Infiniti F50. Manual - part 465

DTC P1148, P1168 CLOSED LOOP CONTROL

EC-501

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Overall Function Check

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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.

If NG, go to 

EC-501, "Diagnostic Procedure"

 .

Diagnostic Procedure

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Perform trouble diagnosis for “DTC P0133, P0153”. Refer to 

EC-221

 .

PBIB0063E

EC-502

DTC P1211 TCS CONTROL UNIT

DTC P1211 TCS CONTROL UNIT

PFP:47850

Description

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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

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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

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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

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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 
VDC/TCS/ABS control unit.

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VDC/TCS/ABS control unit

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TCS related parts

SEF058Y

DTC P1212 TCS COMMUNICATION LINE

EC-503

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DTC P1212 TCS COMMUNICATION LINE

PFP:47850

Description

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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

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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

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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-503, "Diagnostic Proce-

dure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

Diagnostic Procedure

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1. 

CHECK ABS ACTUATOR VDC/TCS/ABS CONTROL UNIT FUNCTION

Refer to 

BRC-12, "TROUBLE DIAGNOSIS"

 .

>> 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.)

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VDC/TCS/ABS control unit

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Dead (Weak) battery

SEF058Y

EC-504

DTC P1217 ENGINE OVER TEMPERATURE

DTC P1217 ENGINE OVER TEMPERATURE

PFP:00000

Description

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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"

  or 

EC-571,

"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

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