Nissan Titan. Manual - part 263
P050A, P050B, P050E COLD START CONTROL
EC-353
< DTC/CIRCUIT DIAGNOSIS >
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P050A, P050B, P050E COLD START CONTROL
Description
INFOID:0000000009886769
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:0000000009886770
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 11 V or more 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 5
°C (41°F) and 36°C (97°F)?
YES
>> GO TO 3.
NO-1 [If it is below 5
°C (41°F)]>>Warm up the engine until the value of “COOLAN TEMP/S” reaches 5°C
(41
°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 5
°C (41°F) and 40°C
(104
°F) for more than 15 seconds.
3. Check 1st trip DTC.
DTC No.
Trouble diagnosis name
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 con-
dition.
• Lack of intake air volume
• Fuel injection system
• ECM
P050B
Cold start ignition timing perfor-
mance
ECM does not control engine timing properly
when engine is started with pre-warming up con-
dition.
P050E
Cold start engine exhaust temper-
ature 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.