Except For California

DTC P050A, P050B, P050E COLD START CONTROL





Description
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
If DTC P050A, P050B or P050E is displayed with other DTC, first perform the trouble diagnosis for other DTC.









DTC Confirmation Procedure

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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
1.PERFORM DTC CONFIRMATION PROCEDURE-I
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 the indication of "COOLAN TEMP/S".
WITH GST
Follow the procedure "WITH CONSULT-III" above.
Is the value of "COOLAN TEMP/S" between 4�C (39�F) and 36�C (97�F)?
YES - GO TO 2.
NO-1 [If it is below 4�C (39�F)]-Warm up the engine unit the value of "COOLAN TEMP/S" reaches 4�C
(39�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.
2.PERFORM DTC CONFIRMATION PROCEDURE-II
WITH CONSULT-III
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 4�C (39�F) and 40�C
(104�F) for more than 15 seconds.
3. Check 1st trip DTC.
WITH GST
Follow the procedure "WITH CONSULT-III" above.
Is 1st trip DTC detected?
YES - Go to SEE Diagnosis Procedure.
NO - INSPECTION END




Diagnosis Procedure
1.PERFORM IDLE AIR VOLUME LEARNING
Perform For California.
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
- Clogging of throttle body
OK or NG
OK - GO TO 3.
NG - Repair or replace malfunctioning part
3.CHECK FUEL INJECTION SYSTEM FUNCTION
Perform Engine Controls (For California) for DTC P0171.
OK or NG
OK - GO TO 4.
NG - Go to Engine Controls (For California) for DTC P0171.
4.PERFORM DTC CONFIRMATION PROCEDURE
1. Erase DTC.
2. Perform DTC Confirmation Procedure.
See SEE DTC Confirmation Procedure.
3. Is the 1st trip DTC P050A, P050B, P050E displayed again?
Yes or No
Yes - GO TO 5.
No - INSPECTION END
5.REPLACE ECM
1. Replace ECM.
2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. NATS (Nissan Anti-Theft System).
3. Perform For California.
4. Perform For California.
5. Perform For California.
6. Perform For California.
- INSPECTION END