2005 INFINITI QX4 Factory Service Manual

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Page 1625 of 3419

INFINITI QX4 2005 Factory Service Manual EC-434Revision: October 2005
DTC P1147, P1167 HO2S2
2005 QX56
3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 2 harness connector.
3. D

Page 1626 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1147, P1167 HO2S2
EC-435
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Revision: October 20052005 QX56
5. CHECK HEATED OXYGEN SENSOR 2
Refer to EC-435, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
NG >> Replace

Page 1627 of 3419

INFINITI QX4 2005 Factory Service Manual EC-436Revision: October 2005
DTC P1147, P1167 HO2S2
2005 QX56
Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-43897-18 or J-43897-12 and ap

Page 1628 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1148, P1168 CLOSED LOOP CONTROL
EC-437
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Revision: October 20052005 QX56
DTC P1148, P1168 CLOSED LOOP CONTROLPFP:22690
On Board Diagnosis LogicUBS00H8K
These self-diagnose

Page 1629 of 3419

INFINITI QX4 2005 Factory Service Manual EC-438Revision: October 2005
DTC P1211 TCS CONTROL UNIT
2005 QX56
DTC P1211 TCS CONTROL UNITPFP:47850
DescriptionUBS00H8L
The malfunction information related to TCS is transferred through the CAN comm

Page 1630 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1212 TCS COMMUNICATION LINE
EC-439
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Revision: October 20052005 QX56
DTC P1212 TCS COMMUNICATION LINEPFP:47850
DescriptionUBS00H8P
NOTE:
If DTC P1212 is displayed with DTC

Page 1631 of 3419

INFINITI QX4 2005 Factory Service Manual EC-440Revision: October 2005
DTC P1217 ENGINE OVER TEMPERATURE
2005 QX56
DTC P1217 ENGINE OVER TEMPERATUREPFP:00000
DescriptionUBS00H8T
SYSTEM DESCRIPTION
NOTE:
If DTC P1217 is displayed with DTC U100

Page 1632 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1217 ENGINE OVER TEMPERATURE
EC-441
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Revision: October 20052005 QX56
On Board Diagnosis LogicUBS00H8V
If the cooling fan or another component in the cooling system malfun

DTC P1217 ENGINE OVER TEMPERATURE
EC-441
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Revision: October 20052005 QX56
On Board Diagnosis LogicUBS00H8V
If the cooling fan or another component in the cooling system malfunctions, engine coolant temperature will
rise.
When the engine coolant temperature reaches an abnormally high temperature condition, a malfunction is
indicated.
This self-diagnosis has the one trip detection logic.
CAUTION:
When a malfunction is indicated, be sure to replace the coolant. Refer to CO-10, "
Changing Engine
Coolant" . Also, replace the engine oil. Refer to LU-8, "Changing Engine Oil" .
1. Fill radiator with coolant up to specified level with a filling speed of 2 liters per minute. Be sure to
use coolant with the proper mixture ratio. Refer to MA-12, "
ANTI-FREEZE COOLANT MIXTURE
RATIO" .
2. After refilling coolant, run engine to ensure that no water-flow noise is emitted.
Overall Function CheckUBS00H8W
Use this procedure to check the overall function of the cooling fan. During this check, a DTC might not be con-
firmed.
WA RN ING:
Never remove the radiator cap when the engine is hot. Serious burns could be caused by high pres-
sure fluid escaping from the radiator.
Wrap a thick cloth around cap. Carefully remove the cap by turning it a quarter turn to allow built-up
pressure to escape. Then turn the cap all the way off.
WITH CONSULT-II
1. Check the coolant level in the reservoir tank and radiator.
Allow engine to cool before checking coolant level.
If the coolant level in the reservoir tank and/or radiator is below
the proper range, skip the following steps and go to EC-445,
"Diagnostic Procedure" .
2. Confirm whether customer filled the coolant or not. If customer
filled the coolant, skip the following steps and go to EC-445,
"Diagnostic Procedure" .
3. Turn ignition switch ON.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1217
1217Engine over tempera-
ture (Overheat)
Cooling fan does not operate properly (Over-
heat).
Cooling fan system does not operate prop-
erly (Overheat).
Engine coolant was not added to the system
using the proper filling method.
Engine coolant is not within the specified
range.
Harness or connectors
(The cooling fan circuit is open or
shorted.)
Cooling fan
IPDM E/R (Cooling fan relay)
Radiator hose
Radiator
Radiator cap
Water pump
Thermostat
For more information, refer to EC-448,
"Main 12 Causes of Overheating" .
SEF 6 21 W

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