DTC C1423: Different Ecu Specifications

DTC detecting condition: 

A fault is detected if the vehicle type information obtained from ECM via communication is different from the parameter setting information.

Trouble symptom: 

• ABS does not operate.
• VDC does not operate.
• AVH does not function.
• EyeSight does not operate.
  NOTE: When parameter selection for VDCCM is improper, this DTC may be memorized.

1. CHECK VDCCM & H/U IDENTIFICATION SYMBOL. 

   Check the identification symbol attached on the H/U. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>GENERAL DESCRIPTION>SPECIFICATION .

   Is the identification symbol correct?

   Yes  : Go to  2.

   No  : Replace the VDCCM & H/U. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U) .

2. CHECK PARAMETER SELECTED IN VDCCM. 

   Check the VDCCM parameters. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U)>MAINTENANCE MODE>VDCCM PARAMETER CHECK .

   Does the parameter registered in the VDCCM match the relevant vehicle?

   Yes  : Go to  3.

   No  : Select and register the correct parameter. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U)>MAINTENANCE MODE>VDCCM PARAMETER SELECTION .

3. CHECK TCM SPECIFICATION. 

   Check the TCM specification.

   Is the specification of TCM same as vehicle specification?

   Yes  : Go to  4.

   No  : Replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION CONTROL MODULE (TCM) .

4. CHECK CVT SYSTEM. 
   1. Start the engine.
   2. Using the Subaru Select Monitor, read DTC of CVT system. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC of CVT system displayed?

   Yes  : Perform the diagnosis according to DTC. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

   No  : Go to  5.

5. CHECK ECM SPECIFICATION. 

   Check the ECM specification.

   Is the specification of ECM same as vehicle specification?

   Yes  : Go to  6.

   No  : Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>ENGINE CONTROL MODULE (ECM) .

6. CHECK ENGINE SYSTEM. 
   1. Start the engine.
   2. Read the DTC of engine system using the Subaru Select Monitor. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is engine system DTC displayed?

   Yes  : Perform the diagnosis according to DTC. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

   No  : Go to  7.

7. CHECK VDCCM & H/U. 
   1. Using the Subaru Select Monitor, perform the clear memory. Ref. to COMMON (diag)>CLEAR MEMORY .
   2. Execute the inspection mode. Ref. to BRAKE CONTROL (DIAGNOSTICS)>INSPECTION MODE .
   3. Read the DTC using Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is the same DTC displayed?

   Replace the VDCCM & H/U. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U) .

   No  : Go to  8.

8. CHECK DETECTION OF OTHER DTCS FOR VDC. 

   Read the DTC using Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is any other DTC displayed?

   Yes  : Perform the diagnosis according to DTC. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

   No  : Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.