NISSAN X-TRAIL 2001 Service Repair Manual

DTC P1229 SENSOR POWER SUPPLY
EC-621
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DTC P1229 SENSOR POWER SUPPLYPFP:16119
On Board Diagnosis LogicEBS00NIV
This self-diagnosis has the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MI lights up.
DTC Confirmation ProcedureEBS00NIW
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”.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and let it idle for 1 second.
4. If DTC is detected, go to EC-623, "
Diagnostic Procedure" .
WITHOUT CONSULT-II
1. Start engine and let it idle for 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 DTC is detected, go to EC-623, "
Diagnostic Procedure" .
DTC No.Trouble diagnosis
nameDTC detecting condition Possible cause
P1229
1229Sensor power supply
circuit shortECM detects a voltage of power source for
sensor is excessively low or high.
●Harness or connectors
(The TP sensor 1 and 2 circuit is shorted.)
(APP sensor 1 circuit is shorted.)
(MAF sensor circuit is shorted.)
(Refrigerant pressure sensor circuit is
shorted.)
●Electric throttle control actuator
(TP sensor 1 and 2)
●Accelerator pedal position sensor
(APP sensor 1)
●MAF sensor
●Refrigerant pressures sensor
●ECM pin terminal
Engine operation condition in fail-safe mode
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return
spring.
SEF058Y

EC-622
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DTC P1229 SENSOR POWER SUPPLY
Wiring Diagram
EBS00NIX
TBWA0183E

DTC P1229 SENSOR POWER SUPPLY
EC-623
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Diagnostic ProcedureEBS00NIY
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 5.
NG >> GO TO 3.
3.CHECK SENSOR POWER SUPPLY CIRCUITS FOR SHORT
Check the following.
●Harness for short to power and short to ground, between the following terminals.
●ECM pin terminal.
OK or NG
OK >> GO TO 4.
NG >> Repair short to ground or short to power in harness or connectors.
PBIB0925E
PBIB0497E
Voltage: Approximately 5V
PBIB0082E
ECM terminal Sensor terminals Reference Wiring Diagram
65Electric throttle control actuator terminal 1EC-588
APP sensor terminal 6EC-653
MAF sensor terminal 2EC-519
Refrigerant pressure sensor terminal 3EC-734

EC-624
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DTC P1229 SENSOR POWER SUPPLY
4. CHECK COMPONENTS
Check the following.
●Accelerator pedal position sensor (Refer to EC-656, "Component Inspection" .)
●Mass air flow sensor (Refer to EC-522, "Component Inspection" .)
●Refrigerant pressure sensor (Refer to EC-735, "Diagnostic Procedure" .)
OK or NG
OK >> GO TO 7.
NG >> Replace malfunctioning component.
5. CHECK THROTTLE POSITION SENSOR
Refer to EC-650, "
Component Inspection" .
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.
6. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace electric throttle control actuator.
2. Perform EC-449, "
Throttle Valve Closed Position Learning" .
3. Perform EC-450, "
Idle Air Volume Learning" .
>>INSPECTION END
7. CHECK INTERMITTENT INCIDENT
Refer to EC-506, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END

DTC P1805 BRAKE SWITCH
EC-625
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DTC P1805 BRAKE SWITCHPFP:25320
DescriptionEBS00NIZ
Brake switch signal is applied to the ECM through the stop lamp switch when the brake pedal is depressed.
This signal is used mainly to decrease the engine speed when the vehicle is driving.
CONSULT-II Reference Value in Data Monitor ModeEBS00NJ0
Specification data are reference values.
ECM Terminals and Reference ValueEBS00NJ1
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.
On Board Diagnosis LogicEBS00NJ2
The MI will not light up for this diagnosis.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters in fail-safe mode.
DTC Confirmation ProcedureEBS00NJ3
WITH CONSULT-II
1. Turn ignition switch “ON”.
2. Fully depress the brake pedal for at least 5 seconds.
3. Erase the DTC with CONSULT-II.
MONITOR ITEM CONDITION SPECIFICATION
BRAKE SW
●Ignition switch: ONBrake pedal: Fully released OFF
Brake pedal: Slightly depressed ON
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
40 P Stop lamp switch[Engine is running]
●Brake pedal releasedApproximately 0V
[Engine is running]
●Brake pedal depressedBATTERY VOLTAGE
(11 - 14V)
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1805
1805Brake switchA brake switch signal is not sent to ECM for an
extremely long time while the vehicle is driving.
●Harness or connectors
(Stop lamp switch circuit is open or
shorted.)
●Stop lamp switch
Engine operation condition in fail-fail safe mode
ECM controls the electric throttle control actuator by regulating the throttle opening to a small range.Therefore,acceleration will be
poor.
Vehicle condition Driving condition
When engine is idling Normal
When accelerating Poor acceleration

EC-626
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DTC P1805 BRAKE SWITCH
4. Select “DATA MONITOR” mode with CONSULT-II.
5. If 1st trip DTC is detected, go to EC-628, "
Diagnostic Procedure"
.
WITHOUT CONSULT-II
1. Turn ignition switch “ON”.
2. Fully depress the brake pedal for at least 5 seconds.
3. Erase the “Diagnostic Test Mode II (Self-diagnostic results)” memory. Refer to EC-459, "
How to Erase
Diagnostic Test Mode II (Self-diagnostic Results)" .
4. Turn ignition switch “OFF”, wait at least 10 seconds and then turn “ON”.
5. Perform “Diagnostic Test Mode II (Self-diagnostic results)” with ECM.
6. If 1st trip DTC is detected, go to EC-628, "
Diagnostic Procedure" .
SEF058Y

DTC P1805 BRAKE SWITCH
EC-627
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Wiring DiagramEBS00NJ4
TBWA0332E

EC-628
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DTC P1805 BRAKE SWITCH
Diagnostic Procedure
EBS00NJ5
1. CHECK STOP LAMP SWITCH CIRCUIT
1. Turn ignition switch “OFF”.
2. Check the stop lamp when depressing and releasing the brake pedal.
OK or NG
OK >> GO TO 4.
NG >> GO TO 2.
2. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Disconnect stop lamp switch harness connector.
2. Check voltage between stop lamp switch 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.
●15A fuse
●Fuse block (J/B) connector M2
●Harness for open and short between stop lamp switch and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
Brake pedal Stop lamp
Fully released Not illuminated
Depressed Illuminated
PBIB0498E
Voltage: Battery voltage
PBIB0117E

DTC P1805 BRAKE SWITCH
EC-629
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4.CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Disconnect stop lamp switch harness connector.
4. Check harness continuity between ECM terminal 40 and stop
lamp switch terminal 2.
Refer to Wiring Diagram.
5. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors M61, M41
●Joint connector-2 (LHD models)
●Joint connector-3 (RHD models)
●Harness for open or short between ECM and stop lamp switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.CHECK STOP LAMP SWITCH
Refer to EC-629, "
Component Inspection" .
OK or NG
OK >> GO TO 7.
NG >> Replace stop lamp switch.
7.CHECK INTERMITTENT INCIDENT
Refer to EC-115, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS00NJ6
STOP LAMP SWITCH
1. Disconnect stop lamp switch harness connector.Continuity should exist.
PBIB0498E
PBIB0498E

EC-630
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DTC P1805 BRAKE SWITCH
2. Check continuity between stop lamp switch terminals 1 and 2
under the following conditions.
3. If NG, replace stop lamp switch.
Conditions Continuity
Brake pedal fully released Should not exist.
Brake pedal depressed Should exist.
PBIB0118E