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.
• VSC (VDC) does not operate.
• EyeSight does not operate.

1. CHECK VSC (VDC) CONTROL MODULE & H/U IDENTIFICATION SYMBOL  .

   Check the identification symbol attached on the H/U. Ref. to VEHICLE STABILITY CONTROL>GENERAL DESCRIPTION>SPECIFICATION>VSCCM & H/U .

   Is the identification symbol correct?

   Yes:  Go to  2.

   No:  Replace the VSC (VDC) Control Module & H/U. Ref. to VEHICLE STABILITY CONTROL>VSC (VDC) CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VSCCM & H/U) .

2. CHECK TCM SPECIFICATION  .

   Check the TCM specification.

   Is the specification of TCM same as vehicle specification?

   Yes:  Go to  3.

   No:  Replace the TCM. Ref. to AUTOMATIC TRANSMISSION>TRANSMISSION CONTROL MODULE (TCM) .

3. 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 for [Transmission] displayed?

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

   No:  Go to  4.

4. CHECK ECM SPECIFICATION  .

   Check the ECM specification.

   Is the specification of ECM same as vehicle specification?

   Yes:  Go to  5.

   No:  Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>ENGINE CONTROL MODULE (ECM) .

5. CHECK ENGINE SYSTEM  .
   1. Start the engine.
   2. Read the DTC of [Engine] using the Subaru Select Monitor. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC for [Engine] displayed?

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

   No:  Go to  6.

6. CHECK VSC (VDC) CONTROL MODULE & H/U  .
   1. Using the Subaru Select Monitor, perform the clear memory of [Brake Control]. Ref. to COMMON (DIAGNOSTICS)>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 VSC (VDC) Control Module & H/U. Ref. to VEHICLE STABILITY CONTROL>VSC (VDC) CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VSCCM & H/U) .

   No:  Go to  7.

7. CHECK DETECTION OF OTHER DTCS FOR VSC (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.