Nissan Primera P12. Manual — part 346
DTC P1268 - P1271 FUEL INJECTOR
EC-569
[YD (WITHOUT EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
On Board Diagnosis Logic
EBS015AF
The MI will not light up for these self-diagnoses.
21
22
23
24
L
L
W
W
Fuel injector No. 2
Fuel injector No. 2
Fuel injector No. 3
Fuel injector No. 3
[Engine is running]
●
Warm-up condition
●
Idle speed
0 - 9V
[Engine is running]
●
Warm-up condition
●
Engine speed is 2,000 rpm
0 - 9V
40
41
42
43
B/P
B/P
PU/G
PU/G
Fuel injector No. 4
Fuel injector No. 4
Fuel injector No. 1
Fuel injector No. 1
[Engine is running]
●
Warm-up condition
●
Idle speed
0 - 9V
[Engine is running]
●
Warm-up condition
●
Engine speed is 2,000 rpm
0 - 9V
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC Voltage and Pulse Signal)
MBIB0881E
MBIB0882E
MBIB0881E
MBIB0882E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1268
No. 1 cylinder fuel injector
The valve built into No. 1 cylinder fuel injector is
not closed properly (stuck open) when the injec-
tor is not energized.
●
Fuel injector
P1269
No. 2 cylinder fuel injector
The valve built into No. 2 cylinder fuel injector is
not closed properly (stuck open) when the injec-
tor is not energized.
P1270
No. 3 cylinder fuel injector
The valve built into No. 3 cylinder fuel injector is
not closed properly (stuck open) when the injec-
tor is not energized.
P1271
No. 4 cylinder fuel injector
The valve built into No. 4 cylinder fuel injector is
not closed properly (stuck open) when the injec-
tor is not energized.
EC-570
[YD (WITHOUT EURO-OBD)]
DTC P1268 - P1271 FUEL INJECTOR
DTC Confirmation Procedure
EBS015AG
CAUTION:
Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws when driv-
ing.
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.
WITH CONSULT-II
1.
Turn ignition switch ON, and select “DATA MONITOR” mode
with CONSULT-II.
2.
Restart engine and let it idle for about 15 minutes.
3.
If DTC is detected, go to
EC-572, "Diagnostic Procedure"
.
If DTC is not detected, go to next step.
4.
Drive vehicle and maintain the following conditions for at least
60 seconds.
5.
If DTC is detected, go to
EC-572, "Diagnostic Procedure"
.
CKPS·RPM
700 - 2000 rpm (A constant rotation is maintained)
COOLAN TEMP/S
Less than 75
°
C (167
°
F)
Shift lever
Suitable position
Accelerator pedal
Hold the accelerator pedal as steady as possible.
PBIB2156E
DTC P1268 - P1271 FUEL INJECTOR
EC-571
[YD (WITHOUT EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Wiring Diagram
EBS015AH
MBWA0634E
EC-572
[YD (WITHOUT EURO-OBD)]
DTC P1268 - P1271 FUEL INJECTOR
Diagnostic Procedure
EBS015AI
1.
CHECK FUEL INJECOR POWER SUPPLY CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Disconnect fuel injector harness connector.
4.
Check harness continuity between the following terminals corre-
sponding to the malfunctioning cylinder. Refer to Wiring Dia-
gram.
5.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 2.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
2.
CHECK ECM OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check harness continuity between the following terminals corresponding to the malfunctioning cylinder.
Refer to Wiring Diagram.
2.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 3.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
3.
CHECK FUEL INJECTOR-I
Refer to
EC-573, "Component Inspection"
.
OK or NG
OK
>> GO TO 4.
NG
>> Replace fuel injector.
DTC
Terminal
Cylinder
ECM
Fuel injector
P1268
4
3
No.1
P1269
5
3
No.2
P1270
5
3
No.3
P1271
4
3
No.4
Continuity should exist.
MBIB0085E
DTC
Terminal
Cylinder
ECM
Fuel injector
P1268
42, 43
4
No.1
P1269
21, 22
4
No.2
P1270
23, 24
4
No.3
P1271
40, 41
4
No.4
Continuity should exist.
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