RX400h · Service Manual HYBRID SYSTEM

P0A38-257

Diagnostic trouble codes

DESCRIPTION

Refer to the circuit description for DTC P0A2C-247. (Click here)
DTC No.
 INF Code
 DTC Detection Condition
 Trouble Area
P0A38
 257
 GND short in generator temperature sensor circuit
  1. Wire harness or connector
  2. HV control ECU
  3. Hybrid vehicle transaxle assembly (Generator temperature sensor)
P0A39
 259
 Open or +B short in generator temperature sensor circuit
  1. Wire harness or connector
  2. HV control ECU
  3. Hybrid vehicle transaxle assembly (Generator temperature sensor)

HINT:
After confirming that DTC P0A38-257 or P0A39-259 is output, use the intelligent tester to check "MOTOR 1 TEMP" in the HV system ECU data list.

Displayed Temperature
 Malfunction
-50°C
 Open or +B short circuit
205°C
 GND short

WIRING DIAGRAM

A113954E05

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. A103658E41
    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
    GMT (H34-22) - GMTG (H34-32)
    		 Approximately 0 V
    		 A
    9 to 14V
    		 B



A
Go to step 5
B


3. CHECK HARNESS AND CONNECTOR (+B SHORT)

  1. A103659E04
    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
    GMT (H34-22) - GMTG (H34-32)
    		 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. Remove the w/ converter inverter. (Click here)

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

  1. A105167
    Disconnect the M6 generator temperature sensor connector.

  1. Turn the ignition switch to the ON position.

  1. A113787E04
    Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		 Specified Condition
    GMT (M6-4) - 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 generator 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 GENERATOR TEMPERATURE SENSOR

  1. A103659E04
    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
    GMT (H34-22) - GMTG (H34-32)
    		 142.6 to 184.1 kΩ
    		 0°C
    44.2 to 54.4 kΩ
    		 25°C
    16.2 to 19.1 kΩ
    		 50°C
    3.1 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
    GMT (H34-22) or MMTG (H34-32) - Body ground
    		 10 kΩ or higher



NG
REPLACE HYBRID VEHICLE CONTROL ECU
NG


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

  1. Remove the w/ converter inverter. (Click here)

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

  1. Disconnect the M6 generator temperature sensor connector.

  1. A113787E05
    Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		 Specified Condition
    GMT (H34-22) - GMT (M6-4)
    		 Below 1 Ω
    GMTG (H34-32) - GMTG (M6-9)
    		 Below 1 Ω

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

    Standard Resistance:
    Tester Connection
    		 Specified Condition
    GMT (H34-22) or GMTG (H34-32) - Body ground
    		 10 kΩ or higher

    HINT:
    The generator 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


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