Infiniti F50. Manual — part 440
DTC P0550 PSP SENSOR
EC-401
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EC
DTC P0550 PSP SENSOR
PFP:49763
Component Description
EBS00MGB
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
EBS00MGC
Specification data are reference values.
On Board Diagnosis Logic
EBS00MGD
The MIL will not light up for this diagnosis.
DTC Confirmation Procedure
EBS00MGE
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-403, "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 is in neutral position.
(Forward direction)
OFF
Steering wheel is 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
EC-402
DTC P0550 PSP SENSOR
Wiring Diagram
EBS00MGF
TBWM0160E
DTC P0550 PSP SENSOR
EC-403
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EC
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
EBS00MGG
1.
RETIGHTEN GROUND SCREWS
1.
Turn ignition switch “OFF”.
2.
Loosen and retighten engine ground screws.
>> GO TO 2.
2.
CHECK PSP SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect PSP sensor harness connector.
2.
Turn ignition switch “ON”.
3.
Check voltage between PSP sensor terminal 1 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
89
B
Sensor ground
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 0V
103
L
Sensor power supply
[Ignition switch “ON”]
Approximately 5V
118
R
Power steering pressure
sensor
[Engine is running]
●
Steering wheel is being turned.
0.5 - 4.0V
[Engine is running]
●
Steering wheel is not being turned.
0.4 - 0.8V
PBIB0011E
PBIB0027E
Voltage: Approximately 5V
PBIB0188E
EC-404
DTC P0550 PSP SENSOR
3.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F5, E315
●
Harness for open or short between ECM and power steering pressure sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK PSP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch “OFF”.
2.
Check harness continuity between PSP sensor terminal 3 and ECM terminal 89.
Refer to Wiring Diagram.
3.
Also check harness for short to power.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F5, E315
●
Joint connector-30
●
Harness for open or short between power steering pressure sensor and ECM
>> Repair open circuit or short to power in harness or connectors.
6.
CHECK PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Check harness continuity between ECM terminal 118 and PSP sensor terminal 2.
Refer to Wiring Diagram.
3.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 7.
7.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F5, E315
●
Harness for open or short between ECM and power steering pressure sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.
CHECK PSP SENSOR
Refer to
EC-406, "Component Inspection"
OK or NG
OK
>> GO TO 9.
NG
>> Replace PSP sensor.
Continuity should exist.
Continuity should exist.
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