Nissan Pathfinder (2006 year). Instruction — part 201
DTC P0550 PSP SENSOR
EC-467
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EC
2006 Pathfinder
DTC P0550 PSP SENSOR
PFP:49763
Component Description
UBS00KB4
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
UBS00KB5
Specification data are reference values.
On Board Diagnosis Logic
UBS00KB6
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-479, "DTC P0643 SENSOR POWER SUPPLY"
DTC Confirmation Procedure
UBS00KB7
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-469, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
BBIA0552E
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 pres-
sure 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
EC-468
DTC P0550 PSP SENSOR
2006 Pathfinder
Wiring Diagram
UBS00KB8
BBWA1757E
DTC P0550 PSP SENSOR
EC-469
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2006 Pathfinder
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
UBS00KB9
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
P
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
Sensor ground
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 0V
68
G
Sensor power supply
(Power steering pressure
sensor)
[Ignition switch: ON]
Approximately 5V
BBIA0539E
EC-470
DTC P0550 PSP SENSOR
2006 Pathfinder
2.
CHECK PSP SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect power steering pressure (PSP) sensor harness con-
nector.
2.
Turn ignition switch ON.
3.
Check voltage between PSP sensor terminal 3 and ground with
CONSULT-II 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 PSP 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 1 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 PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check harness continuity between ECM terminal 12 and PSP sensor terminal 2.
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 PSP SENSOR
EC-471, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace PSP sensor.
BBIA0552E
Voltage: Approximately 5V
PBIB1872E
Continuity should exist.
Continuity should exist.
DTC P0550 PSP SENSOR
EC-471
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EC
2006 Pathfinder
6.
CHECK INTERMITTENT INCIDENT
Refer to
EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END
Component Inspection
UBS00KBA
POWER STEERING PRESSURE SENSOR
1.
Reconnect all harness connectors disconnected.
2.
Start engine and let it idle.
3.
Check voltage between ECM terminal 12 and ground under the
following conditions.
Removal and Installation
UBS00KBB
POWER STEERING PRESSURE SENSOR
Refer to
Condition
Voltage
Steering wheel: being turned
0.5 - 4.5V
Steering wheel: not being turned
0.4 - 0.8V
MBIB0126E
EC-472
DTC P0603 ECM POWER SUPPLY
2006 Pathfinder
DTC P0603 ECM POWER SUPPLY
PFP:23710
Component Description
UBS00KBO
Battery voltage is supplied to the ECM even when the ignition switch
is turned OFF for the ECM memory function of the DTC memory, the
air-fuel ratio feedback compensation value memory, the idle air vol-
ume learning value memory, etc.
On Board Diagnosis Logic
UBS00KBP
DTC Confirmation Procedure
UBS00KBQ
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 and wait at least 1 second.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and let it idle for 1 second.
4.
Turn ignition switch OFF, wait at least 10 seconds, and then turn
ON.
5.
Repeat steps 3 and 4 for 4 times.
6.
If 1st trip DTC is detected, go to
EC-474, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
PBIB1164E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0603
0603
ECM power supply cir-
cuit
ECM back-up RAM system does not function
properly.
●
Harness or connectors
[ECM power supply (back-up) circuit is
open or shorted.]
●
ECM
SEF058Y
DTC P0603 ECM POWER SUPPLY
EC-473
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2006 Pathfinder
Wiring Diagram
UBS00KBR
BBWA1758E
EC-474
DTC P0603 ECM POWER SUPPLY
2006 Pathfinder
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
UBS00KBS
1.
CHECK ECM POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check voltage between ECM terminal 121 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
2.
DETECT MALFUNCTIONING PART
Check the following.
●
20A fuse
●
IPDM E/R harness connector E121
●
Harness for open or short between ECM and battery
>> Repair open circuit in harness or connectors.
3.
CHECK INTERMITTENT INCIDENT
EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace harness or connectors.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
121
R/B
Power supply for ECM
(Back-up)
[Ignition switch: OFF]
BATTERY VOLTAGE
(11 - 14V)
Voltage: Battery voltage
MBIB0026E
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