2001 NISSAN ALMERA Service Manual

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Page 1017 of 2898

NISSAN ALMERA 2001 Service Manual Wiring DiagramNJEC0185SEDAN MODELS AND HATCHBACK MODELS WITH
ECM IN ENGINE COMPARTMENT
NJEC0185S03
HEC788
DTC P0141 HEATED OXYGEN SENSOR 2 HEATER (REAR)QG
Wiring Diagram
EC-293

Page 1018 of 2898

NISSAN ALMERA 2001 Service Manual HATCHBACK MODELS WITH ECM IN CABINNJEC0185S04
HEC942
DTC P0141 HEATED OXYGEN SENSOR 2 HEATER (REAR)QG
Wiring Diagram (Contd)
EC-294

Page 1019 of 2898

NISSAN ALMERA 2001 Service Manual Diagnostic ProcedureNJEC0186
1 CHECK POWER SUPPLY
1. Turn ignition switch ªOFFº.
2. Disconnect heated oxygen sensor 2 (rear) harness connector.
SEF160Z
3. Turn ignition switch ªONº.
4. Check volta

Page 1020 of 2898

NISSAN ALMERA 2001 Service Manual 4 DETECT MALFUNCTIONING PART
Check the harness for open or short between heated oxygen sensor 2 heater (rear) and ECM.
©Repair open circuit or short to ground or short to power in harness or connecto

Page 1021 of 2898

NISSAN ALMERA 2001 Service Manual On Board Diagnosis LogicNJEC0188With 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 feedb

On Board Diagnosis LogicNJEC0188With 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 sensor 1 (front).
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 lean.), the
ECM judges the condition as the fuel injection system malfunction and lights up the MIL (2 trip detection logic).
Sensor Input Signal to ECMECM func-
tionActuator
Heated oxygen sensor 1 (front)Density of oxygen in exhaust gas
(Mixture ratio feedback signal)Fuel injec-
tion & mix-
ture ratio
controlInjectors
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P0171
0171+Fuel injection system does not operate properly.
+The amount of mixture ratio compensation is too large.
(The mixture ratio is too lean.)+Intake air leaks
+Heated oxygen sensor 1 (front)
+Injectors
+Exhaust gas leaks
+Incorrect fuel pressure
+Lack of fuel
+Mass air flow sensor
SEF215Z
SEF058Y
DTC Confirmation ProcedureNJEC0189NOTE:
If ªDTC Confirmation Procedureº has been previously conducted,
always turn ignition switch ªOFFº and wait at least 9 seconds
before conducting the next test.
With CONSULT-II
1) Start engine and warm it up to normal operating temperature.
2) Turn ignition switch ªOFFº and wait at least 9 seconds.
3) Turn ignition switch ªONº and select ªSELF-LEARN CON-
TROLº in ªWORK SUPPORTº mode with CONSULT-II.
4) Clear the self-learning control coefficient by touching ªSTARTº.
5) Select ªDATA MONITORº mode with CONSULT-II.
6) Start engine again and let it idle for at least 10 minutes.
The 1st trip DTC P0171 should be detected at this stage, if a
malfunction exists. If so, go to ªDiagnostic Procedureº,
EC-301.
7) If it is difficult to start engine at step 6, the fuel injection sys-
tem has a malfunction.
8) Crank engine while depressing accelerator pedal. If engine
starts, go to ªDiagnostic Procedureº, EC-301. If engine does
not start, visually check for exhaust and intake air leak.
JEF105Y
With GST
1) Start engine and warm it up to normal operating temperature.
2) Turn ignition switch ªOFFº and wait at least 9 seconds.
3) Disconnect mass air flow sensor harness connector. Then
restart and run engine for at least 3 seconds at idle speed.
4) Stop engine and reconnect mass air flow sensor harness con-
nector.
5) Select ªMODE 7º with GST. Make sure 1st trip DTC P0100 is
detected.
6) Select ªMODE 4º with GST and erase the 1st trip DTC P0100.
DTC P0171 FUEL INJECTION SYSTEM FUNCTION (LEAN SIDE)QG
On Board Diagnosis Logic
EC-297

Page 1022 of 2898

NISSAN ALMERA 2001 Service Manual 7) Start engine again and run it for at least 10 minutes at idle
speed.
8) Select ªMODE 7º with GST. The 1st trip DTC P0171 should be
detected at this stage, if a malfunction exists. If so, go to
ª

Page 1023 of 2898

NISSAN ALMERA 2001 Service Manual Wiring DiagramNJEC0190SEDAN MODELS AND HATCHBACK MODELS WITH
ECM IN ENGINE COMPARTMENT
NJEC0190S03
HEC789
DTC P0171 FUEL INJECTION SYSTEM FUNCTION (LEAN SIDE)QG
Wiring Diagram
EC-299

Page 1024 of 2898

NISSAN ALMERA 2001 Service Manual HATCHBACK MODELS WITH ECM IN CABINNJEC0190S04
HEC944
DTC P0171 FUEL INJECTION SYSTEM FUNCTION (LEAN SIDE)QG
Wiring Diagram (Contd)
EC-300

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