1 trip detection logic):

  • Backup boost converter malfunction is detected.
  • Wire harness or connector
  • Auxiliary battery
  • BBC NO. 1 fuse
  • BBC NO. 2 fuse
  • Engine stop and start ECU

Blinks

DTC stored

SAE Code: P323C

P323B38

Backup Boost Converter "A" Control Circuit Signal Cycle Invalid

The following conditions is met for 1 second or more (1 trip detection logic):

  • Backup boost converter malfunction is detected.
  • Wire harness or connector
  • Auxiliary battery
  • BBC NO. 1 fuse
  • BBC NO. 2 fuse
  • Engine stop and start ECU

Blinks

DTC stored

SAE Code: P323C

CONFIRMATION DRIVING PATTERN

HINT:

  • If the cable is disconnected from the auxiliary battery terminal, stop and start control is prohibited until refresh charge is completed.

    In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item Status of Auxiliary battery Charge Control changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the auxiliary battery fluid temperature at 11°C (52°F) or higher, the refresh charge will be completed.)

  • If the GTS is not available and the Data List item Status of auxiliary battery Charge Control cannot be checked, charge the auxiliary battery by idling the engine for approximately 5 to 60 minutes or driving the vehicle, and then drive the vehicle and check that stop and start control operates.

    If the engine is started with the hood open, the system determines that a jump start has occurred. Therefore, make sure that the hood is closed before starting the engine and driving the vehicle.

  • After the refresh charge completes, turn the ignition switch off, wait for at least 30 seconds, and then start the engine again. If the vehicle enters refresh charge mode again while the engine is idling, the initial refresh charge did not properly complete, so wait for the refresh charge to complete.
  • Allow the engine to idle for 3 minutes after it is warmed up and check that the engine idle speed is within 50 rpm of the target idle speed.

CONFIRMATION AFTER TROUBLESHOOTING

(a) Clear the DTCs.

Powertrain > Stop and Start > Clear DTCs

(b) Start the engine and warm it up.

(c) Drive the vehicle at 7 km/h (4 mph) or more.

CAUTION:

When performing Confirmation Driving Pattern, obey all speed limits and traffic laws.

(d) Stop the vehicle, move the shift lever to neutral and release the clutch pedal.

(e) Keep the engine stopped by stop and start control for 1 second or more.

(f) Depress the clutch pedal and start the engine.

HINT:

If the engine cranks slowly when the engine is restarted, it can be determined that the auxiliary battery voltage is low.

(g) Check that DTCs are not output.

Powertrain > Stop and Start > Trouble Codes

STOP AND START SYSTEM OPERATION CHECK

Click here

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

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

HINT:

  • Using the GTS, read the freeze frame data before troubleshooting. System condition information is recorded as freeze frame data the moment a DTC is stored. This information can be useful when troubleshooting.

    Click here

  • For wire harness and connector inspection procedures and precautions, refer to " "
  • DTCs for the stop and start system are not cleared even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs.

    Click here

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BBC NO.1 FUSE AND BBC NO. 2 FUSE)

(a) Disconnect the A66 engine stop and start ECU connector.

(b) Remove the BBC NO. 1 fuse and BBC NO. 2 fuse from the No. 1 engine room relay block.

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

Click here

Standard Voltage:

Tester Connection

Condition

Specified Condition

A66-1 (BIN2) - 2 (BBC NO. 2 fuse holder)

Always

Below 1 Ω

A66-3 (BIN1) - 2 (BBC NO. 1 fuse holder)

Always

Below 1 Ω

A66-1 (BIN2) - Body ground and other terminals

Always

10 kΩ or higher

2 (BBC NO. 2 fuse holder) - Body ground and other terminals

Always

10 kΩ or higher

A66-3 (BIN1) - Body ground and other terminals

Always

10 kΩ or higher

2 (BBC NO. 1 fuse holder) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU POWER SOURCE CIRCUIT)

(a) Disconnect the A66 and H43 engine stop and start ECU connectors.

(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

(c) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

H43-18 (IGP) - Body ground

Always

9.5 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

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

(a) Disconnect the A66 and A67 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

A66-8 (GND1) - Body ground

Always

9.5 to 14 V

A66-2 (GND2) - Body ground

Always

9.5 to 14 V

A67-6 (DGND) - Body ground

Always

9.5 to 14 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 H43 engine stop and start ECU connector.

(b) Disconnect the H6 combination meter assembly connector.

(c) Disconnect the H31 air conditioning control assembly connector.

(d) Disconnect the H1 power steering ECU with motor assembly connector.

(e) Disconnect the A108 skid control ECU (brake actuator assembly) connector.

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

Click here

Standard Resistance:

Tester Connection

Condition

Specified Condition

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

Always

Below 1 Ω

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

   

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

Always

Below 1 Ω

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

   

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

Always

10 kΩ or higher

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

Always

10 kΩ or higher

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

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK VEHICLE SPECIFICATION

(a) Check the vehicle specification

Result

Proceed to

w/ Headup Display

A

w/o Headup Display

B

B

GO TO STEP 9

A

6.

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

(a) Disconnect the H43 engine stop and start ECU connector.

(b) Disconnect the H61 meter mirror sub-assembly connector.

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

Click here

Standard Resistance:

Tester Connection

Condition

Specified Condition

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

Always

Below 1 Ω

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

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

CHECK VEHICLE SPECIFICATION

(a) Check the vehicle specification

Result

Proceed to

w/ Toyota Safety Sense

A

w/o Toyota Safety Sense

B

B

REPLACE ENGINE STOP AND START ECU

A

8.

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

(a) Disconnect the H43 engine stop and start ECU connector.

(b) Disconnect the B8 millimeter wave radar sensor assembly connector.

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

Click here

Standard Resistance:

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

OK

REPLACE ENGINE STOP AND START ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.

CHECK VEHICLE SPECIFICATION

(a) Check the vehicle specification

Result

Proceed to

w/ Toyota Safety Sense

A

w/o Toyota Safety Sense

B

B

REPLACE ENGINE STOP AND START ECU

A

10.

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

(a) Disconnect the H43 engine stop and start ECU connector.

(b) Disconnect the B8 millimeter wave radar sensor assembly connector.

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

Click here

Standard Resistance:

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

OK

REPLACE ENGINE STOP AND START ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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