Toyota Corolla Cross: Hybrid/EV Battery Internal Electronic Failure (P31B549)
DESCRIPTION
The battery ECU assembly monitors its internal operation and will store these DTCs when it detects an internal malfunction.
|
DTC No. | Detection Item |
DTC Detection Condition |
Trouble Area | MIL |
Warning Indicate | Note |
|---|---|---|---|---|---|---|
|
P31B549 | Hybrid/EV Battery Internal Electronic Failure |
An abnormal signal is detected by the battery ECU assembly (excessive discharging current). (1 trip detection logic) |
Hybrid vehicle control ECU |
Does not come on | Master Warning: Comes on | SAE Code: P31B5 |
CONFIRMATION DRIVING PATTERN
HINT:
After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
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- Connect the GTS to the DLC3.
- Turn the ignition switch to ON and turn the GTS on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the ignition switch off and wait for 2 minutes or more.
- Turn the ignition switch to ON and turn the GTS on.
- Drive the vehicle on urban roads for approximately 10 minutes.
- Enter the following menus: Powertrain / HV battery / Utility / All Readiness.
- Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE, perform driving pattern again.
PROCEDURE
|
1. | CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL) |
(a) Check for DTCs.
Powertrain > HV Battery > Trouble Codes Powertrain > Hybrid Control > Trouble Codes|
Result | Proceed to |
|---|---|
|
"P31B549" only is output. |
A |
| DTCs except "P31B549" of hybrid battery system are output. |
B |
| DTCs except "P31B549" of hybrid control system are output. |
C |
(b) Turn the ignition switch off.
| A | .gif) | REPLACE HYBRID VEHICLE CONTROL ECU |
| B | | GO TO DTC CHART (HYBRID BATTERY SYSTEM) |
| C | | GO TO DTC CHART (HYBRID CONTROL SYSTEM) |
READ NEXT:
Hybrid/EV Battery Stack 1 Circuit Resistance Out of Range (P33DA1E,P33DB1E)
DESCRIPTION The HV battery is composed of 60 cells (3.7 V each) in series. The battery ECU assembly monitors the internal resistance of each HV battery cell to detect malfunctions of the HV battery.
Hybrid/EV Battery Stack 1 Circuit Resistance Above Threshold (P33E01B,P33E11B)
DESCRIPTION The HV battery is composed of 60 cells (3.7 V each) in series. The battery ECU assembly monitors the internal resistance of each HV battery cell to detect malfunctions of the HV battery.
Hybrid/EV Battery Stack 1 Capacity Decline (P33E600,P33E700)
DESCRIPTION The HV battery is composed of 60 cells (3.7 V each) in series. The battery ECU assembly monitors the capacity of each HV battery cell to detect malfunctions of the HV battery.
DTC N
SEE MORE:
Inspection
INSPECTION PROCEDURE 1. INSPECT ENGINE OIL LEVEL SENSOR
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection Condition
Specified Condition
1 - Engine oil level sensor body
ON Below 1 Ω
OFF
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use the following procedure to troubleshoot the acoustic vehicle alerting system.
*: Use the GTS.
PROCEDURE
1. VEHICLE BROUGHT TO WORKSHOP
NEXT
2.
CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK
HINT:
In troublesho
