CAN COMMUNICATION SYSTEM > Power Steering ECU Communication Stop Mode

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DESCRIPTION


Detection Item
Symptom
Trouble Area
Power Steering ECU Communication Stop Mode
  1. "EPS" is not displayed on the "Communication Bus Check" screen of the intelligent tester.
  2. Applies to Power Steering ECU Communication Stop Mode in DTC Combination Table.
  1. Power steering ECU assembly branch line or connector
  2. Power source circuit of power steering ECU assembly
  3. Power steering ECU assembly

WIRING DIAGRAM


C234602E01


INSPECTION PROCEDURE

NOTICE:
  1. Turn the power switch off before measuring the resistances between CAN main bus lines and between CAN branch lines.
  2. Turn the power switch off before inspecting CAN bus lines for a ground short.
  3. After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
  4. Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

HINT:
  1. Operating the power 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 LINE FOR DISCONNECTION (POWER STEERING ECU ASSEMBLY BRANCH LINE)

  1. Turn the power switch off.



    C188242E34

  1. Disconnect the power steering ECU assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H25-1 (CANH) - H25-7 (CANL)
    		Power switch off
    		54 to 69 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Power Steering ECU Assembly)



NG
REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (POWER STEERING ECU ASSEMBLY)
OK


2.CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

  1. Disconnect the power steering ECU assembly connector.



    C190011E02

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A26-1 (PIG) - Body ground
    		Power switch off
    		11 to 14 V
    H25-6 (IG) - Body ground
    		Power switch on (IG)
    		11 to 14 V

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Power Steering ECU Assembly)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK


3.CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    C188275E17

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A26-2 (PGND) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Power Steering ECU Assembly)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)
OK

REPLACE POWER STEERING ECU ASSEMBLY (Click here)