Infiniti FX35 / FX45. Manual — part 413
DTC P0550 PSP SENSOR
EC-413
< SERVICE INFORMATION >
[VQ35DE]
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DTC P0550 PSP SENSOR
Component Description
INFOID:0000000001326254
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-III Reference Value in Data Monitor Mode
INFOID:0000000001326255
Specification data are reference values.
On Board Diagnosis Logic
INFOID:0000000001326256
The MIL will not light up for this self-diagnosis.
NOTE:
If DTC P0550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.
Refer to
.
DTC Confirmation Procedure
INFOID:0000000001326257
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.
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
PBIB1579E
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
(Power steering pressure sensor circuit is
open or shorted)
• Power steering pressure sensor
EC-414
< SERVICE INFORMATION >
[VQ35DE]
DTC P0550 PSP SENSOR
Wiring Diagram
INFOID:0000000001326258
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.
TBWM0302E
DTC P0550 PSP SENSOR
EC-415
< SERVICE INFORMATION >
[VQ35DE]
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Diagnosis Procedure
INFOID:0000000001326259
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten ground screw on the body. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK POWER STEERING PRESSURE (PSP) SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect power steering pressure (PSP) sensor harness con-
nector.
2.
Turn ignition switch ON.
TER-
MI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
12
R/G
Power steering pressure
sensor
[Engine is running]
• Steering wheel: Being turned.
0.5 - 4.5V
[Engine is running]
• Steering wheel: Not being turned.
0.4 - 0.8V
67
B/W
Sensor ground
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 0V
68
BR
Sensor power supply
(Power steering pressure
sensor)
[Ignition switch: ON]
Approximately 5V
PBIB2625E
PBIB1579E
EC-416
< SERVICE INFORMATION >
[VQ35DE]
DTC P0550 PSP SENSOR
3.
Check voltage between PSP sensor terminal 1 and ground with
CONSULT-III or tester.
OK or NG
OK
>> GO TO 3.
NG
>> Repair open circuit or short to ground or short to power
in harness or connectors.
3.
CHECK POWER STEERING PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between PSP sensor terminal 3 and ECM terminal 67.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK POWER STEERING PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check harness continuity between ECM terminal 12 and PSP sensor terminal 2.
Refer to Wiring Diagram.
2.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK POWER STEERING PRESSURE SENSOR
EC-416, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace power steering pressure sensor.
6.
CHECK INTERMITTENT INCIDENT
>> INSPECTION END
Component Inspection
INFOID:0000000001326260
POWER STEERING PRESSURE SENSOR
1.
Reconnect all harness connectors disconnected.
2.
Start engine and let it idle.
Voltage: Approximately 5V
PBIB0188E
Continuity should exist.
Continuity should exist.
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