Can Communication System Ecm Communication Stop Mode

Power Source Network. Corolla. Zre142 Aze141
Networking. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR OPEN IN CAN NO. 1 BUS MAIN WIRE (ECM MAIN WIRE)

CHECK WIRE HARNESS (POWER SOURCE CIRCUIT)

CAN COMMUNICATION SYSTEM - ECM Communication Stop Mode


DESCRIPTION


Detection Item
Symptom
Trouble Area
ECM Communication Stop Mode
  1. "Engine" is not displayed on the "CAN Bus Check" screen of the Techstream
  2. Applies to "ECM Communication Stop Mode" in "DTC Combination Table"
  1. Power source circuit of ECM
  2. ECM

WIRING DIAGRAM


Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Ecm Communication Stop Mode


Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Ecm Communication Stop Mode


INSPECTION PROCEDURE

NOTICE:
  1. Turn the ignition switch off before measuring the resistance between main CAN bus wires and CAN Bus branch wires.
  2. After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
  3. Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If any doors need to be opened in order to check the connectors, open the doors and leave them open.
HINT:
  1. Operating the ignition switch, any other switches, or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
  2. Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.
1.CHECK FOR OPEN IN CAN NO. 1 BUS MAIN WIRE (ECM MAIN WIRE)

  1. Turn the ignition switch off.



    Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Ecm Communication Stop Mode

  1. Disconnect the ECM connector.

    Text in Illustration
    *a
    		Front view of wire harness connector
    (to ECM)
    *b
    		for 2AZ-FE
    *c
    		for 2ZR-FE

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A50-41 (CANH) - A50-49 (CANL)*1
    		Ignition switch off
    		108 to 132 Ω
    A50-8 (CANH) - A50-9 (CANL)*2
    		Ignition switch off
    		108 to 132 Ω
    *1: for 2AZ-FE
    *2: for 2ZR-FE


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK WIRE HARNESS (POWER SOURCE CIRCUIT)

  1. Check the ECM power source circuit (2ZR-FE: COROLLA_ZRE142 RM0000027690AZX.html, 2AZ-FE: COROLLA_ZRE142 RM000001F7102ZX.html).

    Result:
    Result
    		Proceed to
    OK (2ZR-FE)
    		A
    OK (2AZ-FE)
    		B
    NG
    		C


B
REPLACE ECM (2AZ-FE) (COROLLA_ZRE142 RM000002WT506MX.html)

C
REPAIR OR REPLACE HARNESS OR CONNECTOR
A

REPLACE ECM (2ZR-FE) (COROLLA_ZRE142 RM000001CN0030X.html)