2007 INFINITI QX56 Factory Service Manual

catalytic converter warning winter tyres boot battery replacement ECU

Page 1305 of 3061

INFINITI QX56 2007 Factory Service Manual EC-222
< SERVICE INFORMATION >
DTC P0127 IAT SENSOR
1. Check resistance between intake air temperature sensor termi-
nals 5 and 6 under the following conditions.
2. If NG, replace mass air flow sensor

Page 1306 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0128 THERMOSTAT FUNCTION
EC-223
< SERVICE INFORMATION >
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DTC P0128 THERMOSTAT FUNCTION
On Board Diagnosis LogicINFOID:0000000003531731
Engine coolant temperature ha

DTC P0128 THERMOSTAT FUNCTION
EC-223
< SERVICE INFORMATION >
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DTC P0128 THERMOSTAT FUNCTION
On Board Diagnosis LogicINFOID:0000000003531731
Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long
enough.
This is due to a leak in the seal or the thermostat stuck open.
DTC Confirmation ProcedureINFOID:0000000003531732
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
•For best results, perform at ambient temperature of –10°C (14°F) or higher.
•For best results, perform at engine coolant temperature of –10°C (14°F) to 72°C (162°F).
WITH CONSULT-II
1. Replace thermostat with new one. Refer to CO-20 . Use only a genuine NISSAN thermostat as a replace-
ment. If an incorrect thermostat is used, the MIL may come on.
2. Turn ignition switch ON.
3. Select “COOLAN TEMP/S” in “DATA MONITOR” mode with CONSULT-II.
4. Check that the “COOLAN TEMP/S” is above 72°C (162°F).
If it is below 72°C (162°F), go to following step.
If it is above 72°C (162°F), cool down the engine to less than 72°C (162°F), then retry from step 1.
5. Drive vehicle for 10 consecutive minutes under the following conditions.
If 1st trip DTC is detected, go to EC-223, "
Diagnosis Procedure" .
WITH GST
1. Follow the procedure “WITH CONSULT-II” above.
Diagnosis ProcedureINFOID:0000000003531733
1.CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to EC-223, "
Component Inspection" .
OK or NG
OK >>INSPECTION END
NG >> Replace engine coolant temperature sensor.
Component InspectionINFOID:0000000003531734
ENGINE COOLANT TEMPERATURE SENSOR
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0128
0128Thermostat functionThe engine coolant temperature does not
reach to specified temperature even though
the engine has run long enough.•Thermostat
• Leakage from sealing portion of thermostat
• Engine coolant temperature sensor
VHCL SPEED SE 80 - 120 km/h (50 - 75 MPH)

Page 1307 of 3061

INFINITI QX56 2007 Factory Service Manual EC-224
< SERVICE INFORMATION >
DTC P0128 THERMOSTAT FUNCTION
1. Check resistance between engine coolant temperature sensor
terminals as shown in the figure.
<Reference data>
2. If NG, replace engine c

Page 1308 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0130, P0150 A/F SENSOR 1
EC-225
< SERVICE INFORMATION >
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DTC P0130, P0150 A/F SENSOR 1
Component DescriptionINFOID:0000000003531736
The air fuel ratio (A/F) sensor

DTC P0130, P0150 A/F SENSOR 1
EC-225
< SERVICE INFORMATION >
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DTC P0130, P0150 A/F SENSOR 1
Component DescriptionINFOID:0000000003531736
The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is composed an elec-
trode layer, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide range.
The exhaust gas components diffuse through the diffusion layer at
the sensor cell. An electrode layer is applied voltage, and this current
relative oxygen density in lean. Also this current relative hydrocar-
bon density in rich.
Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this
electrode layer of current. In addition, a heater is integrated in the
sensor to ensure the required operating temperature of about 800°C
(1,472°F).
CONSULT-II Reference Value in Data Monitor ModeINFOID:0000000003531737
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000003531738
To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1
signal fluctuates according to fuel feedback control.
DTC Confirmation ProcedureINFOID:0000000003531739
Perform PROCEDURE FOR MALFUNCTION A first.
If the DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
PROCEDURE FOR MALFUNCTION A
PBIB3353E
PBIB3354E
MONITOR ITEM CONDITION SPECIFICATION
A/F SEN1 (B1)
A/F SEN1 (B2)• Engine: After warming upMaintaining engine speed at
2,000 rpmFluctuates around 2.2V
DTC No. Trouble diagnosis name DTC detecting condition Possible Cause
P0130
0130
(Bank 1)
Air fuel ratio (A/F) sensor 1
circuitA)The A/F signal computed by ECM from the A/F
sensor 1 signal is constantly in the range other
than approx. 2.2V.• Harness or connectors
(The A/F sensor 1 circuit is open
or shorted.)
• Air fuel ratio (A/F) sensor 1 P0150
0150
(Bank 2)B)The A/F signal computed by ECM from the A/F
sensor 1 signal is constantly approx. 2.2V.

Page 1309 of 3061

INFINITI QX56 2007 Factory Service Manual EC-226
< SERVICE INFORMATION >
DTC P0130, P0150 A/F SENSOR 1
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Let

Page 1310 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0130, P0150 A/F SENSOR 1
EC-227
< SERVICE INFORMATION >
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8. Make sure that “TESTING” changes to “COMPLETED”.
If “TESTING” changed to “OUT OF CONDITION

Page 1311 of 3061

INFINITI QX56 2007 Factory Service Manual EC-228
< SERVICE INFORMATION >
DTC P0130, P0150 A/F SENSOR 1
Wiring Diagram
INFOID:0000000003531741
BANK 1
Specification data are reference values and are measured between each terminal and ground.
Pu

Page 1312 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0130, P0150 A/F SENSOR 1
EC-229
< SERVICE INFORMATION >
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Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the

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