Dtc C1437 Lost Communication With Ecm


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 Code
DTC Detection Condition
Trouble Area
C1437
When the IG1 terminal voltage is 10 V or higher and the vehicle speed is 15 km/h (9 mph) or more, data cannot be sent from 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:
After replacing the brake actuator assembly, perform calibration (Toyota Fortuner RM000000XHR06WX.html).
1.CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

  1. Using the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to the DTC (Toyota Fortuner RM000000XHS0A8X.html).

    ABS/VSC/TRC
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    EFI Communication Open
    		ECM communication open circuit detection / Error or Normal
    		Normal
    		-

    OK:
    Normal (there are no momentary interruptions).
    HINT:
    Perform the above inspection before removing the ECUs or disconnecting a connector.


NG
Go to step 3
OK


2.RECONFIRM DTC

  1. Clear the DTC (Toyota Fortuner RM000000XHV0C7X.html).

  1. Turn the ignition switch off.

  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 (Toyota Fortuner RM000000XHV0C7X.html).

  1. Check if the same DTC is output (Toyota Fortuner RM000000XHV0C7X.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 (Toyota Fortuner RM0000010K0010X.html)

C
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (Toyota Fortuner RM000002VT000OX.html)
A

USE SIMULATION METHOD TO CHECK (Toyota Fortuner RM0000012Q9013X.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 ECM (Toyota Fortuner RM000000XHS0A8X.html).

  1. Confirm that there is no momentary interruption.


NEXT


4.RECONFIRM DTC

  1. Clear the DTC (Toyota Fortuner RM000000XHV0C7X.html).

  1. Turn the ignition switch off.

  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 (Toyota Fortuner RM000000XHV0C7X.html).

  1. Check if the same DTC is output (Toyota Fortuner RM000000XHV0C7X.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 (Toyota Fortuner RM0000010K0010X.html)

C
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (Toyota Fortuner RM000002VT000OX.html)
A

END