Honda Civic manuals

Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc u0164 lost communication with hvac control module

DTC DETECTING CONDITION:

No data is received from A/C CM.

TROUBLE SYMPTOM:

Cooperation control of air conditioner does not operate properly.

STEPCHECKYESNO

1.CHECK PERFORMING OF BASIC DIAGNOSTIC PROCEDURE.

Was the basic diagnostic procedure performed up to STEP 8-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0164 LOST COMMUNICATION WITH HVAC CONTROL MODULE

Perform the basic diagnostic procedure. Basic Diagnostic Procedure

2.CHECK DTC.

Check the displayed DTC.

Are DTCs other than U*** displayed-

Perform the diagnosis according to DTC.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0164 LOST COMMUNICATION WITH HVAC CONTROL MODULE

3.CHECK DTC.

Check the displayed DTC.

Is U0164 a current malfunction-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0164 LOST COMMUNICATION WITH HVAC CONTROL MODULE

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0164 LOST COMMUNICATION WITH HVAC CONTROL MODULE

4.CHECK DTC.

1) Check CAN communication circuit. CAN Communication Circuit Check

2) Read the DTC using Subaru Select Monitor.

Is U0164 a current malfunction-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0164 LOST COMMUNICATION WITH HVAC CONTROL MODULE

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0164 LOST COMMUNICATION WITH HVAC CONTROL MODULE

5.CHECK DTC.

Using the Subaru Select Monitor, read DTC of all the systems.

Is the air conditioner data no-receive detected in several modules-

Replace the A/C CM. Control Unit

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0164 LOST COMMUNICATION WITH HVAC CONTROL MODULE

6.REPLACE MODULE.

1) Replace the A/C CM.

2) Read the DTC using Subaru Select Monitor.

Is U0164 a current malfunction-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0164 LOST COMMUNICATION WITH HVAC CONTROL MODULE

System is normal.

7.CHECK MODULE.

1) Reinstall the A/C CM.

2) Replace the module that the DTC has been detected.

3) Read the DTC using Subaru Select Monitor.

Is U0164 a current malfunction-

Replace the A/C CM. Control Unit

System is normal.

8.CHECK HARNESS.

1) Shake the harness, and check for poor contact.

2) Read the DTC using Subaru Select Monitor.

Is U0164 a current malfunction-

Repair the poor contact of harness, or replace the harness.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0164 LOST COMMUNICATION WITH HVAC CONTROL MODULE

9.CHECK CONNECTOR.

Check the connector used for high speed CAN for poor contact.

Is there poor contact of connector-

Repair the connector that has poor contact, or replace harness.

It is possible that temporary poor communication occurs. Delete the DTC.

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Other materials:

Installation
1. RH SIDE1. Install the spark plugs using a spark plug socket.Tightening torque:18 N·m (1.8 kgf-m, 13.3 ft-lb)2. Install the ignition coil.CAUTION:Degrease the ignition coil fixing portion and the ignition coil mounting bolt.Tightening torque:8.0 N·m (0.8 kgf-m, 5.9 ft-lb)3. Connect t ...

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