NISSAN X-TRAIL 2003 Electronic Repair Manual

DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
EC-537
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DTC Confirmation ProcedureEBS00BIT
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 2 seconds.
2. Select "DATA MONITOR" mode with CONSULT-II.
3. Start engine and let it idle for 5 seconds.
4. If 1st trip DTC is detected, go toEC-539, "
Diagnostic Procedure"
.
WITHOUT CONSULT-II
1. Turn ignition switch "ON" and wait at least 2 seconds.
2. Start engine and let it idle for 5 seconds.
3. Turn ignition switch "OFF", wait at least 10 seconds and then turn "ON".
4. Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
5. If 1st trip DTC is detected, go toEC-539, "
Diagnostic Procedure".
SEF058Y

EC-538
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DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
Wiring Diagram
EBS00BIU
TBWA0092E

DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
EC-539
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Diagnostic ProcedureEBS00BIV
1.RETIGHTEN GROUND SCREWS
1. Turn ignition switch "OFF".
2. Loosen and retighten engine ground screws.
>> GO TO 2.
2.CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect electric throttle control actuator harness connector.
3. Disconnect ECM harness connector.
4. Check harness continuity between the following terminals.
Refer to Wiring Diagram.
5. Also check harness for short to ground and short to power.
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 THROTTLE CONTROL MOTOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch "OFF".
2. Check harness continuity between ECM terminal 115 and engine ground.
Refer to Wiring Diagram.
3. Also check harness for short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to power in harness or connectors.
PBIB0494E
Electric throttle control
actuator terminalECM terminal Continuity
6114 Should exist
116 Should not exist
3114 Should not exist
116 Should exist
PBIB0497E
Continuity should exist.

EC-540
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DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
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-540, "
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 engine 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-453, "
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-396, "
Throttle Valve Closed Position Learning".
3. PerformEC-396, "
Idle Air Volume Learning".
>>INSPECTION END
Component InspectionEBS00BIW
THROTTLE CONTROL MOTOR
1. Disconnect electric throttle control actuator harness connector F19.
PBIB0518E
Continuity should exist.

DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
EC-541
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2. Check resistance between terminals 3 and 6.
3. If NG, replace electric throttle control actuator and go to next
step.
4. PerformEC-396, "
Throttle Valve Closed Position Learning".
5. PerformEC-396, "
Idle Air Volume Learning". Resistance: Approximately 1 - 15W[at 25°C(77°F)]
PBIB0095E

EC-542
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DTC P1123 THROTTLE CONTROL MOTOR RELAY
DTC P1123 THROTTLE CONTROL MOTOR RELAY
PFP:16119
Component DescriptionEBS00BIX
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 ModeEBS00BIY
Specification data are reference values.
ECM Terminals and Reference ValueEBS00BIZ
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 LogicEBS00BJ0
FAIL -S AFE M OD E
ECM enters fail-safe mode when the malfunction A is detected.
DTC Confirmation ProcedureEBS00BJ1
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.

DTC P1123 THROTTLE CONTROL MOTOR RELAY
EC-543
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2. Select “DATA MONITOR” mode with CONSULT-II.
3. If 1st trip DTC is detected, go toEC-545, "
Diagnostic Procedure"
.
WITHOUT CONSULT-II
1. Turn ignition switch "ON" and wait at least 1 second.
2. Turn ignition switch "OFF", wait at least 10 seconds and then turn "ON".
3. Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
4. If 1st trip DTC is detected, go toEC-545, "
Diagnostic Procedure".
SEF058Y

EC-544
[QR (WITHOUT EURO-OBD)]
DTC P1123 THROTTLE CONTROL MOTOR RELAY
Wiring Diagram
EBS00BJ2
TBWA0093E

DTC P1123 THROTTLE CONTROL MOTOR RELAY
EC-545
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Diagnostic ProcedureEBS00BJ3
1.CHECKTHROTTLECONTROLMOTORRELAYPOWERSUPPLY
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.

EC-546
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DTC P1123 THROTTLE CONTROL MOTOR RELAY
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-546, "
Component Inspection".
OK or NG
OK >> GO TO 8.
NG >> Replace throttle control motor relay.
8.CHECK INTERMITTENT INCIDENT
Refer toEC-453, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT".
>>INSPECTION END
Component InspectionEBS00BJ4
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