DTC P323A-19: Backup Boost Converter "A" Circuit Current Above Threshold [12/2021 - 10/2023]: Procedure
- CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BBC NO. 1, BBC NO. 2 FUSES)
Pre-procedure1
- Disconnect the engine stop and start ECU connector.
- Remove the BBC NO. 1 and BBC NO. 2 fuses from the NO. 2 engine room relay block and junction block assembly.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition B37-1 (BIN2) - BBC NO. 2 fuse terminal 2 Always Below 1 Ω B37-3 (BIN1) - BBC NO. 1 fuse terminal 2 Always Below 1 Ω B37-1 (BIN2) - Body ground Always 10 kΩ or higher BBC NO. 2 fuse terminal 2 - Body ground Always 10 kΩ or higher B37-3 (BIN1) - Body ground Always 10 kΩ or higher BBC NO. 1 fuse terminal 2 - Body ground Always 10 kΩ or higher Result
Proceed to OK NG
Post-procedure1
- None
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 2
- CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - EACH ECU OR SENSOR)
Pre-procedure1
- Disconnect the engine stop and start ECU connector.
- Disconnect the tire pressure warning ECU and receiver connector.
- Disconnect the meter mirror sub-assembly connector.
- Disconnect the millimeter wave radar sensor assembly connector.
- Disconnect the No. 2 air conditioning control assembly connector.
- Disconnect the clearance warning ECU assembly connector.
- Disconnect the integration control sub-assembly connector.
- Disconnect the No. 1 skid control ECU (brake booster with master cylinder assembly) connector.
- Disconnect the inner rear view mirror assembly connector.
- Remove the DOME CUT relay from the No. 1 luggage room relay block and junction block assembly.
- Disconnect the cooler control switch assembly connector.
- Disconnect the room light control relay connector.
- Disconnect the spot light assembly RH connector. (for 4 Seater)
- Disconnect the spot light assembly LH connector. (for 4 Seater)
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I57-3 (IG41) - T11-1 (IG) Always Below 1 Ω I57-3 (IG41) - I17-1 (IG) Always Below 1 Ω I57-3 (IG41) - A10-8 (IGB) Always Below 1 Ω I57-3 (IG41) - Q52-10 (IG) Always Below 1 Ω I57-3 (IG41) - I58-1 (IG) Always Below 1 Ω I57-3 (IG41) - I199-20 (IG+) Always Below 1 Ω I57-3 (IG41) - I201-8 (IG) Always Below 1 Ω I57-2 (B41) - T11-7 (+B) Always Below 1 Ω I57-2 (B41) - B19-14 (+BI1) Always Below 1 Ω I57-2 (B41) - d22-6 (+B) Always Below 1 Ω I57-2 (B41) - I199-40 (B) Always Below 1 Ω I57-11 (B43) - DOME CUT relay terminal 5 Always Below 1 Ω I57-11 (B43) - I17-2 (B) Always Below 1 Ω I57-11 (B43) - Q116-12 (B) Always Below 1 Ω I57-11 (B43) - I212-1 (+B) Always Below 1 Ω I57-11 (B43) - d32-2 (B)* Always Below 1 Ω I57-11 (B43) - d33-2 (B)* Always Below 1 Ω I57-3 (IG41) - Body ground Always 10 kΩ or higher I57-2 (B41) - Body ground Always 10 kΩ or higher I57-11 (B43) - Body ground Always 10 kΩ or higher *: for 4 Seater
Result
Proceed to OK NG
Post-procedure1
- None
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 3
- CHECK ENGINE STOP AND START ECU
Pre-procedure1
- Disconnect the engine stop and start ECU connectors.
*a Component without harness connected
(Engine Stop and Start ECU)- -
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I57-3 (IG41) - B38-6 (DGND) Always 10 kΩ or higher I57-2 (B41) - B38-6 (DGND) Always 10 kΩ or higher I57-12 (B42) - B38-6 (DGND) Always 10 kΩ or higher I57-11 (B43) - B38-6 (DGND) Always 10 kΩ or higher Result
Proceed to OK NG
Post-procedure1
- None
Result:
NG
REPLACE ENGINE STOP AND START ECU. Refer to REMOVAL [12/2021 - ]
Result:
OK
See step 4
- Disconnect the engine stop and start ECU connectors.
- CHECK VEHICLE CONDITION (B41, B42, B43 AND IG41 CIRCUIT)
- Check that additional devices installed to the vehicle (aftermarket audio system, etc.) are not connected to the B41, B42, B43 or IG41 terminal circuit of the engine stop and start ECU.
Result
Result Proceed to Load from an additional device installed to the vehicle (aftermarket audio system, etc.) is not applied. A Load from an additional device installed to the vehicle (aftermarket audio system, etc.) is applied. B
Result:
A
TROUBLESHOOT ECUS CONNECTED TO TERMINALS B41, B42, B43 AND IG41
Result:
B
END (REMOVE ADDITIONAL DEVICE)
- Check that additional devices installed to the vehicle (aftermarket audio system, etc.) are not connected to the B41, B42, B43 or IG41 terminal circuit of the engine stop and start ECU.