Infiniti M45 (Y34). Manual — part 395
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
EC-269
C
D
E
F
G
H
I
J
K
L
M
A
EC
BANK 2
TBWA0279E
EC-270
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
Diagnostic Procedure
ABS002HX
1.
CHECK EXHAUST GAS LEAK
1.
Start engine and run it at idle.
2.
Listen for an exhaust gas leak before three way catalyst (manifold).
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace.
2.
CHECK FOR INTAKE AIR LEAK
1.
Listen for an intake air leak after the mass air flow sensor.
2.
Check PCV hose connection.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace.
SEC502D
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
EC-271
C
D
E
F
G
H
I
J
K
L
M
A
EC
3.
CHECK HEATED OXYGEN SENSOR 1 CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect corresponding heated oxygen sensor 1 (HO2S1) harness connector.
3.
Disconnect ECM harness connector.
4.
Check harness continuity between ECM terminal and HO2S1 terminal as follows.
Refer to Wiring Diagram.
5.
Check harness continuity between the following terminals and ground.
Refer to Wiring Diagram.
6.
Check harness continuity between HO2S1 terminal 4 and ground.
7.
Also check harness for short to power.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness for open or short between ECM and HO2S1
●
Harness for open or short between HO2S1 and ground
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK FUEL PRESSURE
1.
Release fuel pressure to zero. Refer to
EC-46, "FUEL PRESSURE RELEASE"
2.
Install fuel pressure gauge and check fuel pressure. Refer to
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 6.
DTC
Terminals
Bank
ECM
Sensor
P0171
114
1
1
P0174
115
1
2
Continuity should exist.
DTC
Terminals
Bank
ECM
Sensor
P0171
114
1
1
P0174
115
1
2
Continuity should not exist.
Continuity should exist.
At idling: 350 kPa (3.57 kg/cm
2
, 51 psi)
EC-272
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
6.
DETECT MALFUNCTIONING PART
Check the following.
●
Fuel pump and circuit (Refer to
●
Fuel pressure regulator (Refer to
●
Fuel lines (Refer to
●
Fuel filter for clogging
>> Repair or replace.
7.
CHECK MASS AIR FLOW SENSOR
With CONSULT-II
1.
Install all removed parts.
2.
Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT-II.
With GST
1.
Install all removed parts.
2.
Check mass air flow sensor signal in MODE 1 with GST.
OK or NG
OK
>> GO TO 8.
NG
>> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or
EC-174, "DTC P0101 MAF SENSOR"
3.8 - 5.2 g·m/sec:
at idling
16.0 - 21.5 g·m/sec:
at 2,500 rpm
3.8 - 5.2 g·m/sec:
at idling
16.0 - 21.5 g·m/sec:
at 2,500 rpm
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