2008 INFINITI QX56 Factory Service Manual

Page 1361 of 4083

INFINITI QX56 2008  Factory Service Manual EC-62
< FUNCTION DIAGNOSIS >[VK56DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
EXPLANATION FOR DRIVING PATTERNS EXCEPT  FOR “MISFIRE <EXHAUST QUALITY DETE-
RIORATION>”, “FUEL INJECTION SYSTEM”
*1: When

Page 1362 of 4083

INFINITI QX56 2008  Factory Service Manual ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-63
< FUNCTION DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
<Driving Pattern A>
• The A counter will be cleared when the malfunction is detected regardless

Page 1363 of 4083

INFINITI QX56 2008  Factory Service Manual EC-64
< FUNCTION DIAGNOSIS >[VK56DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
ItemDIAGNOSTIC TEST MODE
WORK  SUP-
PORT SELF-DIAGNOSTIC 
RESULTS DATA 
MONI-
TOR ACTIVE 
TEST DTC & SRT
CONFIRMATION
DTC*1 FREEZE

Page 1364 of 4083

INFINITI QX56 2008  Factory Service Manual ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-65
< FUNCTION DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
X: Applicable
*1: This item includes 1st trip DTCs.
*2: This mode includes 1st trip freeze frame d

Page 1365 of 4083

INFINITI QX56 2008  Factory Service Manual EC-66
< FUNCTION DIAGNOSIS >[VK56DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
*: This function is not necessary in the usual service procedure.
SELF-DIAG RESULTS MODE
Self Diagnostic Item
Regarding items of D

Page 1366 of 4083

INFINITI QX56 2008  Factory Service Manual ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-67
< FUNCTION DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
*: The item is the same as that of 1st trip freeze frame data.
DATA MONITOR MODE
Monitored Item
×

Page 1367 of 4083

INFINITI QX56 2008  Factory Service Manual EC-68
< FUNCTION DIAGNOSIS >[VK56DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
TP SEN 1-B1 [V]
××
• The throttle position sensor signal volt-
age is displayed. • TP SEN 2-B1 signal is converted by 
ECM i

Page 1368 of 4083

INFINITI QX56 2008  Factory Service Manual ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-69
< FUNCTION DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
PURG VOL C/V [%]
• Indicates the EVAP canister purge vol-
ume control solenoid valve control val