STOP AND START: STOP AND START SYSTEM: P30DF62,P30EF4B,P323A00,P323A16,P323AA2,P323B29,P323B38; Backup Boost Converter Circuit Board(Thermistor) Signal Compare Failure; 2020 MY RAV4 [10/2019

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001LLQN
Model Year Start: 2020	Model: RAV4	Prod Date Range: [10/2019 - 08/2020]
Title: STOP AND START: STOP AND START SYSTEM: P30DF62,P30EF4B,P323A00,P323A16,P323AA2,P323B29,P323B38; Backup Boost Converter Circuit Board(Thermistor) Signal Compare Failure; 2020 MY RAV4 [10/2019 - 08/2020]

DTC

P30DF62

Backup Boost Converter Circuit Board(Thermistor) Signal Compare Failure

DTC

P30EF4B

Backup Boost Converter Circuit Board Over Temperature

DTC

P323A00

Backup Boost Converter "A"

DTC

P323A16

Backup Boost Converter "A" Circuit Voltage Below Threshold

DTC

P323AA2

Backup Boost Converter "A" System Voltage Low

DTC

P323B29

Backup Boost Converter "A" Control Circuit Signal Invalid

DTC

P323B38

Backup Boost Converter "A" Control Circuit Signal Cycle Invalid

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 condition 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 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 condition 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 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 condition is met for 1 second or more (1 trip detection logic): Backup boost converter malfunction is detected.	Wire harness or connector 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 1 second or more (1 trip detection logic): B41 or IG41 voltage is 6.0 V or less and backup boost converter output overcurrent is not detected. 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 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 condition is met for 1 second or more (1 trip detection logic): Backup boost converter malfunction is detected.	Wire harness or connector 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 condition is met for 1 second or more (1 trip detection logic): Backup boost converter malfunction is detected.	Wire harness or connector 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 condition is met for 1 second or more (1 trip detection logic): Backup boost converter malfunction is detected.	Wire harness or connector 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 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 Battery Charge Control" changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the battery fluid temperature at 11°C (51°F) or higher, the refresh charge will be completed.)
If the Techstream is not available and the Data List item "Status of Battery Charge Control" cannot be checked, charge the 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) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Clear the DTCs.

Powertrain > Stop and Start > Clear DTCs

(e) Start the engine and warm it up.

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

CAUTION:

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

(g) Depress the brake pedal and stop the vehicle.

(h) Keep the engine stopped by stop and start control for 1 second or more. (Keep the shift lever in D.)

(i) Release the brake pedal with the shift lever in D to start the engine.

HINT:

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

(j) Check that DTCs are not output.

Powertrain > Stop and Start > Trouble Codes

STOP AND START SYSTEM OPERATION CHECK

HINT:

If the cable is disconnected from the 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 Battery Charge Control" changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the battery fluid temperature at 11°C (51°F) or higher, the refresh charge will be completed.)
If the Techstream is not available and the Data List item "Status of Battery Charge Control" cannot be checked, charge the 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.

(a) Start the engine and warm it up.

(b) Turn the air conditioning system off.

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

(d) Depress the brake pedal and stop the vehicle.

(e) Allow the engine to stop by stop and start control. (Keep the shift lever in D.)

(f) Release the brake pedal with the shift lever in D to start the engine.

WIRING DIAGRAM

Refer to DTC P323A19.

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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.
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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.
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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.
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When the engine stop and start ECU or oil pump with solenoid assembly is replaced, check the oil pump with solenoid assembly.
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Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

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.
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Using the Techstream, 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.
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PROCEDURE

1.	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

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

2.	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.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A32-21 (IG1) - Body ground	Ignition switch ON	9.5 to 14 V

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

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

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A34-6 (DGND) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

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

(b) Disconnect the radio and display receiver assembly connector. (w/ Display Audio System)

(c) Disconnect the electrical key and tire pressure monitoring system receiver assembly connector. (w/ Tire Pressure Warning System)

(d) Disconnect the central gateway ECU (network gateway ECU) connector.

(e) Disconnect the millimeter wave radar sensor assembly connector. (w/ Dynamic Radar Cruise Control System)

(f) Disconnect the blind spot monitor sensor LH connector.

(g) Disconnect the blind spot monitor sensor RH connector.

(h) Disconnect the air conditioning control assembly connector.

(i) Disconnect the clearance warning ECU assembly connector.

(j) Disconnect the inner rear view mirror assembly connector. (w/ EC Mirror)

(k) Disconnect the inner rear view mirror assembly connector. (w/ Digital Rear-view Mirror System)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A32-12 (B42) - G3-4 (+B1)*1	Always	Below 1 Ω
A32-2 (B41) - M8-7 (+B)*2	Always	Below 1 Ω
A32-3 (IG41) - M8-1 (IG)*2	Always	Below 1 Ω
A32-3 (IG41) - G72-11 (IG1)	Always	Below 1 Ω
A32-3 (IG41) - B9-8 (IGB)*3	Always	Below 1 Ω
A32-3 (IG41) - Q1-5 (BLB)	Always	Below 1 Ω
A32-3 (IG41) - Q13-5 (BRB)	Always	Below 1 Ω
A32-3 (IG41) - G24-9 (IG+)	Always	Below 1 Ω
A32-3 (IG41) - G25-1 (IG)*4	Always	Below 1 Ω
A32-3 (IG41) - H4-1 (IG)*5	Always	Below 1 Ω
A32-3 (IG41) - P2-4 (IG)*6	Always	Below 1 Ω
A32-3 (IG41) - P3-1 (IG)*7	Always	Below 1 Ω
A32-11 (B43) - P1-6 (+B)*8	Always	Below 1 Ω
A32-12 (B42) or G3-4 (+B1)*1 - Body ground and other terminals	Always	10 kΩ or higher
A32-2 (B41) or M8-7 (+B)*2 - Body ground and other terminals	Always	10 kΩ or higher
A32-3 (IG41) or M8-1 (IG)*2 - Body ground and other terminals	Always	10 kΩ or higher
A32-3 (IG41) or G72-11 (IG1) - Body ground and other terminals	Always	10 kΩ or higher
A32-3 (IG41) or B9-8 (IGB)*3 - Body ground and other terminals	Always	10 kΩ or higher
A32-3 (IG41) or Q1-5 (BLB) - Body ground and other terminals	Always	10 kΩ or higher
A32-3 (IG41) or Q13-5 (BRB) - Body ground and other terminals	Always	10 kΩ or higher
A32-3 (IG41) or G24-9 (IG+) - Body ground and other terminals	Always	10 kΩ or higher
A32-3 (IG41) or G25-1 (IG)*4 - Body ground and other terminals	Always	10 kΩ or higher
A32-3 (IG41) or H4-1 (IG)*5 - Body ground and other terminals	Always	10 kΩ or higher
A32-3 (IG41) or P2-4 (IG)*6 - Body ground and other terminals	Always	10 kΩ or higher
A32-3 (IG41) or P3-1 (IG)*7 - Body ground and other terminals	Always	10 kΩ or higher
A32-11 (B43) or P1-6 (IG)*8 - Body ground and other terminals	Always	10 kΩ or higher

*1: w/ Display Audio System
*2: w/ Tire Pressure Warning System
*3: w/ Dynamic Radar Cruise Control System
*4: except TMC Made
*5: for TMC Made
*6: for EC Mirror, w/ Forward Recognition Camera
*7: for EC Mirror, w/o Forward Recognition Camera
*8: w/ Digital Rear-view Mirror System

REPLACE ENGINE STOP AND START ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR