STOP AND START: STOP AND START SYSTEM: P33B300; External BBC Circuit; 2020 - 2022 MY RAV4 [10/2019

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001KZA2
Model Year Start: 2020	Model: RAV4	Prod Date Range: [10/2019 - 10/2022]
Title: STOP AND START: STOP AND START SYSTEM: P33B300; External BBC Circuit; 2020 - 2022 MY RAV4 [10/2019 - 10/2022]

DTC

P33B300

External BBC Circuit

DESCRIPTION

When the engine is started (high electrical load) from engine stopped by the stop and start control, the external backup boost converter (eco run vehicle converter assembly) supplements battery voltage in order to prevent the function from being disabled due to decrease in power source voltage supplied to the navigation system.

After receiving a request from the engine stop and start ECU, the external backup boost converter (eco run vehicle converter assembly) helps maintain the power source voltage if the battery voltage drops due to the high electrical load when the engine is restarted by stop and start control. The DON2 terminal of the external backup boost converter (eco run vehicle converter assembly) receives power supply voltage supplement requests from the engine stop and start ECU and switches from idle mode to supplement mode.

When the engine is started by the stop and start control, if the external backup boost converter (eco run vehicle converter assembly) does not maintain the specified voltage, an error is sent to the engine stop and start ECU. Then, the engine stop and start ECU stores DTC P33B300, and the stop and start cancel indicator blinks.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Memory	Note
P33B300	External BBC Circuit	Any of the following conditions are met for 1 second or more (1 trip detection logic): External backup boost converter (eco run vehicle converter assembly) period malfunction. External backup boost converter (eco run vehicle converter assembly) internal power supply overvoltage. External backup boost converter (eco run vehicle converter assembly) internal power supply undervoltage. External backup boost converter (eco run vehicle converter assembly) duty value malfunction.	Wire harness or connector Battery BBC NO. 3 fuse External backup boost converter (eco run vehicle converter assembly) ECU-ACC fuse	Blinks	DTC stored	SAE Code: P33B3

CONFIRMATION DRIVING PATTERN

CONFIRMATION AFTER TROUBLESHOOTING

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.

(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 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

CAUTION / NOTICE / HINT

NOTICE:

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.
Click here
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.
Click here

PROCEDURE

1.	CONFIRM FREEZE FRAME DATA (STATE OF EXTERNAL BBC)

NOTICE:

Clearing the DTC will also clear the freeze frame data, so before clearing be sure to record the freeze frame data.

(a) Following the display on the Techstream, check the freeze frame data and read "State of External BBC" in the freeze frame data when P33B300 was output.

Powertrain > Stop and Start

Tester Display
State of External BBC

Techstream Display	Proceed to
Duty Err	A
Cycle Err	A
Low Vol	B
Overvoltage	C

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

GO TO STEP 4

2.	CHECK CONNECTOR (EXTERNAL BACKUP BOOST CONVERTER (ECO RUN VEHICLE CONVERTER ASSEMBLY))

(a) Check if the connector of the external backup boost converter (eco run vehicle converter assembly) is connected securely.

OK:

The connector is securely connected.

CONNECT CONNECTOR CORRECTLY

3.	CHECK HARNESS AND CONNECTOR (EXTERNAL BACKUP BOOST CONVERTER (ECO RUN VEHICLE CONVERTER ASSEMBLY) 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
A14-11 (BIN) - Body ground	Always	9.5 to 14 V
A14-3 (ACC) - Body ground	Ignition switch (ACC)	9.5 to 14 V

*a	Front view of wire harness connector (to External Backup Boost Converter (Eco Run Vehicle Converter Assembly))

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - EXTERNAL BACKUP BOOST CONVERTER (ECO RUN VEHICLE CONVERTER ASSEMBLY))

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A34-19 (DON2) - A14-1 (DON2)	Always	Below 1 Ω
A34-19 (DON2) or A14-1 (DON2) - Body ground and other terminals	Always	10 kΩ or higher

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

REPAIR OR REPLACE HARNESS OR CONNECTOR