2007 INFINITI QX56 Factory Service Manual

cabin filter lights fuel type wheel torque sensor high beam

Page 1385 of 3061

INFINITI QX56 2007 Factory Service Manual EC-302
< SERVICE INFORMATION >
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
7. If it is difficult to start engine at step 6, the fuel injection system has a malfunction, too.
8. Crank engine while

EC-302
< SERVICE INFORMATION >
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
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-306, "
Diagnosis Procedure". If engine does not start, remove spark plugs and
check for fouling, etc.
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 run engine for at least 5 seconds at idle speed.
4. Stop engine and reconnect mass air flow sensor harness con-
nector.
5. Select Service $03 with GST. Make sure DTC P0102 is
detected.
6. Select Service $04 with GST and erase the DTC P0102.
7. Start engine again and let it idle for at least 10 minutes.
8. Select Service $07 with GST. The 1st trip DTC P0172 or P0175
should be detected at this stage, if a malfunction exists. If so, go
to EC-306, "
Diagnosis Procedure".
NOTE:
If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for 10 min-
utes. Refer to the table below.
Hold the accelerator pedal as steady as possible.
The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following con-
ditions should be satisfied at the same time.
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-306, "
Diagnosis Procedure". If engine does not start, remove spark plugs and
check for fouling, etc.
BBIA0368E
Engine speed Engine speed in the freeze frame data ± 400 rpm
Vehicle speed Vehicle speed in the freeze frame data ± 10 km/h (6 MPH)
Engine coolant temperature (T)
conditionWhen the freeze frame data shows lower than 70 °C (158 °F),
T should be lower than 70 °C (158 °F).
When the freeze frame data shows higher than or equal to 70 °C (158 °F),
T should be higher than or equal to 70 °C (158 °F).

Page 1386 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
EC-303
< SERVICE INFORMATION >
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Wiring DiagramINFOID:0000000003531798
BANK 1
Specification data are reference values and

Page 1387 of 3061

INFINITI QX56 2007 Factory Service Manual EC-304
< SERVICE INFORMATION >
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECMs transis

Page 1388 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
EC-305
< SERVICE INFORMATION >
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BANK 2
Specification data are reference values and are measured between each terminal and

Page 1389 of 3061

INFINITI QX56 2007 Factory Service Manual EC-306
< SERVICE INFORMATION >
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnosis ProcedureINFOID:0000

Page 1390 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
EC-307
< SERVICE INFORMATION >
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OK or NG
OK >> GO TO 3.
NG >> Repair or replace.
3.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUI

Page 1391 of 3061

INFINITI QX56 2007 Factory Service Manual EC-308
< SERVICE INFORMATION >
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
• Fuel pressure regulator (Refer to EC-80, "Fuel Pressure Check".)
>> Repair or replace.
6.CHECK MASS AIR FLOW SENSOR

Page 1392 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
EC-309
< SERVICE INFORMATION >
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5. Prepare pans or saucers under each fuel injectors.
6. Crank engine for about 3 seconds

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