2008 INFINITI QX56 Factory Service Manual

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Page 1769 of 4083

INFINITI QX56 2008 Factory Service Manual EC-470
< ECU DIAGNOSIS >[VK56DE]
ECM
How to Display SRT Status

WITH CONSULT-III
Selecting “SRT STATUS” in “DTC CO NFIRMATION” mode with CONSULT-III.
For items whose SRT codes are set, a “C

Page 1770 of 4083

INFINITI QX56 2008 Factory Service Manual ECM
EC-471
< ECU DIAGNOSIS > [VK56DE]
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• When any SRT codes are not set, MIL will flash periodically for 10 seconds.
How to Set SRT Code
To set all SRT codes, self-dia

Page 1771 of 4083

INFINITI QX56 2008 Factory Service Manual EC-472
< ECU DIAGNOSIS >[VK56DE]
ECM
Driving Pattern
• The time required for each diagnosis varies with road su
rface conditions, weather, altitude, individual driving
habits, etc.
Zone A refers to

Page 1772 of 4083

INFINITI QX56 2008 Factory Service Manual ECM
EC-473
< ECU DIAGNOSIS > [VK56DE]
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• Sea level
• Flat road
• Ambient air temperature: 20 - 30
°C (68 - 86 °F)
• Diagnosis is performed as quickly as possib

ECM
EC-473
< ECU DIAGNOSIS > [VK56DE]
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• Sea level
• Flat road
• Ambient air temperature: 20 - 30
°C (68 - 86 °F)
• Diagnosis is performed as quickly as possible under normal conditions. Under different conditions [For example: ambient air temperature other than 20 - 30 °C (68 - 86° F)], diagno-
sis may also be performed.
Pattern 1:
• The engine is started at the engine coolant temperature of −10 to 35 °C (14 to 95 °F)
(where the voltage between the ECM terminal 73 and ground is 3.0 - 4.3V).
• The engine must be operated at idle speed until the engine coolant temperature is greater than 70 °C
(158° F) (where the voltage between the ECM te rminal 73 and ground is lower than 1.4V).
• The engine is started at the fuel tank temperature of warmer than 0 °C (32° F) (where the voltage
between the ECM terminal 107 and ground is less than 4.1V).
Pattern 2:
• When steady-state driving is performed again even afte r it is interrupted, each diagnosis can be conducted.
In this case, the time required for diagnosis may be extended.
Pattern 3:
• Operate vehicle following the driving pattern shown in the figure.
• Release the accelerator pedal during decelerating vehicle speed from 90 km/h (56 MPH) to 0 km/h (0 MPH).
Pattern 4:
• The accelerator pedal must be held very steady during steady- state driving.
• If the accelerator pedal is moved, the test must be conducted all over again.
*1: Depress the accelerator pedal until vehicle speed is 90 km/h (56
MPH), then release the accelerator pedal and keep it released for
more than 10 seconds. Depress the accelerator pedal until vehicle
speed is 90 km/h (56 MPH) again.
*2: Checking the vehicle speed with GST is advised.
Suggested Transmi ssion Gear Position
Set the selector lever in the D position with the overdrive switch turned ON.
TEST VALUE AND TEST LIMIT
The following is the information specified in Service $06 of SAE J1979.
The test value is a parameter used to determine whether a system/circuit diagnostic test is OK or NG while
being monitored by the ECM during self-diagnosis. The test limit is a reference value which is specified as the
maximum or minimum value and is compared with the test value being monitored.
These data (test value and test limit) are specified by On Boad Monitor ID(OBDMID), Test ID (TID), Unit and
Scaling ID and can be displayed on the GST screen.
The items of the test value and test limit will be disp layed with GST screen which items are provided by the
ECM. (eg., if the bank 2 is not applied on this v ehicle, only the items of the bank 1 is displayed)
PBIB2244E
Revision: March 2010 2008 QX56

Page 1773 of 4083

INFINITI QX56 2008 Factory Service Manual EC-474
< ECU DIAGNOSIS >[VK56DE]
ECM
ItemOBD-
MID Self-diagnostic test item
DTCTest value and Test
limit
(GST display) Description
TID Unit and
Scaling ID
HO2S 01H
Air fuel ratio (A/F) sensor 1
(B

Page 1774 of 4083

INFINITI QX56 2008 Factory Service Manual ECM
EC-475
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HO2S 05H
Air fuel ratio (A/F) sensor 1
(Bank 2) P0151 83H 0BH
Minimum sensor output voltage
for test cycle
P0151 84H 0BH Maximum

Page 1775 of 4083

INFINITI QX56 2008 Factory Service Manual EC-476
< ECU DIAGNOSIS >[VK56DE]
ECM
EGR
SYSTEM31H EGR function P0400 80H 96H
Low Flow Faults: EGR temp
change rate (short term)
P0400 81H 96H Low Flow Faults: EGR temp
change rate (long term)
P040

EC-476
< ECU DIAGNOSIS >[VK56DE]
ECM
EGR
SYSTEM31H EGR function P0400 80H 96H
Low Flow Faults: EGR temp
change rate (short term)
P0400 81H 96H Low Flow Faults: EGR temp
change rate (long term)
P0400 82H 96H Low Flow Faults: Difference be-
tween max EGR temp and EGR
temp under idling condition
P0400 83H 96H Low Flow Faults: Max EGR temp
P1402 84H 96H High Flow Faults: EGR temp in-
crease rate
EVAP
SYSTEM 39H
EVAP control
system leak
(Cap Off) P0455 80H 0CHDifference in pressure sensor out-
put voltage before and after pull
down
3BH EVAP control
system leak
(Small leak) P0442 80H 05H
Leak area index (for more than
0.04inch)
3CH EVAP control system
(Very small leak) P0456 80H 05H
Leak area index (for more than
0.02inch)
P0456 81H FDH Maximum internal pressure of
EVAP system during monitoring
3DH Purge flow system P0441 83H 0CHDifference in pressure sensor out-
put voltage before and after vent
control value close
O2 SEN-
SOR
HEATER 41H
A/F sensor 1 heater
(Bank 1) Low Input:P0031
High Input:P0032 81H 0BHConverted value of Heater electric
current to voltage
42H Heated oxygen sensor 2
(Bank 1) Low Input:P0037
High Input:P0038 80H 0CH
Converted value of Heater electric
current to voltage
43H Heated oxygen sensor 3
(Bank 1) P0043 80H 0CHConverted value of Heater electric
current to voltage
45H A/F sensor 1 heater
(Bank 2) Low Input:P0051
High Input:P0052 81H 0BHConverted value of Heater electric
current to voltage
46H Heated oxygen sensor 2
(Bank 2) Low Input:P0057
High Input:P0058 80H 0CHConverted value of Heater electric
current to voltage
47H Heated oxygen sensor 3
(Bank 2) P0063 80H 0CH
Converted value of Heater electric
current to voltage
SEC-
OND-
ARY AIR 71H Secondary Air system P0411 80H 01H
Secondary Air Injection System
Incorrect Flow Detected
Bank1: P0491
Bank2: P0492 81
H 0
1HSe
condary Air Injection System
Insufficient Flow
P2445 82H 01H Secondary Air Injection System
Pump Stuck Off
P2448 83H 01H Secondary Air Injection System
High Airflow
Bank1: P2440
Bank2: P2442 84H 01HSecondary Air Injection System
Switching Valve Stuck Open
P2440 85H 01H Secondary Air Injection System
Switching Valve Stuck Open
P2444 86H 01H Secondary Air Injection System
Pump Stuck On
Item
OBD-
MID Self-diagnostic test item
DTCTest value and Test
limit
(GST display) Description
TID Unit and
Scaling ID
Revision: March 2010 2008 QX56

Page 1776 of 4083

INFINITI QX56 2008 Factory Service Manual ECM
EC-477
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FUEL
SYSTEM
81H
Fuel injection system function
(Bank 1) P0171 or P0172 80H 2FH Long term fuel trim
P0171 or P0172 81H 24H
The nu

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