Nissan Frontier. Instruction — part 449

P1217 ENGINE OVER TEMPERATURE

EC-367

< DTC/CIRCUIT DIAGNOSIS >

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Main 12 Causes of Overheating

INFOID:0000000009481049

*1: Engine running at 3,000 rpm for 10 minutes.
*2: Drive at 90 km/h (55 MPH) for 30 minutes and then let idle for 10 minutes.
*3: After 60 minutes of cool down time.
For more information, refer to

CO-9, "Troubleshooting Chart"

.

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

Refer to

CO-11, "System Inspection"

3

• Coolant level

• Visual

Coolant up to MAX level
in reservoir tank and radi-
ator filler neck

See

CO-12, "Changing

Engine Coolant"

.

4

• Radiator cap

• Pressure tester

See

CO-11, "System Inspection"

.

ON*

1

5

• Coolant leaks

• Visual

No leaks

See

CO-11, "System In-

spection"

.

ON*

1

6

• Thermostat

• Touch the upper and

lower radiator hoses

Both hoses should be hot See

CO-11, "System In-

spection"

.

ON*

1

7

• Cooling fan

• Visual

Operating

See

CO-19, "Exploded

View"

.

OFF

8

• Combustion gas leak

• Color checker chemical

tester 4 Gas analyzer

Negative

—

ON*

2

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

See

CO-12, "Changing

Engine Coolant"

.

OFF*

3

10

• Coolant return from

reservoir tank to radia-
tor

• Visual

Should be initial level in
reservoir tank

See

CO-11, "System In-

spection"

.

OFF

11

• Cylinder head

• Straight gauge feeler

gauge

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

See

EM-67, "Exploded

View"

.

12

• Cylinder block and pis-

tons

• Visual

No scuffing on cylinder
walls or piston

See

CO-9, "Troubleshoot-

ing Chart"

.

EC-368

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P1225 TP SENSOR

P1225 TP SENSOR

Component Description

INFOID:0000000009481050

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 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 addition,

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 signals and the

ECM controls the throttle control motor to make the throttle valve

opening angle properly in response to driving condition.

On Board Diagnosis Logic

INFOID:0000000009481051

The MIL will not light up for this self-diagnosis.

DTC Confirmation Procedure

INFOID:0000000009481052

NOTE:

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 10V at idle.

WITH CONSULT

1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Check 1st trip DTC.
4. If 1st trip DTC is detected, go to

EC-368, "Diagnosis Procedure"

.

WITH GST

Follow the procedure “With CONSULT” above.

Diagnosis Procedure

INFOID:0000000009481053

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, and then perform throttle valve

closed position learning. Refer to

EC-123, "Throttle

Valve Closed Position Learning"

.

2.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

PBIB0145E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1225
1225

Closed throttle position learning
performance problem

Closed throttle position learning value is
excessively low.

• Electric throttle control actuator

(TP sensor 1 and 2)

BBIA0623E

P1225 TP SENSOR

EC-369

< DTC/CIRCUIT DIAGNOSIS >

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1. Replace the electric throttle control actuator. Refer to

EM-27, "Exploded View"

.

2. Perform

EC-123, "Throttle Valve Closed Position Learning"

.

3. Perform

EC-124, "Idle Air Volume Learning"

.

>> INSPECTION END

EC-370

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P1226 TP SENSOR

P1226 TP SENSOR

Component Description

INFOID:0000000009481054

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 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 addition,

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 signals and the

ECM controls the throttle control motor to make the throttle valve

opening angle properly in response to driving condition.

On Board Diagnosis Logic

INFOID:0000000009481055

The MIL will not light up for this self-diagnosis.

DTC Confirmation Procedure

INFOID:0000000009481056

NOTE:

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 10V at idle.

WITH CONSULT

1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Repeat steps 1 and 2 for 32 times.
4. Check 1st trip DTC.
5. If 1st trip DTC is detected, go to

EC-370, "Diagnosis Procedure"

.

WITH GST

Follow the procedure “With CONSULT” above.

Diagnosis Procedure

INFOID:0000000009481057

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, and then perform throttle valve

closed position learning. Refer to

EC-123, "Throttle

Valve Closed Position Learning"

.

PBIB0145E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1226
1226

Closed throttle position learning
performance problem

Closed throttle position learning is not performed
successfully, repeatedly.

• Electric throttle control actuator

(TP sensor 1 and 2)

BBIA0623E