Nissan Versa Note. Manual - part 338
EC-334
< DTC/CIRCUIT DIAGNOSIS >
[HR16DE]
P050A, P050B, P050E COLD START CONTROL
P050A, P050B, P050E COLD START CONTROL
Description
INFOID:0000000009020836
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
INFOID:0000000009020837
DTC DETECTION LOGIC
NOTE:
If DTC P050A, P050B or P050E 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 procedure
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-I
With CONSULT
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Select “DATA MONITOR” mode with CONSULT.
4. Check the indication of “COOLAN TEMP/S”.
With GST
Follow the procedure “With CONSULT” above.
Is the value of “COOLAN TEMP/S” between 15
°C (59°F) and 36°C (97°F)?
YES
>> GO TO 3.
NO-1 [If it is below 15
°C (59°F)]>>Warm up the engine until the value of “COOLAN TEMP/S” reaches 15°C
(59
°F) or more. Retry from step 1.
NO-2 [If it is above 36
°C (97°F)]>>Cool engine down to less than 36°C (97°F). Retry from step 1.
3.
PERFORM DTC CONFIRMATION PROCEDURE-II
With CONSULT
1. Set the select lever in N range.
2. Start the engine and warm up in idle with the value of “COOLAN TEMP/S” between 15
°C (59°F) and 40°C
(104
°F) for more than 15 seconds.
3. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT” above.
DTC No.
Trouble diagnosis content
DTC detecting condition
Possible cause
P050A
Cold start idle air control
system performance
ECM does not control engine idle speed properly when engine
is started with pre-warming up condition.
• Lack of intake air volume
• Fuel injection system
• ECM
P050B
Cold start ignition timing
performance
ECM does not control ignition timing properly when engine is
started with pre-warming up condition.
P050E
Cold start engine exhaust
temperature too low
The temperature of the catalyst inlet does not rise to the proper
temperature when the engine is started with pre-warming up
condition.