2009 NISSAN LATIO Service Repair Manual

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Page 2777 of 4331

NISSAN LATIO 2009 Service Repair Manual EC
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DTC P1421 COLD START CONTROL
Description INFOID:0000000004500297
ECM controls ignition timing and engine idle speed when engine is started with prewarming up condition.
This control promotes t

EC
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DTC P1421 COLD START CONTROL
Description INFOID:0000000004500297
ECM controls ignition timing and engine idle speed when engine is started with prewarming up condition.
This control promotes the activation of three way ca talyst by heating the catalyst and reduces emissions.
On Board Diagnosis Logic INFOID:0000000004500298
DTC Confirmation Procedure INFOID:0000000004500299
NOTE:
• If DTC Confirmation Procedure has been previously conduc ted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
• If DTC P1421 is displayed with other DTC, firs t 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 TE MP/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 “COOLAN TEMP/S” indication is out of the s pecified 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-1421, " Diagnosis Procedure " .
Diagnosis Procedure INFOID:0000000004500300Idle 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. OK >> GO TO 3.
NG >> Repair or replace malfunctioning part DTC Confirmation Procedure " for DTC P0171.
OK or NG OK >> GO TO 4.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

Page 2778 of 4331

NISSAN LATIO 2009 Service Repair Manual Diagnosis Procedure " for DTC P0171.
DTC Confirmation Procedure " .
3. Is the 1st trip DTC P1421 displayed again?
Yes or No Yes >> GO TO 5.
No >> INSPECTION END ECM Re-communicating Function "

Page 2779 of 4331

NISSAN LATIO 2009 Service Repair Manual DTC P1564 ASCD STEERING SWITCH
EC-1423
< SERVICE INFOMATION >
[MR TYPE 2] C
D E
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G H
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M A EC
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DTC P1564 ASCD STEERING SWITCH
Component Description INFOID:0000000004500301
ASCD steering swi

Page 2780 of 4331

NISSAN LATIO 2009 Service Repair Manual Diagnosis Procedure " .

Page 2781 of 4331

NISSAN LATIO 2009 Service Repair Manual EC
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Wiring Diagram
INFOID:0000000004500305
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals wh en measuring inpu

Page 2782 of 4331

NISSAN LATIO 2009 Service Repair Manual EC-1426< SERVICE INFOMATION >
[MR TYPE 2]
DTC P1564 ASCD STEERING SWITCH
Diagnosis Procedure INFOID:00000000045003061.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten gro

Page 2783 of 4331

NISSAN LATIO 2009 Service Repair Manual DTC P1564 ASCD STEERING SWITCH
EC-1427
< SERVICE INFOMATION >
[MR TYPE 2] C
D E
F
G H
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M A EC
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Without CONSULT-III
1. Turn ignition switch ON.
2. Check voltage between ECM terminal 94 and

Page 2784 of 4331

NISSAN LATIO 2009 Service Repair Manual EC-1428< SERVICE INFOMATION >
[MR TYPE 2]
DTC P1564 ASCD STEERING SWITCH
OK >> GO TO 7.
NG >> GO TO 6. 6.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M69, E7
• Combination

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