2008 INFINITI QX56 Factory Service Manual

Page 1345 of 4083

INFINITI QX56 2008  Factory Service Manual EC-46
< FUNCTION DIAGNOSIS >[VK56DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
 NO TOOLS
A SRT code itself can not be displayed while only SRT status can be.
1. Turn ignition switch ON and wait 20 seconds.
2.

Page 1346 of 4083

INFINITI QX56 2008  Factory Service Manual ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-47
< FUNCTION DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
Driving Pattern
• The time required for each diagnosis varies with road su
rface conditions, wea

Page 1347 of 4083

INFINITI QX56 2008  Factory Service Manual EC-48
< FUNCTION DIAGNOSIS >[VK56DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
• Sea level
• Flat road
• Ambient air temperature: 20 - 30
°C (68 - 86° F)
• Diagnosis is performed as quickly  as possi

Page 1348 of 4083

INFINITI QX56 2008  Factory Service Manual ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-49
< FUNCTION DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
Item
OBD-
MID Self-diagnostic test item
DTCTest value and Test 
limit
(GST display) Description
TI

Page 1349 of 4083

INFINITI QX56 2008  Factory Service Manual EC-50
< FUNCTION DIAGNOSIS >[VK56DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
HO2S05H
Air fuel ratio (A/F) sensor 1 
(Bank 2) P0151 83H 0BH
Minimum sensor output voltage 
for test cycle
P0151 84H 0BH Maximum

Page 1350 of 4083

INFINITI QX56 2008  Factory Service Manual ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-51
< FUNCTION DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
EGR 
SYSTEM
31H EGR function P0400 80H 96H
Low Flow Faults: EGR temp 
change rate (short term)
P04

Page 1351 of 4083

INFINITI QX56 2008  Factory Service Manual EC-52
< FUNCTION DIAGNOSIS >[VK56DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
FUEL 
SYSTEM81H
Fuel injection system function 
(Bank 1) P0171 or P0172 80H 2FH Long term fuel trim
P0171 or P0172 81H 24H
The num

Page 1352 of 4083

INFINITI QX56 2008  Factory Service Manual ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-53
< FUNCTION DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
MISFIRE
A1H Multiple Cylinder Misfire P0301 80H 24H
Misfiring counter at 1000rev of the 
first cyl