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.

1. CHECK VDCCM AND 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 and H/U. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM and 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 and 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 and 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 (TR580)>TRANSMISSION CONTROL MODULE (TCM) . Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION CONTROL MODULE (TCM) .

4. CHECK CVT SYSTEM  .
   1. Start the engine.
   2. Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC of CVT system displayed?

   Yes:  Perform the diagnosis according to the 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) (H4DO)>ENGINE CONTROL MODULE (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 Control System] using the Subaru Select Monitor. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>DIAGNOSTIC TROUBLE CODE (DTC) . Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is engine system DTC displayed?

   Yes:  Perform the diagnosis according to the DTC. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST . Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

   No:  Go to  7 .

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

   Is the same DTC displayed?

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

   No:  Go to  8 .

8. CHECK DETECTION OF OTHER DTCS FOR VDC  .

   Read the DTC of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is any other DTC displayed?

   Yes:  Perform the diagnosis according to the 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.