Can Communication System Check Can Bus Line

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, CAN BUS LINES FOR SHORT CIRCUIT)

CHECK FOR SHORT TO B+ IN CAN BUS WIRE

CHECK FOR SHORT TO GND IN CAN BUS WIRE

CAN COMMUNICATION SYSTEM - Check CAN Bus Line


DESCRIPTION

If CAN communication system DTCs are not output, first measure the resistance between the terminals of the DLC3 to specify the trouble area, and check that there is no short in the CAN wire, and +B or GND.

WIRING DIAGRAM


Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Check Can Bus Line


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 CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, CAN BUS LINES FOR SHORT CIRCUIT)


    Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Check Can Bus Line

  1. Turn the ignition switch off.

    Text in Illustration
    *1
    		DLC3

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Result
    		Proceed to
    E11-6 (CANH) - E11-14 (CANL)
    		Ignition switch off
    		54 to 69 Ω
    		A
    E11-6 (CANH) - E11-14 (CANL)
    		Ignition switch off
    		70 Ω or higher
    		B
    E11-6 (CANH) - E11-14 (CANL)
    		Ignition switch off
    		Below 54 Ω
    		C


B
CHECK FOR OPEN IN CAN MAIN BUS LINE (COROLLA_ZRE142 RM000001V9P06OX.html)

C
CHECK CAN BUS LINES FOR SHORT CIRCUIT (COROLLA_ZRE142 RM000001FAD065X.html)
A


2.CHECK FOR SHORT TO B+ IN CAN BUS WIRE


    Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Check Can Bus Line

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

    Text in Illustration
    *1
    		DLC3
    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E11-6 (CANH) - E11-16 (BAT)
    		Cable is disconnected from negative (-) battery terminal
    		6 kΩ or higher
    E11-14 (CANL) - E11-16 (BAT)
    		Cable is disconnected from negative (-) battery terminal
    		6 kΩ or higher


NG
CHECK CAN BUS LINE FOR SHORT TO +B (COROLLA_ZRE142 RM000001FAE05EX.html)
OK


3.CHECK FOR SHORT TO GND IN CAN BUS WIRE


    Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Check Can Bus Line

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

    Text in Illustration
    *1
    		DLC3
    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E11-6 (CANH) - E11-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    E11-14 (CANL) - E11-4 (CG)
    		Ignition switch off
    		200 Ω or higher


NG
CHECK CAN BUS LINE FOR SHORT TO GND (COROLLA_ZRE142 RM000001FAF05EX.html)
OK

GO TO HOW TO PROCEED WITH TROUBLESHOOTING (COROLLA_ZRE142 RM000000WI60ACX.html)