Nissan Pathfinder (2005 year). Instruction — part 229
INJECTOR CIRCUIT
EC-683
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EC
2005 Pathfinder
5.
CHECK FUNCTION OF INJECTOR-II
Provide battery voltage between harness connector F101 as follows
and then interrupt it. Listen to each injector operating sound.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 7.
6.
CHECK FUNCTION OF INJECTOR-III
1.
Reconnect all harness connector disconnected.
2.
Start engine.
3.
Listen to injectors No. 2, No. 4, No.6 operating sound.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 7.
Cylinder
Harness connector F101 terminal
(+)
(–)
1
3
2
3
3
1
5
3
4
Operating sound should exist.
PBIB2634E
Clicking noise should exist.
PBIB1986E
EC-684
INJECTOR CIRCUIT
2005 Pathfinder
7.
CHECK INJECTOR POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect injector harness connector.
3.
Turn ignition switch ON.
4.
Check voltage between injector terminal 1 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 9.
NG
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E2, F32
●
Harness connectors F44, F101
●
IPDM E/R harness connector E119
●
15A fuse
●
Harness for open or short between injector and fuse
>> Repair harness or connectors.
9.
CHECK INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between injector terminal 2 and ECM terminals 21, 22, 23, 40, 41, 42.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 10.
BBIA0546E
Voltage: Battery voltage
PBIB0582E
Continuity should exist.
INJECTOR CIRCUIT
EC-685
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EC
2005 Pathfinder
10.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F101, F44
●
Harness for open or short between injector and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
11.
CHECK INJECTOR
Refer to
EC-685, "Component Inspection"
.
OK or NG
OK
>> GO TO 12.
NG
>> Replace injector.
12.
CHECK INTERMITTENT INCIDENT
Refer to
EC-158, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
Component Inspection
UBS00KIA
INJECTOR
1.
Disconnect injector harness connector.
2.
Check resistance between terminals as shown in the figure.
Removal and Installation
UBS00KIB
INJECTOR
Refer to
EM-34, "FUEL INJECTOR AND FUEL TUBE"
.
Resistance: 11.1 - 14.5
Ω
[at 10 - 60
°
C (50 - 140
°
F)]
PBIB1727E
EC-686
FUEL PUMP CIRCUIT
2005 Pathfinder
FUEL PUMP CIRCUIT
PFP:17042
Description
UBS00KIC
SYSTEM DESCRIPTION
*: ECM determines the start signal status by the signals of engine speed and battery voltage.
The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine
start ability. If the ECM receives a engine speed signal from the camshaft position sensor (PHASE), it knows
that the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when
the ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging,
thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump
relay, which in turn controls the fuel pump.
COMPONENT DESCRIPTION
A turbine type design fuel pump is used in the fuel tank.
CONSULT-II Reference Value in Data Monitor Mode
UBS00KID
Specification data are reference values.
Sensor
Input Signal to ECM
ECM Function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed*
Fuel pump control
Fuel pump relay
Battery
Battery voltage*
Condition
Fuel pump operation
Ignition switch is turned to ON.
Operates for 1 second.
Engine running and cranking
Operates.
When engine is stopped
Stops in 1.5 seconds.
Except as shown above
Stops.
PBIB1569E
MONITOR ITEM
CONDITION
SPECIFICATION
FUEL PUMP RLY
●
For 1 second after turning ignition switch ON
●
Engine running or cranking
ON
●
Except above conditions
OFF
FUEL PUMP CIRCUIT
EC-687
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2005 Pathfinder
Wiring Diagram
UBS00KIE
BBWA1775E
EC-688
FUEL PUMP CIRCUIT
2005 Pathfinder
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.
Diagnostic Procedure
UBS00KIF
1.
CHECK OVERALL FUNCTION
1.
Turn ignition switch ON.
2.
Pinch fuel feed hose with two fingers.
Fuel pressure pulsation should be felt on the fuel feed hose
for 1 second after ignition switch is turned ON.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
2.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Turn ignition switch ON.
4.
Check voltage between ECM terminal 113 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 3.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
113
Y
Fuel pump relay
[Ignition switch: ON]
●
For 1 second after turning ignition switch ON
[Engine is running]
0 - 1.5V
[Ignition switch: ON]
●
More than 1 second after turning ignition
switch ON
BATTERY VOLTAGE
(11 - 14V)
BBIA0563E
Voltage: Battery voltage
PBIB1187E
FUEL PUMP CIRCUIT
EC-689
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EC
2005 Pathfinder
3.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II
Check voltage between IPDM E/R terminal 46 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 10.
4.
DETECT MALFUNCTIONING PART
Check harness for open or short between IPDM E/R and ECM
>> Repair harness or connectors.
5.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III
1.
Turn ignition switch OFF.
2.
Reconnect all harness connectors disconnected.
3.
Disconnect IPDM E/R harness connector E122.
4.
Turn ignition switch ON.
5.
Check voltage between IPDM E/R terminal 13 and ground with
CONSULT-II or tester.
6.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 6.
6.
CHECK 15A FUSE
1.
Turn ignition switch OFF.
2.
Disconnect 15A fuse.
3.
Check 15A fuse.
OK or NG
OK
>> GO TO 10.
NG
>> Replace fuse.
Voltage: Battery voltage
PBIB2612E
Voltage:
Battery voltage should exist for 1 sec-
ond after ignition switch is turned ON.
PBIB2614E
EC-690
FUEL PUMP CIRCUIT
2005 Pathfinder
7.
CHECK FUEL PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.
3.
Check harness continuity between “fuel level sensor unit and
fuel pump” terminal 1 and harness IPDM E/R terminal 13, “fuel
level sensor unit and fuel pump” terminal 3 and ground.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 9.
NG
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors C1, E41
●
Harness for open or short between “fuel level sensor unit and fuel pump” and IPDM E/R
●
Harness for open or short between “fuel level sensor unit and fuel pump” and ground
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.
CHECK FUEL PUMP
Refer to
EC-690, "Component Inspection"
.
OK or NG
OK
>> GO TO 10.
NG
>> Replace fuel pump.
10.
CHECK INTERMITTENT INCIDENT
Refer to
EC-158, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
OK or NG
OK
>> Replace IPDM E/R.
NG
>> Repair or replace harness or connectors.
Component Inspection
UBS00KIG
FUEL PUMP
1.
Disconnect “fuel level sensor unit and fuel pump” harness connector.
2.
Check resistance between “fuel level sensor unit and fuel pump”
terminals 1 and 3.
Removal and Installation
UBS00KIH
FUEL PUMP
Refer to
FL-5, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY"
.
Continuity should exist.
BBIA0545E
Resistance: Approximately 0.2 - 5.0
Ω
[at 25
°
C
(77
°
F)]
SEC918C
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