Infiniti Q45. Manual — part 468
DTC P1148, P1168 CLOSED LOOP CONTROL
EC-511
C
D
E
F
G
H
I
J
K
L
M
A
EC
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
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-513
C
D
E
F
G
H
I
J
K
L
M
A
EC
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
.
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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