Nissan Altima HL32 Hybrid. Manual - part 614

P0A38-257, P0A39-259

HBC-205

< COMPONENT DIAGNOSIS >

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P0A38-257, P0A39-259

Description

INFOID:0000000004211882

The resistance of the thermistor built into the motor temperature sensor changes in accordance with changes

in MG2 temperature. The lower the MG2 temperature, the more the thermistor resistance. Conversely, the

more the temperature, the lower the resistance.

DTC Logic

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DTC DETECTION LOGIC

Diagnosis Procedure

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1.

PRECONDITIONING

• Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with

converter assembly, take safety precautions such as wearing insulated gloves and removing the service

plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent

other technicians from accidentally reconnecting it while you are working on the high-voltage system.

• After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage

connectors or terminals.

• Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with

converter assembly.

>> GO TO 2.

2.

CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

See 

HBC-109, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 3.

NG

>> Connect securely.

3.

CHECK CONNECTOR CONNECTION CONDITION (GENERATOR TEMPERATURE SENSOR CONNEC-

TOR)

Check the connections of the generator temperature sensor connector.

JMCIA0097GB

DTC No.

INF Code

Trouble diagnosis name

DTC detecting condition

Possible cause

P0A38

257

Generator Temperature 
Sensor Circuit Low

GND short in generator temperature 
sensor circuit

• Wire harness or connector
• Hybrid vehicle control ECU
• Hybrid transaxle (Generator tempera-

ture sensor)

P0A39

259

Generator Temperature 
Sensor Circuit High

Open or +B short in generator tem-
perature sensor circuit

• Wire harness or connector
• Hybrid vehicle control ECU
• Hybrid transaxle (Generator tempera-

ture sensor)

HBC-206

< COMPONENT DIAGNOSIS >

P0A38-257, P0A39-259

OK or NG

OK

>> GO TO 4.

NG

>> Connect securely.

4.

READ VALUE OF DATA MONITOR (MG2 MOTOR TEMP)

1. Turn ignition switch ON.

2. Select “MG2 MOTOR TEMP” in DATA MONITOR mode with CONSULT-III.

3. Read the indication.

A or B or C

A

>> GO  TO  5.

B

>> GO  TO  7.

C

>> Check for intermittent incident (See 

GI-42, "Intermittent Incident"

).

5.

READ VALUE OF DATA MONITOR (MG2 MOTOR TEMP)

1. Disconnect the generator temperature sensor harness connector F78.

2. Connect terminals 4 and 9 of the generator temperature sensor vehicle side connector.

3. Turn ignition switch ON.

4. Select “MG2 MOTOR TEMP” in DATA MONITOR mode with CONSULT-III.

5. Read the indication.

OK or NG

OK

>> Replace hybrid transaxle (See 

TM-36, "Removal and Installation"

).

NG

>> GO TO 6.

6.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - GENERATOR TEMPERA-

TURE SENSOR)
1. Disconnect the hybrid vehicle control ECU harness connector E65.

2. Turn ignition switch ON.

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

NOTE:

Turn ignition switch ON with the hybrid vehicle control ECU connectors disconnected causes other DTCs

to be stored. Clear the DTCs after performing this inspection.

4. Turn ignition switch OFF.

5. Disconnect the generator temperature sensor harness connector F78.

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

• The connectors are connected securely and there are no contact problems.
• Dirt or foreign objects have not entered the connection, or there is no evidence 

of contamination. 

A

B

C

50

°C (-58°F)

205

°C (401°F) or more

Same as actual temperature

Displayed temperature

: 205

°C (401°F) or more

Hybrid vehicle control ECU

Ground

Voltage

Harness

connector

Terminal

E65

14 (GMT)

Ground

Below 1 V

13 (GMTG)

P0A38-257, P0A39-259

HBC-207

< COMPONENT DIAGNOSIS >

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Check for open

Check for short

OK or NG

OK

>> Replace hybrid vehicle control ECU (See 

HBC-644, "Removal and Installation"

).

NG

>> Repair or replace harness or connector.

7.

READ VALUE OF DATA MONITOR (MG2 MOTOR TEMP)

1. Disconnect the generator temperature sensor harness connector F78.

2. Turn ignition switch ON.

3. Select “MG2 MOTOR TEMP” in DATA MONITOR mode with CONSULT-III.

4. Read the indication.

OK or NG

OK

>> Replace hybrid transaxle (See 

TM-36, "Removal and Installation"

).

NG

>> GO TO 8.

8.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - GENERATOR TEMPERA-

TURE SENSOR)

1. Disconnect the hybrid vehicle control ECU harness connector E65.

2. Disconnect the generator temperature sensor harness connector F78.

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

Check for open

Check for short

Hybrid vehicle control ECU

Generator temperature sensor

Resistance

Harness

connector

Terminal

Harness

connector

Terminal

E65

14 (GMT)

F78

4 (GMT)

Below 1 

Ω

13 (GMTG)

9 (GMTG)

Hybrid vehicle control ECU

Ground

Resistance

Harness

connector

Terminal

E65

14 (GMT)

Ground

10 k

Ω or higher

13 (GMTG)

Generator temperature sensor

Ground

Resistance

Harness

connector

Terminal

F78

4 (GMT)

Ground

10 k

Ω or higher

9 (GMTG)

Displayed temperature

: -50

°C (-58°F)

Hybrid vehicle control ECU

Generator temperature sensor

Resistance

Harness

connector

Terminal

Harness

connector

Terminal

E65

14 (GMT)

F78

4 (GMT)

Below 1 

Ω

13 (GMTG)

9 (GMTG)

Hybrid vehicle control ECU

Ground

Resistance

Harness

connector

Terminal

E65

14 (GMT)

Ground

10 k

Ω or higher

13 (GMTG)

HBC-208

< COMPONENT DIAGNOSIS >

P0A38-257, P0A39-259

OK or NG

OK

>> Replace hybrid vehicle control ECU (See 

HBC-644, "Removal and Installation"

).

NG

>> Repair or replace harness or connector.

Generator temperature sensor

Ground

Resistance

Harness

connector

Terminal

F78

4 (GMT)

Ground

10 k

Ω or higher

9 (GMTG)