Nissan Altima 2007-2012 Service Manual: P1421 Cold start control
Description
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
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 conducting 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
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.
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected? YES >> Go to EC-1396, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure
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.
• Crushed intake air passage
• Intake air passage clogging
Is the inspection result normal? YES >> GO TO 3.
NO >> Repair or replace malfunctioning part
3.CHECK FUEL INJECTION SYSTEM FUNCTION
Perform EC-1266, "DTC Logic" for DTC P0171, P0174.
Is the inspection result normal? YES >> GO TO 4.
NO >> Go to EC-1267, "Diagnosis Procedure" for DTC P0171, P0174.
4.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC CONFIRMATION PROCEDURE.
See EC-1396, "DTC Logic".
Is the 1st trip DTC P1421 displayed again? YES >> GO TO 5.
NO >> INSPECTION END
5.REPLACE ECM
1. Replace ECM.
2. Go to EC-1051, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Requirement".
>> INSPECTION END
P1226 TP Sensor
Description
Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The thrott ...
P1550 Battery current sensor
Description
The power generation voltage variable control enables fuel consumption to
be decreased by reducing the
engine load which is caused by the power generation of the generator. The
batte ...
Other materials:
Service data and specifications
(SDS)
General Specifications
TRANSAXLE
FINAL GEAR
End Play
Baulk Ring Clearance
Dimension
Differential Side Bearing Preload
Differential Side Gear Clearance
...
B210E starter relay
Description
Located in IPDM E/R, it runs the starter motor. The starter relay is turned
ON by the BCM when the ignition
switch is in START position. IPDM E/R transmits the starter relay ON signal to
BCM via CAN communication.
DTC Logic
DTC DETECTION LOGIC
NOTE:
• If DTC B210E is displa ...
Side ventilator grilles
Removal and Installation
REMOVAL
Release the tabs and then remove the side ventilator grilles using a suitable
tool.
CAUTION:
Use a suitable tool to remove the grille to avoid damage to the instrument
panel.
INSTALLATION
Installation is in the reverse order of removal.
REMOVAL
1. ...