Infiniti M45 (Y34). Manual — part 394
DTC P0139, P0159 HO2S2
EC-265
C
D
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M
A
EC
Removal and Installation
ABS002HT
HEATED OXYGEN SENSOR 2
Refer to
EC-266
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
PFP:16600
On Board Diagnosis Logic
ABS002HU
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 lean.), the
ECM judges the condition as the fuel injection system malfunction and lights up the MIL (2 trip detection logic).
DTC Confirmation Procedure
ABS002HV
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 P0171 or P0174 should be detected at this
stage, if a malfunction exists. If so, go to
.
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-270, "Diagnostic Procedure"
. If engine does not
start, check exhaust and intake air leak visually.
Sensor
Input Signal to ECM
ECM function
Actuator
Heated oxygen sensor 1
Density of oxygen in exhaust gas
(Mixture ratio feedback signal)
Fuel injection control
Fuel injector
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0171
0171
(Bank 1)
Fuel injection system too
lean
●
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
●
Fuel injector
●
Exhaust gas leaks
●
Incorrect fuel pressure
●
Lack of fuel
●
Mass air flow sensor
●
Incorrect PCV hose connection
P0174
0174
(Bank 2)
SEF968Y
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
EC-267
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EC
WITH GST
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Disconnect mass air flow sensor harness connector. Then
restart and let engine idle for at least 5 seconds.
4.
Stop engine and reconnect mass air flow sensor harness con-
nector.
5.
Select “MODE 3” with GST. Make sure DTC P0102 is detected.
6.
Select “MODE 4” with GST and erase the DTC P0102.
7.
Start engine again and let it idle for at least 10 minutes.
8.
Select “MODE 7” with GST. The 1st trip DTC P0171 or P0174
should be detected at this stage, if a malfunction exists. If so, go
to
EC-270, "Diagnostic Procedure"
9.
If it is difficult to start engine at step 7, the fuel injection system
has a malfunction.
10. Crank engine while depressing accelerator pedal. If engine starts, go to
EC-270, "Diagnostic Procedure"
If engine does not start, check exhaust and intake air leak visually.
PBIB1119E
EC-268
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
Wiring Diagram
ABS002HW
BANK 1
TBWA0278E
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