2003 NISSAN X-TRAIL power steering

TROUBLE DIAGNOSIS
EC-85
[QR (WITH EURO-OBD)]
C
D
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EC

1 - 6: The numbers refer to the order of inspection.
(continued on next page)Throttle position sensor circuit 12 22222 2EC-168
,
EC-229
,
EC-364
,
EC-366
,
EC-401
Accelerator pedal position sensor circuit 3212 2EC-
368,EC-
386 , EC-
393 , EC-
409
Heated oxygen sensor 1 circuit1232 22 2EC-176
,
EC-183
,
EC-193
,
EC-318
,
EC-324
Knock sensor circuit 2 2 3EC-242
Crankshaft position sensor (POS) circuit 2 2EC-247
Camshaft position sensor (PHASE) circuit 2 2EC-254
Vehicle speed signal circuit 2 3 3 3EC-272
Power steering pressure sensor circuit 2 3 3 3 3EC-274
ECM 22333333333EC-279,
EC-282
Intake valve timing control solenoid valve cir-
cuit332 13223 3EC-286
PNP switch circuit 3 33333 3EC-373
Refrigerant pressure sensor circuit 2 3 3 3 3 4EC-451
Electrical load signal circuit 3 3 3 3EC-456
Air conditioner circuit223333333 3 2AT C - 3 4,
MTC-3
ESP/TCS/ABS CONTROL UNIT
(models with ESP)
ABS actuator and electric unit (control unit)
(models without ESP)4BRC-11
,
BRC-58
SYMPTOM
Reference
page
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
BATTERY DEAD (UNDER CHARGE)
Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA

EC-96
[QR (WITH EURO-OBD)]
TROUBLE DIAGNOSIS

2PU/RHeated oxygen sensor 2
heater[Engine is running]

Engine speed is below 3,600 rpm after the fol-
lowing conditions are met
–Warm-up condition
–Keeping the engine speed between 3,500
and 4,000 rpm for 1 minute and at idle for 1
minute under no load0 - 1.0V
[Ignition switch: ON]

Engine stopped
[Engine is running]

Engine speed is above 3,600 rpmBATTERY VOLTAGE
(11 - 14V)
3W/BThrottle control motor
relay power supply[Ignition switch: ON]BATTERY VOLTAGE
(11 - 14V)
4GThrottle control motor
(Close)[Ignition switch: ON]

Engine stopped

Shift lever: D (A/T), 1st (M/T)

Accelerator pedal: Released0 - 14V
5RThrottle control motor
(Open)[Ignition switch: ON]

Engine stopped

Shift lever: D (A/T), 1st (M/T)

Accelerator pedal: Fully depressed0 - 14V
6YVIAS control solenoid
valve[Engine is running]

Idle speedBATTERY VOLTAGE
(11 - 14V)
[Engine is running]

Engine speed is above 5,000 rpm0 - 1.0V
12 PPower steering pressure
sensor[Engine is running]

Steering wheel is being turned0.5 - 4.0V
[Engine is running]

Steering wheel is not being turned0.4 - 0.8V TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
PBIB1104E
PBIB1105E

TROUBLE DIAGNOSIS
EC-99
[QR (WITH EURO-OBD)]
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EC
35 P/L Heated oxygen sensor 1[Engine is running]
Warm-up condition

Engine speed is 2,000 rpm0 - Approximately 1.0V
(Periodically change)
46 RSensor power supply
(Refrigerant pressure sen-
sor)[Ignition switch: ON]Approximately 5V
47 RSensor power supply
(Throttle position sensor)[Ignition switch: ON]Approximately 5V
49 W Throttle position sensor 1[Ignition switch: ON]

Engine stopped

Shift lever: D (A/T), 1st (M/T)

Accelerator pedal: Fully releasedMore than 0.36V
[Ignition switch: ON]

Engine stopped

Shift lever: D (A/T), 1st (M/T)

Accelerator pedal: Fully depressedLess than 4.75V
50 OR Mass air flow sensor[Engine is running]

Warm-up condition

Idle speed0.7 - 1.1V (QR20DE)
0.8 - 1.2V (QR25DE)
[Engine is running]

Warm-up condition

Engine speed is 2,500 rpm1.4 - 1.9V (QR20DE)
1.6 - 1.9V (QR25DE)
54 —Sensor ground
(Knock sensor)[Engine is running]

Warm-up condition

Idle speedApproximately 0V
57 BSensor ground
(Intake air temperature
sensor/ Power steering
pressure sensor/ Refriger-
ant pressure sensor)[Engine is running]

Warm-up condition

Idle speedApproximately 0V
60
61
79
80L/R
BR
GY/R
PUIgnition signal No. 3
Ignition signal No. 1
Ignition signal No. 4
Ignition signal No. 2[Engine is running]

Warm-up condition

Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle0 - 0.1V
[Engine is running]

Warm-up condition

Engine speed is 2,000 rpm0 - 0.2V TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
PBIB0521E
PBIB0522E

EC-100
[QR (WITH EURO-OBD)]
TROUBLE DIAGNOSIS

62 YIntake valve timing
control solenoid valve[Engine is running]

Warm-up condition

Idle speedBATTERY VOLTAGE
(11 - 14V)
[Engine is running]

Warm-up condition

Engine speed is 2,000 rpmApproximately 4V - BATTERY
VOLTAGE (11 - 14V)
65 RSensor power supply
(Power steering pressure
sensor)[Ignition switch: ON]Approximately 5V
66 BSensor ground
(Throttle position sensor)[Engine is running]

Warm-up condition

Idle speedApproximately 0V
67 B/PSensor ground
(Mass air flow sensor)[Engine is running]

Warm-up condition

Idle speedApproximately 0V
68 R Throttle position sensor 2[Ignition switch: ON]

Engine stopped

Shift lever: D (A/T), 1st (M/T)

Accelerator pedal: Fully releasedLess than 4.75V
[Ignition switch: ON]

Engine stopped

Shift lever: D (A/T), 1st (M/T)

Accelerator pedal: Fully depressedMore than 0.36V
69 YRefrigerant pressure sen-
sor[Engine is running]

Warm-up condition

Both A/C switch and blower switch: ON
(Compressor operates)1.0 - 4.0V
72 BR/YEngine coolant tempera-
ture sensor[Engine is running]Approximately 0 - 4.8V
Output voltage varies with
engine coolant temperature.
73 BSensor ground
(Engine coolant tempera-
ture sensor)[Engine is running]

Warm-up condition

Idle speedApproximately 0V
74 BSensor ground
(Heated oxygen sensor)[Engine is running]

Warm-up condition

Idle speedApproximately 0V
82 RYSensor ground
(Accelerator pedal position
sensor 1)[Engine is running]

Warm-up condition

Idle speedApproximately 0V
83 LSensor ground
(Accelerator pedal position
sensor 2)[Engine is running]

Warm-up condition

Idle speedApproximately 0V TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
PBIB1790E

TROUBLE DIAGNOSIS
EC-103
[QR (WITH EURO-OBD)]
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EC
*: The following emission-related diagnostic information is cleared when the ECM memory is erased.

Diagnostic trouble codes

1st trip diagnostic trouble codes

Freeze frame data

1st trip freeze frame data

System readiness test (SRT) codes

Test values
ENGINE CONTROL COMPONENT PARTS/CONTROL SYSTEMS APPLICATION
DTC & SRT confirmation The status of system monitoring tests and the self-diagnosis status/result can be confirmed.
ECM part number ECM part number can be read.Diagnostic test mode Function
ItemDIAGNOSTIC TEST MODE
WORK
SUP-
PORTSELF-DIAGNOS-
TIC RESULTS
DATA
MONI-
TORDATA
MONI-
TOR
(SPEC)ACTIV
E TESTDTC & SRT
CONFIRMATION
DTC*1FREEZ
E
FRAME
DATA*
2
SRT
STA-
TUSDTC
WORK
SUP-
PORT
ENGINE CONTROL COMPONENT PARTS
INPUT
Crankshaft position sensor (POS)××××
Camshaft position sensor (PHASE)×××
Mass air flow sensor×××
Engine coolant temperature sensor×××××
Heated oxygen sensor 1×××××
Heated oxygen sensor 2×××××
Vehicle speed signal××××
Accelerator pedal position sensor×××
Throttle position sensor×××
Intake air temperature sensor××××
Knock sensor×
Refrigerant pressure sensor××
Closed throttle position switch (accelera-
tor pedal position sensor signal)××
Air conditioner switch××
Park/neutral position (PNP) switch×××
Stop lamp switch×××
Power steering pressure sensor×××
Battery voltage××
Electrical load signal××

TROUBLE DIAGNOSIS
EC-107
[QR (WITH EURO-OBD)]
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EC

HO2S1 MNTR (B1)
[RICH/LEAN]××

Display of heated oxygen sensor 1 signal dur-
ing air-fuel ratio feedback control:
RICH: means the mixture became “rich”, and
control is being affected toward a leaner mix-
ture.
LEAN: means the mixture became “lean”, and
control is being affected toward a rich mixture.
After turning ON the ignition
switch, “RICH” is displayed until
air-fuel mixture ratio feedback
control begins.

When the air-fuel ratio feedback is
clamped, the value just before the
clamping is displayed continu-
ously.
HO2S2 MNTR (B1)
[RICH/LEAN]×

Display of heated oxygen sensor 2 signal:
RICH: means the amount of oxygen after three
way catalyst is relatively small.
LEAN: means the amount of oxygen after
three way catalyst is relatively large.

When the engine is stopped, a
certain value is indicated.
VHCL SPEED SE
[km/h] or [mph]××

The vehicle speed computed from the vehicle
speed signal is displayed.
BATTERY VOLT
[V]××

The power supply voltage of ECM is dis-
played.
ACCEL SEN 1 [V]××

The accelerator pedal position sensor signal
voltage is displayed.
ACCEL SEN 2 signal is converted
by ECM internally. Thus, it differs
from ECM terminal voltage signal. ACCEL SEN 2 [V]×
THRTL SEN 1 [V]××

The throttle position sensor signal voltage is
displayed.
THRTL SEN 2 signal is converted
by ECM internally. Thus, it differs
from ECM terminal voltage signal. THRTL SEN 2 [V]×
INT/A TEMP SE
[°C] or [°F]××

The intake air temperature (determined by the
signal voltage of the intake air temperature
sensor) is indicated.
START SIGNAL
[ON/OFF]××

Indicates start signal status [ON/OFF] com-
puted by the ECM according to the signals of
engine speed and battery voltage.
After starting the engine, [OFF] is
displayed regardless of the starter
signal.
CLSD THL POS
[ON/OFF]××

Indicates idle position [ON/OFF] computed by
the ECM according to the accelerator pedal
position sensor signal.
AIR COND SIG
[ON/OFF]××

Indicates [ON/OFF] condition of the air condi-
tioner switch as determined by the air condi-
tioner signal.
P/N POSI SW
[ON/OFF]××

Indicates [ON/OFF] condition from the park/
neutral position (PNP) switch signal.
PW/ST SIGNAL
[ON/OFF]××

[ON/OFF] condition of the power steering
pressure sensor as determined by the power
steering pressure sensor is indicated.
LOAD SIGNAL
[ON/OFF]××

Indicates [ON/OFF] condition from the electri-
cal load signal.
ON: Rear window defogger switch is ON and/
or lighting switch is in 2nd position.
OFF: Both rear window defogger switch and
lighting switch are OFF.
IGNITION SW
[ON/OFF]×

Indicates [ON/OFF] condition from ignition
switch.
HEATER FAN SW
[ON/OFF]×

Indicates [ON/OFF] condition from the heater
fan switch signal.
BRAKE SW
[ON/OFF]×

Indicates [ON/OFF] condition from the stop
lamp switch signal. Monitored item
[Unit]ECM
INPUT
SIGNALSMAIN
SIG-
NALSDescription Remarks

EC-274
[QR (WITH EURO-OBD)]
DTC P0550 PSP SENSOR

DTC P0550 PSP SENSORPFP:49763
Component DescriptionEBS010QP
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 ModeEBS010QQ
Specification data are reference values.
On Board Diagnosis LogicEBS010QR
The MI will not light up for this self-diagnosis.
NOTE:
If DTC P0550 is displayed with DTC P1229, first perform the trouble diagnosis for DTC P1229. Refer to
EC-368
.
DTC Confirmation ProcedureEBS010QS
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-276, "
Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
PBIB0502E
MONITOR ITEM CONDITION SPECIFICATION
PW/ST SIGNAL

Engine: After warming up, idle
the engineSteering wheel is in neutral position.
(Forward direction)OFF
Steering wheel is turned. ON
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0550
0550Power steering pressure
sensor circuitAn 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-276
[QR (WITH EURO-OBD)]
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 ProcedureEBS010QU
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground three screws on the body.
Refer to EC-131, "
Ground Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
12 PPower steering pressure
sensor[Engine is running]

Steering wheel is being turned0.5 - 4.0V
[Engine is running]

Steering wheel is not being turned0.4 - 0.8V
57 BSensor ground
(Intake air temperature
sensor/ Power steering
pressure sensor/ Refriger-
ant pressure sensor)[Engine is running]

Warm-up condition

Idle speedApproximately 0V
65 RSensor power supply
(Power steering pressure
sensor)[Ignition switch: ON]Approximately 5V
PBIB2021E