RX400h · Service Manual COMMUNICATION SYSTEM

Hybrid Vehicle Control ECU Communication Stop Mode

Circuit diagnosis

DESCRIPTION

Detection Item
 Symptom
 Suspected Area
HYBRID VEHICLE CONTROL ECU COMMUNICATION STOP MODE
  1. "HV Control" is not displayed on the "Communication Bus Check" screen of the intelligent tester
  2. Applies to "HV CONTROL ECU COMMUNICATION STOP MODE" in the "DTC COMBINATION TABLE"
  1. Power source circuit of the HV control ECU
  2. HV control ECU

WIRING DIAGRAM

C113214E05

INSPECTION PROCEDURE


1. CHECK WIRE HARNESS (+B1, +B2, IGSW, MREL, E1)

  1. A103658E13
    Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		 Condition
    		 Specified Value
    H32-5 (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
    H29-9 (IGSW) - Body ground
    		 Ignition switch on
    		 10 to 14 V
    H31-1 (+B2) - Body ground
    		Always
    		 10 to 14 V
    H31-2 (+B1) - Body ground
    		 Always
    		 10 to 14 V
    H31-12 (MREL)- Body ground
    		 Ignition switch on
    		 10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE HV CONTROL ECU


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