RX400h · Service Manual COMMUNICATION SYSTEM

Power Steering ECU Communication Stop Mode

Circuit diagnosis

DESCRIPTION

Detection Item
 Symptom
 Suspected Area
POWER STEERING ECU COMMUNICATION STOP MODE
  1. "Power steering is not displayed on the "Communication Bus Check" screen of the intelligent tester
  2. Applies to "POWER STEERING ECU COMMUNICATION STOP MODE" in the "DTC COMBINATION TABLE"
  1. Power source circuit of the power steering ECU
  2. Power steering ECU sub bus line or connector
  3. Power steering ECU

WIRING DIAGRAM

C115359E02

INSPECTION PROCEDURE


1. CHECK CAN BUS LINE FOR DISCONNECTION (POWER STEERING ECU SUB BUS LINE)

  1. Turn the ignition switch off.

  1. G032615E04
    Disconnect the power steering ECU connector (P43).

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

    Standard Resistance:
    Tester Connection
    		 Condition
    		 Specified Value
    P43-2 (CANH) - P43-3 (CANL)
    		 Disconnect the negative auxiliary battery cable
    		 54 to 69 Ω



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


2. CHECK WIRE HARNESS (IG, PGND)

  1. G032615E03
    Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		 Condition
    		 Specified Value
    P43-5 (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 Value
    P43-9 (IG) - Body ground
    		 Ignition switch on
    		 10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER STEERING ECU


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