Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM10000000104IG
Model Year Start: 2017 Model: Sienna Prod Date Range: [08/2016 - 11/2017]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1203,C1270; ECM Communication Circuit Malfunction; 2017 MY Sienna [08/2016 - 11/2017]

DTC

C1203

ECM Communication Circuit Malfunction

DTC

C1270

Initialization Incomplete (Test Mode DTC)

DESCRIPTION

This circuit is used to send TRAC 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 Code

DTC Detection Condition

Trouble Area

C1203

Either of the following is detected:

  1. Engine and drive source that are sent from the ECM do not match the ones of the skid control ECU (brake actuator assembly).
  2. No stored information for engine and drive source.
  • The wrong ECU was installed
  • Skid control ECU (brake actuator assembly)

C1270

Detected only during Test Mode.

  • ECM
  • CAN communication system (skid control ECU to ECM)
  • Skid control ECU (brake actuator assembly)

CAUTION / NOTICE / HINT

NOTICE:

When replacing the brake actuator assembly, perform zero point calibration and store system information (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; 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

B

REPLACE ECM

A

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

B

PERFORM ZERO POINT CALIBRATION AND STORE SYSTEM INFORMATION OF YAW RATE AND ACCELERATION SENSOR

C

REPLACE BRAKE ACTUATOR ASSEMBLY

A

3.

CLEAR AND STORE SYSTEM INFORMATION

(a) Clear the system information.

(b) Store the system information.

NEXT

4.

RECONFIRM DTC

(a) Clear the DTCs (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR ).

(b) Turn the ignition switch off.

(c) Turn the ignition switch to ON.

(d) Check if the same DTC is output.

Check if the same DTC is output (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR ).

Result

Result

Proceed to

DTC (C1203) is not output

A

DTC (C1203) is output

B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY