Infiniti M35/M45 Y50. Manual - part 462

DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION

EC-321

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

If engine starts, go to 

EC-326, "Diagnostic 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 (1) 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-326, "Diagnostic 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-326, "Diagnostic Procedure"

 . If engine does not start, remove spark plugs and

check for fouling, etc.

PBIB2783E

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) condition

When 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).

EC-322

[VQ35DE]

DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION

Wiring Diagram

NBS004XY

BANK 1

TBWT0956E

DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION

EC-323

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECMs transistor. Use a ground other than ECM terminals, such as the ground.

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

2

SB

A/F sensor 1 heater
(bank 1)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 5V

16

G/W

A/F sensor 1 (bank 1)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 3.1V

35

BR/W

Approximately 2.6V

56

G

Approximately 2.3V

75

GR

Approximately 2.3V

21
22
23

W
R/Y
R/B

Fuel injector No. 5
Fuel injector No. 3
Fuel injector No. 1

[Engine is running]

●

Warm-up condition

●

Idle speed

NOTE:
The pulse cycle changes depending on rpm 
at idle

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]

●

Warm-up condition

●

Engine speed: 2,000 rpm

BATTERY VOLTAGE

(11 - 14V)

PBIB1584E

PBIB0042E

PBIB0043E

EC-324

[VQ35DE]

DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION

BANK 2

TBWT0957E