Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc u0424 invalid data received from hvac control module

Subaru Legacy BN/BS (2015-2019) Service Manual / 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
Turbine shaft speed	> 0 rpm
or
D range switch	ON

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

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Caution
• Before disconnecting connectors of sensors or units, be sure to disconnect the ground cable from battery.• When replacing the parts provided with memory functions such as audio, record the memory contents before disconnecting the battery ground cable.• Be careful of the following ...