STOP AND START STOP AND START SYSTEM P323A00 Backup Boost Converter "A" P323A16 Backup Boost Converter "A" Circuit Voltage Below Threshold P323B14 Backup Boost Converter "A" Control Circuit Circuit Short to Ground or Open P323B29 Backup Boost Converter "A" Control Circuit Signal Invalid 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:·
Tire pressure warning system
·Audio and visual system
·CAN communication system
·Pre-collision system
·Air conditioning system
·Digital rear-view mirror system
·Blind spot monitor system
·Headup display system
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Memory | Note |
|---|---|---|---|---|---|---|
| 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 |
| P323B14 | Backup Boost Converter "A" Control Circuit Circuit Short to Ground or Open | 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
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 GTS 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.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs.
- Powertrain > Stop and Start > Clear DTCs
- 50002 392
Start the engine and warm it up.
Drive the vehicle at 7 km/h (4 mph) or more.
- CAUTION:
-
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.
- HINT:
-
If the engine cranks slowly when the engine is restarted, it can be determined that the battery voltage is low.
Check that DTCs are not output.
- Powertrain > Stop and Start > Trouble Codes
- 50001 392
STOP AND START SYSTEM OPERATION CHECK
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.
·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.
·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.
·Bleed the oil pump with motor assembly (continuously variable transaxle assembly) after removing and installing the continuously variable transaxle assembly or replacing the CVT fluid.
·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.
·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.
PROCEDURE
| *a | Front view of wire harness connector
(to Engine Stop and Start ECU) |
Disconnect the engine stop and start ECU connector.
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 NG
OK
NG
| *a | Front view of wire harness connector
(to Engine Stop and Start ECU) |
Disconnect the engine stop and start ECU connector.
Turn the ignition switch to ON.
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
- Result:
Proceed to OK NG
OK
NG
Disconnect the engine stop and start ECU connector.
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
- Result:
Proceed to OK NG
OK
NG
Disconnect the engine stop and start ECU connector.
Disconnect the tire pressure warning ECU and receiver connector.
Disconnect the radio and display receiver assembly connector.
Disconnect the millimeter wave radar sensor assembly connector. (w/ Pre-collision System)
Disconnect the air conditioning control assembly connector.
Disconnect the meter mirror sub-assembly connector. (w/ Headup Display System)
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition A32-2 (B41) - M8-7 (+B) Always Below 1 Ω A32-3 (IG41) - M8-1 (IG) Always Below 1 Ω A32-12 (B42) - G155-4 (+B) Always Below 1 Ω A32-3 (IG41) - B9-8 (IGB)*1 Always Below 1 Ω A32-3 (IG41) - G24-9 (IG+) Always Below 1 Ω A32-2 (B41) - G138-2 (B)*2 Always Below 1 Ω A32-3 (IG41) - G138-1 (IG)*2 Always Below 1 Ω A32-2 (B41) or M8-7 (+B) - Body ground and other terminals Always 10 kΩ or higher A32-3 (IG41) or M8-1 (IG) - Body ground and other terminals Always 10 kΩ or higher A32-12 (B42) or G155-4 (+B) - Body ground and other terminals Always 10 kΩ or higher A32-3 (IG41) or B9-8 (IGB)*1 - 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 A32-2 (B41) or G138-2 (B)*2 - Body ground and other terminals Always 10 kΩ or higher A32-3 (IG41) or G138-1 (IG)*2 - Body ground and other terminals Always 10 kΩ or higher
*1: w/ Pre-collision System
*2: w/ Headup Display System
- Result:
Proceed to OK NG
OK
NG