Infiniti G35 (V35) Sedan. Manual - part 523

EC-238

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0196 EOT SENSOR

>> INSPECTION END

Component Inspection

INFOID:0000000000956626

1.

CHECK ENGINE OIL TEMPERATURE SENSOR

1.

Turn ignition switch OFF.

2.

Disconnect engine oil temperature sensor harness connector.

3.

Remove engine oil temperature sensor.

4.

Check resistance between engine oil temperature sensor termi-
nals by heating with hot water as shown in the figure.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace engine oil temperature sensor.

Terminals

Condition

Resistance

1 and 2

Temperature

°

C (

°

F)

20 (68)

2.1 - 2.9

k

Ω

50 (122)

0.68 - 1.00

k

Ω

90 (194)

0.236 - 0.260

k

Ω

JMBIA0080ZZ

P0197, P0198 EOT SENSOR

EC-239

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0197, P0198 EOT SENSOR

Description

INFOID:0000000000956627

The engine oil temperature sensor is used to detect the engine oil
temperature. The sensor modifies a voltage signal from the ECM.
The modified signal returns to the ECM as the engine oil tempera-
ture input. The sensor uses a thermistor which is sensitive to the
change in temperature. The electrical resistance of the thermistor
decreases as temperature increases.

<Reference data>

*: These data are reference values and are measured between ECM terminal 78
(Engine oil temperature sensor) and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM’s transis-
tor. Use a ground other than ECM terminals, such as the ground.

DTC Logic

INFOID:0000000000956628

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and wait at least 5 seconds.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

SEF594K

Engine oil temperature

°

C (

°

F)

Voltage*

V

Resistance

k

Ω

–10 (14)

4.4

7.0 - 11.4

20 (68)

3.5

2.1 - 2.9

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

110 (230)

0.6

0.143 - 0.153

SEF012P

DTC No.

Trouble Diagnosis 

Name

DTC Detecting Condition

Possible Cause

P0197

Engine oil tempera-
ture sensor circuit low 
input

An excessively low voltage from the sensor is 
sent to ECM.

• Harness or connectors

(The sensor circuit is open or shorted.)

• Engine oil temperature sensor

P0198

Engine oil tempera-
ture sensor circuit 
high input

An excessively high voltage from the sensor is 
sent to ECM.

EC-240

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0197, P0198 EOT SENSOR

YES

>> Go to 

EC-240, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000956629

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-42, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK EOT SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect engine oil temperature (EOT) sensor harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between EOT sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair open circuit or short to ground or short to power in harness or connectors.

3.

CHECK EOT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between EOT sensor harness connector and ECM harness connector.

4.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair open circuit or short to ground or short to power in harness or connectors.

4.

CHECK ENGINE OIL TEMPERATURE SENSOR

Refer to 

EC-240, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace engine oil temperature sensor.

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-39, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000000956630

1.

CHECK ENGINE OIL TEMPERATURE SENSOR

1.

Turn ignition switch OFF.

2.

Disconnect engine oil temperature sensor harness connector.

3.

Remove engine oil temperature sensor.

EOT sensor

Ground

Voltage

Connector

Terminal

F38

1

Ground

Approx. 5V

EOT sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

F38

2

F102

84

Existed

P0197, P0198 EOT SENSOR

EC-241

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

4.

Check resistance between engine oil temperature sensor termi-
nals by heating with hot water as shown in the figure.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace engine oil temperature sensor.

Terminals

Condition

Resistance

1 and 2

Temperature

°

C (

°

F)

20 (68)

2.1 - 2.9

k

Ω

50 (122)

0.68 - 1.00

k

Ω

90 (194)

0.236 - 0.260

k

Ω

JMBIA0080ZZ