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Nissan Cube. Manual - part 356

EC-310

< DTC/CIRCUIT DIAGNOSIS >

[MR18DE]

P050A, P050E COLD START CONTROL

P050A, P050E COLD START CONTROL

Description

INFOID:0000000009947427

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:0000000009947428

DTC DETECTION LOGIC

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

DTC CONFIRMATION PROCEDURE

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.

Turn ignition switch ON.

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.

PERFORM DTC CONFIRMATION PROCEDURE-I

With CONSULT

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Select “DATA MONITOR” mode with CONSULT.

Check the indication of “COOLAN TEMP/S”.

With GST

Follow the procedure “With CONSULT” above.

Is the value of “COOLAN TEMP/S” between 4

C (59

F) and 36

C (97

F)?

YES

>> GO TO 3.

NO-1 [If it is below 4

C (59

F)]>>Warm up the engine until the value of “COOLAN TEMP/S” reaches 4

(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.

PERFORM DTC CONFIRMATION PROCEDURE-II

With CONSULT

Set the select lever in N range.

Start the engine and warm up in idle with the value of “COOLAN TEMP/S” between 4

C (59

F) and 40

(104

F) for more than 15 seconds.

Check 1st trip DTC.

With GST

Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?

YES

>> Go to

EC-311, "Diagnosis Procedure"

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

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.

P050A, P050E COLD START CONTROL

EC-311

< DTC/CIRCUIT DIAGNOSIS >

[MR18DE]

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009947429

PERFORM IDLE AIR VOLUME LEARNING

Perform

EC-20, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"

Is Idle Air Volume Learning carried out successfully?

YES

>> GO TO 2.

>> Follow the instruction of Idle Air Volume Learning.

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

Is the inspection result normal?

YES

>> GO TO 3.

>> Repair or replace malfunctioning part

CHECK FUEL INJECTION SYSTEM FUNCTION

Perform DTC Confirmation Procedure for DTC P0171. Refer to

EC-215, "DTC Logic"

Is the inspection result normal?

YES

>> GO TO 4.

>> Go to

EC-216, "Diagnosis Procedure"

for DTC P0171.

PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON.

Erase DTC.

Perform DTC Confirmation Procedure.
See

EC-310, "DTC Logic"

Is the 1st trip DTC P050A or P050E displayed again?

YES

>> GO TO 5.

>> INSPECTION END

REPLACE ECM

Replace ECM.

Go to

EC-16, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-

ment"

>> INSPECTION END

EC-312

< DTC/CIRCUIT DIAGNOSIS >

[MR18DE]

P0605 ECM

P0605 ECM

Description

INFOID:0000000009947430

The ECM consists of a microcomputer and connectors for signal
input and output and for power supply. The ECM controls the engine.

DTC Logic

INFOID:0000000009947431

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.

>> GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A

Turn ignition switch ON.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to

EC-313, "Diagnosis Procedure"

>> GO TO 3.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B

Turn ignition switch ON and wait at least 1 second.

Turn ignition switch OFF, wait at least 10 seconds and then turn ON.