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.
• Hill start assist does not operate. (Models without EyeSight)
• AVH does not function. (Models with EyeSight)
• EyeSight does not operate. (Models with EyeSight)

1. CHECK VDC Control Module & 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 VDC Control Module & H/U. Refer to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDC Control Module & H/U) .

2. CHECK PARAMETER SELECTED IN VDC Control Module. 

   Refer to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDC Control Module & H/U)>MAINTENANCE MODE>VDC Control Module PARAMETER CHECK .

   Does the parameter registered in the VDC Control Module match the relevant vehicle?

   Yes:  CVT model: Go to  3.

   MT model: Go to  5.

   No:  Select and register the correct parameter. Refer to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDC Control Module & H/U)>MAINTENANCE MODE>VDC Control Module 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 (TR690)>TRANSMISSION CONTROL MODULE (TCM) .

4. CHECK CVT SYSTEM. 
   1. Start the engine.
   2. Read the DTC of the CVT system. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC of CVT system displayed?

   Yes:  Perform the diagnosis according to DTC. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS)>LIST OF DIAGNOSTIC TROUBLE CODE (DTC) .

   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) (W/O STI)>ENGINE CONTROL MODULE (ECM) . Refer to FUEL INJECTION (FUEL SYSTEMS) (STI)>ENGINE CONTROL MODULE (ECM) .

6. CHECK ENGINE SYSTEM. 
   1. Start the engine.
   2. Read DTC of the engine system. Refer to ENGINE (DIAGNOSTICS) (W/O STI)>READ DIAGNOSTIC TROUBLE CODE (DTC) . Refer to ENGINE (DIAGNOSTICS) (STI)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is engine system DTC displayed?

   Yes:  Perform the diagnosis according to DTC. Refer to ENGINE (DIAGNOSTICS) (W/O STI)>LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . Refer to ENGINE (DIAGNOSTICS) (STI)>LIST OF DIAGNOSTIC TROUBLE CODE (DTC) .

   No:  Go to  7.

7. CHECK VDC Control Module & H/U. 
   1. Connect all connectors.
   2. Perform the Clear Memory Mode. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>CLEAR MEMORY MODE .
   3. Perform the Inspection Mode. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>INSPECTION MODE .
   4. Read the DTC. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is the same DTC displayed?

   Yes:  Replace the VDC Control Module & H/U. Refer to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDC Control Module & H/U) .

   No:  Go to  8.

8. CHECK DETECTION OF OTHER DTCS FOR VDC. 

   Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is any other DTC displayed?

   Yes:  Perform the diagnosis according to DTC. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>LIST OF DIAGNOSTIC TROUBLE CODE (DTC) .

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