Infiniti QX56 (Z62). Manual — part 596
EC-362
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P050E COLD START CONTROL
P050E COLD START CONTROL
Description
INFOID:0000000006288336
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:0000000006288337
DTC DETECTION LOGIC
NOTE:
If DTC P050E is displayed with other DTC, first perform the trouble diagnosis for other DTC.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
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-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 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-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 5
°
C (41
°
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
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006288338
1.
PERFORM IDLE AIR VOLUME LEARNING
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
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.
• Lack of intake air volume
• Fuel injection system
• ECM
P050E COLD START CONTROL
EC-363
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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 P050E displayed again?
YES
>> GO TO 5.
NO
>> INSPECTION END
5.
REPLACE ECM
EC-535, "Removal and Installation"
>> INSPECTION END
EC-364
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0524 ENGINE OIL PRESSURE
P0524 ENGINE OIL PRESSURE
DTC Logic
INFOID:0000000006288342
DTC DETECTION LOGIC
NOTE:
If DTC P0524 is displayed with DTC P0075 or P0081, perform trouble diagnosis for DTC P0075 or P0081
first. Refer to
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING-I
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 between 10 V and 16 V at
idle.
>> GO TO 2.
2.
PRECONDITIONING-II
Check oil level and oil pressure. Refer to
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Proceed to
.
3.
PERFORM DTC CONFIRMATION PROCEDURE
WITH CONSULT-III
1.
Select “DATA MONITOR” mode with CONSULT-III.
2.
Maintain the following conditions for at least 20 consecutive seconds.
CAUTION:
Always drive at a safe speed.
3.
Check 1st trip DTC.
WITH GST
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
YES
>> Proceed to
DTC No.
Trouble diagnosis name
(Trouble diagnosis content)
Detecting condition
Possible cause
P0524
ENGINE OIL PRESSURE
(Engine oil pressure too low)
Engine oil pressure is low because
there is a gap between angle of target
and phase-control angle.
• Engine oil pressure or level too low
• Crankshaft position sensor
• Camshaft position sensor
• Intake valve timing control solenoid valve
• Accumulation of debris to the signal pick-up por-
tion of the camshaft
• Timing chain installation
• Foreign matter caught in the oil groove for intake
valve timing control
ENG SPEED
More than 1,700 rpm
COOLAN TEMP/S
More than 70
°
C (158
°
F)
Selector lever
1st or 2nd position
Driving location uphill
Driving vehicle uphill
(Increased engine load will help maintain the driving
conditions required for this test.)
P0524 ENGINE OIL PRESSURE
EC-365
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006288343
1.
CHECK OIL PRESSURE WARNING LAMP
1.
Start engine.
2.
Check oil pressure warning lamp and confirm it is not illumi-
nated.
Is oil pressure warning lamp illuminated?
YES
>> Proceed to
NO
>> GO TO 2.
2.
CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE
EC-179, "Component Inspection (Intake Valve Timing Control Solenoid Valve)"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace malfunctioning intake valve timing control solenoid valve.
3.
CHECK CRANKSHAFT POSITION SENSOR
EC-301, "Component Inspection (Crankshaft Position Sensor)"
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace crankshaft position sensor.
4.
CHECK CAMSHAFT POSITION SENSOR
EC-306, "Component Inspection (Camshaft Position Sensor)"
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace malfunctioning camshaft position sensor.
5.
CHECK CAMSHAFT SPROCKET (SIGNAL PLATE)
Check the following.
• Accumulation of debris to the signal plate of camshaft sprocket
(INT)
• Chipping signal plate of camshaft sprocket (INT)
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Remove debris and clean the signal plate of camshaft
sprocket (INT) or replace camshaft sprocket (INT).
Refer to
.
6.
CHECK TIMING CHAIN INSTALLATION
Check service records for any recent repairs that may cause timing chain misaligned.
Are there any service records that may cause timing chain misaligned?
YES
>> Check timing chain installation. Refer to
NO
>> GO TO 7.
7.
CHECK LUBRICATION CIRCUIT
Perform “Inspection of Camshaft Sprocket (INT) Oil Groove”. Refer to
PBIA8559J
JMBIA0962ZZ
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