Infiniti EX35. Manual - part 623

EC-234

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0196 EOT SENSOR

P0196 EOT SENSOR

Description

INFOID:0000000003133392

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 terminals 78
(Engine oil temperature sensor) and 84 (Sensor ground).

DTC Logic

INFOID:0000000003133393

DTC DETECTION LOGIC

NOTE:
If DTC P0196 is displayed with P0197 or P0198, first perform the trouble diagnosis for DTC P0197,
P0198. Refer to 

EC-237, "DTC 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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE-I

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Start engine and let it idle for 5 minutes and 10 seconds.

4.

Check 1st trip DTC.

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

P0196

Engine oil temperature 
sensor range/perfor-
mance

Rationally incorrect voltage from the sensor is 
sent to ECM, compared with the voltage signals 
from engine coolant temperature sensor and in-
take air temperature sensor.

• Harness or connectors

(The sensor circuit is open or shorted)

• Engine oil temperature sensor

P0196 EOT SENSOR

EC-235

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Is 1st trip DTC detected?

YES

>>

EC-235, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE-II

With CONSULT-III

1.

Select “DATA MONITOR” mode with CONSULT-III.

2.

Check that “COOLAN TEMP/S” indicates above 80

°

C (176

°

F).

If it is above 80

°

C (176

°

F), go to the following steps.

If it is below 80

°

C (176

°

F), warm engine up until “COOLAN TEMP/S” indicates more than 80

°

C (176

°

F).

Then go to the following steps.

3.

Turn ignition switch OFF and soak the vehicle at cool place.

4.

Turn ignition switch ON.
NOTE:
Do not turn ignition switch OFF until step 8.

5.

Select “DATA MONITOR” mode with CONSULT-III.

6.

Check the following.

If they are within the specified range, go to the following steps.
If they are out of the specified range, soak the vehicle to meet the above conditions. Then go to the follow-
ing steps.
NOTE:
• Do not turn ignition switch OFF.
• If it is supposed to need a long period of time, do not deplete the battery.

7.

Start engine and let it idle for 5 minutes.

8.

Check 1st trip DTC.

With GST

Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?

YES

>>

EC-235, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003133394

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-41, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK ENGINE OIL TEMPERATURE SENSOR

Refer to 

EC-236, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace engine oil temperature sensor.

3.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

.

>> INSPECTION END

COOLAN TEMP/S

Below 40

°

C (104

°

F)

INT/A TEMP SE

Below 40

°

C (104

°

F)

Difference between “COOLAN TEMP/S” and “INT/A TEMP SE”

Within 6

°

C (11

°

F)

EC-236

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0196 EOT SENSOR

Component Inspection

INFOID:0000000003133395

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 (k

Ω

)

1 and 2

Temperature

[

°

C (

°

F)]

20 (68)

2.1 - 2.9

50 (122)

0.68 - 1.00

90 (194)

0.236 - 0.260

JMBIA0080ZZ

P0197, P0198 EOT SENSOR

EC-237

< 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:0000000003133396

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 terminals 78
(Engine oil temperature sensor) and 84 (Sensor ground).

DTC Logic

INFOID:0000000003133397

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?

YES

>> Go to 

EC-238, "Diagnosis Procedure"

.

NO

>> INSPECTION END

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.