2003 NISSAN X-TRAIL Service Repair Manual

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Page 601 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P0172 FUEL INJECTION SYSTEM FUNCTION
EC-223
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DTC P0172 FUEL INJECTION SYSTEM FUNCTIONPFP:16600
On Board Diagnosis LogicEBS010P7
With the Air-Fuel Mi

DTC P0172 FUEL INJECTION SYSTEM FUNCTION
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DTC P0172 FUEL INJECTION SYSTEM FUNCTIONPFP:16600
On Board Diagnosis LogicEBS010P7
With the Air-Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The
ECM calculates the necessary compensation to correct the offset between the actual and the theoretical
ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too rich.), the
ECM judges the condition as the fuel injection system malfunction and lights up the MI (2 trip detection logic).
DTC Confirmation ProcedureEBS010P8
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. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON and select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CON-
SULT-II.
4. Clear the self-learning control coefficient by touching “CLEAR”.
5. Select “DATA MONITOR” mode with CONSULT-II.
6. Start engine again and let it idle for at least 10 minutes.
The 1st trip DTC P0172 should be detected at this stage, if a
malfunction exists. If so, go to EC-226, "
Diagnostic Procedure" .
7. If it is difficult to start engine at step 6, the fuel injection system
has a malfunction, too.
8. Crank engine while depressing accelerator pedal.
If engine starts, go to EC-226, "
Diagnostic Procedure" . If engine
does not start, remove ignition plugs and check for fouling, etc.
Sensor Input Signal to ECM ECM function Actuator
Heated oxygen sensor 1Density of oxygen in exhaust gas
(Mixture ratio feedback signal)Fuel injection control Fuel injector
DTC No.Trouble diagnosis
nameDTC detecting condition Possible cause
P0172
0172Fuel injection system
too rich
Fuel injection system does not operate properly.
The amount of mixture ratio compensation is too
large.
(The mixture ratio is too rich.)
Heated oxygen sensor 1
Fuel injector
Exhaust gas leaks
Incorrect fuel pressure
Mass air flow sensor
SEF215Z

Page 602 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-224
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DTC P0172 FUEL INJECTION SYSTEM FUNCTION

WITH GST
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 second

Page 603 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P0172 FUEL INJECTION SYSTEM FUNCTION
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Wiring DiagramEBS010P9
TBWA0604E

Page 604 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-226
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DTC P0172 FUEL INJECTION SYSTEM FUNCTION

Diagnostic ProcedureEBS010PA
1. CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust gas leak befo

Page 605 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P0172 FUEL INJECTION SYSTEM FUNCTION
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5. CHECK MASS AIR FLOW SENSOR
With CONSULT-II
1. Install all removed parts.
2. Check “MASS AIR FLOW�

Page 606 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-228
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DTC P0172 FUEL INJECTION SYSTEM FUNCTION

7. CHECK INJECTOR
1. Remove injector assembly. Refer to EM-32, "
FUEL INJECTOR AND FUEL TUBE" .
Keep fuel hose and all injectors

Page 607 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P0222, P0223 TP SENSOR
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DTC P0222, P0223 TP SENSORPFP:16119
Component DescriptionEBS010PB
Electric throttle control actuator consists of thro

DTC P0222, P0223 TP SENSOR
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DTC P0222, P0223 TP SENSORPFP:16119
Component DescriptionEBS010PB
Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has the two sensors. These sensors are
a kind of potentiometers which transform the throttle valve position
into output voltage, and emit the voltage signal to the ECM. In addi-
tion, these sensors detect the opening and closing speed of the
throttle valve and feed the voltage signals to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and the ECM controls the throttle control motor to make the
throttle valve opening angle properly in response to driving condi-
tion.
CONSULT-II Reference Value in Data Monitor ModeEBS010PC
Specification data are reference values.
*: Throttle position sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.
On Board Diagnosis LogicEBS010PD
These self-diagnoses have 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 ProcedureEBS010PE
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.
PBIB0145E
MONITOR ITEM CONDITION SPECIFICATION
THRTL SEN1
THRTL SEN2*
Ignition switch: ON
(Engine stopped)Accelerator pedal: Fully released More than 0.36V
Shift lever: D (A/T), 1st (M/T) Accelerator pedal: Fully depressed Less than 4.75V
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0222
0222Throttle position sensor 1
circuit low inputAn excessively low voltage from the TP sensor 1
is sent to ECM.
Harness or connectors
(TP sensor 1 circuit is open or shorted.)
(APP sensor 2 circuit is shorted.)
Electric throttle control actuator
(TP sensor 1)
Accelerator pedal position sensor P0223
0223Throttle position sensor 1
circuit high inputAn excessively high voltage from the TP sensor
1 is sent to ECM.
Engine operation condition in fail-safe mode
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 the opening speed of the throttle valve to be slower than the normal condition.
So, the acceleration will be poor.

Page 608 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-230
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DTC P0222, P0223 TP SENSOR

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

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