Infiniti M45 (Y34). Manual — part 397
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
EC-277
C
D
E
F
G
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A
EC
Wiring Diagram
ABS002I0
BANK 1
TBWA0278E
EC-278
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
BANK 2
TBWA0279E
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
EC-279
C
D
E
F
G
H
I
J
K
L
M
A
EC
Diagnostic Procedure
ABS002I1
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
Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace.
SEC502D
EC-280
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
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
P0172
114
1
1
P0175
115
1
2
Continuity should exist.
DTC
Terminals
Bank
ECM
Sensor
P0172
114
1
1
P0175
115
1
2
Continuity should not exist.
Continuity should exist.
At idling: 350 kPa (3.57 kg/cm
2
, 51 psi)
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