NISSAN X-TRAIL 2003 Service Repair Manual

DTC P2146, P2149 FUEL INJECTOR POWER SUPPLY
EC-1443
[YD (WITHOUT EURO-OBD)]
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DTC P2146, P2149 FUEL INJECTOR POWER SUPPLYPFP:16600
Component DescriptionEBS0124X
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 cylinder. The
amount of fuel injected depends upon the injection pulse duration.
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 ModeEBS0124Y
Specification data are reference values.
ECM Terminals and Reference ValueEBS0124Z
Specification data are reference values and are measured between each terminal and ground.
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 speedNo-load 0.68 - 0.78 msec
Blower fan switch: ON
Rear window defogger switch: ON0.78 - 0.88 msec
TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
4
5W/B
G/BFuel 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 speed5 - 10V
[Engine is running]

Warm-up condition

Engine speed is 2,000 rpm5 - 10V
MBIB0883E
MBIB0884E

EC-1444
[YD (WITHOUT EURO-OBD)]
DTC P2146, P2149 FUEL INJECTOR POWER SUPPLY

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
On Board Diagnosis LogicEBS01250
21
22
23
24G/R
GY/L
G/R
GY/LFuel injector No. 2
Fuel injector No. 2
Fuel injector No. 3
Fuel injector No. 3[Engine is running]

Warm-up condition

Idle speed0 - 9V
[Engine is running]

Warm-up condition

Engine speed is 2,000 rpm0 - 9V
40
41
42
43G/R
GY/L
G/R
GY/LFuel injector No. 4
Fuel injector No. 4
Fuel injector No. 1
Fuel injector No. 1[Engine is running]

Warm-up condition

Idle speed0 - 9V
G/R
[Engine is running]

Warm-up condition

Engine speed is 2,000 rpm0 - 9V TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
MBIB0881E
MBIB0882E
MBIB0882E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2146No. 1 and 4 cylinder fuel
injector power supply cir-
cuit openAn improper voltage signal is sent to ECM
through No. 1 and 4 cylinder fuel injector.

Harness or connectors
(The fuel injector circuit is open.)
P2149No. 2 and 3 cylinder fuel
injector power supply cir-
cuit openAn improper voltage signal is sent to ECM
through No. 2 and 3 cylinder fuel injector.

DTC P2146, P2149 FUEL INJECTOR POWER SUPPLY
EC-1445
[YD (WITHOUT EURO-OBD)]
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DTC Confirmation ProcedureEBS01251
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
Before performing the following procedure, confirm the ambient temperature is more than -20°C (-4°F).
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 5 seconds.
4. If 1st trip DTC is detected, go to EC-1447, "
Diagnostic Proce-
dure" .
SEF817Y

EC-1446
[YD (WITHOUT EURO-OBD)]
DTC P2146, P2149 FUEL INJECTOR POWER SUPPLY

Wiring DiagramEBS01252
TBWA0733E

DTC P2146, P2149 FUEL INJECTOR POWER SUPPLY
EC-1447
[YD (WITHOUT EURO-OBD)]
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Diagnostic ProcedureEBS01253
1. CHECK FUEL INJECOR POWER 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 Diagram.
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 INTERMITTENT INCIDENT
Refer to EC-1260, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Te r m i n a l
Cylinder
ECM Fuel injector
43No.1
53No.2
53No.3
43No.4
Continuity should exist.
PBIB1896E

EC-1448
[YD (WITHOUT EURO-OBD)]
DTC P2147, P2148 FUEL INJECTOR CIRCUIT

DTC P2147, P2148 FUEL INJECTOR CIRCUITPFP:16600
Component DescriptionEBS01254
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 ModeEBS01255
Specification data are reference values.
ECM Terminals and Reference ValueEBS01256
Specification data are reference values and are measured between each terminal and ground.
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 speedNo-load 0.68 - 0.78 msec
Blower fan switch: ON
Rear window defogger switch: ON0.78 - 0.88 msec
TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
4
5W/B
G/BFuel 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 speed5 - 10V
[Engine is running]

Warm-up condition

Engine speed is 2,000 rpm5 - 10V
MBIB0883E
MBIB0884E

DTC P2147, P2148 FUEL INJECTOR CIRCUIT
EC-1449
[YD (WITHOUT EURO-OBD)]
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: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
On Board Diagnosis LogicEBS01257
DTC Confirmation ProcedureEBS01258
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.
21
22
23
24G/R
GY/L
G/R
GY/LFuel injector No. 2
Fuel injector No. 2
Fuel injector No. 3
Fuel injector No. 3[Engine is running]

Warm-up condition

Idle speed0 - 9V
[Engine is running]

Warm-up condition

Engine speed is 2,000 rpm0 - 9V
40
41
42
43G/R
GY/L
G/R
GY/LFuel injector No. 4
Fuel injector No. 4
Fuel injector No. 1
Fuel injector No. 1[Engine is running]

Warm-up condition

Idle speed0 - 9V
[Engine is running]

Warm-up condition

Engine speed is 2,000 rpm0 - 9V TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
MBIB0881E
MBIB0882E
MBIB0881E
MBIB0882E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2147Fuel injector circuit low
inputECM detects the fuel injector circuit is shorted to
ground.

Harness or connectors
(The fuel injector circuit is shorted.)
P2148Fuel injector circuit high
inputECM detects the fuel injector circuit is shorted to
power.

EC-1450
[YD (WITHOUT EURO-OBD)]
DTC P2147, P2148 FUEL INJECTOR CIRCUIT

2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and let it idle for at least 5 seconds.
4. If 1st trip DTC is detected, go to EC-1452, "
Diagnostic Proce-
dure" .
SEF817Y

DTC P2147, P2148 FUEL INJECTOR CIRCUIT
EC-1451
[YD (WITHOUT EURO-OBD)]
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Wiring DiagramEBS01259
TBWA0569E

EC-1452
[YD (WITHOUT EURO-OBD)]
DTC P2147, P2148 FUEL INJECTOR CIRCUIT

Diagnostic ProcedureEBS0125A
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten engine ground screws. Refer to EC-1267, "
Ground Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
PBIB2020E