ITB15004

Classification:
Reference:
Date:
EC15-001
ITB15-004
January 21, 2015
2014-2015 Q50; MIL ON WITH DTC P0171 AND/OR P0174
APPLIED VEHICLE: 2014-2015 Q50 (V37)
Does not apply to Q50 Hybrid
IF YOU CONFIRM:
The MIL is ON after the engine has been idling a while and one or both of the following DTCs are found stored
in the ECM:

P0171 (FUEL SYS-LEAN-B1)

P0174 (FUEL SYS-LEAN-B2)
ACTION:
1. Confirm this bulletin applies.

Compare the vehicle’s current ECM part number to those listed in Table A (see page 5).
2. If the ECM part number does not match one listed in Table A, this bulletin does not apply. Go back
to ASIST for further diagnostic and repair information.
3. If this bulletin applies, reprogram the ECM.
IMPORTANT: The purpose of ACTION (above) is to give you a quick idea of the work you will be performing. You MUST
closely follow the entire SERVICE PROCEDURE as it contains information that is essential to successfully completing
this repair.
Infiniti Bulletins are intended for use by qualified technicians, not 'do-it-yourselfers'. Qualified technicians are properly trained
individuals who have the equipment, tools, safety instruction, and know-how to do a job properly and safely. NOTE: If you believe that
a described condition may apply to a particular vehicle, DO NOT assume that it does. See your Infiniti dealer to determine if this
applies to your vehicle.
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SERVICE PROCEDURE
NOTE:

Most instructions for reprogramming with CONSULT-III plus (C-III plus) are displayed on the CONSULT
PC screen.

If you are not familiar with the reprogramming procedure, click here. This will link you to the
"CONSULT- III plus (C-III plus) ECM Reprogramming" general procedure.

Take the vehicle for a 10 minute drive in order to meet the following Idle Air Volume Learn (IAVL)
conditions:
 Engine coolant temperature: 70 - 105°C
(158 - 221°F)
 Battery voltage: More than 12.9V (At idle)
 Transmission: Warmed up
Figure A

After reprogramming is complete, you will be required to perform Throttle Valve Closed Position, Idle
Air Volume Learn, Accelerator Closed Position, and DTC erase.
CAUTION:

Connect the GR8 to the vehicle 12 volt battery and set to ECM power supply mode. If the vehicle
battery voltage drops below 12.0V or above 15.5V during reprogramming, the ECM may be
damaged.

Be sure to turn OFF all vehicle electrical loads. If a vehicle electrical load remains ON, the ECM
may be damaged.

Be sure to connect the AC Adapter. If the CONSULT PC battery voltage drops during
reprogramming, the process will be interrupted and the ECM may be damaged.

Turn off all external Bluetooth® devices (e.g., cell phones, printers, etc.) within range of the
CONSULT PC and the plus VI. If Bluetooth® signal waves are within range of the CONSULT PC
and the plus VI during reprogramming, reprogramming may be interrupted and the ECM may be
damaged.
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1. Connect the CONSULT PC to the vehicle to begin the reprogramming procedure.
2
Start C-III plus.
3. Wait for the plus VI to be recognized / connected.

The serial number will display when the plus VI is recognized / connected.
4. Select Re/programming, Configuration.
Step 3: plus VI
is recognized
Step
4
Figure 1
5. Follow the on-screen instructions and navigate the C-III plus to the screen shown in Figure 2 on the next
page.
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6. When you get to the screen shown in Figure 2, confirm this bulletin applies as follows.
A. Find the ECM Part Number and write it on the repair order.
NOTE: This is the current ECM Part Number (P/N).
6A: Current ECM P/N
Figure 2
B. Compare the P/N you wrote down to the numbers in the Current ECM Part Number column in
Table A on the next page.

If there is a match, this bulletin applies. Continue with the reprogramming procedure.

If there is not a match, this bulletin does not apply. Close C-III plus and refer to ASIST for further
diagnostic information.
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Table A
Model
Current ECM Part Number: 23710-
2014 Q50
2015 Q50
4HB1A,
4HB1B,
4HH1A,
4HH1B,
4GA7A, 4GA8A, 4GA9A
4GA7B, 4GA8B, 4GA9B
4GA7C, 4GA8C, 4GA9C
4GA7D, 4GA8D, 4GA9D
4GB1A, 4GB2A, 4GB3A
4GB1B, 4GB2B, 4GB3B
4GB1C, 4GB2C, 4GB3C
4GB1D, 4GB2D, 4GB3D
4HB2A, 4HB3A, 4HB4A, 4HB5A,
4HB2B, 4HB3B, 4HB4B, 4HB5B,
4HH2A, 4HH3A, 4HH4A, 4HH5A,
4HH2B, 4HH3B, 4HH4B, 4HH5B,
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4HB6A
4HB6B
4HH6A
4HH6B
ITB15-004
7. Follow the on-screen instructions to navigate C-III plus and reprogram the ECM.
NOTE:

In some cases, more than one new P/N for reprogramming is available.
 In this case, the screen in Figure 3 displays.
 Select and use the reprogramming option that does not have the message “Caution! Use ONLY
with ITBXX-XXX”.

If you get this screen and it is blank (no reprogramming listed), it means there is no reprogramming
available for this vehicle. Close C-III plus and refer back to ASIST for further diagnosis.
Figure 3
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8. When the screen in Figure 4 displays, reprogramming is complete.
NOTE: If the screen in Figure 4 does not display (reprogramming does not complete), refer to the
information on page 8.
9. Disconnect the battery charger from the vehicle.
10. Select Next.
Step
10
Figure 4
NOTE:

In the next steps, starting on page 9, you will perform Throttle Valve Closed Position, Idle Air Volume
Learn, Accelerator Closed Position, and DTC erase.

These operations are required before C-III plus will provide the final reprogramming confirmation
report.
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ECM recovery:
Do not disconnect plus VI or shut down CONSULT III plus if reprogramming does not complete.
If reprogramming does not complete and the “!?” icon displays as shown in
Figure 5:

Check battery voltage
(12.0–15.5 V).

Ignition is ON, engine OFF.

External Bluetooth® devices are
OFF.

All electrical loads are OFF.

Select retry and follow the on
screen instructions.

“Retry” may not go through on first
attempt and can be selected more
than once.
Figure 5
If reprogramming does not complete and the “X” icon displays as shown in
Figure 6:

Check battery voltage
(12.0 – 15.5 V).

CONSULT A/C adapter is plugged
in.

Ignition is ON, engine OFF.

Transmission is in Park.

All C-III plus / VI cables are securely
connected.

All C-III plus updates are installed.

Select Home, and restart the
reprogram procedure from the
beginning.
Figure 6
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11. Follow the on-screen instructions to perform the following:

Throttle Valve Closed Position

Idle Air Volume Learn (IAVL)
NOTE:
 Listed below are common conditions required for IAVL to complete.
 If IAVL does not complete within a few minutes, a condition may be out of range.
 Refer to the appropriate Electronic Service Manual (ESM) for specific conditions required
for the vehicle you are working on.
o Engine coolant temperature: 70 -105° C (158 - 221°F)
o Battery voltage: More than 12.9V (At idle)
o Selector lever: P or N
o Electric load switch: OFF (Air conditioner, headlamp, rear window defogger)
o Steering wheel: Neutral (Straight-ahead position)
o Vehicle speed: Stopped
o Transmission: Warmed up

Accelerator Pedal Close Position Learning

Erase DTCs
Continue to the next page.
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12. When the entire reprogramming process is complete, the screen in Figure 7 will display.
13. Verify the before and after part numbers are different.
14. Print a copy of this screen (Figure 7) and attach it to the repair order for warranty documentation.
15. Select Confirm.
Step
13
Step
14
Step
15
Figure 7
16. Close C-III plus.
17. Turn the ignition OFF.
18. Disconnect the plus VI from the vehicle.
19. Test drive the vehicle and make sure it operates correctly and the MIL is OFF.


If the MIL comes ON, go back to ASIST for further diagnostic information.
Diagnosis and repairs beyond ECM reprogramming are not covered by this bulletin.
CLAIMS INFORMATION
Submit a Primary Part (PP) type line claim using the following claims coding:
DESCRIPTION
PFP
OP CODE
SYM
DIA
FRT
Reprogram Engine Control Module
(1)
DE97AA
ZE
32
(2) (3)
(1) Refer to the electronic parts catalog (FAST) and use the ECM assembly part number as the Primary
Failed Part (PFP).
(2) Reference the current Infiniti Warranty Flat Rate Manual and use the indicated FRT.
(3) FRT allows adequate time to access DTC codes and reprogram ECM. No other diagnostic procedures
subsequently required. Do NOT claim any Diagnostic Op Codes with this claim.
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