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&H/U IDENTIFICATION SYMBOL  .

   Check the identification symbol attached on the H/U. Refer to VEHICLE DYNAMICS CONTROL (VDC)>General Description>SPECIFICATION .

   Is the identification symbol correct?

   Yes  : Go to  2.

   No  : Replace the VDCCM&H/U. Refer 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. Refer 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. Refer 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. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TRANSMISSION CONTROL MODULE (TCM) . Refer 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. Refer to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

      Is DTC of CVT system displayed?

      Yes  : Perform the diagnosis according to the DTC. Refer 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. Refer to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Control Module (ECM) . Refer 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. Refer to ENGINE (DIAGNOSTICS) (H4DO)>Diagnostic Trouble Code (DTC) . Refer to ENGINE (DIAGNOSTICS) (H4DOTC)>Diagnostic Trouble Code (DTC) .

      Is engine system DTC displayed?

      Yes  : Perform the diagnosis according to the DTC. Refer to ENGINE (DIAGNOSTICS) (H4DO)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST . Refer 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 of [Brake Control]. Refer to COMMON (DIAG)>CLEAR MEMORY .
   2. Execute the inspection mode. Refer to BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode .
   3. Read the DTC of [Brake Control] using the Subaru Select Monitor. Refer to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

      Is the same DTC displayed?

      Yes  : Replace the VDCCM&H/U. Refer 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 of [Brake Control] using the Subaru Select Monitor. Refer to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is any other DTC displayed?

   Yes  : Perform the diagnosis according to the DTC. Refer 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.