CAN COMMUNICATION SYSTEM > Certification ECU Communication Stop Mode

for Preparation Click here


DESCRIPTION


Detection Item
Symptom
Trouble Area
Certification ECU Communication Stop Mode
  1. "Entry & Start" not displayed on "Communication Bus Check" screen of intelligent tester
  2. Applies to "Certification ECU Communication Stop Mode" in "DTC combination table"
  1. Power source circuit of certification ECU
  2. Certification ECU branch wire or connector
  3. Certification ECU

HINT:
For vehicle with entry and start system only.


WIRING DIAGRAM


E175993E02


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses for circuit related to this system before performing the following inspection procedure.
  2. Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.
  3. After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
  4. 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 doors need to be opened in order to check connectors, open the doors and leave them open.

HINT:
Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

1.CHECK FOR OPEN IN CAN BUS WIRE (CERTIFICATION ECU BRANCH WIRE)


    E175994E01

  1. Turn the ignition switch off.

  1. Disconnect the D34 certification ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D34-9 (CANH) - D34-10 (CANL)
    		Ignition switch off
    		54 to 69 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Certification ECU)

  1. Reconnect the certification ECU connector.



NG
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L)
OK


2.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - BATTERY AND BODY GROUND)


    E175994E02

  1. Disconnect the D34 certification ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D34-15 (E) - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D34-16 (IG) - Body ground
    		Ignition switch ON
    		11 to 14 V

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Certification ECU)

  1. Reconnect the certification ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE CERTIFICATION ECU