Nissan Frontier. Instruction — part 442
P0507 ISC SYSTEM
EC-339
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
OK
>> GO TO 3.
NG
>> Discover air leak location and repair.
3.
REPLACE ECM
1. Stop engine.
CAUTION:
Perform PROCEDURE AFTER REPLACING ECM. Refer to
EC-121, "Procedure After Replacing
.
2. Replace ECM.
>> INSPECTION END
EC-340
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
P050A, P050E COLD START CONTROL
P050A, P050E COLD START CONTROL
Description
INFOID:0000000009481012
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:0000000009481013
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
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 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
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” above.
Is 1st trip DTC detected?
YES
>> Go 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.
P050A, P050E COLD START CONTROL
EC-341
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009481014
1.
PERFORM IDLE AIR VOLUME LEARNING
Perform idle air volume learning. Refer to
EC-124, "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. Refer to
EC-228, "On Board Diagnosis Logic"
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Go to
4.
PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC Confirmation Procedure. Refer to
Is the 1st trip DTC P050A or P050E displayed again?
YES
>> GO TO 5.
NO
>> INSPECTION END
5.
REPLACE ECM
CAUTION:
Perform PROCEDURE AFTER REPLACING ECM. Refer to
EC-121, "Procedure After Replacing ECM"
1. Replace ECM.
2. Refer to
EC-121, "Procedure After Replacing ECM"
.
>> INSPECTION END
EC-342
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
P0550 PSP SENSOR
P0550 PSP SENSOR
Component Description
INFOID:0000000009481015
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:0000000009481016
The MIL will not light up 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:0000000009481017
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.
WITH CONSULT
1. Start engine and let it idle for at least 5 seconds.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to
WITH GST
Follow the procedure “WITH CONSULT” above.
Diagnosis Procedure
INFOID:0000000009481018
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body. Refer to
.
OK or NG
OK
>> GO TO 2.
BBIA0621E
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
BBIA0614E
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