power steering NISSAN X-TRAIL 2003 Electronic Owner's Guide

TROUBLE DIAGNOSIS
EC-439
[QR (WITHOUT EURO-OBD)]
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EC
CLSD THL POS
[ON/OFF]´´lIndicates idle position [ON/OFF] com-
puted by ECM according to the acceler-
ator pedal position sensor signal.
AIR COND SIG
[ON/OFF]´´
lIndicates [ON/OFF] condition of the air
conditioner switch as determined by the
air conditioner signal.
P/N POSI SW
[ON/OFF]´´
lIndicates [ON/OFF] condition from the
park/neutral position (PNP) switch sig-
nal.
PW/ST SIGNAL
[ON/OFF]´´
l[ON/OFF] condition of the power steer-
ing system (determined by the signal
voltage of the power steering pressure
sensor signal) is indicated.
LOAD SIGNAL
[ON/OFF]´´
lIndicates [ON/OFF] condition from the
electrical load signal.
ON ... Rear window defogger switch is
ON and/or lighting switch is in 2nd posi-
tion.
OFF ... Both rear window defogger
switch and lighting switch are OFF.
IGNITION SW
[ON/OFF]´´
lIndicates [ON/OFF] condition from igni-
tion switch.
HEATER FAN SW
[ON/OFF]´
lIndicates [ON/OFF] condition from the
heater fan switch signal.
BRAKE SW
[ON/OFF]´
lIndicates [ON/OFF] condition from the
stop lamp switch signal.
INJ PULSE-B1
[msec]´
lIndicates the actual fuel injection pulse
width compensated by ECM according
to the input signals.lWhen the engine is stopped, a
certain computed value is indi-
cated.
B/FUEL SCHDL
[msec]´
l“Base fuel schedule” indicates the fuel
injection pulse width programmed into
ECM, prior to any learned on board cor-
rection.
IGN TIMING
[BTDC]´
lIndicates the ignition timing computed
by ECM according to the input signals.lWhen the engine is stopped, a
certain value is indicated.
A/F ALPHA-B1 [%]´
lThe mean value of the air-fuel ratio
feedback correction factor per cycle is
indicated.
lWhen the engine is stopped, a
certain value is indicated.
lThis data also includes the data
for the air-fuel ratio learning con-
trol.
CAL/LD VALUE [%]
l“Calculated load value” indicates the
value of the current airflow divided by
peak airflow.
MASS AIRFLOW
[g·m/s]
lIndicates the mass airflow computed by
ECM according to the signal voltage of
the mass air flow sensor. Monitored item
[Unit]ECM
INPUT
SIG-
NALSMAIN
SIG-
NALSCAN
DIAG
SUP-
PORT
MNTRDescription Remarks

EC-476
[QR (WITHOUT EURO-OBD)]
DTC P0120 TP SENSOR
On Board Diagnosis Logic
EBS00BGK
FAIL -S AFE M OD E
ECM enters in fail-safe mode when the malfunction A, B, C or D is detected.
*: The ECM enters in the fail-safe mode when the normal signal is entered to the ECM after the malfunction C was detected.
DTC Confirmation ProcedureEBS00BGL
NOTE:
lPerform “PROCEDURE FOR MALFUNCTION A, B, C AND D” first. If the 1st trip DTC cannot be con-
firmed, perform “PROCEDURE FOR MALFUNCTION E". If the 1st trip DTC cannot be confirmed,
perform “PROCEDURE FOR MALFUNCTION F".
lIf “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF” and
wait at least 10 seconds before conducting the next test.
74 GThrottle position sen-
sor 2[Ignition switch "ON"]
lGear position is "D" (A/T model)
lGear position is "1st" (M/T model)
lAccelerator pedal fully releasedLess than 4.75V
[Ignition switch “ON”]
lGear position is "D" (A/T model)
lGear position is "1st" (M/T model)
lAccelerator pedal fully depressedMore than 0.36V TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0120
0120Throttle position sensor
circuitA)An excessively low or high voltage from
the throttle position sensor 1 is sent to
ECM.
lHarness or connectors
(The throttle position sensor 1 or 2 circuit
is open or shorted.)
lElectric throttle control actuator B)An excessively low or high voltage from
the throttle position sensor 2 is sent to
ECM.
C)A difference between signals from sensor
1 and sensor 2 is out of the specified
range.
D)ECM detects a voltage of power source
for sensor is excessively low or high.
lHarness or connectors
(The throttle position sensor 1, 2, accel-
erator pedal position sensor 1, 2, mass
air flow sensor, power steering pressure
sensor or refrigerant pressure sensor cir-
cuit is shorted.)
lECM
(ECM pin terminal is bend or break.)
E)Closed throttle position learning value is
excessively low.
lElectric throttle control actuator
F)Closed throttle position learning is not
performed successfully, repeatedly.
Detected items Engine operation condition in fail-safe mode
Malfunction A The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle
position to be within +10 degrees.
The ECM regulates an opening speed of approx. 5 seconds to an opening of 10 degrees.
So, the acceleration will be poor. Malfunction B
Malfunction C*
Malfunction DECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx.
5 degrees) by the return spring.

EC-480
[QR (WITHOUT EURO-OBD)]
DTC P0120 TP SENSOR
Diagnostic Procedure
EBS00BGN
MALFUNCTIONING A, B, C, AND D
1.RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
>> GO TO 2.
2.CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT
1. Disconnect electric throttle control actuator harness connector.
2. Turn ignition switch “ON”.
3. Check voltage between electric throttle control actuator terminal
1 and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
lHarness for short between ECM and electric throttle control actuator
lHarness for short between ECM and accelerator pedal position sensor
lHarness for short between ECM and mass air flow sensor
lHarness for short between ECM and power steering pressure sensor
lHarness for short between ECM and refrigerant pressure sensor
lECM pin terminal
>> Repair short to ground or short to power in harness or connectors.
PBIB0494E
PBIB0497E
Voltage: Approximately 5V
PBIB0082E

EC-518
[QR (WITHOUT EURO-OBD)]
DTC P0550 PSP SENSOR
DTC P0550 PSP SENSOR
PFP:49763
Component DescriptionEBS00BI5
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 ModeEBS00BI6
Specification data are reference values.
ECM Terminals and Reference ValueEBS00BI7
Specification data are reference values and are measured between each terminal and body 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.
On Board Diagnosis LogicEBS00BI8
DTC Confirmation ProcedureEBS00BI9
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.
PBIB0502E
MONITOR ITEM CONDITION SPECIFICATION
PW/ST SIGNAL
lEngine: After warming up, idle
the engineSteering wheel is in neutral position.
(Forward direction)OFF
Steering wheel is turned. ON
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
58 B Sensors' ground[Engine is running]
lWarm-up condition
lIdle speedApproximately 0V
65 R Sensor's power supply[Ignition switch “ON”]Approximately 5V
67 PPower steering pres-
sure sensor[Engine is running]
lSteering wheel is being turned.0.5 - 4.0V
[Engine is running]
lSteering wheel is not being turned.0.4 - 0.8V
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0550
0550Power steering pres-
sure sensor circuitAn excessively low or high voltage from the
sensor is sent to ECM.
lHarness or connectors
(The sensor circuit is open or shorted)
lPower steering pressure sensor

EC-522
[QR (WITHOUT EURO-OBD)]
DTC P0550 PSP SENSOR
4.CHECK PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 67 and PSP sensor terminal 2.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> Repair harness or connectors.
5.CHECK PSP SENSOR
Refer toEC-522, "
Component Inspection".
OK or NG
OK >> GO TO 6.
NG >> Replace PSP sensor.
6.CHECK INTERMITTENT INCIDENT
Refer toEC-453, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT".
>>INSPECTION END
Component InspectionEBS00BIC
POWER STEERING PRESSURE SENSOR
1. Reconnect all harness connectors disconnected.
2. Start engine and let it idle.
3. Check voltage between ECM terminal 67 and ground under the
following conditions.Continuity should exist.
Condition Voltage
Steering wheel is being turned fully. Approximately 3.6V
Steering wheel is not being turned. Approximately 0.6V
PBIB0570E

EC-660
[YD]
ENGINE CONTROL SYSTEM
System Chart
EBS0037B
Fuel Injection Control SystemEBS0036G
SYSTEM DESCRIPTION
Three types of fuel injection control are provided to accommodate engine operating conditions; normal control,
idle control and start control. The ECM determines the appropriate fuel injection control. Under each control,
the amount of fuel injected is adjusted to improve engine performance.
Pulse signals are exchanged between ECM and Electronic Drive Unit (EDU). EDU controls fuel injectors
according to the input signals to adjust the amount of fuel injected to the preset value.
START CONTROL
Input/Output Signal Chart
When the ECM receives a start signal from the ignition switch, the
ECM adapts the fuel injection system for the start control. The
amount of fuel injected at engine starting is a preset program value
in the ECM. The program is determined by the engine speed, engine
coolant temperature and common rail fuel pressure.
For better startability under cool engine conditions, the lower the
coolant temperature becomes, the greater the amount of fuel
injected. The ECM ends the start control when the engine speed
reaches the specific value, and shifts the control to the normal or idle
control.
Input (Sensor) ECM Function Output (Actuator)
lAccelerator pedal position sensor
lAccelerator pedal released position switch
lCommon rail fuel pressure sensor
lFuel temperature sensor
lEngine coolant temperature sensor
lCrankshaft position sensor (TDC)
lCamshaft position sensor
lVehicle speed sensor
lIgnition switch
lStop Lamp switch
lAir conditioner switch
lMass air flow sensor
lPark/neutral position switch
lBattery voltage
lPower steering oil pressure switchFuel injection controlEDU, Fuel injectors and Suction control
valve
Fuel injection timing controlEDU, Fuel injectors and Suction control
valve
Fuel cut controlEDU, Fuel injectors and Suction control
valve
Glow control system Glow relay & glow indictor lamp
On board diagnostic system Malfunction indicator (MI)
EGR volume control EGR volume control valve
Cooling fan control Cooling fan relay
Air conditioning cut control Air conditioner relay
Sensor Input Signal to ECM ECM Function Actuator
Engine coolant temperature sensor Engine coolant temperature
Fuel injection
control (start
control)EDU
Fuel injectors
Suction control valve Crankshaft position sensor (TDC) Engine speed
Camshaft position sensor Piston position
Ignition switch Start signal
Common rail fuel pressure sensor Common rail fuel pressure
SEF648S

TROUBLE DIAGNOSIS
EC-691
[YD]
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: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
CONSULT-II FunctionEBS0037H
CONSULT-II INSPECTION PROCEDURE
1. Turn ignition switch OFF.
2. Connect CONSULT-II to data link connector, which is located
under the driver side dash panel.
E12 P/BPower steering oil pres-
sure switch[Engine is running]lSteering wheel is being turnedApproximately 0V
[Engine is running]
lSteering wheel is not being turnedBATTERY VOLTAGE
(11 - 14V)
E13 G/ORPark/Neutral position
switch[Ignition switch “ON”]
lGear position is "Neutral"Approximately 0V
[Ignition switch “ON”]
lExcept the above gear positionBATTERY VOLTAGE
(11 - 14V)
E16 G/W Suction control valve 2[Engine is running]
lWarm-up condition
lIdle speed0-12.5V
[Engine is running]
lWarm-up condition
lEngine speed is 2,000 rpm0-12.5V
E21 L/B Vehicle speed sensor[Engine is running]
lLift up the vehicle
lIn 2nd gear position
lVehicle speed is 30 km/h (19 MPH)0-5V TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
PBIB0401E
PBIB0402E
PBIB0386E
PBIB0376E

EC-692
[YD]
TROUBLE DIAGNOSIS
3. Turn ignition switch ON.
4. Touch “START”.
5. Touch “ENGINE”.
6. Perform each diagnostic test mode according to each service
procedure.
For further information, see the CONSULT-II Operation Manual.
ENGINE CONTROL COMPONENT PARTS/CONTROL SYSTEMS APPLICATION
X: Applicable
SEF995X
PBIB0410E
ItemDIAGNOSTIC TEST MODE
SELF-DIAG
RESULTSDATA MONI-
TO RACTIVE
TEST
ENGINE CONTROL COMPONENT PARTS
INPUTCrankshaft position sensor (TDC)´´
Camshaft position sensor´
Engine coolant temperature sensor´´
Vehicle speed sensor´´
Fuel temperature sensor´´
Accelerator pedal position sensor 1´´
Accelerator pedal position sensor 2´´
Accelerator pedal released position switch´´
Common rail fuel pressure sensor´´
Park/neutral position (PNP) switch´
Mass air flow sensor´´
Battery voltage´´
Power steering oil pressure switch´
Stop lamp switch´
Absolute pressure sensor´´
Fuel injector adjustment resistor´
OUTPUTSuction control valve´´´
Fuel injector´´´
Glow relay´´
Cooling fan relay´´´
EGR volume control valve´´

TROUBLE DIAGNOSIS
EC-693
[YD]
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SELF-DIAGNOSTIC MODE
Regarding items detected in “SELF-DIAG RESULTS” mode, refer to —EC-654, "INDEX FOR DTC".
DATA MONITOR MODE
MONITOR ITEMECM
input
signalMain
signalsCONDITION SPECIFICATION
CKPS ·RPM (TDC) [rpm]´´
lThe engine speed computed from
the crankshaft position sensor (TDC)
signal is displayed.
COOLAN TEMP/S
[°C] or [°F]´´
lThe engine coolant temperature
(determined by the signal voltage of
the engine coolant temperature sen-
sor) is displayed.When the engine coolant temperature
circuit is open or short, ECM enters fail-
safe mode. The engine coolant temper-
ature determined by the ECM is dis-
played.
VHCL SPEED SE
[km/h] or [mph]´´
lThe vehicle speed computed form
the vehicle speed sensor signal is
displayed.
FUEL TEMP SEN [°C] or [°F]´´
lThe fuel temperature (determined by
the signal voltage of the fuel temper-
ature sensor) is displayed.
ACCEL POS SEN [V]´´
lThe accelerator pedal position sen-
sor 1 signal voltage is displayed.
ACCEL SEN 2 [V]´´
lThe accelerator pedal position sen-
sor 2 signal voltage is displayed.
OFF ACCEL SW [ON/OFF]´´
lindicates [ON/OFF] condition from
the accelerator pedal released posi-
tion switch signal.
ACT CR PRESS [MPa]´´
lThe common rail fuel pressure
(determined by the signal voltage of
the common rail fuel pressure sen-
sor) is displayed.
BATTERY VOLT [V]´´
lThe power supply voltage of ECM is
displayed.
P/N POSI SW [ON/OFF]´´
lIndicates [ON/OFF] condition from
the park/neutral position switch sig-
nal.
START SIGNAL [ON/OFF]´´
lindicates [ON/OFF] condition from
the starter signal.
PW/ST SIGNAL [ON/OFF]´
lindicates [ON/OFF] condition from
the power steering oil pressure
switch signal.
BRAKE SW [ON/OFF]´´
lindicates [ON/OFF] condition from
thestoplampswitchsignal.
IGN SW [ON/OFF]´´
lIndicates [ON/OFF] condition from
ignition switch signal.
MAS AIR/FL SE [V]´´
lThe signal voltage of the mass air
flow sensor is displayed.
SUCTION CV [°CA]´
lIndicates [°CA] of suction control
valve operating angle.
MAIN INJ WID [msec]´
lIndicates the actual fuel injection
pulse width compensated by ECM
according to the input signals.
GLOW RLY [ON/OFF]´
lThe glow relay control condition
(determined by ECM according to
the input signal) is displayed.

EC-820
[YD]
POWER STEERING OIL PRESSURE SWITCH
POWER STEERING OIL PRESSURE SWITCH
PFP:49761
Component DescriptionEBS003PS
The power steering oil pressure switch is attached to the power
steering high-pressure tube and detects a power steering load.
When a power steering load is detected, it signals the ECM. The
ECM adjusts the fuel injector pulse width to increase the idle speed
and adjust for the increased load.
CONSULT-II Reference Value in Data Monitor ModeEBS003PT
Specification data are reference values.
ECM Terminals and Reference ValueEBS003PZ
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.
PBIB0375E
MONITOR ITEM CONDITION SPECIFICATION
PW/ST SIGNAL
lEngine: After warming up, idle the
engineSteering wheel is in neutral position.
(Forward direction)OFF
Steering wheel is turned. ON
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
E12 P/BPower steering oil pressure
switch[Engine is running]
lSteering wheel is being turnedApproximately 0V
[Engine is running]
lSteering wheel is not being turnedBATTERY VOLTAGE
(11 - 14V)