Dtc C1437 Lost Communication With Ecm

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

DESCRIPTION

WIRING DIAGRAM

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 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.
  1. CAN communication system (Skid control ECU to ECM)
  2. Brake actuator assembly (Skid control ECU)

WIRING DIAGRAM

Refer to DTCs U0073, U0100, U0123, U0124 and U0126 (YARIS_NCP93 RM000000YUO0DIX_03.html).

INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (YARIS_NCP93 RM000000XHR06QX.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 RM000000XHS09YX.html).

    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
Go to step 3
OK


2.RECONFIRM DTC

  1. Turn the ignition switch off.

  1. Clear the DTCs (YARIS_NCP93 RM000000XHV0BQX.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 RM000001D3E00OX.html).

  1. Check if the same DTC is recorded (YARIS_NCP93 RM000000XHV0BQX.html).

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



B
REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02FX.html)

C
CHECK CAN COMMUNICATION SYSTEM (YARIS_NCP93 RM000001D3500JX.html)
A

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (YARIS_NCP93 RM000000XHS09YX.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 and the ECM (YARIS_NCP93 RM000000XHS09YX.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 RM000000XHV0BQX.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 RM000001D3E00OX.html).

  1. Check if the same DTC is recorded (YARIS_NCP93 RM000000XHV0BQX.html).

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



B
REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02FX.html)

C
CHECK CAN COMMUNICATION SYSTEM (YARIS_NCP93 RM000001D3500JX.html)
A

END