Nissan Pathfinder (2008 year). Manual — part 274

P1217 ENGINE OVER TEMPERATURE

EC-309

< COMPONENT DIAGNOSIS >

[VQ40DE]

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5.

If the results are NG, go to

EC-309, "Diagnosis Procedure"

.

WITH GST

1.

Check the coolant level in the reservoir tank and radiator.
Allow engine to cool before checking coolant level.
If the coolant level in the reservoir tank and/or radiator is below
the proper range, skip the following steps and go to

EC-309,

"Diagnosis Procedure"

.

2.

Confirm whether customer filled the coolant or not. If customer
filled the coolant, skip the following steps and go to

EC-309,

"Diagnosis Procedure"

.

3.

Perform IPDM E/R auto active test and check cooling fan motor
operation, refer to

PCS-10, "Diagnosis Description"

.

4.

If NG, go to

EC-309, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001376343

1.

CHECK COOLING FAN (CRANKSHAFT DRIVEN) OPERATION

1.

Start engine and let it idle.

2.

Make sure that cooling fan (crankshaft driven) operates normally.

OK or NG

OK (With CONSULT-III)>>GO TO 2.
OK (Without CONSULT-III)>>GO TO 3.
NG

>> Check cooling fan (crankshaft driven). Refer to

CO-19, "Removal and Installation (Crankshaft

driven type)"

2.

CHECK COOLING FAN OPERATION

With CONSULT-III

1.

Start engine and let it idle.

2.

Select “COOLING FAN” in “ACTIVE TEST” mode with CONSULT-III.

3.

Make sure that cooling fan operates at each speed (LOW/HI).

OK or NG

OK

>> GO TO 4.

NG

>> Check cooling fan control circuit. (Go to "PROCEDURE A".)

3.

CHECK COOLING FAN OPERATION

Without CONSULT-III

1.

Perform IPDM E/R auto active test and check cooling fan motors operation, refer to

PCS-10, "Diagnosis

Description"

.

2.

Make sure that cooling fan operates at each speed (Low/High).

OK or NG

OK

>> GO TO 4.

NG

>> Check cooling fan control circuit. (Go to "PROCEDURE A".)

4.

CHECK COOLING SYSTEM FOR LEAK

Refer to

CO-11, "System Inspection"

.

OK or NG

OK

>> GO TO 5.

NG

>>

Check the following for leak. Refer to

CO-11, "System Inspection"

.

• Hose
• Radiator
• Radiator cap
• Reservoir tank
• Water pump

5.

CHECK RESERVOIR TANK CAP

Refer to

CO-11, "System Inspection"

.

SEF621W

EC-310

< COMPONENT DIAGNOSIS >

[VQ40DE]

P1217 ENGINE OVER TEMPERATURE

OK or NG

OK

>> GO TO 6.

NG

>> Replace reservoir tank cap.

6.

CHECK COMPONENT PARTS

Check the following
• Thermostat. Refer to

CO-26, "Removal and Installation"

.

• Engine coolant temperature sensor. Refer to

EC-128, "Component Inspection"

.

OK or NG

OK

>> GO TO 7.

NG

>> Replace malfunctioning component.

7.

CHECK MAIN 12 CAUSES

If the cause cannot be isolated, go to

EC-310, "Main 12 Causes of Overheating"

.

>> INSPECTION END

Main 12 Causes of Overheating

INFOID:0000000001376344

*1: Turn the ignition switch ON.

*2: Engine running at 3,000 rpm for 10 minutes.

Engine

Step

Inspection item

Equipment

Standard

Reference page

OFF

1

• Blocked radiator
• Blocked condenser
• Blocked radiator grille
• Blocked bumper

• Visual

No blocking

—

2

• Coolant mixture

• Coolant tester

50 - 50% coolant mixture

MA-11

3

• Coolant level

• Visual

Coolant up to MAX level in
reservoir tank and radiator
filler neck

CO-12, "Changing Engine
Coolant"

4

• Reservoir tank cap

• Pressure tester

59 - 98 kPa

(0.6 - 1.0 kg/cm

2

, 9 - 14

psi) (Limit)

CO-11, "System Inspec-
tion"

ON*

2

5

• Coolant leaks

• Visual

No leaks

CO-11, "System Inspec-
tion"

ON*

2

6

• Thermostat

• Touch the upper and

lower radiator hoses

Both hoses should be hot

CO-26, "Removal and In-
stallation"

ON*

1

7

• Cooling fan

• CONSULT-III

Operating

See trouble diagnosis for
DTC P1217 (

EC-388, "Di-

agnosis Procedure"

).

ON*

2

7

• Cooling fan (Crankshaft

driven)

• Visual

Operating

See

CO-19, "Removal

and Installation (Crank-
shaft driven type)"

.

OFF

8

• Combustion gas leak

• Color checker chemical

tester 4 Gas analyzer

Negative

—

ON*

3

9

• Coolant temperature

gauge

• Visual

Gauge less than 3/4 when
driving

—

• Coolant overflow to res-

ervoir tank

• Visual

No overflow during driving
and idling

CO-12, "Changing Engine
Coolant"

OFF*

4

10

• Coolant return from res-

ervoir tank to radiator

• Visual

Should be initial level in
reservoir tank

CO-12, "Changing Engine
Coolant"

OFF

11

• Cylinder head

• Straight gauge feeler

gauge

0.1 mm (0.004 in) Maxi-
mum distortion (warping)

EM-98, "Inspection After
Disassembly"

12

• Cylinder block and pis-

tons

• Visual

No scuffing on cylinder
walls or piston

EM-117, "Inspection After
Disassembly"

P1217 ENGINE OVER TEMPERATURE

EC-311

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*3: Drive at 90 km/h (55 MPH) for 30 minutes and then let idle for 10 minutes.

*4: After 60 minutes of cool down time.

For more information, refer to

CO-9, "Troubleshooting Chart"

.

EC-312

< COMPONENT DIAGNOSIS >

[VQ40DE]

P1225 TP SENSOR

P1225 TP SENSOR

Component Description

INFOID:0000000001376346

Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has the two sensors. These sensors are
a kind of potentiometers which transform the throttle valve position
into output voltage, and emit the voltage signal to the ECM. In addi-
tion, these sensors detect the opening and closing speed of the
throttle valve and feed the voltage signals to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and the ECM controls the throttle control motor to make the
throttle valve opening angle properly in response to driving condi-
tion.

On Board Diagnosis Logic

INFOID:0000000001376347

The MIL will not light up for this diagnosis.

DTC Confirmation Procedure

INFOID:0000000001376348

NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
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 10V at idle.

1.

Turn ignition switch ON.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Turn ignition switch ON.

4.

Check 1st trip DTC.

5.

If 1st trip DTC is detected, go to

EC-312, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001376349

1.

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY

1.

Turn ignition switch OFF.

2.

Remove the intake air duct.

3.

Check if foreign matter is caught between the throttle valve and
the housing.

OK or NG

OK

>> GO TO 2.

NG

>> Remove the foreign matter and clean the electric throttle

control actuator inside.

2.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

PBIB0145E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1225
1225

Closed throttle position
learning performance

Closed throttle position learning value is exces-
sively low.

• Electric throttle control actuator

(TP sensor 1 and 2)

BBIA0554E

P1225 TP SENSOR

EC-313

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1.

Replace the electric throttle control actuator.

2.

Perform

EC-497, "Throttle Valve Closed Position Learning"

.

3.

Perform

EC-497, "Idle Air Volume Learning"

.

>> INSPECTION END

EC-314

< COMPONENT DIAGNOSIS >

[VQ40DE]

P1226 TP SENSOR

P1226 TP SENSOR

Component Description

INFOID:0000000001376350

Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has the two sensors. These sensors are
a kind of potentiometers which transform the throttle valve position
into output voltage, and emit the voltage signal to the ECM. In addi-
tion, these sensors detect the opening and closing speed of the
throttle valve and feed the voltage signals to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and the ECM controls the throttle control motor to make the
throttle valve opening angle properly in response to driving condi-
tion.

On Board Diagnosis Logic

INFOID:0000000001376351

The MIL will not light up for this diagnosis.

DTC Confirmation Procedure

INFOID:0000000001376352

NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
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 10V at idle.

1.

Turn ignition switch ON.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Turn ignition switch ON.

4.

Repeat steps 2 and 3 for 32 times.

5.

Check 1st trip DTC.

6.

If 1st trip DTC is detected, go to

EC-314, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001376353

1.

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY

1.

Turn ignition switch OFF.

2.

Remove the intake air duct.

3.

Check if foreign matter is caught between the throttle valve and
the housing.

OK or NG

OK

>> GO TO 2.

NG

>> Remove the foreign matter and clean the electric throttle

control actuator inside.

PBIB0145E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1226
1226

Closed throttle position
learning performance

Closed throttle position learning is not per-
formed successfully, repeatedly.

• Electric throttle control actuator

(TP sensor 1 and 2)

BBIA0554E

P1226 TP SENSOR

EC-315

< COMPONENT DIAGNOSIS >

[VQ40DE]

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2.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace the electric throttle control actuator.

2.

Perform

EC-497, "Throttle Valve Closed Position Learning"

.

3.

Perform

EC-497, "Idle Air Volume Learning"

.

>> INSPECTION END

EC-316

< COMPONENT DIAGNOSIS >

[VQ40DE]

P1421 COLD START CONTROL

P1421 COLD START CONTROL

Description

INFOID:0000000001376354

ECM controls ignition timing and engine idle speed when engine is started with prewarming up condition.
This control promotes the activation of three way catalyst by heating the catalyst and reduces emissions.

On Board Diagnosis Logic

INFOID:0000000001376355

NOTE:
If DTC P1421 is displayed with other DTC, first perform the trouble diagnosis for other DTC.

DTC Confirmation Procedure

INFOID:0000000001376356

NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
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 11V at idle.

WITH CONSULT-III

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Select “DATA MONITOR” mode with CONSULT-III.

4.

Check that the “COOLAN TEMP/S” indication is between 4

°

C (39

°

F) and 36

°

C (97

°

F).

If “COOLAN TEMP/S” indication is within the specified value, go to the following step.
If “COOLANT TEMP/S” indication is out of the specified value, cool engine down or warm engine up and
go to step 1.

5.

Start engine and let it idle for 5 minutes.

6.

Check 1st trip DTC.

7.

If 1st trip DTC is detected, go to "DTC Confirmation Procedure".

WITH GST

Follow the procedure “WITH CONSULT-III” above.

Diagnosis Procedure

INFOID:0000000001376357

1.

PERFORM IDLE AIR VOLUME LEARNING

Perform

EC-26, "Idle Air Volume Learning"

.

Is Idle Air Volume Learning carried out successfully?

Yes or No

Yes

>> GO TO 2.

No

>> Follow the instruction of Idle Air Volume Learning.

2.

CHECK INTAKE SYSTEM

Check for the cause of intake air volume lacking. Refer to the following.
• Crushed intake air passage
• Intake air passage clogging
OK or NG

OK

>> GO TO 3.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1421
1421

Cold start emission reduction
strategy monitoring

ECM does not control ignition timing and engine
idle speed properly when engine is started with
prewarming up condition.

• Lack of intake air volume
• Fuel injection system
• ECM