2006 NISSAN VERSA Workshop Service Repair Manual

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Page 1633 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual EC-464Revision: June 2006
DTC P1421 COLD START CONTROL
2007 Versa
DTC P1421 COLD START CONTROLPFP:23710
DescriptionUBS00QLB
ECM controls ignition timing and engine idle speed when engine is started wi

EC-464Revision: June 2006
DTC P1421 COLD START CONTROL
2007 Versa
DTC P1421 COLD START CONTROLPFP:23710
DescriptionUBS00QLB
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 LogicUBS00QLC
DTC Confirmation ProcedureUBS00QLD
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-II
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Select “DATA MONITOR” mode with CONSULT-II.
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. If 1st trip DTC is detected, go to EC-464, "
Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
Diagnostic ProcedureUBS00QLE
1. PERFORM IDLE AIR VOLUME LEARNING
Perform EC-78, "
Idle Air Volume Learning" .
Is Idle Air Volume Learning carried out successfully?
Ye s o r N o
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
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1421
1421Cold start emission reduction
strategy monitoringECM 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
SEF 1 74 Y

Page 1634 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual DTC P1421 COLD START CONTROL
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3. CHECK FUEL INJECTION SYSTEM FUNCTION
Perform EC-276, "
DTC Confirmation Procedure" for DTC P0171.
OK or

Page 1635 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual EC-466Revision: June 2006
DTC P1564 ASCD STEERING SWITCH
2007 Versa
DTC P1564 ASCD STEERING SWITCHPFP:25551
Component DescriptionUBS00QLF
ASCD steering switch has variant values of electrical resistan

Page 1636 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual DTC P1564 ASCD STEERING SWITCH
EC-467
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DTC Confirmation ProcedureUBS00QLI
NOTE:
If DTC Confirmation Procedure has been previously conducted, alwa

Page 1637 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual EC-468Revision: June 2006
DTC P1564 ASCD STEERING SWITCH
2007 Versa
Wiring DiagramUBS00QLJ
BBWA2663E

Page 1638 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual DTC P1564 ASCD STEERING SWITCH
EC-469
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Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not

Page 1639 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual EC-470Revision: June 2006
DTC P1564 ASCD STEERING SWITCH
2007 Versa
2. CHECK ASCD STEERING SWITCH CIRCUIT
With CONSULT-II
1. Turn ignition switch ON.
2. Select “MAIN SW”, “RESUME/ACC SW”, “

Page 1640 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual DTC P1564 ASCD STEERING SWITCH
EC-471
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4. DETECT MALFUNCTIONING PART
Check the following.
Harness connectors M69, E7
Combination switch (spiral

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