2009 INFINITI QX56 service

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Page 1431 of 4171

INFINITI QX56 2009  Factory Service Manual 
EC-104
< COMPONENT DIAGNOSIS >[VK56DE]
P0101 MAF SENSOR
1. Start engine and warm it up to normal operating temperature.
If engine cannot be started, go to  EC-105, "Diagnosis Procedure"
.
2. Select

Page 1474 of 4171

INFINITI QX56 2009  Factory Service Manual 
P0133, P0153 A/F SENSOR 1EC-147
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait a

Page 1497 of 4171

INFINITI QX56 2009  Factory Service Manual 
EC-170
< COMPONENT DIAGNOSIS >[VK56DE]
P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
7. If it is difficult to start engine at step 6, 
the fuel injection system has a malfunction, too.
8. Crank engine

Page 1499 of 4171

INFINITI QX56 2009  Factory Service Manual 
EC-172
< COMPONENT DIAGNOSIS >[VK56DE]
P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
6. Also check harness for short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or sh

Page 1502 of 4171

INFINITI QX56 2009  Factory Service Manual 
P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
EC-175
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O7. If it is difficult to start engine at step 6, 
the fuel injection system has a ma

Page 1504 of 4171

INFINITI QX56 2009  Factory Service Manual 
P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
EC-177
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to po

Page 1521 of 4171

INFINITI QX56 2009  Factory Service Manual 
EC-194
< COMPONENT DIAGNOSIS >[VK56DE]
P0300, P0301, P0302, P
0303, P0304, P0305, P0306,  P0307, P0308 MISFIRE
6. Also check harness for short to power.
OK or NG
OK >> GO TO 14.
NG >> Repair open cir

Page 1539 of 4171

INFINITI QX56 2009  Factory Service Manual 
EC-212
< COMPONENT DIAGNOSIS >[VK56DE]
P0441 EVAP CONTROL SYSTEM
OK (Without CONSULT-III)>>GO TO 3.
NG >> Replace EVAP canister.
2.CHECK PURGE FLOW
  With CONSULT-III
1. Disconnect vacuum hose connec