Refer to DTC P323A19.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | 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 | 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 | 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 | 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):
·
B41 or IG41 voltage is 6.0 V or less and backup boost converter output overcurrent is not detected. ·
B42 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 | 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 | 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 | 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 | SAE Code: P323C |
CONFIRMATION AFTER TROUBLESHOOTING
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 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 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.
Clear the DTCs.
Start the engine and warm it up.
Drive the vehicle at 7 km/h (4 mph) or more.
When performing Confirmation Driving Pattern, obey all speed limits and traffic laws.
Depress the brake pedal and stop the vehicle.
Keep the engine stopped by stop and start control for 1 second or more. (Keep the shift lever in D.)
Release the brake pedal with the shift lever in D to start the engine.
If the engine cranks slowly when the engine is restarted, it can be determined that the auxiliary battery voltage is low.
Check that DTCs are not output.
STOP AND START SYSTEM OPERATION CHECK
Refer to DTC P323A19.
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.
After replacing the engine stop and start ECU, perform learning of the external backup boost converter (eco run vehicle converter assembly).
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.
Inspect the fuses for circuits related to this system before performing the following procedure.
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.
For wire harness and connector inspection procedures and precautions, refer to "General>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>ELECTRONIC CIRCUIT INSPECTION PROCEDURE202201,999999,_V1,_107171,_0496334,RM100000001YK2F,"
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.
Disconnect the A168 engine stop and start ECU connector.
Remove the BBC NO. 1 fuse and BBC NO. 2 fuse from the No. 1 engine room relay block.
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A168-1 (BIN2) - 2 (BBC NO. 2 fuse holder) | Always | Below 1 Ω |
| A168-3 (BIN1) - 2 (BBC NO. 1 fuse holder) | Always | Below 1 Ω |
| A168-1 (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 |
| A168-3 (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 |
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Disconnect the A168 and I230 engine stop and start ECU connectors.
Measure the voltage according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A168-1 (BIN2) - Body ground | Always | 9.5 to 14 V |
| A168-3 (BIN1) - Body ground | Always | 9.5 to 14 V |
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I230-18 (IGP) - Body ground | Ignition switch ON | 9.5 to 14 V |
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Disconnect the A168 and A169 engine stop and start ECU connectors.
Measure the voltage according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A168-8 (GND1) - Body ground | Always | 9.5 to 14 V |
| A168-2 (GND2) - Body ground | Always | 9.5 to 14 V |
| A169-6 (DGND) - Body ground | Always | 9.5 to 14 V |
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Disconnect the I230 engine stop and start ECU connector.
Disconnect the I4 combination meter assembly connector.
Disconnect the I21 power steering ECU assembly connector.
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I230-10 (IG12) - I4-6 (IG+) | Always | Below 1 Ω |
| I230-23 (IG31) - I21-1 (IG) | Always | Below 1 Ω |
| I230-10 (IG12) - Body ground and other terminals | Always | 10 kΩ or higher |
| I230-23 (IG31) - Body ground and other terminals | Always | 10 kΩ or higher |
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Check the vehicle specification
| Result | Proceed to |
|---|---|
| w/ Smart Entry and Start System | A |
| w/o Smart Entry and Start System | B |
A
B
Disconnect the I230 engine stop and start ECU connector.
Disconnect the O18 tire pressure warning ECU and receiver connector.
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I230-2 (B41) - O18-7 (+B) | Always | Below 1 Ω |
| I230-3 (IG41) - O18-1 (IGR) | Always | Below 1 Ω |
| I230-2 (B41) - Body ground and other terminals | Always | 10 kΩ or higher |
| I230-3 (IG41) - Body ground and other terminals | Always | 10 kΩ or higher |
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Check the vehicle specification
| Result | Proceed to |
|---|---|
| w/ Navigation System | A |
| w/o Navigation System | B |
A
B
Disconnect the I230 engine stop and start ECU connector.
Disconnect the I253 radio and display receiver assembly connector.
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I230-12 (B42) - I253-4 (+B1) | Always | Below 1 Ω |
| I230-12 (B42) - Body ground and other terminals | Always | 10 kΩ or higher |
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Check the vehicle specification
| Result | Proceed to |
|---|---|
| w/o Clearance Sonar System | A |
| w/ Clearance Sonar System | B |
A
B
Check air conditioning system specification
| Result | Proceed to |
|---|---|
| for Mechanical Control Type | A |
| for Electrical Control Type | B |
A
B
Disconnect the I230 engine stop and start ECU connector.
Disconnect the I37 air conditioning control assembly connector.
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I230-3 (IG41) - I37-9 (IG+) | Always | Below 1 Ω |
| I230-3 (IG41) - Body ground and other terminals | Always | 10 kΩ or higher |
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Disconnect the I230 engine stop and start ECU connector.
Disconnect the I24 clearance warning ECU assembly connector.
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I230-3 (IG41) - I24-1 (IG) | Always | Below 1 Ω |
| I230-3 (IG41) - Body ground and other terminals | Always | 10 kΩ or higher |
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Disconnect the I230 engine stop and start ECU connector.
Disconnect the I257 radio and display receiver assembly connector.
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I230-12 (B42) - I257-4 (+B1) | Always | Below 1 Ω |
| I230-26 (AC42) - I257-3 (ACC1) | Always | Below 1 Ω |
| I230-12 (B42) - Body ground and other terminals | Always | 10 kΩ or higher |
| I230-26 (AC42) - Body ground and other terminals | Always | 10 kΩ or higher |
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Disconnect the I230 engine stop and start ECU connector.
Disconnect the O124 tire pressure warning ECU and receiver connector.
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I230-2 (B41) - O124-7 (+B) | Always | Below 1 Ω |
| I230-3 (IG41) - O124-1 (IGR) | Always | Below 1 Ω |
| I230-2 (B41) - Body ground and other terminals | Always | 10 kΩ or higher |
| I230-3 (IG41) - Body ground and other terminals | Always | 10 kΩ or higher |
| Proceed to |
|---|
| OK |
| NG |
OK
NG