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Subaru Crosstrek Service Manual: Dtc u0424 invalid data received from hvac control module

CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC U0424 INVALID DATA RECEIVED FROM HVAC CONTROL MODULE

NOTE:

Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. Basic Diagnostic Procedure">

1. OUTLINE OF DIAGNOSIS

Detect malfunction of CAN communication.

Judge as NG when data received from the A/C control panel is not normal.

2. EXECUTION CONDITION

Secondary parameters

Execution condition

12 V battery system voltage

≥ 10 V

Measured turbine shaft speed

> 0 rpm

or

Transmission range

Drive or Reverse

3. DIAGNOSTIC METHOD

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

Malfunction Criteria

Threshold Value

CAN data from A/C control panel

Freeze

Time Needed for Diagnosis: 2 seconds

Malfunction Indicator Light Illumination: Does not illuminate.

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