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Home >> Lexus >> 2007 >> RX 400h AWD >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Vehicle Control (P310) - RX400H - DTC P0AA1-231 Through U0424-537 >> DTC P3110-139 IGCT Relay Malfunction >> Inspection Procedure

Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - IGCT RELAY) 
    1. Disconnect the H34 connector from the HV control ECU.
    2. Remove the IGCT relay from the R/B.
    3. Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.
      NOTE: Turning the ignition switch to the ON position with the HV control ECU connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing the inspection.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      MREL (H34-12) - Body ground Below 1V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 1: Identifying IGCT Relay
    G05278816Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  2. INSPECT IGCT RELAY 
    1. Remove the IGCT relay from the engine room R/B.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      3 - 5 10 kΩ or more
      3 - 5 Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

    NG: REPLACE IGCT RELAY 

    Fig 2: Inspecting IGCT Relay
    G05201696Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE HYBRID VEHICLE CONTROL ECU 

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