Nissan Altima L32. Instruction — part 568
P1225 TP SENSOR
EC-1393
< COMPONENT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
3. Check if foreign matter is caught between the throttle valve (1)
and the housing.
-
Electric throttle control actuator (2)
-
: Vehicle front
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-1393, "Special Repair Requirement"
>> INSPECTION END
Special Repair Requirement
INFOID:0000000004362248
1.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
EC-1053, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"
>> GO TO 2.
2.
PERFORM IDLE AIR VOLUME LEARNING
EC-1053, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"
>> END
ALBIA0124ZZ
EC-1394
< COMPONENT DIAGNOSIS >
[VQ35DE]
P1226 TP SENSOR
P1226 TP SENSOR
Description
INFOID:0000000004362249
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 potentiometer which transform the throttle valve position into
output voltage, and emit the voltage signals to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and controls the throttle valve opening angle in response to
driving conditions via the throttle control motor.
DTC Logic
INFOID:0000000004362250
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
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 10 V 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. Repeat steps 2 and 3 for 32 times.
5. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
EC-1394, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000004362251
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)
P1226 TP SENSOR
EC-1395
< COMPONENT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
3. Check if foreign matter is caught between the throttle valve (1)
and the housing.
-
Electric throttle control actuator (2)
-
: Vehicle front
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-1393, "Special Repair Requirement"
>> INSPECTION END
Special Repair Requirement
INFOID:0000000004362252
1.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
EC-1053, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"
>> GO TO 2.
2.
PERFORM IDLE AIR VOLUME LEARNING
EC-1053, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"
>> END
ALBIA0124ZZ
EC-1396
< COMPONENT DIAGNOSIS >
[VQ35DE]
P1421 COLD START CONTROL
P1421 COLD START CONTROL
Description
INFOID:0000000004362253
ECM controls ignition timing and engine idle speed when engine is started with pre-warming up condition.
This control promotes the activation of three way catalyst by heating the catalyst and reduces emissions.
DTC Logic
INFOID:0000000004362254
DTC DETECTION LOGIC
NOTE:
• If DTC P1421 is displayed with other DTC, first perform the trouble diagnosis for other DTC.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
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 11 V at idle.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-III.
3. 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 steps.
If “COOLAN TEMP/S” indication is out of the specified value, cool engine down or warm engine up and go
to step 1.
4. Start engine and let it idle for 5 minutes.
5. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
YES
>> Go to
EC-1396, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000004362255
1.
PERFORM IDLE AIR VOLUME LEARNING
Perform
EC-1053, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"
.
Is Idle Air Volume Learning carried out successfully?
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.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1421
Cold start emission reduction
strategy monitoring
ECM does not control ignition timing and engine
idle speed properly when engine is started with
pre-warming up condition.
• Lack of intake air volume
• Fuel injection system
• ECM
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