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
INFOID:0000000001326915
DTC Confirmation Procedure
INFOID:0000000001326916
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
INFOID:0000000001326917
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
EC-1046
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DTC P1421 COLD START CONTROL
Perform
EC-861, "DTC Confirmation Procedure"
in DTC P0171, P0174 FUEL INJECTION SYSTEM FUNC-
TION.
OK or NG
OK
>> GO TO 4.
NG
>> Go to
4.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1.
Turn ignition switch ON.
2.
Select “SELF DIAG RESULTS” mode with CONSULT-III.
3.
Touch “ERASE”.
4.
Perform DTC Confirmation Procedure.
See
EC-1045, "DTC Confirmation Procedure"
5.
Is the 1st trip DTC P1421 displayed again?
With GST
1.
Turn ignition switch ON.
2.
Select Service $04 with GST.
3.
Perform DTC Confirmation Procedure.
See
EC-1045, "DTC Confirmation Procedure"
4.
Is the 1st trip DTC P1421 displayed again?
Yes or No
Yes
>> GO TO 5.
No
>> INSPECTION END
5.
REPLACE ECM
1.
Replace ECM.
2.
Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs.
Refer to
BL-187, "ECM Re-Communicating Function"
3.
4.
EC-662, "Accelerator Pedal Released Position Learning"
5.
EC-663, "Throttle Valve Closed Position Learning"
6.
EC-663, "Idle Air Volume Learning"
.
>> INSPECTION END
DTC P1564 ICC STEERING SWITCH
EC-1047
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DTC P1564 ICC STEERING SWITCH
Component Description
INFOID:0000000001326918
ICC steering switch has variant values of electrical resistance for each button. ECM reads voltage variation of
switch, and determines which button is operated.
CONSULT-III Reference Value in Data Monitor Mode
INFOID:0000000001326919
Specification data are reference values.
On Board Diagnosis Logic
INFOID:0000000001326920
This self-diagnosis has the one trip detection logic.
The MIL will not light up for this diagnosis.
NOTE:
If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to
.
1.
ICC steering switch
2.
MAIN switch
3.
DISTANCE switch
4.
CANCEL switch
5.
SET/COAST switch
6.
RESUME/ACCELERATE switch
PBIB3241E
MONITOR ITEM
CONDITION
SPECIFICATION
MAIN SW
• Ignition switch: ON
MAIN switch: Pressed
ON
MAIN switch: Released
OFF
CANCEL SW
• Ignition switch: ON
CANCEL switch: Pressed
ON
CANCEL switch: Released
OFF
RESUME/ACC SW
• Ignition switch: ON
RESUME/ACCELERATE switch:
Pressed
ON
RESUME/ACCELERATE switch: Re-
leased
OFF
SET SW
• Ignition switch: ON
SET/COAST switch: Pressed
ON
SET/COAST switch: Released
OFF
DIST SW
• Ignition switch: ON
DISTANCE switch: Pressed
ON
DISTANCE switch: Released
OFF
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P1564
1564
ICC steering switch
• An excessively high voltage signal from the
ICC steering switch is sent to ECM.
• ECM detects that input signal from the ICC
steering switch is out of the specified range.
• ECM detects that the ICC steering switch is
stuck ON.
• Harness or connectors
(The switch circuit is open or shorted.)
• ICC steering switch
• ECM
EC-1048
< SERVICE INFORMATION >
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DTC P1564 ICC STEERING SWITCH
DTC Confirmation Procedure
INFOID:0000000001326921
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.
1.
Turn ignition switch ON and wait at least 10 seconds.
2.
Press MAIN switch for at least 10 seconds, then release it and wait at least 10 seconds.
3.
Press CANCEL switch for at least 10 seconds, then release it and wait at least 10 seconds.
4.
Press RESUME/ACCELERATE switch for at least 10 seconds, then release it and wait at least 10 sec-
onds.
5.
Press SET/COAST switch for at least 10 seconds, then release it and wait at least 10 seconds.
6.
Press DISTANCE switch for at least 10 seconds, then release it and wait at least 10 seconds.
7.
Check DTC.
8.
If DTC is detected, go to
EC-1050, "Diagnosis Procedure"
.
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