Dtc C1437 Lost Communication With Ecm

Brake. Corolla. Zre142 Aze141
Brake Control Dynamic Control Systems. Corolla. Zre142 Aze141

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 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)

INSPECTION PROCEDURE

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 (COROLLA_ZRE142 RM000000XHS0CJX.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 (COROLLA_ZRE142 RM000000XHV0F2X.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 (COROLLA_ZRE142 RM000000WIB0BUX.html).

  1. Check if the same DTC is recorded (COROLLA_ZRE142 RM000000XHV0F2X.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 (COROLLA_ZRE142 RM000003CZU00MX.html)

C
INSPECT CAN COMMUNICATION SYSTEM (COROLLA_ZRE142 RM000000WI60ACX.html)
A

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (COROLLA_ZRE142 RM000000XHP0EKX.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 (COROLLA_ZRE142 RM000000XHS0CJX.html).

  1. Check that there is no momentary interruption.


NEXT


4.RECONFIRM DTC

  1. Turn the ignition switch off.

  1. Clear the DTCs (COROLLA_ZRE142 RM000000XHV0F2X.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 (COROLLA_ZRE142 RM000000WIB0BUX.html).

  1. Check if the same DTC is recorded (COROLLA_ZRE142 RM000000XHV0F2X.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 (COROLLA_ZRE142 RM000003CZU00MX.html)

C
INSPECT CAN COMMUNICATION SYSTEM (COROLLA_ZRE142 RM000000WI60ACX.html)
A

END