2005 INFINITI FX35 Ignition switch

DTC P1148, P1168 CLOSED LOOP CONTROL EC-1209
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Revision: 2005 July 2005 FX
DTC P1148, P1168 CLOSED LOOP CONTROLPFP:22690
On Board Diagnosis LogicABS007SE
These self-diagnoses have the one trip detection logic.
DTC Confirmation Procedure (Up To Serial 400595 Except for Serial 400590)ABS007SF
CAUTION:
Always drive vehicle at a safe speed.
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:

Do not raise engine speed above 3,000 rpm during the DTC Confirmation Procedure. If the engine
speed limit is exceeded, retry the procedure from step 2.

Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Hold engine speed at 2,000 rpm and check one of the following.

“HO2S1 (B1)/(B2)” voltage should go above 0.70V at least
once.

“HO2S1 (B1)/(B2)” voltage should go below 0.21V at least
once.
If the check result is NG, perform EC-1210, "
Diagnostic Pro-
cedure" .
If the check result is OK, perform the following step.
4. Let engine idle at least 5 minutes.
5. Maintain the following condition at least 50 consecutive sec- onds.
During this test, P0132 and/or P0152 may be displayed on CONSULT-II screen.
6. If DTC is detected, go to EC-1210, "
Diagnostic Procedure" .
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1148
11 4 8
(Bank 1) Closed loop control
function The closed loop control function for bank 1
does not operate even when vehicle is driving
in the specified condition.

The heated oxygen sensor 1 circuit is
open or shorted.

Heated oxygen sensor 1

Heated oxygen sensor heater
P1168
11 6 8
(Bank 2) The closed loop control function for bank 2
does not operate even when vehicle is driving
in the specified condition.
B/FUEL SCHDL 4.0 msec or more
ENG SPEED More than 1,300 rpm
Selector lever Suitable position
VHCL SPEED SE More than 70 km/h (43 MPH)
SEC011C

EC-1210
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DTC P1148, P1168 CLOSED LOOP CONTROL
Revision: 2005 July 2005 FX
DTC Confirmation Procedure (For Serial 400590 and From Serial 400596)ABS00FPN
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.
WITH CONSULT-II
1. Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.
2. Start engine and warm it up to normal operating temperature.
3. Turn ignition switch OFF ant wait at least 10 seconds.
4. Start engine and let it idle for at least 2 minutes.
5. If DTC is detected, go to EC-1210, "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II” above.
Overall Function Check (Up To Serial 400595 Except for Serial 400590)ABS007SG
Use this procedure to check the overall function of the closed loop control. During this check, a DTC might not
be confirmed.
WITH GST
1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes between ECM terminal 16 [HO2S1 (B1) signal] or 35 [HO2S1 (B2) signal] and ground.
3. Check the following with engine speed held at 2,000 rpm con- stant under no load.

The voltage should go above 0.70V at least once.

The voltage should go below 0.21V at least once.
4. If NG, go to EC-1210, "
Diagnostic Procedure" .
Diagnostic ProcedureABS007SH
Perform trouble diagnosis for DTC P0133, P0153. Refer to EC-950, "Diagnostic Procedure" .
SEF174Y
PBIB1528E

DTC P1211 TCS CONTROL UNIT EC-1211
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Revision: 2005 July 2005 FX
DTC P1211 TCS CONTROL UNITPFP:47850
DescriptionABS007SI
The malfunction information related to TCS is transferred through the CAN communication line from “ABS
actuator and electric unit (control unit)” to ECM.
Be sure to erase the malfunction information such as DTC not only for “ABS actuator and electric unit
(control unit)” but also for ECM after TCS related repair.
On Board Diagnosis LogicABS007SJ
Freeze frame data is not stored in the ECM for this self-diagnosis. The MIL will not light up for this self-
diagnosis.
DTC Confirmation ProcedureABS007SK
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5V at idle.
WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and let it idle for at least 60 seconds.
4. If 1st trip DTC is detected, go to EC-1211, "
Diagnostic Proce-
dure" .
WITH GST
Follow the procedure “WITH CONSULT-II” above.
Diagnostic ProcedureABS007SL
Go to BRC-12, "TROUBLE DIAGNOSIS" .
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1211
1211 TCS control unit ECM receives a malfunction information from
“ABS actuator electric unit (control unit)”

ABS actuator and electric unit (control
unit)

TCS related parts
SEF058Y

EC-1212
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DTC P1212 TCS COMMUNICATION LINE
Revision: 2005 July 2005 FX
DTC P1212 TCS COMMUNICATION LINEPFP:47850
DescriptionABS007SM
NOTE:
If DTC P1212 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC U1000,
U1001. Refer to EC-862, "
DTC U1000, U1001 CAN COMMUNICATION LINE" .
This CAN communication line is used to control the smooth engine operation during the TCS operation. Pulse
signals are exchanged between ECM and “ABS actuator and electric unit (control unit)”.
Be sure to erase the malfunction information such as DTC not only for “ABS actuator and electric unit
(control unit)” but also for ECM after TCS related repair.
On Board Diagnosis LogicABS007SN
Freeze frame data is not stored in the ECM for this self-diagnosis. The MIL will not light up for this self-
diagnosis.
DTC Confirmation ProcedureABS007SO
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5V at idle.
WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and let it idle for at least 10 seconds.
4. If a 1st trip DTC is detected, go to EC-1212, "
Diagnostic Proce-
dure" .
WITH GST
Follow the procedure “WITH CONSULT-II” above.
Diagnostic ProcedureABS007SP
Go to BRC-12, "TROUBLE DIAGNOSIS" .
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1212
1212 TCS communication
line ECM can not receive the information
from “ABS actuator and electric unit (con-
trol unit)” continuously.

Harness or connectors
(The CAN communication line is open or
shorted.)

ABS actuator and electric unit (control unit)

Dead (Weak) battery
SEF058Y

DTC P1217 ENGINE OVER TEMPERATURE EC-1215
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Revision: 2005 July 2005 FX
Overall Function CheckABS007ST
Use this procedure to check the overall function of the cooling fan. During this check, a DTC might not be con-
firmed.
WARNING:
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-1219,
"Diagnostic Procedure" .
2. Confirm whether customer filled the coolant or not. If customer filled the coolant, skip the following steps and go to EC-1219,
"Diagnostic Procedure" .
3. Turn ignition switch ON.
4. Perform “COOLING FAN” in “ACTIVE TEST” mode with CON- SULT-II.
5. If the results are NG, go to EC-1219, "
Diagnostic Procedure" .
WITH GST
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-1219,
"Diagnostic Procedure" .
2. Confirm whether customer filled the coolant or not. If customer filled the coolant, skip the following steps and go to EC-1219,
"Diagnostic Procedure" .
3. Disconnect engine coolant temperature sensor harness connec- tor.
4. Connect 200 Ω resister to the engine coolant temperature sensor
harness connector.
5. Start engine and make sure that cooling fan operates at middle speed.
Be careful not to overheat engine.
If NG, go to EC-1219, "
Diagnostic Procedure" .
If OK, go to the following step.
6. Turn ignition switch OFF.
7. Disconnect 200 Ω resister from engine coolant temperature sen-
sor harness connector.
SEF621W
SEF646X
SEF621W
PBIB0965E

DTC P1217 ENGINE OVER TEMPERATURE EC-1221
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Revision: 2005 July 2005 FX
7. CHECK RADIATOR CAP
Apply pressure to cap with a tester.
OK or NG
OK >> GO TO 8.
NG >> Replace radiator cap.
8. CHECK COMPONENT PARTS
Check the following.

Thermostat. (Refer to CO-53, "THERMOSTAT AND WATER CONTROL VALVE" .)

Water control valve. (Refer to CO-53, "THERMOSTAT AND WATER CONTROL VALVE" .)

Engine coolant temperature sensor. (Refer to EC-919, "Component Inspection" .)
OK or NG
OK >> GO TO 9.
NG >> Replace malfunctioning component.
9. CHECK MAIN 13 CAUSES
If the cause cannot be isolated, go to EC-1223, "
Main 13 Causes of Overheating" .
>> INSPECTION END
PROCEDURE A
1. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector E6.
3. Check voltage between IPDM E/R terminal 16 and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2. DETECT MALFUNCTIONING PART
Check the following.

40A fusible link

Harness for open or short between IPDM E/R and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
Radiator cap
relief pressure: 59 - 98 kPa (0.6 - 1.0 kg/cm
2 , 9 - 14 psi)
SLC755A
Voltage: Battery voltage
PBIB0966E

EC-1224
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DTC P1217 ENGINE OVER TEMPERATURE
Revision: 2005 July 2005 FX
*1: Turn the ignition switch ON.
*2: Engine running at 3,000 rpm for 10 minutes.
*3: Drive at 90 km/h (55 MPH) for 30 minutes and then let idle for 10 minutes.
*4: After 60 minutes of cool down time.
For more information, refer to CO-33, "
OVERHEATING CAUSE ANALYSIS" .
Component InspectionABS007SX
COOLING FAN MOTOR
1. Disconnect cooling fan motor harness connector.
2. Supply cooling fan motor terminals with battery voltage and check operation.
Cooling fan motor should operate.
If NG, replace cooling fan motor.
ON*39
Coolant temperature
gauge
Visual Gauge less than 3/4 when driving —

Coolant overflow to
reservoir tank
Visual No overflow during driving and idling CO-37
OFF*410
Coolant return from
reservoir tank to radia-
tor
Visual Should be initial level in reservoir tank CO-37
OFF 11
Water control valve
Remove and inspect
the valve Within the specified value
CO-53
OFF 12
Cylinder head
Straight gauge feeler
gauge 0.1 mm (0.004 in) Maxi-
mum distortion (warping) EM-229
13
Cylinder block and pis-
tons
Visual No scuffing on cylinder walls or piston EM-245
Engine Step Inspection item Equipment Standard Reference page
Speed
Terminals
(+) ( −)
Cooling fan motor Middle
1 3 and 4
2 3 and 4
High 1, 2 3, 4
SEF321T

DTC P1225 TP SENSOR EC-1225
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Revision: 2005 July 2005 FX
DTC P1225 TP SENSORPFP:16119
Component DescriptionABS007T5
Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has the two sensors. These sensors are
a kind of potentiometers which transform the throttle valve position
into output voltage, and emit the voltage signal to the ECM. In addi-
tion, these sensors detect the opening and closing speed of the
throttle valve and feed the voltage signals to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and the ECM controls the throttle control motor to make the
throttle valve opening angle properly in response to driving condi-
tion.
On Board Diagnosis LogicABS007T6
The MIL will not light up for this diagnosis.
DTC Confirmation ProcedureABS007T7
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 10V at idle.
WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Turn ignition switch OFF, wait at least 10 seconds.
4. Turn ignition switch ON.
5. If 1st trip DTC is detected, go to EC-1226, "
Diagnostic Proce-
dure" .
WITH GST
Follow the procedure “WITH CONSULT-II” above.
PBIB0145E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1225
1225 Closed throttle position
learning performance
problem Closed throttle position learning value is exces-
sively low.

Electric throttle control actuator
(TP sensor 1 and 2)
SEF058Y