Nissan Frontier D40. Manual — part 514
P0507 ISC SYSTEM
EC-747
< COMPONENT DIAGNOSIS >
[VQ40DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
3.
REPLACE ECM
1.
Stop engine.
2.
Replace ECM.
3.
Perform initialization of NVIS(NATS) system and registration of all NVIS(NATS) ignition key IDs. Refer to
SEC-7, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Requirement"
.
4.
5.
EC-473, "Accelerator Pedal Released Position Learning"
.
6.
EC-473, "Throttle Valve Closed Position Learning"
7.
EC-473, "Idle Air Volume Learning"
.
>> INSPECTION END
EC-748
< COMPONENT DIAGNOSIS >
[VQ40DE]
P050E COLD START CONTROL
P050E COLD START CONTROL
Description
INFOID:0000000005552924
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.
On Board Diagnosis Logic
INFOID:0000000005574974
NOTE:
If DTC P050E is displayed with other DTC, first perform the trouble diagnosis for other DTC.
DTC Confirmation Procedure
INFOID:0000000005574975
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-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 15
°
C (59
°
F) and 36
°
C (97
°
F)?
YES
>> GO TO 3.
NO-1 [If it is below 15
°
C (59
°
F)]>>Warm up the engine until the value of “COOLAN TEMP/S” reaches 15
°
C
(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.
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 15
°
C (59
°
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
NO
>> INSPECTION END
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-749
< COMPONENT DIAGNOSIS >
[VQ40DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Diagnosis Procedure
INFOID:0000000005552926
1.
PERFORM IDLE AIR VOLUME LEARNING
Perform
EC-473, "Idle Air Volume Learning"
.
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
EC-635, "DTC Confirmation Proce-
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Go to
for DTC P0171, P0174.
4.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON.
2.
Erase DTC.
3.
Perform DTC Confirmation Procedure.
See
EC-748, "DTC Confirmation Procedure"
Is the 1st trip DTC P050E displayed again?
YES
>> GO TO 5.
NO
>> INSPECTION END
5.
REPLACE ECM
1.
Replace ECM.
2.
Go to
EC-472, "Procedure After Replacing ECM"
>> INSPECTION END
EC-750
< COMPONENT DIAGNOSIS >
[VQ40DE]
P0550 PSP SENSOR
P0550 PSP SENSOR
Component Description
INFOID:0000000005273727
Power steering pressure (PSP) sensor is installed to the power
steering high-pressure tube and detects a power steering load. This
sensor is a potentiometer which transforms the power steering load
into output voltage, and emits the voltage signal to the ECM. The
ECM controls the electric throttle control actuator and adjusts the
throttle valve opening angle to increase the engine speed and
adjusts the idle speed for the increased load.
On Board Diagnosis Logic
INFOID:0000000005273728
The MIL will not illuminate for this diagnosis.
NOTE:
If DTC P0550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
.
DTC Confirmation Procedure
INFOID:0000000005273729
1.
If DTC Confirmation Procedure has been previously conducted, always perform the following before con-
ducting the next step.
a.
Turn ignition switch OFF and wait at least 10 seconds.
b.
Turn ignition switch ON.
c.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Start engine and let it idle for at least 5 seconds.
3.
Check 1st trip DTC.
4.
If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000005273730
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten three ground screws on the body. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
BBIA0552E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0550
0550
Power steering pressure
sensor circuit
An excessively low or high voltage from the
sensor is sent to ECM.
• Harness or connectors
(The sensor circuit is open or shorted)
• Power steering pressure sensor
BBIA0539E
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