CAN COMMUNICATION SYSTEM > ECM Communication Stop Mode

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DESCRIPTION


Detection Item
Symptom
Trouble Area
ECM COMMUNICATION STOP MODE
  1. "ENGINE AND ECT" is not displayed on the "Communication Bus Check" of the intelligent tester
  2. Applies to "ECM COMMUNICATION STOP MODE" in the "DTC COMBINATION TABLE"
  1. Power source or inside the ECM
  2. ECM sub bus line or connector

WIRING DIAGRAM


C112576E03


C112576E04


INSPECTION PROCEDURE

1.CHECK CAN BUS LINE FOR DISCONNECTION (ECM SUB BUS LINE)

  1. Turn the engine switch off.

  1. Disconnect the ECM connector (A6).



    C113743E01

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    A6-25 (CANH) - A6-24 (CANL)
    		Engine switch off
    		54 to 69 Ω



NG
REPAIR OR REPLACE ECM SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)
OK


2.CHECK WIRE HARNESS (+B1, +B, E)

  1. Disconnect the ECM connectors (A6) and (E7).



    C113936E01

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    E7-7 (E1) - Body ground
    		Always
    		Below 1 Ω

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Value
    A6-5 (+B1) - Body ground
    		Engine switch off
    		10 to 14 V
    A6-6 (+B) - Body ground
    		Engine switch off
    		10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM