Nissan Pathfinder (2009 year). Instruction — part 298
EC-398
< COMPONENT DIAGNOSIS >
[VQ40DE]
FUEL PUMP
FUEL PUMP
Description
INFOID:0000000004297641
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.
Diagnosis Procedure
INFOID:0000000004297642
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.
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
BBIA0563E
2009 Pathfinder
FUEL PUMP
EC-399
< COMPONENT DIAGNOSIS >
[VQ40DE]
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4.
Check voltage between ECM terminal 113 and ground with
CONSULT-III or tester.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 3.
3.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II
Check voltage between IPDM E/R terminal 46 and ground with
CONSULT-III or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 12.
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 “fuel level sensor unit and fuel pump” harness con-
nector.
4.
Turn ignition switch ON.
5.
Check voltage between “fuel level sensor unit and fuel pump”
terminal 1 and ground with CONSULT-III or tester.
6.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 9.
NG
>> GO TO 6.
6.
CHECK 15A FUSE
1.
Turn ignition switch OFF.
Voltage: Battery voltage
PBIB1187E
Voltage: Battery voltage
PBIB2656E
BBIA0545E
Voltage:
Battery voltage should exist for 1 sec-
ond after ignition switch is turned ON.
PBIB0795E
2009 Pathfinder
EC-400
< COMPONENT DIAGNOSIS >
[VQ40DE]
FUEL PUMP
2.
Disconnect 15A fuse.
3.
Check 15 A fuse (No.48).
OK or NG
OK
>> GO TO 7.
NG
>> Replace fuse.
7.
CHECK FUEL PUMP POWER SUPPLY CURCUIT-IV
1.
Disconnect IPDM E/R harness connector E119.
2.
Check harness continuity between “fuel level sensor unit and fuel pump” terminal 1 and IPDM E/R termi-
nal 13.
Refer to Wiring Diagram.
3.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 12.
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
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.
CHECK FUEL PUMP GROUND CIRCUIT FOR OPEN AND SHORT
1.
Check harness continuity between “fuel level sensor unit and fuel pump” terminal 3 and ground.
Refer to Wiring Diagram.
2.
Also check harness for short to ground.
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors C1, E41
• Harness for open or short between “fuel level sensor unit and fuel pump” and ground
>> Repair open circuit or short to power in harness or connectors.
11.
CHECK FUEL PUMP
EC-401, "Component Inspection"
OK or NG
OK
>> GO TO 12.
NG
>> Replace fuel pump.
12.
CHECK INTERMITTENT INCIDENT
GI-49, "Intermittent Incident"
OK or NG
OK
>> Replace IPDM E/R.
NG
>> Repair or replace harness or connectors.
Continuity should exist.
Continuity should exist.
2009 Pathfinder
FUEL PUMP
EC-401
< COMPONENT DIAGNOSIS >
[VQ40DE]
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Component Inspection
INFOID:0000000004297643
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.
Resistance: Approximately 0.2 - 5.0
Ω
[at 25
°
C (77
°
F)]
SEC918C
2009 Pathfinder
EC-402
< COMPONENT DIAGNOSIS >
[VQ40DE]
IGNITION SIGNAL
IGNITION SIGNAL
Component Description
INFOID:0000000004297644
IGNITION COIL & POWER TRANSISTOR
The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns
ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil
secondary circuit.
Diagnosis Procedure
INFOID:0000000004297645
1.
CHECK ENGINE START
Turn ignition switch OFF, and restart engine.
Is engine running?
Yes or No
Yes (With CONSULT-III)>>GO TO 2.
Yes (Without CONSULT-III)>>GO TO 3.
No
>> GO TO 4.
2.
CHECK OVERALL FUNCTION
With CONSULT-III
1.
Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.
2.
Make sure that each circuit produces a momentary engine speed drop.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 10.
3.
CHECK OVERALL FUNCTION
Without CONSULT-III
1.
Let engine idle.
2.
Read the voltage signal between ECM terminals 60, 61, 62, 79,
80, 81 and ground with an oscilloscope.
3.
Verify that the oscilloscope screen shows the signal wave as
shown below.
NOTE:
The pulse cycle changes depending on rpm at idle.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 10.
4.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I
BBIA0561E
PBIB1186E
SEC986C
2009 Pathfinder
IGNITION SIGNAL
EC-403
< COMPONENT DIAGNOSIS >
[VQ40DE]
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1.
Turn ignition switch OFF, wait at least 10 seconds and then turn it ON.
2.
Check voltage between ECM terminals 119, 120 and ground
with CONSULT-III or tester.
OK or NG
OK
>> GO TO 5.
NG
>> Go to
.
5.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II
1.
Turn ignition switch OFF.
2.
Disconnect condenser-1 harness connector.
3.
Turn ignition switch ON.
4.
Check voltage between condenser-1 terminal 1 and ground with
CONSULT-III or tester.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 6.
6.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III
1.
Turn ignition switch OFF.
2.
Disconnect IPDM E/R harness connector E119.
3.
Check harness continuity between IPDM E/R terminal 3 and condenser-1 terminal 1.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 17.
NG
>> GO TO 7.
7.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E2, F32
• Harness for open or short between condenser-1 and IPDM E/R
>> Repair open circuit or short to ground or short to power in harness or connectors.
Voltage: Battery voltage
MBIB0034E
BBIA0562E
Voltage: Battery voltage
PBIB0624E
Continuity should exist.
2009 Pathfinder
EC-404
< COMPONENT DIAGNOSIS >
[VQ40DE]
IGNITION SIGNAL
8.
CHECK CONDENSER-1 GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Check harness continuity between condenser-1 terminal 2 and ground.
Refer to Wiring Diagram.
3.
Also check harness for short to power.
OK or NG
OK
>> GO TO 9.
NG
>> Repair open circuit or short to power in harness or connectors.
9.
CHECK CONDENSER-1
EC-405, "Component Inspection"
OK or NG
OK
>> GO TO 10.
NG
>> Replace condenser-1.
10.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-V
1.
Turn ignition switch OFF.
2.
Reconnect all harness connectors disconnected.
3.
Disconnect ignition coil harness connector.
4.
Turn ignition switch ON.
5.
Check voltage between ignition coil terminal 3 and ground with
CONSULT-III or tester.
OK or NG
OK
>> GO TO 12.
NG
>> GO TO 11.
11.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F26, F225
• Harness for open or short between ignition coil and harness connector F32
>> Repair or replace harness or connectors.
12.
CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Check harness continuity between ignition coil terminal 2 and ground.
Refer to Wiring Diagram.
Continuity should exist.
Voltage: Battery voltage
BBIA0561E
PBIB0138E
Continuity should exist.
2009 Pathfinder
IGNITION SIGNAL
EC-405
< COMPONENT DIAGNOSIS >
[VQ40DE]
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3.
Also check harness for short to power.
OK or NG
OK
>> GO TO 14.
NG
>> GO TO 13.
13.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F225, F26
• Harness for open or short between ignition coil and ground
>> Repair open circuit or short to power in harness or connectors.
14.
CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Check harness continuity between ECM terminals 60, 61, 62, 79, 80, 81 and ignition coil terminal 1.
Refer to Wiring Diagram.
3.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 16.
NG
>> GO TO 15.
15.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F26, F225
• Harness for open or short between ignition coil and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
16.
CHECK IGNITION COIL WITH POWER TRANSISTOR
EC-405, "Component Inspection"
OK or NG
OK
>> GO TO 17.
NG
>> Replace malfunctioning ignition coil with power transistor.
17.
CHECK INTERMITTENT INCIDENT
GI-49, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000004297646
IGNITION COIL WITH POWER TRANSISTOR
CAUTION:
Do the following procedure in the place where ventilation is good without the combustible.
1.
Turn ignition switch OFF.
2.
Disconnect ignition coil harness connector.
Continuity should exist.
2009 Pathfinder
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