Infiniti FX35 / FX45. Manual - part 571
DTC P1421 COLD START CONTROL
EC-1045
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DTC P1421 COLD START CONTROL
Description
INFOID:0000000001326914
ECM controls ignition timing and engine idle speed when engine is started with prewarming up condition.
This control promotes the activation of three way catalyst by heating the catalyst and reduces emissions.
On Board Diagnosis Logic
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DTC Confirmation Procedure
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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.
• If DTC P1421 is displayed with other DTC, first perform the trouble diagnosis for other DTC.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-III
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Select “DATA MONITOR” mode with CONSULT-III.
4.
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 step.
If “COOLANT TEMP/S” indication is out of the specified value, cool engine down or warm engine up and
go to step 1.
5.
Start engine and let it idle for 5 minutes.
6.
Check 1st trip DTC.
7.
If 1st trip DTC is detected, go to
EC-1045, "Diagnosis Procedure"
WITH GST
Follow the procedure “WITH CONSULT-III” above.
Diagnosis Procedure
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1.
PERFORM IDLE AIR VOLUME LEARNING
Perform
EC-663, "Idle Air Volume Learning"
.
Is Idle Air Volume Learning carried out successfully?
Yes or No
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
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace malfunctioning part
3.
CHECK FUEL INJECTION SYSTEM FUNCTION
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1421
1421
Cold start emission reduction
strategy monitoring
ECM does not control ignition timing and engine
idle speed properly when engine is started with
prewarming up condition.
• Lack of intake air volume
• Fuel injection system
• ECM