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" not displayed on "Communication Bus Check" of intelligent tester
  2. Applies to "Power Steering ECU Communication Stop Mode" in "DTC combination table"
  1. Power source circuit of power steering ECU
  2. Power steering ECU branch wire or connector
  3. Steering Column Assembly (Power steering ECU)

WIRING DIAGRAM


E196985E01


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 (POWER STEERING ECU BRANCH WIRE)


    E175978E01

  1. Turn the ignition switch off.

  1. Disconnect the D51 steering column assembly (power steering ECU) connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D51-2 (CANH) - D51-1 (CANL)
    		Ignition switch off
    		54 to 69 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Steering Column Assembly (Power Steering ECU))

  1. Reconnect the steering column assembly (power steering ECU) connector.



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


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


    E175979E01

  1. Disconnect the D51 and A15 steering column assembly (power steering ECU) connectors.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A15-2 (PGND) - 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
    D51-5 (IG) - Body ground
    		Ignition switch ON
    		11 to 14 V
    A15-1 (PIG) - Body ground
    		Always
    		11 to 14 V

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Steering Column Assembly (Power Steering ECU))

  1. Reconnect the steering column assembly (power steering ECU) connectors.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE STEERING COLUMN ASSEMBLY (Click here)