Lexus ES manuals

Lexus ES: Lost Communication with Hybrid/EV Powertrain Control Module Missing Message (U029387)

Lexus ES (XZ10) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Battery System (for Lithium-ion Battery) / Lost Communication with Hybrid/EV Powertrain Control Module Missing Message (U029387)

DESCRIPTION

The battery ECU assembly transmits and receives signals via CAN communication to and from the hybrid vehicle control ECU.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

U029387

Lost Communication with Hybrid/EV Powertrain Control Module Missing Message

A CAN communication error between the battery ECU assembly and hybrid vehicle control ECU (CAN communication system malfunction) occurs

(1 trip detection logic)

CAN communication system

Comes on

Master Warning Light:

Comes on

MONITOR DESCRIPTION

If the battery ECU assembly cannot communicate with the hybrid vehicle control ECU via CAN communication, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

U0293 (INF U029387): Lost communication with Hybrid control module

Required sensors/components

Battery ECU assembly

Frequency of operation

Continuous

Duration

TMC's intellectual property

MIL operation

Immediately

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored

TMC's intellectual property

Other conditions belong to TMC's intellectual property

-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

-

COMPONENT OPERATING RANGE

Battery ECU assembly

DTC U0293 (INF U029387) is not detected

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off and wait for 2 minutes or more.
  5. Turn the power switch on (IG) and turn the Techstream on.
  6. With power switch on (IG) and wait for 2 minutes or more.[*1]

    HINT:

    [*1]: Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  7. Enter the following menus: Powertrain / HV Battery / Utility / All Readiness.
  8. 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 the normal judgment procedure again.

PROCEDURE

1.

CHECK DTC OUTPUT (HV BATTERY)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / HV Battery / Trouble Codes.

(d) Check for DTCs.

Powertrain > HV Battery > Trouble Codes

(e) Turn the power switch off.

NEXT

GO TO CAN COMMUNICATION SYSTEM

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