LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2006 >> RX 400h AWD >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Vehicle Control (P310) - RX400H - DTC P0A7A-309 Through P0AA7-727 >> DTC P0AA4-228 Hybrid Battery Negative Contactor Circuit Stuck Closed; DTC P0AA5-229 Hybrid Battery Negative Contactor Circuit Stuck Open >> Inspection Procedure

Inspection Procedure

CAUTION:
  • Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from reconnecting it while you are working on the high-voltage system.
  • After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.

HINT:

At least 5 minutes is required to discharge the high-voltage capacitor insid e the w/ converter inverter assembly.

  1. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - HV RELAY ASSEMBLY) 
    CAUTION: Be sure to wear insulated gloves.
    1. Turn the ignition switch off and remove the service plug grip. (See PRECAUTION )
      NOTE: Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.
    2. Disconnect the H30 connector from the HV control ECU.
    3. Disconnect the relay connector from the HV relay assembly.
    4. Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.

      HINT:

      If the ignition switch is turned to the ON position with the service plug grip removed, the DTC (P0A0D-350) for the interlock switch system will be output.

      Standard Voltage 

      HV CONTROL ECU - HV RELAY ASSEMBLY (VOLTAGE)

      Tester Connection Specified Condition
      CON3 (H30-1) - Body ground Below 1 V
    5. Turn the ignition switch off.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for open) 

      HV CONTROL ECU - HV RELAY ASSEMBLY (CHECK FOR OPEN)

      Tester Connection Specified Condition
      CON3 (H30-1) - CON3 (S48-2) Below 1 Ω

      Standard Resistance (Check for short) 

      HV CONTROL ECU - HV RELAY ASSEMBLY (CHECK FOR SHORT)

      Tester Connection Specified Condition
      CON3 (H30-1) or CON3 (S48-2) - Body ground 10 kΩ or higher
      Fig 1: Checking Harness And Connector (HV Control ECU - HV Relay Assembly)
      G04112246Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  2. INSPECT HV RELAY ASSEMBLY 
    CAUTION: Be sure to wear insulated gloves.
    1. Turn the ignition switch off and remove the service plug grip. (See PRECAUTION )
      NOTE: Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.
    2. Remove the HV relay assembly from the vehicle. (See HV RELAY ASSEMBLY )
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      HV RELAY ASSEMBLY (1 OF 2)

      Tester Connection Specified Condition
      S49-1 - S45-1 Below 1 Ω (Apply auxiliary battery voltage between terminals CON3 (S48-2) and GND (S48-4))
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      HV RELAY ASSEMBLY (2 OF 2)

      Tester Connection Specified Condition
      CON2 (S48-2) - GND (S48-4) 20 to 60 Ω at -35 to 80°C (-31 to -176°F)
      Fig 2: Inspecting HV Relay Assembly
      G04112247Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HV RELAY ASSEMBLY 

    OK: REPLACE HYBRID VEHICLE CONTROL ECU 

scientia non olet · About LEMON Manuals