Infiniti Q45. Manual - part 468

 

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Infiniti Q45. Manual - part 468

 

 

DTC P1148, P1168 CLOSED LOOP CONTROL

EC-511

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DTC P1148, P1168 CLOSED LOOP CONTROL

PFP:22690

On Board Diagnosis Logic

NBS002Y1

These self-diagnoses have the one trip detection logic.

DTC P1148 or P1168 is displayed with another DTC for A/F sensor 1.
Perform the trouble diagnosis for the corresponding DTC.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1148
1148
(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.

Harness or connectors
(The A/F sensor 1 circuit is open or 
shorted.)

A/F sensor 1

A/F sensor 1 heater

P1168
1168
(Bank 2)

The closed loop control function for bank 2 
does not operate even when vehicle is driving 
in the specified condition.

EC-512

DTC P1211 TCS CONTROL UNIT

DTC P1211 TCS CONTROL UNIT

PFP:47850

Description

NBS0021J

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

NBS0021K

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

NBS0021L

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-512, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure WITH CONSULT-II above.

Diagnostic Procedure

NBS0021M

Go to 

BRC-10, "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.

VDC/TCS/ABS control unit

TCS related parts

SEF058Y

DTC P1212 TCS COMMUNICATION LINE

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DTC P1212 TCS COMMUNICATION LINE

PFP:47850

Description

NBS0021N

NOTE:

If DTC P1212 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to 

EC-156, "DTC U1000, U1001 CAN COMMUNICATION LINE"

 .

If DTC P1212 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010.
Refer to 

EC-159, "DTC U1010 CAN COMMUNICATION"

 .

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

NBS0021O

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

NBS0021P

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 1st trip DTC is detected, go to 

EC-513, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure WITH CONSULT-II above.

Diagnostic Procedure

NBS0021Q

Refer to 

BRC-10, "TROUBLE DIAGNOSIS"

 .

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-514

DTC P1217 ENGINE OVER TEMPERATURE

DTC P1217 ENGINE OVER TEMPERATURE

PFP:00000

Description

NBS0021R

SYSTEM DESCRIPTION
Cooling Fan Control

*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to ECM through CAN communication line.

The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant
pressure, and air conditioner ON signal. The control system has 4-step control [HIGH/MIDDLE/LOW/OFF].

Cooling Fan Operation

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed*

1

Cooling fan 
control

Cooling fan relay

Battery

Battery voltage*

1

Wheel sensor

Vehicle speed*

2

Engine coolant temperature sensor

Engine coolant temperature

Air conditioner switch

Air conditioner ON signal

Refrigerant pressure sensor

Refrigerant pressure

PBIB2447E

 

 

 

 

 

 

 

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