Nissan Primera P12. Instruction — part 271
DTC P1260 - P1267 FUEL INJECTOR ADJUSTMENT RESISTOR
EC-269
[YD (WITH EURO-OBD)]
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EC
Diagnostic Procedure
EBS013QW
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten engine ground screws. Refer to
.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK FUEL INJECTOR ADJUSTMENT RESISTOR POWER SUPPLY CIRCUIT
1.
Disconnect fuel injector harness connector of malfunctioning
cylinder.
2.
Turn ignition switch ON.
3.
Check voltage between fuel injector terminal 2 and ground with
CONSULT-II or tester.
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 ADJUSTMENT RESISTOR GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between fuel injector terminal 1 and ECM terminal 78.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
MBIB0915E
MBIB0085E
Voltage: Approximately 5.3V
MBIB0186E
Continuity should exist.
EC-270
[YD (WITH EURO-OBD)]
DTC P1260 - P1267 FUEL INJECTOR ADJUSTMENT RESISTOR
4.
CHECK FUEL INJECTOR ADJUSTMENT RESISTOR
Refer to
EC-270, "Component Inspection"
.
OK or NG
OK
>> GO TO 5.
NG
>> Replace fuel injector.
5.
CHECK INTERMITTENT INCIDENT
Refer to
EC-75, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
Component Inspection
EBS013QX
FUEL INJECTOR ADJUSTMENT RESISTOR
1.
Disconnect fuel injector harness connector.
2.
Check continuity between terminals as shown in the figure.
If NG, replace fuel injector.
Removal and Installation
EBS013QY
FUEL INJECTOR
Refer to
EM-39, "INJECTION TUBE AND FUEL INJECTOR"
Continuity should exist.
PBIB0415E
DTC P1268 - P1271 FUEL INJECTOR
EC-271
[YD (WITH EURO-OBD)]
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EC
DTC P1268 - P1271 FUEL INJECTOR
PFP:16600
Component Description
EBS013QZ
The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the fuel injector circuit, the coil in the fuel injec-
tor is energized. The energized coil pulls the needle valve back and
allows fuel to flow through the fuel injector into the intake cylinder.
The amount of fuel injected depends upon the injection pulse dura-
tion. Pulse duration is the length of time the fuel injector remains
open. The ECM controls the injection pulse duration based on
engine fuel needs.
CONSULT-II Reference Value in Data Monitor Mode
EBS013R0
Specification data are reference values.
ECM Terminals and Reference Value
EBS013R1
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
PBIB0465E
MONITOR ITEM
CONDITION
SPECIFICATION
MAIN INJ WID
●
Engine: After warming up
●
Shift lever: Neutral position
●
Idle speed
No-load
0.68 - 0.78 msec
Blower fan switch: ON
Rear window defogger switch: ON
0.78 - 0.88 msec
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC Voltage and Pulse Signal)
4
5
O/B
B
Fuel injector power supply
(For cylinder No. 1 and 4)
Fuel injector power supply
(For cylinder No. 2 and 3)
[Engine is running]
●
Warm-up condition
●
Idle speed
5 - 10V
[Engine is running]
●
Warm-up condition
●
Engine speed is 2,000 rpm
5 - 10V
MBIB0883E
MBIB0884E
EC-272
[YD (WITH EURO-OBD)]
DTC P1268 - P1271 FUEL INJECTOR
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
On Board Diagnosis Logic
EBS013R2
This self-diagnosis has the one trip detection logic.
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.
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