Infiniti Q45. Manual — part 460
DTC P0507 ISC SYSTEM
EC-479
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Diagnostic Procedure
NBS001YU
1.
CHECK PCV HOSE CONNECTION
Confirm that PCV hose is connected correctly.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace.
2.
CHECK INTAKE AIR LEAK
1.
Start engine and let it idle.
2.
Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK
>> GO TO 3.
NG
>> Discover air leak location and repair.
3.
REPLACE ECM
1.
Stop engine.
2.
Replace ECM.
3.
Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to
BL-202, "ECM Re-Communicating Function"
4.
Perform
.
5.
Perform
EC-77, "Accelerator Pedal Released Position Learning"
6.
Perform
EC-78, "Throttle Valve Closed Position Learning"
7.
Perform
EC-78, "Idle Air Volume Learning"
>> INSPECTION END
EC-480
DTC P0550 PSP SENSOR
DTC P0550 PSP SENSOR
PFP:49763
Component Description
NBS001YV
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.
CONSULT-II Reference Value in Data Monitor Mode
NBS001YW
Specification data are reference values.
On Board Diagnosis Logic
NBS001YX
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
EC-492, "DTC P0643 SENSOR POWER SUPPLY"
.
DTC Confirmation Procedure
NBS001YY
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-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and let it idle for at least 5 seconds.
4.
If 1st trip DTC is detected, go to
EC-482, "Diagnostic Procedure"
.
WITH GST
Follow the procedure WITH CONSULT-II above.
PBIB0027E
MONITOR ITEM
CONDITION
SPECIFICATION
PW/ST SIGNAL
●
Engine: After warming up, idle the
engine
Steering wheel: Not being turned
OFF
Steering wheel: Being turned
ON
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
SEF058Y
DTC P0550 PSP SENSOR
EC-481
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Wiring Diagram
NBS001YZ
TBWM0556E
EC-482
DTC P0550 PSP SENSOR
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic Procedure
NBS001Z0
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.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
12
R
Power steering pressure
sensor
[Engine is running]
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Steering wheel: Being turned
0.5 - 4.5V
[Engine is running]
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Steering wheel: Not being turned
0.4 - 0.8V
67
B
Sensor ground
(MAF sensor, IAT sensor,
ECT sensor, FTT sensor,
EVAP control system pres-
sure sensor, PSP sensor,
ICC steering switch, ASCD
steering switch, Refrigerant
pressure sensor)
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 0V
68
L
Sensor power supply
(Power steering pressure
sensor)
[Ignition switch: ON]
Approximately 5V
PBIB2417E
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