ECM Communication Circuit Malfunction - Electronically Controlled Brake System

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1203/95: ECM Communication Circuit Malfunction
C1203/95 - ECM Communication Circuit Malfunction

DESCRIPTION

This circuit is used to send TRAC and VSC information from the skid control ECU to the hybrid vehicle control ECU, and hybrid control system information from the hybrid vehicle control ECU to the skid control ECU via the CAN communication system.





INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU, perform initialization and calibration of the linear solenoid valve Initialization.

PROCEDURE

1. PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE

(a) Perform initialization and calibration of the linear solenoid valve Initialization.

HINT
Before carrying out Perform Initialization and Calibration of Linear Solenoid Valve, C1203/95 will be output.

NEXT -- Continue to next step.

2. RECONFIRM DTC

(a) Turn the ignition switch off.

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Turn the ignition switch to ON.

(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- END
A -- Continue to next step.

3. CHECK PART NUMBER

(a) Turn the ignition switch off.

(b) Check that a proper hybrid vehicle control ECU is installed.

OK:

Proper ECU is installed.

(c) Check if the hybrid vehicle control ECU was replaced before the DTC was recorded.

OK:

ECU was not replaced.

Result:





B -- REPLACE HYBRID VEHICLE CONTROL ECU Removal
A -- Continue to next step.

4. CHECK PART NUMBER (SKID CONTROL ECU)

(a) Check that a proper skid control ECU is installed.

OK:

Proper skid control ECU is installed.

(b) Check if the skid control ECU was replaced before the DTC was recorded.

OK:

Skid control ECU was not replaced.

Result:





C -- REPLACE SKID CONTROL ECU Removal

B -- PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE Initialization
A -- Continue to next step.

5. RECONFIRM DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the ignition switch to ON.

(c) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- REPLACE SKID CONTROL ECU Removal

A -- CHECK FOR INTERMITTENT PROBLEMS How To Proceed With Troubleshooting