Lexus NX manuals

Lexus NX: Lost Communication with Instrument Panel Cluster Control Module (Combination Meter) (U0155)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (engine Control) / Sfi System / Lost Communication with Instrument Panel Cluster Control Module (Combination Meter) (U0155)

DESCRIPTION

The ECM and combination meter assembly send and receiver signals via CAN communication.

If a communication error occurs between the ECM and combination meter assembly, the ECM illuminates the MIL and stores this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

U0155

Lost Communication with Instrument Panel Cluster Control Module (Combination Meter)

All of the following conditions are met for 2.6 seconds or more (1 trip detection logic).

  • Power switch on (IG)
  • Auxiliary battery voltage is 10 V or higher
  • No communication between ECM and combination meter assembly
  • CAN communication system
  • Combination meter assembly
  • ECM

Comes on

DTC stored

MONITOR STRATEGY

Related DTCs

U0155: Lost communication with instrument panel cluster control module (verify communication)

Required Sensors/Components (Main)

ECM

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

2.6 seconds

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

None

Auxiliary battery voltage

10 V or higher

Power switch

On (IG)

TYPICAL MALFUNCTION THRESHOLDS

Communication signal

Lost communication with instrument panel cluster control module

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the power switch off and wait for at least 30 seconds.
  6. Turn the power switch on (IG).
  7. Turn the Techstream on.
  8. Wait 5 seconds or more.
  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
  10. Read the DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  12. Input the DTC: U0155.
  13. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL
    • DTC judgment completed
    • System normal

    ABNORMAL
    • DTC judgment completed
    • System abnormal

    INCOMPLETE
    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A
    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system has a malfunction.
  14. If the test result is INCOMPLETE or N/A and no DTC is output, perform a universal trip and check for permanent DTCs

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

CAUTION / NOTICE / HINT

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.

GO TO CAN COMMUNICATION SYSTEM

(a) Refer to the CAN Communication System.

Click here

NEXT

END

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