- Engine model information sent from the ECM does not match the information stored in the skid control ECU.
- No system information stored in the skid control ECU.
- Incorrect installation of the skid control ECU or ECM.
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018KE7 |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1203; ECM Communication Circuit Malfunction; 2018 - 2020 MY Sienna [11/2017 - ] | ||
|
DTC |
C1203 |
ECM Communication Circuit Malfunction |
DESCRIPTION
This circuit is used to send TRAC and VSC control 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. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1203 |
Any of the following is detected: |
|
CAUTION / NOTICE / HINT
NOTICE:
When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page
![2018 - 2020 MY Sienna [11/2017 - ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CALIBRATION](/t3Portal/stylegraphics/info.gif)
).
PROCEDURE
|
1. |
CHECK PART NUMBER (ECM) |
(a) Check that the proper ECM is installed.
|
Result |
Proceed to |
|---|---|
|
Proper ECM is installed. |
A |
|
Proper ECM are not installed. |
B |
| B |
|
|
|
2. |
CHECK BRAKE ACTUATOR ASSEMBLY |
(a) Check if the skid control ECU (brake actuator assembly) had been replaced before the DTC was recorded.
|
Result |
Proceed to |
|---|---|
|
The skid control ECU (brake actuator assembly) is not replaced. |
A |
|
The skid control ECU (brake actuator assembly) is replaced. |
B |
| B |
|
|
|
3. |
RECONFIRM DTC |
(a) Clear the DTCs (See page
).
(b) Turn the ignition switch off.
(c) Turn the ignition switch to ON.
(d) Check if the same DTC is output (See page
).
|
Result |
Proceed to |
|---|---|
|
DTC C1203 is not output. |
A |
|
DTC C1203 is output. |
B |
| A |
|
| B |
|
|
4. |
PERFORM INITIALIZATION AND CALIBRATION |
(a) Perform initialization and calibration (See page
).
|
|
5. |
RECONFIRM DTC |
(a) Clear the DTCs (See page
).
(b) Turn the ignition switch off.
(c) Turn the ignition switch to ON.
(d) Check if the same DTC is output (See page
).
|
Result |
Proceed to |
|---|---|
|
DTC C1203 is not output. |
A |
|
DTC C1203 is output. |
B |
| A |
|
END |
| B |
|
|
|