Nissan Altima L32. Manual - part 439

P1217 ENGINE OVER TEMPERATURE

EC-877

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

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*1: Turn the ignition switch ON.
*2: Engine running at 3,000 rpm for 10 minutes.
*3: Drive at 90 km/h (56 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"

.

>> INSPECTION END

OFF

12

• Cylinder head

• Straight gauge feeler 

gauge

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

EM-68, "Inspection After 
Disassembly"

13

• Cylinder block and pis-

tons

• Visual

No scuffing on cylinder 
walls or piston

EM-83, "Inspection After 
Disassembly"

Engine

Step

Inspection item

Equipment

Standard

Reference page

EC-878

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

P1225 TP SENSOR

P1225 TP SENSOR

Description

INFOID:0000000004349844

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.

DTC Logic

INFOID:0000000004349845

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.

TESTING CONDITION:

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

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

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.
Is 1st trip DTC detected?

YES

>> Go to 

EC-878, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004349846

1.

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY

1. Turn ignition switch OFF.

2. Remove the intake air duct.

PBIB0145E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1225

Closed throttle position 
learning performance

Closed throttle position learning value is exces-
sively low.

• Electric throttle control actuator

(TP sensor 1 and 2)

P1225 TP SENSOR

EC-879

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

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3. Check if foreign matter is caught between the throttle valve (1)

and the housing.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Remove the foreign matter and clean the electric throttle

control actuator inside.

2.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1. Replace electric throttle control actuator.

2. Go to 

EC-923, "Special Repair Requirement"

.

>> INSPECTION END

Special Repair Requirement

INFOID:0000000004349847

1.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Refer to 

EC-565, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"

>> GO TO 2.

2.

PERFORM IDLE AIR VOLUME LEARNING

Refer to 

EC-566, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"

>> END

2.

Electric throttle control actuator

: Vehicle front

ALBIA0061ZZ

EC-880

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

P1226 TP SENSOR

P1226 TP SENSOR

Description

INFOID:0000000004349848

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.

DTC Logic

INFOID:0000000004349849

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.

TESTING CONDITION:

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

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Turn ignition switch OFF, wait at least 10 seconds.

3. Turn ignition switch ON.

4. Repeat steps 2 and 3 for 32 times.

5. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Go to 

EC-880, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004349850

1.

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY

1. Turn ignition switch OFF.

2. Remove the intake air duct.

PBIB0145E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1226

Closed throttle position 
learning performance

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

• Electric throttle control actuator

(TP sensor 1 and 2)