Can Communication System Power Steering Ecu Communication Stop Mode

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN BUS WIRE FOR DISCONNECTION (POWER STEERING ECU BRANCH WIRE)

CHECK WIRE HARNESS (POWER STEERING ECU - BATTERY AND BODY GROUND)

CAN COMMUNICATION SYSTEM - Power Steering ECU Communication Stop Mode


DESCRIPTION


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

WIRING DIAGRAM


Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Power Steering Ecu Communication Stop Mode


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 FOR DISCONNECTION (POWER STEERING ECU BRANCH WIRE)

  1. Turn the ignition switch off.



    Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Power Steering Ecu Communication Stop Mode

  1. Disconnect the power steering ECU connector.

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

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E32-1 (CANH) - E32-7 (CANL)
    		Ignition switch off
    		54 to 69 Ω


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


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


    Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Power Steering Ecu Communication Stop Mode

  1. Disconnect the power steering ECU connectors.

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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A75-2 (PGND) - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A75-1 (PIG) - Body ground
    		Always
    		10 to 14 V
    E32-6 (IG) - Body ground
    		Ignition switch ON
    		10 to 14 V
    Result:
    Result
    		Proceed to
    OK (for 2AZ-FE)
    		A
    OK (for 2ZR-FE)
    		B
    NG
    		C


B
REPLACE POWER STEERING ECU (for 2ZR-FE) (COROLLA_ZRE142 RM000002XN605BX.html)

C
REPAIR OR REPLACE HARNESS OR CONNECTOR
A

REPLACE POWER STEERING ECU (for 2AZ-FE) (COROLLA_ZRE142 RM000002XN605AX.html)