Nissan Quest E52. Instruction — part 530
EC-330
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0507 ISC SYSTEM
NO
>> Repair or replace malfunctioning part.
2.
CHECK INTAKE AIR LEAKAGE
1.
Start engine and let it idle.
2.
Listen for an intake air leakage after the mass air flow sensor.
Is intake air leakage detected?
YES
>> Discover air leakage location and repair.
NO
>> Replace ECM. Refer to
P050A, P050E COLD START CONTROL
EC-331
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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P050A, P050E COLD START CONTROL
Description
INFOID:0000000009651165
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:0000000009651166
DTC DETECTION LOGIC
NOTE:
If DTC P050A, 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 4
°
C (39
°
F) and 36
°
C (97
°
F)?
YES
>> GO TO 3.
NO-1 [If it is below 4
°
C (39
°
F)]>>Warm up the engine until 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.
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 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” above.
Is 1st trip DTC detected?
YES
>> Proceed to
.
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.
EC-332
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P050A, P050E COLD START CONTROL
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009651167
1.
PERFORM IDLE AIR VOLUME LEARNING
Perform
Is Idle Air Volume Learning carried out successfully?
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
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace malfunctioning part
3.
CHECK FUEL INJECTION SYSTEM FUNCTION
Perform DTC Confirmation Procedure for DTC P0171, P0174. Refer to
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Proceed to
for DTC P0171, P0174.
4.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON.
2.
Erase DTC.
3.
Perform DTC Confirmation Procedure.
See
Is the 1st trip DTC P050A, P050E displayed again?
YES
>> Replace ECM. Refer to
EC-460, "Removal and Installation"
NO
>> INSPECTION END
P0603 ECM POWER SUPPLY
EC-333
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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P0603 ECM POWER SUPPLY
DTC Logic
INFOID:0000000009651168
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing 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.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON and wait at least 10 second.
2.
Turn ignition switch OFF and wait at least 5 minutes.
3.
Turn ignition switch ON, wait at least 10 seconds.
4.
Repeat steps 2 and 3 for five times.
5.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009651169
1.
CHECK ECM POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the voltage between ECM harness connector terminals.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Perform the trouble diagnosis for power supply circuit.
2.
CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace error-detected parts.
3.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0603
ECM power supply cir-
cuit
ECM back up RAM system does not function
properly.
• Harness or connectors
[ECM power supply (back up) circuit is
open or shorted.]
• ECM
ECM
Voltage
+
–
Connector
Terminal
Connector
Terminal
F7
26
E16
128
Battery voltage
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