Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: HVAC Control Module to Hybrid Powertrain Control Module Invalid Serial Data Received (U042481)

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Control System / HVAC Control Module to Hybrid Powertrain Control Module Invalid Serial Data Received (U042481)

DESCRIPTION

If the hybrid vehicle control ECU receives an invalid compressor control request from the air conditioning amplifier assembly via CAN communication, it will store this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

U042481

HVAC Control Module to Hybrid Powertrain Control Module Invalid Serial Data Received

An invalid control request was received from the air conditioning amplifier assembly

(1 trip detection logic)

Air conditioning amplifier assembly

Does not come on

Master Warning:

Does not come on

SAE Code:

U0424

CONFIRMATION DRIVING PATTERN

HINT:

After repair has 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

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off and wait for 2 minutes or more.
  5. Turn the ignition switch to ON and turn the GTS on.
  6. Wait for 1 minute or more with the vehicle stopped, the ignition switch to ON (READY), the shift lever in P and the air conditioning system on (Lo/COOL MAX, blower speed HI).
  7. Turn the air conditioning system off and wait for 10 seconds or more with the ignition switch ON (READY).
  8. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  9. 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 (AIR CONDITIONER)

(a) Check if DTCs related to the Air Conditioning System (A/C) are output.

Body Electrical > Air Conditioner > Trouble Codes
Result

Proceed to

DTCs related to Air Conditioning System (A/C) are not output.

A

DTCs related to Air Conditioning System (A/C) are output.

B

(b) Turn the ignition switch off.

A

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

B

GO TO DTC CHART (AIR CONDITIONING SYSTEM)

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