2007 INFINITI QX56 Factory Service Manual

Page 1257 of 3061

INFINITI QX56 2007  Factory Service Manual EC-174
< SERVICE INFORMATION >
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
BANK 2
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM gro

Page 1258 of 3061

INFINITI QX56 2007  Factory Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-175
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
Diagnosis ProcedureINFOID:0000000003531669
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch

Page 1259 of 3061

INFINITI QX56 2007  Factory Service Manual EC-176
< SERVICE INFORMATION >
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
2. Turn ignition switch ON.
3. Check voltage between HO2S2 terminal 3 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO

Page 1260 of 3061

INFINITI QX56 2007  Factory Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-177
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
1. Check resistance between HO2S2 terminals as follows.
2. If NG, replace heated oxygen senso

Page 1261 of 3061

INFINITI QX56 2007  Factory Service Manual EC-178
< SERVICE INFORMATION >
DTC P0075, P0081 IVT CONTROL SOLENOID VALVE
DTC P0075, P0081 IVT CONTROL SOLENOID VALVE
Component DescriptionINFOID:0000000003531672
Intake valve timing control solenoid

Page 1262 of 3061

INFINITI QX56 2007  Factory Service Manual DTC P0075, P0081 IVT CONTROL SOLENOID VALVE
EC-179
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
Wiring DiagramINFOID:0000000003531676
BANK 1
Specification data are reference values and are

Page 1263 of 3061

INFINITI QX56 2007  Factory Service Manual EC-180
< SERVICE INFORMATION >
DTC P0075, P0081 IVT CONTROL SOLENOID VALVE
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECMs transistor.

Page 1264 of 3061

INFINITI QX56 2007  Factory Service Manual DTC P0075, P0081 IVT CONTROL SOLENOID VALVE
EC-181
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
BANK 2
Specification data are reference values and are measured between each terminal and gro