Nissan Frontier. Manual — 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
.
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
3
• Coolant level
• Visual
Coolant up to MAX level
in reservoir tank and radi-
ator filler neck
See
.
4
• Radiator cap
• Pressure tester
See
ON*
1
5
• Coolant leaks
• Visual
No leaks
See
ON*
1
6
• Thermostat
• Touch the upper and
lower radiator hoses
Both hoses should be hot See
ON*
1
7
• Cooling fan
• Visual
Operating
See
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
.
OFF*
3
10
• Coolant return from
reservoir tank to radia-
tor
• Visual
Should be initial level in
reservoir tank
See
OFF
11
• Cylinder head
• Straight gauge feeler
gauge
0.1 mm (0.004 in) Maxi-
mum distortion (warping)
See
12
• Cylinder block and pis-
tons
• Visual
No scuffing on cylinder
walls or piston
See
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
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
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
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
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
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
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