RX400h · Service Manual HYBRID SYSTEM

P0A2C-247

Diagnostic trouble codes

DESCRIPTION

The resistance of the thermistor built into the motor temperature sensor changes in accordance with changes in Motor temperature. The lower the Motor temperature, the higher the termistor resistance. Conversely, the higher the temperature, the lower the resistance.
A037296E01
DTC No.
 INF Code
 DTC Detection Condition
 Trouble Area
P0A2C
 247
 GND short in motor temperature sensor circuit
  1. Wire harness or connector
  2. HV control ECU
  3. Hybrid vehicle transaxle assembly (Motor temperature sensor)
P0A2D
 249
 Open or +B short in motor temperature sensor circuit
  1. Wire harness or connector
  2. HV control ECU
  3. Hybrid vehicle transaxle assembly (Motor temperature sensor)

HINT:
After confirming that DTC P0A2C-247 or P0A2D-249 is output, use the intelligent tester to check "MOTOR 2 TEMP" in the HV system ECU data list.
Displayed Temperature
 Malfunction
-50°C
 Open or +B short circuit
205°C
 GND short


WIRING DIAGRAM

A113954E04

INSPECTION PROCEDURE


1. CHECK CONNECTION CONDITION OF HYBRID VEHICLE CONTROL ECU CONNECTOR (LOOSENESS AND POOR CONTACT)

  1. A103658E18
    Check the connections of all HV control ECU connectors.

    OK:
    Connectors are connected securely and there is no poor connection.



 NG
CONNECT SECURELY
OK


2. INSPECT HYBRID VEHICLE CONTROL ECU

  1. A103658E40
    Turn the ignition switch to the ON position. Measure the voltage according to the value(s) in the table below.

    Result:
    Tester Connection
    		 Voltage
    		 Proceed to
    MMT (H34-26) - MMTG (H34-33)
    		 Approximately 0 or 5 V
    		 A
    9 to 14V
    		 B



A
Go to step 5
B


3. CHECK HARNESS AND CONNECTOR (+B SHORT)

  1. A103659E03
    Disconnect the H34 connector from the HV control ECU.

  1. Turn the ignition switch to the ON position.

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

    Result::
    Tester Connection
    		 Voltage
    		 Proceed to
    MMT (H34-26) - MMTG (H34-33)
    		 Approximately 0 V
    		 A
    9 to 14V
    		 B

    NOTICE:
    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.



 A
REPLACE HYBRID VEHICLE CONTROL ECU
B


4. CHECK HARNESS AND CONNECTOR (+B SHORT)

  1. Disconnect the H34 connector from the HV control ECU.

  1. Disconnect the M8 motor temperature sensor connector.

  1. Turn the ignition switch to the ON position.

  1. A105210E05
    Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		 Specified Condition
    MMT (M8-1) or MMT (H34-26) - Body ground
    		 Approximately 0 V

    NOTICE:
    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.

    HINT:
    The motor temperature sensor is not available as a single product. If it requires replacement, replace the HV transaxle assembly.



 NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

5. INSPECT MOTOR TEMPERATURE SENSOR

  1. A103659E03
    Disconnect the H34 connector from the HV control ECU.

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

    Standard Resistance:
    Tester Connection
    		 Resistance
    		 Temperature
    MMT (H34-26) - MMTG (H34-33)
    		 142.6 k to 184.1 kΩ
    		 0°C
    44.2 k to 54.4 kΩ
    		 25°C
    16.2 k to 19.1 kΩ
    		 50°C
    3.3 k to 3.5 kΩ
    		 100°C

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

    Standard Resistance:
    Tester Connection
    		 Specified Condition
    MMT (H34-26) or MMTG (H34-33) - Body ground
    		 10 kΩ or higher



OK
REPLACE HYBRID VEHICLE CONTROL ECU
NG


6. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - MOTOR TEMPERATURE SENSOR)

  1. Disconnect the H34 connector from the HV control ECU.

  1. Disconnect the M8 motor temperature sensor connector.

  1. A105210E06
    Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		 Specified Condition
    MMT (H34-26) - MMT (M8-1)
    		 Below 1 Ω
    MMTG (H34-33) - MMTG (M8-3)
    		 Below 1 Ω

    Standard Resistance:
    Tester Connection
    		 Specified Condition
    MMT (H34-26) or MMTG (H34-33) - Body ground
    		 10 kΩ or higher

    HINT:
    The motor temperature sensor is not available as a single product. If it requires replacement, replace the HV transaxle assembly.



 NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY


← P0A2B-248P0A31-667 →