- CAN communication system (Skid control ECU to ECM)
- Brake actuator assembly (Skid control ECU)
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VIWF |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 11/2017] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1437; Lost Communication with ECM; 2016 - 2017 MY Sienna [12/2015 - 11/2017] | ||
|
DTC |
C1437 |
Lost Communication with ECM |
DESCRIPTION
The skid control ECU receives signals from the ECM via the CAN communication system.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1437 |
When the IG1 terminal voltage is 10 V or more and the vehicle speed is 15 km/h (9 mph) or more, data cannot be sent to the ECM for 2 seconds or more. |
|
WIRING DIAGRAM
Refer to DTCs U0073, U0100, U0123, U0124 and U0126 (See page
![2016 MY Sienna [12/2015 - 08/2016]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: U0073,U0100,U0123,U0124,U0126; Control Module Communication Bus OFF+](/t3Portal/stylegraphics/info.gif)
).
CAUTION / NOTICE / HINT
NOTICE:
When replacing the brake actuator assembly, perform zero point calibration and store system information (See page
).
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 |
EFI communication open detection / Error or Normal |
Error: Momentary interruption 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) 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 |
|
DTC (CAN communication system DTC) is output |
C |
| A |
|
CHECK FOR INTERMITTENT PROBLEMS (See page
|
| B |
|
| C |
|
INSPECT CAN COMMUNICATION SYSTEM (See page
|
|
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 |
|
DTC (CAN communication system DTC) is output |
C |
| A |
|
END |
| B |
|
| C |
|
INSPECT CAN COMMUNICATION SYSTEM (See page
|
|
|