Infiniti F50. Manual — part 465
DTC P1148, P1168 CLOSED LOOP CONTROL
EC-501
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EC
Overall Function Check
EBS00MJG
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.
Turn ignition switch “OFF” and wait at least 10 seconds,
3.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4.
Let engine idle for 1 minute.
5.
Set voltmeter probes between ECM terminal 114 [HO2S1 (B1)
signal] or 115 [HO2S1 (B2) signal] and engine ground.
6.
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.
7.
EC-501, "Diagnostic Procedure"
Diagnostic Procedure
EBS00MJH
Perform trouble diagnosis for “DTC P0133, P0153”. Refer to
.
PBIB0063E
EC-502
DTC P1211 TCS CONTROL UNIT
DTC P1211 TCS CONTROL UNIT
PFP:47850
Description
EBS00MJI
The malfunction information related to TCS is transferred through the CAN communication line from VDC/
TCS/ABS control unit to ECM.
Be sure to erase the malfunction information such as DTC not only for VDC/TCS/ABS control unit but
also for ECM after TCS related repair.
On Board Diagnosis Logic
EBS00MJJ
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 Procedure
EBS00MJK
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-502, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
Diagnostic Procedure
EBS00MJL
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1211
1211
TCS control unit
ECM receives a malfunction information from
VDC/TCS/ABS control unit.
●
VDC/TCS/ABS control unit
●
TCS related parts
SEF058Y
DTC P1212 TCS COMMUNICATION LINE
EC-503
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EC
DTC P1212 TCS COMMUNICATION LINE
PFP:47850
Description
EBS00MJM
NOTE:
If DTC P1212 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC U1000,
U1001. Refer to
EC-141, "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 VDC/TCS/ABS control unit.
Be sure to erase the malfunction information such as DTC not only for VDC/TCS/ABS control unit but
also for ECM after TCS related repair.
On Board Diagnosis Logic
EBS00MJN
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 Procedure
EBS00MJO
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
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
Diagnostic Procedure
EBS00MJP
1.
CHECK ABS ACTUATOR VDC/TCS/ABS CONTROL UNIT FUNCTION
Refer to
.
>> INSPECTION END
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1212
1212
TCS communication line
ECM can not receive the information from
VDC/TCS/ABS control unit continuously.
●
Harness or connectors
(The CAN communication line is open or
shorted.)
●
VDC/TCS/ABS control unit
●
Dead (Weak) battery
SEF058Y
EC-504
DTC P1217 ENGINE OVER TEMPERATURE
DTC P1217 ENGINE OVER TEMPERATURE
PFP:00000
Description
EBS00MJQ
If DTC P1217 is displayed with DTC P1119 or P1480, first perform the trouble diagnosis for DTC P1119
or P1480. Refer to
EC-430, "DTC P1119 RADIATOR COOLANT TEMPERATURE SENSOR"
"DTC P1480 COOLING FAN SPEED CONTROL SOLENOID VALVE"
SYSTEM DESCRIPTION
This system controls the cooling fan operating speed. The opening of the cooling fan speed control solenoid
valve changes to control oil pressure provided to the cooling fan drive pump.
This system consists of the cooling fan pump, cooling fan drive pump, cooling fan speed control solenoid
valve, oil cooler, cooling fan fluid reservoir, etc.
The cooling fan pump is operated by engine with the drive belts and provides oil pressure to the cooling fan
drive pump which operates the cooling fan. The cooling fan speed control solenoid valve is installed between
the cooling fan pump and cooling fan drive pump. The solenoid valve repeats ON/OFF operation according to
the signal sent from the ECM. The opening of the solenoid valve varies for optimum engine control. The opti-
mum value stored in the ECM is determined by considering various engine conditions.
COOLING FAN SPEED CONTROL
The ECM controls the cooling fan speed corresponding to the engine speed, the radiator coolant temperature,
refrigerant pressure, vehicle speed, air conditioner switch signal, etc.
The ECM determines the target fan speed based on the basic fan speed considering the radiator coolant tem-
perature and the engine speed. The ECM controls fan speed between 0 to 2,550 rpm.
When the cooling fan speed control solenoid valve is malfunctioning (does not operate), the cooling fan is
operated at the maximum speed by engine through the drive belts.
Cooling Fan Basic Speed
unit: rpm
PBIB0116E
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed
Cooling fan speed control
Cooling fan speed control
solenoid valve
Accelerator pedal position sensor
Accelerator pedal position
Radiator coolant temperature sensor
Radiator coolant temperature
Refrigerant pressure sensor
Refrigerant pressure
Wheel sensors (CAN communication)
Vehicle speed
A/C auto amp. (CAN communication)
Air conditioner switch signal
Air condi-
tioner
Refrigerant pressure
Vehicle speed
Less than 20 km/h
(12 MPH)
20 - 80 km/h
(12 - 50 MPH)
More than 80 km/h
(50 MPH)
OFF
-
300
300
300
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