RX400h · Service Manual HYBRID SYSTEM

P0AA4-228

Diagnostic trouble codes

DESCRIPTION

Refer to the description for DTC P0AA1-224. (Click here)
DTC No.
 INF Code
 DTC Detection Condition
 Trouble Area
P0AA4
 228
 Open or +B short in SMR3 (CON3) circuit
  1. Wire harness or connector
  2. HV relay assembly
  3. HV control ECU
P0AA5
 229
 Short to GND in the SMR3 (CON3) circuit
  1. Wire harness or connector
  2. HV relay assembly
  3. HV control ECU

MONITOR DESCRIPTION

The HV control ECU monitors the proper operation of the system main relay No.3 (CON3). If the HV control ECU detects an open or short malfunction of the relay circuit, the HV control ECU illuminates the MIL and sets a DTC.

WIRING DIAGRAM

See the wiring diagram of P0AA1-224. (Click here)

INSPECTION PROCEDURE

CAUTION:
  1. 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.
  2. 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. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - HV RELAY ASSEMBLY)

CAUTION:
Be sure to wear insulated gloves.

  1. A108053E02
    Turn the ignition switch off and remove the service plug grip. (Click here)

    NOTICE:
    Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.

  1. Disconnect the H30 connector from the HV control ECU.

  1. Disconnect the relay connector from the HV relay assembly.

  1. 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:
    Tester Connection
    		 Specified Condition
    CON3 (H30-1) - Body ground
    		 Below 1 V

  1. Turn the ignition switch off.

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

    Standard Resistance (Check for open):
    Tester Connection
    		 Specified Condition
    CON3 (H30-1) - CON3 (S48-2)
    		 Below 1 Ω

    Standard Resistance (Check for short):
    Tester Connection
    		 Specified Condition
    CON3 (H30-1) or CON3 (S48-2) - Body ground
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2. INSPECT HV RELAY ASSEMBLY

CAUTION:
Be sure to wear insulated gloves.

  1. A108054E05
    Turn the ignition switch off and remove the service plug grip. (Click here)

    NOTICE:
    Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.

  1. Remove the HV relay assembly from the vehicle. (Click here)

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

    Standard Resistance:
    Tester Connection
    		 Specified Condition
    S49-1 - S45-1
    		 Below 1 Ω
    (Apply auxiliary battery voltage between terminals CON3 (S48-2) and GND (S48-4))

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

    Standard Resistance:
    Tester Connection
    		 Specified Condition
    CON3 (S48-2) - GND (S48-4)
    		 20 to 60 Ω
    at -35 to 80°C ( -22 to -176°F)



NG
REPLACE HV RELAY ASSEMBLY
OK

REPLACE HYBRID VEHICLE CONTROL ECU


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