Nissan Xterra. Manual - part 313

EC-378

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P1217 ENGINE OVER TEMPERATURE

*4: After 60 minutes of cool down time.
For more information, refer to 

CO-8, "Troubleshooting Chart"

.

P1225 TP SENSOR

EC-379

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P1225 TP SENSOR

Component Description

INFOID:0000000009484107

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:0000000009484108

The MIL will not illuminate for this diagnosis.

DTC Confirmation Procedure

INFOID:0000000009484109

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-379, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009484110

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-125, "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

Closed throttle position learning value is exces-
sively low.

• Electric throttle control actuator

(TP sensor 1 and 2)

BBIA0554E

EC-380

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P1225 TP SENSOR

1. Replace the electric throttle control actuator. Refer to 

EM-25, "Exploded View"

.

2. Perform 

EC-125, "Throttle Valve Closed Position Learning"

.

3. Perform 

EC-125, "Idle Air Volume Learning"

.

>> INSPECTION END

P1226 TP SENSOR

EC-381

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P1226 TP SENSOR

Component Description

INFOID:0000000009484111

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:0000000009484112

The MIL will not illuminate for this diagnosis.

DTC Confirmation Procedure

INFOID:0000000009484113

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-381, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009484114

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-125, "Throttle

Valve Closed Position Learning"

.

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