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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 P0A94-547 DC / DC Converter Performance; DTC P0A94-548 DC / DC Converter Performance >> 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 inside the w/ converter inverter assembly.

  1. READ OUTPUT DTC (HV) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position.
    3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DTC INFO / CURRENT CODES.
    4. Read output DTCs. (See DTC CHECK / CLEAR )

      Result: 

      The DTCs shown in the table below are output 

      OUTPUT DTC (HV)

      DTC No. INF Code Detection Item
      P0A78 266, 280 Motor inverter function malfunction
      P0A94 558, 559, 588, 589 Boost converter circuit malfunction
      P0A95 123 High voltage fuse blown out
      P0AA1 226 SMR+ stuck closed
      P0AA2 227 SMR+ stuck open
      P0AA4 228 SMR- stuck closed
      P0AA5 229 SMR- stuck open
      P3004 803 High-current wiring malfunction

      HINT:

      • Turning the ignition switch to the ON position with the service plug grip and inverter cover removed causes interlock switch system DTC P0AD-350 output.
      • P0A94-547 and P0A94-548 may be output due to a malfunction which causes the DTCs in the table above to be output. In this case, first troubleshoot the output DTCs in the table above. Then, perform a reproduction test to check that no DTCs are output.

    YES: GO TO  DIAGNOSTIC TROUBLE CODE CHART 

    NO: GO TO NEXT STEP 

  2. CHECK CONNECTION CONDITION OF MG ECU CONNECTOR (LOOSENESS AND POOR CONTACT) 
    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 inverter cover. (See INVERTER WITH CONVERTER )
      NOTE:
      • Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
      • Prevent water in the reservoir tank from entering the inverter.
      • Removing the inverter cover causes the MG ECU board to be exposed. Therefore, temporarily install the inverter cover for each area to be inspected.
    3. Check the connections of all MG ECU connectors.

      OK: 

      Connectors are connected securely and there is no poor connection. 

    Fig 1: Checking Connection Condition Of MG ECU Connector (Looseness And Poor Contact)
    G04112169Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: CONNECT SECURELY 

    OK: GO TO NEXT STEP 

  3. INSPECT HV RELAY ASSEMBLY (SMR2) 
    CAUTION: Be sure to wear insulated gloves.
    1. Check that the service plug grip is removed.
    2. Remove the HV relay assembly from the vehicle.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      HV RELAY ASSEMBLY (SMR2) (1 OF 2)

      Tester Connection Specified Condition
      S47-1 - S44-1 Below 1 Ω (Apply auxiliary battery voltage between terminals CON2 (S48-1) and GND (S48-4))
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      HV RELAY ASSEMBLY (SMR2) (2 OF 2)

      Tester Connection Specified Condition
      CON2 (S48-1) - GND (S48-4) 20 to 60 Ω at -35 to 80°C (-31 to 176°F)
      Fig 2: Inspecting HV Relay Assembly (SMR2)
      G04112170Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HV RELAY ASSEMBLY 

    OK: GO TO NEXT STEP 

  4. INSPECT HV RELAY ASSEMBLY (SMR3) 
    CAUTION: Be sure to wear insulated gloves.
    1. Check that the service plug grip is removed.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      HV RELAY ASSEMBLY (SMR3) (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))
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      HV RELAY ASSEMBLY (SMR3) (2 OF 2)

      Tester Connection Specified Condition
      CON3 (S48-2) - GND (S48-4) 20 to 60 Ω at -35 to 80°C (-31 to 176°F)
      Fig 3: Inspecting HV Relay Assembly (SMR3)
      G04112171Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HV RELAY ASSEMBLY 

    OK: REPLACE W/ CONVERTER INVERTER ASSEMBLY 

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