Infiniti G35 (V35). Manual — part 362
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
EC-329
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EC
4.
CHECK FUEL PRESSURE
1.
Release fuel pressure to zero. Refer to
EC-81, "FUEL PRESSURE RELEASE"
2.
Install fuel pressure gauge and check fuel pressure. Refer to
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
●
Fuel pump and circuit (Refer to
.)
●
Fuel pressure regulator (Refer to
●
●
Fuel filter for clogging
>> Repair or replace.
6.
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 Service $01 with GST.
OK or NG
OK (With CONSULT-II)>>GO TO 7.
OK (Without COUSULT-II)>>GO TO 8.
NG
>> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or
EC-207, "DTC P0101 MAF SENSOR"
At idling: Approximately 350 kPa (3.57 kg/cm
2
, 51 psi)
2.0 - 6.0 g·m/sec:
at idling
7.0 - 20.0 g·m/sec:
at 2,500 rpm
2.0 - 6.0 g·m/sec:
at idling
7.0 - 20.0 g·m/sec:
at 2,500 rpm
EC-330
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
7.
CHECK FUNCTION OF FUEL INJECTOR
With CONSULT-II
1.
Start engine.
2.
Perform “POWER BALANCE” in “ACTIVE TEST” mode with
CONSULT-II.
3.
Make sure that each circuit produces a momentary engine
speed drop.
OK or NG
OK
>> GO TO 10.
NG
>> Perform trouble diagnosis for FUEL INJECTOR, refer to
PBIB0133E
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
EC-331
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8.
CHECK FUNCTION OF FUEL INJECTOR-I
Without CONSULT-II
1.
Stop engine.
2.
Disconnect harness connectors F33, F221
3.
Turn ignition switch ON.
4.
Check voltage between harness connector F33 terminal 5 and
ground with CONSULT-II or tester.
5.
Turn ignition switch OFF.
6.
Disconnect ECM harness connector.
7.
Check harness continuity between harness connector F33 and
ECM as follows.
Refer to Wiring Diagram.
8.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 9.
NG
>> Perform trouble diagnosis for FUEL INJECTOR, refer to
PBIB2479E
Voltage: Battery voltage
Cylinder
Harness connector F33
terminal
ECM terminal
1
6
23
2
4
42
3
2
22
4
3
41
5
1
21
6
7
40
Continuity should exist.
PBIB2323E
EC-332
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
9.
CHECK FUNCTION OF FUEL INJECTOR-II
Provide battery voltage between harness connector F221 as follows
and then interrupt it. Listen to each fuel injector operating sound.
OK or NG
OK
>> GO TO 10.
NG
>> Perform trouble diagnosis for INJECTOR CIRCUIT, refer to
.
10.
CHECK FUEL INJECTOR
1.
Confirm that the engine is cooled down and there are no fire hazards near the vehicle.
2.
Turn ignition switch OFF.
3.
Reconnect all harness connectors disconnected.
4.
Disconnect all fuel injector harness connectors.
5.
Remove fuel injector gallery assembly. Refer to
EM-38, "FUEL INJECTOR AND FUEL TUBE"
.
Keep fuel hose and all fuel injectors connected to injector gallery.
6.
For DTC P0171, reconnect fuel injector harness connectors on bank 1.
For DTC P0174, reconnect fuel injector harness connectors on bank 2.
7.
Disconnect all ignition coil harness connectors.
8.
Prepare pans or saucers under each injector.
9.
Crank engine for about 3 seconds.
For DTC P0171, make sure that fuel sprays out from fuel injec-
tors on bank 1.
For DTC P0174, make sure that fuel sprays out from fuel injec-
tors on bank 2.
OK or NG
OK
>> GO TO 11.
NG
>> Replace fuel injectors from which fuel does not spray
out. Always replace O-ring with new ones.
11.
CHECK INTERMITTENT INCIDENT
Refer to
EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
Cylinder
Harness connector F221 terminal
(+)
(–)
1
5
6
2
4
3
2
4
3
5
1
6
7
Operating sound should exist.
PBIB2497E
Fuel should be sprayed evenly for each injector.
PBIB1726E
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