Lexus NX manuals

Lexus NX: Generator Temperature Sensor Circuit Low (P0A38-257,P0A39-259)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (hybrid / Battery Control) / Hybrid Control System / Generator Temperature Sensor Circuit Low (P0A38-257,P0A39-259)

DESCRIPTION

Refer to the description for DTC P0A37-260.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0A38-257

Generator Temperature Sensor Circuit Low

Short to ground in the generator temperature sensor circuit

(1 trip detection logic)
  • Wire harness or connector
  • Hybrid vehicle control ECU
  • Generator temperature sensor (Hybrid vehicle transaxle assembly)

Comes on

Master Warning Light:

Comes on

P0A39-259

Generator Temperature Sensor Circuit High

Open or short to +B in the generator temperature sensor circuit

(1 trip detection logic)
  • Wire harness or connector
  • Hybrid vehicle control ECU
  • Generator temperature sensor (Hybrid vehicle transaxle assembly)

Comes on

Master Warning Light:

Comes on
Related Data List

DTC No.

Data List

P0A38-257

Motor Temp No2

P0A39-259

HINT:

After confirming that DTC P0A38-257 or P0A39-259 is output, use the Techstream to check "Motor Temp No2" in the Data List.

Displayed Temperature

Malfunction

-40°C (-40°F)

Open circuit or short to +B

215°C (419°F)

Short circuit or short to ground

MONITOR DESCRIPTION

If the hybrid vehicle control ECU detects a malfunction of the generator temperature sensor, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P0A38 (INF 257): Generator Temperature Sensor Circuit Low

P0A39 (INF 259): Generator Temperature Sensor Circuit High

Required sensors / components

Generator temperature sensor

Frequency of operation

Continuous

Duration

TMC's intellectual property

MIL operation

1 driving cycle

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present

TMC's intellectual property

Other conditions belong to TMC's intellectual property

-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

-

COMPONENT OPERATING RANGE

Hybrid vehicle control ECU assembly

DTC P0A38 (INF 257) is not detected

DTC P0A39 (INF 259) is not detected

CONFIRMATION DRIVING PATTERN

HINT:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off and wait for 2 minutes or more.
  5. Turn the power switch on (IG) and turn the Techstream on.
  6. With power switch on (IG) and wait for 5 seconds or more.
  7. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
  8. Read the current DTCs.

    HINT:

    • If a current DTC is output, the system is malfunctioning.
    • If a current DTC is not output, perform the following procedure.
  9. Check that permanent DTCs are cleared. If no permanent DTC is output, the system is normal.
  10. If the permanent DTCs are not cleared, perform the universal trip, and then check for permanent DTCs again.

WIRING DIAGRAM

PROCEDURE

1.

CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

Click here

Result

Proceed to

OK

A

NG (The connector is not connected securely.)

B

NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)

C
B

CONNECT SECURELY
C

REPAIR OR REPLACE HARNESS OR CONNECTOR
A

2.

CHECK CONNECTOR CONNECTION CONDITION (NO. 1 ENGINE ROOM RELAY BLOCK CA1 CONNECTOR)

Click here

Result

Proceed to

OK

A

NG (The connector is not connected securely.)

B

NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)

C
B

CONNECT SECURELY
C

REPAIR OR REPLACE HARNESS OR CONNECTOR
A

3.

CHECK CONNECTOR CONNECTION CONDITION (GENERATOR TEMPERATURE SENSOR CONNECTOR)

(a) Check the connection condition of the generator temperature sensor connector and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.

Click here

OK:

- The connector is connected securely.

- The terminals are not deformed and are connected securely.

- No water or foreign matter in the connector.

Result

Proceed to

OK

A

NG (The connector is not connected securely.)

B

NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)

C
B

CONNECT SECURELY
C

REPAIR OR REPLACE HARNESS OR CONNECTOR
A

4.

READ VALUE USING TECHSTREAM (MOTOR TEMP NO2)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temp No2.

Powertrain > Hybrid Control > Data List

Tester Display

Motor Temp No2

(d) Read the Data List.

(e) Turn the power switch off.

215°C (419°F)

GO TO STEP 7

Same as actual temperature

REPAIR OR REPLACE HARNESS OR CONNECTOR
-40°C (-40°F)

5.

INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (GENERATOR TEMPERATURE SENSOR)

(a) Disconnect the C41 generator temperature sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4 (GMT) - 8 (GMTG)

Power switch off

0.3436 to 1442 kΩ

*a

Component without harness connected

(Hybrid Vehicle Transaxle Assembly (Generator Temperature Sensor))

(c) Reconnect the C41 generator temperature sensor connector.

NG

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

OK

6.

CHECK HYBRID VEHICLE CONTROL ECU

(a) Connect terminals 26 (GMT) and 27 (GMTG) of the A60 hybrid vehicle control ECU connector.

*a

Component with harness connected

(to Hybrid Vehicle Control ECU)

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG).

(d) Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temp No2.

Powertrain > Hybrid Control > Data List

Tester Display

Motor Temp No2

(e) Read the Data List.

OK:

Tester Display

Condition

Specified Condition

Motor Temp No2

Terminals A60-26 (GMT) and A60-27 (GMTG) connected

Power switch on (IG)

215°C (419°F)

(f) Turn the power switch off.

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR
NG

REPLACE HYBRID VEHICLE CONTROL ECU

7.

INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (GENERATOR TEMPERATURE SENSOR)

(a) Disconnect the C41 generator temperature sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4 (GMT) - 8 (GMTG)

Power switch off

0.3436 to 1442 kΩ

*a

Component without harness connected

(Hybrid Vehicle Transaxle Assembly (Generator Temperature Sensor))

(c) Reconnect the C41 generator temperature sensor connector.

NG

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

OK

8.

CHECK HARNESS AND CONNECTOR (GENERATOR TEMPERATURE SENSOR - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the C41 generator temperature sensor connector.

(b) Disconnect the A60 hybrid vehicle control ECU connector.

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

*a

Front view of wire harness connector

(to Generator Temperature Sensor)

*b

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

C41-4 (GMT) - A60-26 (GMT)

Power switch off

Below 1 Ω

C41-8 (GMTG) - A60-27 (GMTG)

Power switch off

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

C41-4 (GMT) or A60-26 (GMT) - Body ground and other terminals

Power switch off

10 kΩ or higher

C41-8 (GMTG) or A60-27 (GMTG) - Body ground and other terminals

Power switch off

10 kΩ or higher

(d) Reconnect the A60 hybrid vehicle control ECU connector.

(e) Reconnect the C41 generator temperature sensor connector.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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