| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000002EMAD |
| Model Year Start: 2024 | Model: RAV4 | Prod Date Range: [10/2023 - ] |
| Title: STOP AND START: STOP AND START SYSTEM: P323A00,P323A16,P323B14,P323B29,P323B38; Backup Boost Converter "A"; 2024 MY RAV4 [10/2023 - ] | ||
|
DTC |
P323A00 |
Backup Boost Converter "A" |
|
DTC |
P323A16 |
Backup Boost Converter "A" Circuit Voltage Below Threshold |
|
DTC |
P323B14 |
Backup Boost Converter "A" Control Circuit Circuit Short to Ground or Open |
|
DTC |
P323B29 |
Backup Boost Converter "A" Control Circuit Signal Invalid |
|
DTC |
P323B38 |
Backup Boost Converter "A" Control Circuit Signal Cycle Invalid |
DESCRIPTION
A backup boost converter is built into the engine stop and start ECU.
The backup boost converter helps maintain battery voltage to prevent various functions from failing if power source voltage supplied from the backup boost converter drops due to the high electrical load when the engine is restarted by stop and start control.
The backup boost converter 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.
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:
- Dynamic radar cruise control system
- Tire pressure warning system
- Vehicle stability control system
- Power steering system
- Audio and visual system
- Blind spot monitor system
- Telematics system
- CAN communication system
- Meter / gauge system
- Headup display system
- Air conditioning system
- Intuitive parking assist system
- Digital rear-view mirror system
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Warning Indicate |
Note |
|---|---|---|---|---|---|---|
|
P323A00 |
Backup Boost Converter "A" |
The following condition is met for 1 second or more (1 trip detection logic):
|
|
Comes on |
Does not come on |
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):
|
|
Does not come on |
Does not come on |
SAE Code: P323A |
|
P323B14 |
Backup Boost Converter "A" Control Circuit Circuit Short to Ground or Open |
The following conditions is met for 1 second or more (1 trip detection logic):
|
|
Comes on |
Does not come on |
SAE Code: P323D |
|
P323B29 |
Backup Boost Converter "A" Control Circuit Signal Invalid |
The following condition is met for 1 second or more (1 trip detection logic):
|
|
Comes on |
Does not come on |
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):
|
|
Comes on |
Does not come on |
SAE Code: P323C |
MONITOR STRATEGY
|
Related DTCs |
P323A, P323D, P323C: Starter / generator control module internal back up boost converter performance |
|
Required Sensors/Components (Main) |
Engine stop and start ECU |
|
Required Sensors/Components (Related) |
- |
|
Frequency of Operation |
Continuous |
|
Duration |
1 second |
|
MIL Operation |
Immediate |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
P323A, P323C (Case1), P323D
|
All of the following conditions are met |
- |
|
Battery voltage |
8 V or higher |
|
Write Inhibit |
permit |
|
Time after Write status forbiddance to permit |
0.5 seconds or more |
|
Ignition switch |
ON |
|
Time after ignition switch is off to ON |
0.5 seconds or more |
|
Starter |
OFF |
|
Time after starter on to off |
0.5 seconds or more |
|
Engine stop and start ECU internal back up boost converter fail (P323C) |
Not detected |
P323C (Case2)
|
Monitor runs whenever the following DTCs are not stored |
None |
|
All of the following conditions are met |
- |
|
Time after engine stop and start ECU power ON |
0.1 seconds or more |
|
Back up boost converter control IC status signal frequency |
Less than 50 Hz |
|
Number of BBC control IC status signal pulse |
3 times or more |
TYPICAL MALFUNCTION THRESHOLDS
P323A (Case 1)
|
The following condition is met |
2 times or more |
|
Back up boost converter control IC power supply voltage |
Higher than 5.8 V |
P323A (Case 2)
|
Both of the following conditions are met |
20 times or more |
|
Back up boost converter boosted voltage |
17 V or higher |
|
Time after Engine restart by engine stop and start ECU |
Less than 1 second |
P323A (Case 3)
|
Both of the following conditions are met |
13 times or more |
|
Back up boost converter boosted voltage |
9 V or less |
|
Time after Engine restart by engine stop and start ECU |
Less than 1 second |
P323A (Case 4)
|
Both of the following conditions are met |
13 times or more |
|
Back up boost converter feedback control voltage |
2.7 V or higher |
|
Time after Engine restart by engine stop and start ECU |
Less than 1 second |
P323A (Case 5)
|
Both of the following conditions are met |
2 times or more |
|
Back up boost converter boosted voltage |
3 V or less |
|
Battery voltage detected by back up boost converter control IC |
4.6 V or higher |
P323A (Case 6)
|
Both of the following conditions are met |
98 times or more |
|
Back up boost converter circuit negative power supply voltage |
Higher than -1.8 V |
|
Back up boost converter control IC power supply voltage |
4.2 V or higher |
P323A (Case 7)
|
The following condition is met |
2 times or more |
|
Difference between positive voltage and negative voltages (Back up boost converter output current sensor circuit) |
Higher than 0.085 V |
P323A (Case 8)
|
The following condition is met |
8 times or more |
|
Back up boost converter output current sensor circuit resistance |
More than 450000 Ω |
P323C
|
One of the following conditions is met |
- |
|
Back up boost converter control IC status signal frequency |
Less than 90.91 Hz |
|
Back up boost converter control IC status signal frequency |
Higher than 111.11 Hz |
|
Back up boost converter control IC status signal duty cycle |
Higher than 0%, and less than 7.5% |
|
Back up boost converter control IC status signal duty cycle |
Higher than 17.5%, and less than 32.5% |
|
Back up boost converter control IC status signal duty cycle |
Higher than 42.5%, and less than 57.5% |
|
Back up boost converter control IC status signal duty cycle |
Higher than 67.5%, and less than 82.5% |
|
Back up boost converter control IC status signal duty cycle |
Higher than 92.5%, and less than 100% |
P323D
|
Back up boost converter control IC power supply voltage |
Less than 3 V |
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.
-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
![2024 MY RAV4 [10/2023 - ]; STOP AND START: STOP AND START SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
- When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories
CONFIRMATION AFTER TROUBLESHOOTING
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream 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
Click here
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
-
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
-
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
-
When the engine stop and start ECU or oil pump with solenoid assembly is replaced, check the oil pump with solenoid assembly.
Click here
- 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. |
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 |
|
Result |
Proceed to |
|---|---|
|
OK (Except TMC Made) |
A |
|
OK (for TMC Made) |
B |
|
NG |
C |
| B |
|
| C |
|
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.
(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 |
| OK |
|
| NG |
|
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 (IGR 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 (IGR) - 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)) |
|
|
4. |
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 |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
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/ Digital Rear-view Mirror System)
(k) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A32-11 (B43) - P1-6 (+B)*1 |
Always |
Below 1 Ω |
|
A32-12 (B42) - G3-4 (+B1)*2 |
Always |
Below 1 Ω |
|
A32-2 (B41) - M60-7 (+B)*3 |
Always |
Below 1 Ω |
|
A32-3 (IG41) - M60-1 (IG)*3 |
Always |
Below 1 Ω |
|
A32-3 (IG41) - G72-11 (IG1) |
Always |
Below 1 Ω |
|
A32-3 (IG41) - B9-8 (IGB)*4 |
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)*5 |
Always |
Below 1 Ω |
|
A32-3 (IG41) - H4-1 (IG)*6 |
Always |
Below 1 Ω |
|
A32-11 (B43) or P1-6 (+B)*1 - Body ground and other terminals |
Always |
10 kΩ or higher |
|
A32-12 (B42) or G3-4 (+B1)*2 - Body ground and other terminals |
Always |
10 kΩ or higher |
|
A32-2 (B41) or M60-7 (+B)*3 - Body ground and other terminals |
Always |
10 kΩ or higher |
|
A32-3 (IG41) or M60-1 (IG)*3 - 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)*4 - 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)*5 - Body ground and other terminals |
Always |
10 kΩ or higher |
|
A32-3 (IG41) or H4-1 (IG)*6 - Body ground and other terminals |
Always |
10 kΩ or higher |
- *1: w/ Digital Rear-view Mirror System
- *2: w/ Display Audio System
- *3: w/ Tire Pressure Warning System
- *4: w/ Dynamic Radar Cruise Control System
- *5: except TMC Made
- *6: for TMC Made
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|