Infiniti M45 (Y34). Manual — part 454
DTC P1148, P1168 CLOSED LOOP CONTROL
EC-505
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EC
DTC P1148, P1168 CLOSED LOOP CONTROL
PFP:22690
On Board Diagnosis Logic
ABS002P7
These self-diagnoses have the one trip detection logic.
DTC Confirmation Procedure
ABS002P8
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:
●
Never 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.
Turn ignition switch OFF and wait at least 10 seconds,
3.
Select “DATA MONITOR” mode with CONSULT-II.
4.
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
.
If the check result is OK, perform the following step.
5.
Let engine idle at least 5 minutes.
6.
Maintain the following condition at least 50 consecutive sec-
onds.
During this test, P0132 and/or P0152 may be displayed on CONSULT-II screen.
7.
EC-506, "Diagnostic Procedure"
.
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.
●
The heated oxygen sensor 1 circuit is
open or shorted.
●
Heated oxygen sensor 1
●
Heated oxygen 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.
B/FUEL SCHDL
4.0 msec or more
ENG SPEED
More than 1,300 rpm
Selector lever
Suitable position
VHCL SPEED SE
More than 71 km/h (44 MPH)
PBIB2025E
EC-506
DTC P1148, P1168 CLOSED LOOP CONTROL
Overall Function Check
ABS002P9
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 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-506, "Diagnostic Procedure"
Diagnostic Procedure
ABS002PA
Perform trouble diagnosis for “DTC P0133, P0153”. Refer to
.
PBIB0063E
DTC P1211 TCS CONTROL UNIT
EC-507
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EC
DTC P1211 TCS CONTROL UNIT
PFP:47850
Description
ABS002PB
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
ABS002PC
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
ABS002PD
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-507, "Diagnostic Procedure"
.
WITH GST
Follow the procedure WITH CONSULT-II above.
Diagnostic Procedure
ABS002PE
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
EC-508
DTC P1212 TCS COMMUNICATION LINE
DTC P1212 TCS COMMUNICATION LINE
PFP:47850
Description
ABS002PF
NOTE:
If DTC P1212 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC U1000,
U1001. Refer to
EC-143, "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
ABS002PG
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
ABS002PH
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
ABS002PI
.
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
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