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BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS VEHICLE STABILITY CONTROL SYSTEM C1203 ECM Communication Circuit Malfunction
DESCRIPTION
This circuit is used to send TRC and VSC operation information from the skid control ECU (brake actuator assembly) to the ECM, and engine control information from the
ECM to the skid control ECU (brake actuator assembly) via CAN communication.
DTC No. Detection Item DTC Detection Condition Trouble Area
Either of the following is detected:
1. Engine, drive source and destination variations that are · The wrong ECU was installed
C1203 ECM Communication Circuit Malfunction sent from the ECM do not match the ones of the skid · Skid control ECU (brake actuator
control ECU (brake actuator assembly). assembly)
2. No stored information for destination.
CAUTION / NOTICE / HINT
NOTICE:
When replacing the skid control ECU (brake actuator assembly), perform zero point calibration.
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>VEHICLE STABILITY CONTROL SYSTEM>CALIBRATION
PROCEDURE
1.CHECK PART NUMBER (ECM)
a. Check that the proper ECM is installed.
OK:
Proper ECM is installed.
b. Check if the ECM was replaced before the DTC was stored.
OK:
ECM was not replaced.
Result:
Result Proceed to
OK A
NG (A proper ECM is not installed and/or the ECM was replaced.) B
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2.CHECK PART NUMBER (BRAKE ACTUATOR ASSEMBLY)
REPLACE ECM
for 1ZR-FE: Click hereEngine / Hybrid System>1ZR-FE ENGINE CONTROL>ECM>REMOVAL
for 2ZR-FE: Click hereEngine / Hybrid System>2ZR-FE ENGINE CONTROL>ECM>REMOVAL
for 3ZR-FE: Click hereEngine / Hybrid System>3ZR-FE ENGINE CONTROL>ECM>REMOVAL
for 1ZR-FAE: Click hereEngine / Hybrid System>1ZR-FAE ENGINE CONTROL>ECM>REMOVAL
2.CHECK PART NUMBER (BRAKE ACTUATOR ASSEMBLY)
a. Check that a proper skid control ECU (brake actuator assembly) is installed.
OK:
Proper skid control ECU (brake actuator assembly) is installed.
b. Check if the skid control ECU (brake actuator assembly) had been replaced before the DTC was recorded.
OK:
Skid control ECU (brake actuator assembly) had not been replaced.
Result:
Result Proceed to
OK A
NG (The skid control ECU (brake actuator assembly) had been replaced.) B
NG (A proper skid control ECU (brake actuator assembly) is not installed.) C
3.RECONFIRM DTC
PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>VEHICLE STABILITY CONTROL SYSTEM>CALIBRATION
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REPLACE BRAKE ACTUATOR ASSEMBLY
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE ACTUATOR(except TDB, TDV Made)>REMOVAL
3.RECONFIRM DTC
a. Clear the DTCs.
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>VEHICLE STABILITY CONTROL SYSTEM>DTC CHECK / CLEAR
Chassis > ABS/VSC/TRC > Clear DTCs
Execute
b. Turn the ignition switch off.
c. Turn the ignition switch to ON.
d. Check if the same DTC is output.
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>VEHICLE STABILITY CONTROL SYSTEM>DTC CHECK / CLEAR
Chassis > ABS/VSC/TRC > Trouble Codes
Execute
Result:
Result Proceed to
DTC C1203 is not output. A
DTC C1203 is output. B
USE SIMULATION METHOD TO CHECK
Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING
REPLACE BRAKE ACTUATOR ASSEMBLY
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE ACTUATOR(except TDB, TDV Made)>REMOVAL
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