Dtc C1437 Lost Communication With Ecm

Brake. Yaris. Ncp93, 131
Brake Control Dynamic Control Systems. Yaris. Ncp93, 131

DESCRIPTION

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

RECONFIRM DTC

REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - ECM)

RECONFIRM DTC

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 No.
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.
  1. CAN communication system (Skid control ECU to ECM)
  2. Skid control ECU (Brake actuator assembly)

INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (YARIS_NCP93 RM000000XHR078X.html).
1.CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

  1. Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to the DTC (YARIS_NCP93 RM000000XHS0ANX.html).

    ABS/VSC/TRAC
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    EFI Communication Open
    		EFI communication open detection/Normal or Error
    		Normal: Normal
    Error: Momentary interruption
    		-

    OK:
    There are no momentary interruptions.
    HINT:
    Perform the above inspection before removing the sensor and connector.


NG
Go to step 3
OK


2.RECONFIRM DTC

  1. Turn the ignition switch off.

  1. Clear the DTCs (YARIS_NCP93 RM000000XHV0CQX.html).

  1. Start the engine.

  1. Drive the vehicle at a speed of 15 km/h (9 mph) or more for 10 seconds or more.

  1. Check that no CAN communication system DTC is output (YARIS_NCP93 RM000001RSW02LX.html).

  1. Check if the same DTC is recorded (YARIS_NCP93 RM000000XHV0CQX.html).

Result
Result
Proceed to
DTC C1437 is not output
A
DTC C1437 is output
B
CAN communication system DTC is output
C


B
REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02KX.html)

C
CHECK CAN COMMUNICATION SYSTEM (YARIS_NCP93 RM000001RSO066X.html)
A

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (YARIS_NCP93 RM000000XHS0ANX.html)

3.REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - ECM)

  1. Turn the ignition switch off.

  1. Repair or replace the harness or connector.

  1. Check for any momentary interruption between the skid control ECU (brake actuator assembly) and the ECM (YARIS_NCP93 RM000000XHS0ANX.html).

  1. Check that there is no momentary interruption.


NEXT


4.RECONFIRM DTC

  1. Turn the ignition switch off.

  1. Clear the DTCs (YARIS_NCP93 RM000000XHV0CQX.html).

  1. Start the engine.

  1. Drive the vehicle at a speed of 15 km/h (9 mph) or more for 10 seconds or more.

  1. Check that no CAN communication system DTC is output (YARIS_NCP93 RM000001RSW02LX.html).

  1. Check if the same DTC is recorded (YARIS_NCP93 RM000000XHV0CQX.html).

Result
Result
Proceed to
DTC C1437 is not output
A
DTC C1437 is output
B
CAN communication system DTC is output
C


B
REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02KX.html)

C
CHECK CAN COMMUNICATION SYSTEM (YARIS_NCP93 RM000001RSO066X.html)
A

END