NISSAN X-TRAIL 2003 Electronic Repair Manual

DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
EC-277
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4.CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1. Remove the intake air duct.
2. Check if foreign matter is caught between the throttle valve and
the housing.
OK or NG
OK >> GO TO 5.
NG >> Remove the foreign matter and clean the electric throttle
control actuator inside.
5.CHECK THROTTLE CONTROL MOTOR
Refer toEC-277, "
Component Inspection".
OK or NG
OK >> GO TO 6.
NG >> GO TO 8.
6.CHECKTHROTTLECONTROLMOTORSHIELDCIRCUITFOROPENANDSHORT
1. Disconnect joint connector-4.
2. Check harness continuity between joint connector-4 terminal 1 and ground.
Refer to Wiring Diagram.
3. Also check harness for short to power.
OK or NG
OK >> GO TO 7.
NG >> Repair open circuit or short to power in harness or connectors.
7.CHECK INTERMITTENT INCIDENT
Refer toEC-107, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT".
OK or NG
OK >> GO TO 8.
NG >> Repair or replace harness or connectors.
8.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator.
2. PerformEC-31, "
Throttle Valve Closed Position Learning".
3. PerformEC-31, "
Idle Air Volume Learning".
>>INSPECTION END
Component InspectionEBS00B88
THROTTLE CONTROL MOTOR
1. Disconnect electric throttle control actuator harness connector F19.
PBIB0518E
Continuity should exist.

EC-278
[QR (WITH EURO-OBD)]
DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
2. Check resistance between terminals 3 and 6.
3. If NG, replace electric throttle control actuator and go to next
step.
4. PerformEC-31, "
Throttle Valve Closed Position Learning".
5. PerformEC-31, "
Idle Air Volume Learning". Resistance: Approximately 1 - 15W[at 25°C(77°F)]
PBIB0095E

DTC P1123 THROTTLE CONTROL MOTOR RELAY
EC-279
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DTC P1123 THROTTLE CONTROL MOTOR RELAYPFP:16119
Component DescriptionEBS00CZR
Power supply for the Throttle Control motor is provided to the ECM via throttle control motor relay. The throttle
control motor relay is ON/OFF controlled by the ECM. When the ignition switch is turned ON, the ECM sends
an ON signal to throttle control motor relay and battery voltage is provided to the ECM. When the ignition
switch is turned OFF, the ECM sends an OFF signal to throttle control motor relay and battery voltage is not
provided to the ECM.
CONSULT-II Reference Value in Data Monitor ModeEBS00CZS
Specification data are reference values.
ECM Terminals and Reference ValueEBS00CZT
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 LogicEBS00CZU
FAI L-S AFE MO DE
ECM enters fail-safe mode when the malfunction A is detected.
DTC Confirmation ProcedureEBS00CZV
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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10V at idle.
WITH CONSULT-II
1. Turn ignition switch “ON” and wait at least 1 second.
MONITOR ITEM CONDITION SPECIFICATION
THRTL RELAY
lIgnition switch: ON ON
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
11 2 W / RThrottle control motor
relay[Ignition switch "OFF"]BATTERY VOLTAGE
(11 - 14V)
[Ignition switch "ON"]0-1.0V
11 3 W / BThrottle control motor
relay power supply[Ignition switch "ON"]BATTERY VOLTAGE
(11 - 14V)
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1123
11 2 3Throttle control motor
relay circuitA)ECM detect the throttle control motor relay is
stuck ON.
lHarness or connectors
(Throttle control motor relay cir-
cuit is open or shorted.)
lThrottle control motor relay B)ECM detect the throttle control motor relay is
stuck OFF.
Detected items Engine operating condition in fail-safe mode
Malfunction AECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening
(approx. 5 degrees) by the return spring.

EC-280
[QR (WITH EURO-OBD)]
DTC P1123 THROTTLE CONTROL MOTOR RELAY
2. Select “DATA MONITOR” mode with CONSULT-II.
3. If 1st trip DTC is detected, go toEC-282, "
Diagnostic Procedure"
.
WITH GST
Follow the procedure “With CONSULT-II” above.
SEF058Y

DTC P1123 THROTTLE CONTROL MOTOR RELAY
EC-281
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EC
Wiring DiagramEBS00CZW
TBWA0093E

EC-282
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DTC P1123 THROTTLE CONTROL MOTOR RELAY
Diagnostic Procedure
EBS00CZX
1.CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY
1. Turn ignition switch “OFF”.
2. Disconnect throttle control motor relay harness connector.
3. Check voltage between throttle control motor relay terminals 2, 5
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.
l15A fuse
lHarness for open or short between throttle control motor relay and battery
>> Repair or replace harness or connectors.
3.CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check continuity between ECM terminal 113 and throttle control motor relay terminal 3.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
lHarness connectors E60, F36
lHarness for open or short between ECM and throttle control motor relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB0505E
Voltage: Battery voltage
PBIB0575E
Continuity should exist.

DTC P1123 THROTTLE CONTROL MOTOR RELAY
EC-283
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5.CHECK THROTTLE CONTROL MOTOR RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check continuity between ECM terminal 112 and throttle control motor relay terminal 1.
Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
lHarness connectors E60, F36
lHarness for open or short between ECM and throttle control motor relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
7.CHECK THROTTLE CONTROL MOTOR RELAY
Refer toEC-283, "
Component Inspection".
OK or NG
OK >> GO TO 8.
NG >> Replace throttle control motor relay.
8.CHECK INTERMITTENT INCIDENT
Refer toEC-107, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT".
>>INSPECTION END
Component InspectionEBS00CZY
THROTTLE CONTROL MOTOR RELAY
1. Apply 12V direct current between relay terminals 1 and 2.
2. Check continuity between relay terminals 3 and 5.
3. If NG, replace throttle control motor relay.Continuity should exist.
Conditions Continuity
12V direct current supply between terminals 1 and 2 Yes
No current supply No
PBIB0098E

EC-284
[QR (WITH EURO-OBD)]
DTC P1143 HO2S1
DTC P1143 HO2S1
PFP:22690
Component DescriptionEBS00BBD
The heated oxygen sensor 1 is placed into the front tube. It detects
the amount of oxygen in the exhaust gas compared to the outside
air. The heated oxygen sensor 1 has a closed-end tube made of
ceramic zirconia. The zirconia generates voltage from approximately
1V in richer conditions to 0V in leaner conditions. The heated oxygen
sensor 1 signal is sent to the ECM. The ECM adjusts the injection
pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel
ratio occurs near the radical change from 1V to 0V.
CONSULT-II Reference Value in Data Monitor ModeEBS00BBE
Specification data are reference values.
ECM Terminals and Reference ValueEBS00BBF
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.
SEF463R
SEF288D
MONITOR ITEM CONDITION SPECIFICATION
HO2S1 (B1)
lEngine: After warming upMaintaining engine speed at 2,000
rpm0 - 0.3V¨Approx. 0.6 - 1.0V
HO2S1 MNTR (B1)
lEngine: After warming upMaintaining engine speed at 2,000
rpmLEAN¨RICH
Changes more than 5 times dur-
ing 10 seconds.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
92 G/WHeated oxygen sen-
sor 1[Engine is running]
lWarm-up condition
lEngine speed is 2,000 rpm.0 - Approximately 1.0V (Periodi-
cally change)

DTC P1143 HO2S1
EC-285
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On Board Diagnosis LogicEBS00BBG
To judge the malfunction, the output from the heated oxygen sensor
1 is monitored to determine whether the “rich” output is sufficiently
high and whether the “lean” output is sufficiently low. When both the
outputs are shifting to the lean side, the malfunction will be detected.
DTC Confirmation ProcedureEBS00BBH
CAUTION:
Always drive vehicle at a safe speed.
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.
TESTING CONDITION:
lAlways perform at a temperature above-10°C(14°F).
lBefore performing following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Stop engine and wait at least 10 seconds.
3. Turn ignition switch “ON” and select “HO2S1 (B1) P1143" of “HO2S1” in “DTC WORK SUPPORT” mode
with CONSULT-II.
4. Touch “START”.
5. Start engine and let it idle for at least 3 minutes.
NOTE:
Never raise engine speed above 3,600 rpm after this step. If
the engine speed limit is exceeded, return to step 5.
SEF300U
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1143
11 4 3Heated oxygen sensor
1 lean shift monitoringThe maximum and minimum voltage from the
sensor are not reached to the specified volt-
ages.
lHeated oxygen sensor 1
lHeated oxygen sensor 1 heater
lFuel pressure
lInjectors
lIntake air leaks
PBIB0546E

EC-286
[QR (WITH EURO-OBD)]
DTC P1143 HO2S1
6. When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen. Maintain the conditions con-
tinuously until “TESTING” changes to “COMPLETED”. (It will
take approximately 50 seconds or more.)
If “TESTING” is not displayed after 5 minutes, retry from
step 2.
7. Make sure that “OK” is displayed after touching “SELF-DIAG
RESULTS”. If “NG” is displayed, refer toEC-286, "
Diagnostic
Procedure".
Overall Function CheckEBS00BBI
Use this procedure to check the overall function of the heated oxygen sensor 1 circuit. During this check, a 1st
trip DTC might not be confirmed.
WITH GST
1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes between ECM terminal 92 [HO2S1(B1) signal] and engine ground.
3. Check one of the following with engine speed held at 2,000 rpm
constant under no load.
–The maximum voltage is over 0.6V at least one time.
–The minimum voltage is over 0.1V at least one time.
4. If NG, go toEC-286, "
Diagnostic Procedure".
Diagnostic ProcedureEBS00BBJ
1.RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
>> GO TO 2.
ENG SPEED 1,400 - 3,200 rpm
Vehicle speed Less than 100 km/h (62 MPH)
B/FUEL SCHDL 2.9 - 14.5 msec
Selector lever Suitable position
PBIB0547E
SEC769C
PBIB0543E
PBIB0494E