Nissan Pathfinder. Manual - part 491

EC-270

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0197, P0198 EOT SENSOR

Is the inspection result normal?

YES

>> GO TO 3.

NO

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

3.

CHECK ENGINE OIL TEMPERATURE SENSOR

Check engine oil temperature sensor. Refer to 

EC-271, "Component Inspection"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-49, "Intermittent Incident"

.

NO

>> Replace engine oil temperature sensor. Refer to 

EC-14, "ENGINE CONTROL SYSTEM : Compo-

nent Parts Location"

.

Component Inspection

INFOID:0000000009178185

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. Refer to 

EC-14, "ENGINE CONTROL SYSTEM : Component

Parts Location"

.

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. Refer to 

EC-14,

"ENGINE CONTROL SYSTEM : Component Parts Location"

.

Terminals

Condition

Resistance (k

Ω)

1 and 2

Temperature [

°C (°F)]

20 (68)

2.37 - 2.63

50 (122)

0.68 - 1.00

90 (194)

0.236 - 0.260

JMBIA0080ZZ

P0222, P0223 TP SENSOR

EC-271

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

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P0222, P0223 TP SENSOR

DTC Logic

INFOID:0000000009178186

DTC DETECTION LOGIC

NOTE:

If DTC P0222 or P0223 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.

Refer to 

EC-354, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 10 V at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine and let it idle for 1 second.

2. Check DTC.
Is DTC detected?

YES

>> Proceed to 

EC-272, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009178187

1.

CHECK THROTTLE POSITION SENSOR 1 POWER SUPPLY

1. Disconnect electric throttle control actuator harness connector.

2. Turn ignition switch ON.

3. Check the voltage between electric throttle control actuator harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

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

2.

CHECK THROTTLE POSITION SENSOR 1 GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between electric throttle control actuator and ECM harness connector.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0222

TP SEN 1/CIRC-B1
(Throttle/Pedal position sen-
sor/switch “B” circuit low)

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

• Harness or connectors

(TP sensor 1 circuit is open or shorted.)

• Electric throttle control actuator

(TP sensor 1)

P0223

TP SEN 1/CIRC-B1
(Throttle/Pedal position sen-
sor/switch “B” circuit high)

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

Electric throttle control actuator

Ground

Voltage

Connector

Terminal

F50

1

Ground

Approx. 5 V

EC-272

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0222, P0223 TP SENSOR

4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 3.

NO

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

3.

CHECK THROTTLE POSITION SENSOR 1 INPUT SIGNAL CIRCUIT

1. Check the continuity between electric throttle control actuator and ECM harness connector.

2. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 4.

NO

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

4.

CHECK THROTTLE POSITION SENSOR

Check throttle position sensor. Refer to 

EC-273, "Component Inspection"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-49, "Intermittent Incident"

.

NO

>> Replace electric throttle control actuator. Refer to 

EM-26, "Removal and Installation"

.

Component Inspection

INFOID:0000000009178188

1.

CHECK THROTTLE POSITION SENSOR

1. Turn ignition switch OFF.

2. Reconnect all harness connectors disconnected.

3. Perform 

EC-142, "Work Procedure"

.

4. Turn ignition switch ON.

5. Set selector lever to D position.

6. Check the voltage between ECM harness connector terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace electric throttle control actuator. Refer to 

EM-26, "Removal and Installation"

.

Electric throttle control actuator

ECM

Continuity

Connector

Terminal

Connector

Terminal

F50

4

F51

19

Existed

Electric throttle control actuator

ECM

Continuity

Connector

Terminal

Connector

Terminal

F50

2

F51

22

Existed

ECM

Condition

Voltage

Connector

+

–

Terminal

Terminal

F51

22

19

Accelerator pedal

Fully released

More than 0.36 V

Fully depressed

Less than 4.75 V

23

Fully released

Less than 4.75 V

Fully depressed

More than 0.36 V

P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE

EC-273

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

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P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE

DTC Logic

INFOID:0000000009178189

DTC DETECTION LOGIC

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crank-

shaft position (CKP) sensor (POS) signal to vary, ECM can determine that a misfire is occurring.

The misfire detection logic consists of the following two conditions.
1. One Trip Detection Logic (Three Way Catalyst Damage) 

On the 1st trip, when a misfire condition occurs that can damage the three way catalyst (TWC) due to

overheating, the MIL will blink.

When a misfire condition occurs, the ECM monitors the CKP sensor signal every 200 engine revolutions

for a change.

When the misfire condition decreases to a level that will not damage the TWC, the MIL will turn off.

If another misfire condition occurs that can damage the TWC on a second trip, the MIL will blink.

When the misfire condition decreases to a level that will not damage the TWC, the MIL will remain on.

If another misfire condition occurs that can damage the TWC, the MIL will begin to blink again.

2. Two Trip Detection Logic (Exhaust quality deterioration)

For misfire conditions that will not damage the TWC (but will affect vehicle emissions), the MIL will only

illuminate when the misfire is detected on a second trip. During this condition, the ECM monitors the CKP

sensor signal every 1,000 engine revolutions.

A misfire malfunction can be detected in any one cylinder or in multiple cylinders.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

>> 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.

Sensor

Input signal to ECM

ECM function

Crankshaft position sensor (POS)

Engine speed

On board diagnosis of misfire

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0300

MULTI CYL MISFIRE
(Random/Multiple cylinder misfire detected)

Multiple cylinders misfire.

• Improper spark plug
• Insufficient compression
• Incorrect fuel pressure
• The fuel injector circuit is open or shorted
• Fuel injector
• Intake air leakage
• The ignition signal circuit is open or shorted
• Lack of fuel
• Signal plate
• A/F sensor 1
• Incorrect PCV hose connection

P0301

CYL 1 MISFIRE
(Cylinder 1 misfire detected)

No. 1 cylinder misfires.

P0302

CYL 2 MISFIRE
(Cylinder 2 misfire detected)

No. 2 cylinder misfires.

P0303

CYL 3 MISFIRE
(Cylinder 3 misfire detected)

No. 3 cylinder misfires.

P0304

CYL 4 MISFIRE
(Cylinder 4 misfire detected)

No. 4 cylinder misfires.

P0305

CYL 5 MISFIRE
(Cylinder 5 misfire detected)

No. 5 cylinder misfires.

P0306

CYL 6 MISFIRE
(Cylinder 6 misfire detected)

No. 6 cylinder misfires.