- CAN communication system (skid control ECU to ECM)
- Skid control ECU (brake actuator assembly)
- ECM
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018KF0 |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1437; Lost Communication with ECM; 2018 - 2020 MY Sienna [11/2017 - ] | ||
|
DTC |
C1437 |
Lost Communication with ECM |
DESCRIPTION
The skid control ECU (brake actuator assembly) receives signals from the ECM via the CAN communication system.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1437 |
When voltage at terminal +BS is 10 to 17.4 V and vehicle speed is 15 km/h (9 mph) or more, data cannot be sent to ECM continuously for 2 seconds or more. |
|
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 HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION) |
(a) Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to the DTC (See page
).
ABS/VSC/TRAC
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
EFI Communication Open |
ECM communication open detection / Error or Normal |
Error: Momentary interruption Normal: Normal |
- |
|
EFI Communication Invalid |
ECM communication invalid detection / Error or Normal |
Error: Invalid Normal: Normal |
- |
OK:
There are no momentary interruptions.
HINT:
Perform the above inspection before removing the sensor and connector.
| NG |
|
|
|
2. |
RECONFIRM DTC |
(a) Turn the ignition switch off.
(b) Clear the DTCs (See page
).
(c) Turn the ignition switch off.
(d) Start the engine.
(e) Drive the vehicle at a speed of 15 km/h (9 mph) or more for 10 seconds or more.
(f) Check that no CAN communication system DTC is output (See page
).
(g) Check if the same DTC is output (See page
).
|
Result |
Proceed to |
|---|---|
|
DTC C1437 is not output. |
A |
|
DTC C1437 is output. |
B |
|
CAN communication system DTCs are output. |
C |
| A |
|
| B |
|
| C |
|
|
3. |
REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - ECM) |
(a) Turn the ignition switch off.
(b) Repair or replace the harness or connector.
(c) Check for any momentary interruption between the skid control ECU and the ECM (See page
).
(d) Check that there is no momentary interruption.
|
|
4. |
RECONFIRM DTC |
(a) Turn the ignition switch off.
(b) Clear the DTCs (See page
).
(c) Start the engine.
(d) Drive the vehicle at a speed of 15 km/h (9 mph) or more for 10 seconds or more.
(e) Check that no CAN communication system DTC is output (See page
).
(f) Check if the same DTC is recorded (See page
).
Result
|
Result |
Proceed to |
|---|---|
|
DTC C1437 is not output. |
A |
|
DTC C1437 is output. |
B |
|
CAN communication system DTCs are output. |
C |
| A |
|
END |
| B |
|
| C |
|
|
|