Lexus ES: Extreme Hybrid/EV Battery Charging Current (P31B400)
DESCRIPTION
The battery ECU assembly monitors its internal operation, it will set DTCs and perform fail-safe control when it detects the following malfunction.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| P31B400 | Extreme Hybrid/EV Battery Charging Current | An abnormal signal is detected by the battery ECU assembly (excessive charging current). (1 trip detection logic) | Hybrid vehicle control ECU | Does not come on | Master Warning Light: Comes on |
| DTC No. | Data List |
|---|---|
| P31B400 | Hybrid/EV Battery Current |
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.
Click here .gif)
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for 2 minutes or more.
- Turn the power switch on (IG) and turn the Techstream on.
- Drive the vehicle for approximately 10 minutes according to the freeze frame data items "Vehicle Speed", "Accelerator Position", "Hybrid/EV Battery Temperature 1 to 6" and "Hybrid/EV Battery Current".
- 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 or N/A, perform driving pattern again.
PROCEDURE
| 1. | CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Powertrain / HV Battery and Hybrid Control / Trouble Codes.
(d) Check for DTCs.
Powertrain > HV Battery > Trouble Codes Powertrain > Hybrid Control > Trouble Codes| Result | Proceed to |
|---|---|
| "P31B400" only is output. | A |
| DTCs except "P31B400" of hybrid battery system are output. | B |
| DTCs except "P31B400" of hybrid control system are output. | C |
(e) Turn the power 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) |
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Components
COMPONENTS ILLUSTRATION *A for A25A-FKS, A25A-FXS *B for AWD *1 FRONT FRAME ASSEMBLY *2 FUEL DELIVERY GUARD *3 FUEL PUMP PROTECTOR *4 STEERING GEAR HEAT INSULATOR *5 WIRE HARNESS *6 FRONT ENGINE MOUNTING INSULATOR *7 REAR ENGINE MOUNTING INSULATOR -
