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 U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" | 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 U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" |
3.CHECK DTC. Check the displayed DTC. | Is DTC for the bus off or the data no-receive displayed- | Perform the diagnosis according to DTC. | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" |
4.CHECK DTC. Check the displayed DTC. | Is U0401 a current malfunction- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" |
5.CHECK DTC. 1) Turn the ignition switch to OFF. 2) Disconnect the ECM connector. 3) Connect the disconnected connectors. 4) Read the DTC using Subaru Select Monitor. | Is U0401 a current malfunction- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" |
6.CHECK DTC. Using the Subaru Select Monitor, read DTC of all the systems. | Is the engine data abnormal detected in several modules- | Replace the ECM. Engine Control Module (ECM) Engine Control Module (ECM) | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" |
7.REPLACE MODULE. 1) Replace the ECM. Engine Control Module (ECM) Engine Control Module (ECM) 2) Read the DTC using Subaru Select Monitor. | Is U0401 a current malfunction- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" | |
8.CHECK MODULE. 2) Replace the module that the DTC has been detected. 3) Read the DTC using Subaru Select Monitor. | Is U0401 a current malfunction- | Replace the ECM. Engine Control Module (ECM) Engine Control Module (ECM) | |
9.CHECK HARNESS. 1) Shake the harness, and check for poor contact. 2) Using the Subaru Select Monitor, read DTC of CAN system. | Is U0401 a current malfunction- | Repair the poor contact of harness, or replace the harness. | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" |
10.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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