Nissan Frontier. Instruction — part 694
FUEL INJECTOR
EC-1347
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR MEXICO]
C
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EC
N
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4. Check voltage between harness connector F44 terminal 3 and
ground with CONSULT or tester.
5. Turn ignition switch OFF.
6. Disconnect ECM harness connector.
7. Check harness continuity between harness connector F44 and
ECM as follows.
Refer to Wiring Diagram.
8. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E2, F32
• IPDM E/R harness connector E119
• 15 A fuse (No.55)
• Harness for open or short between harness connector F44 and fuse
• Harness for open or short between harness connector F201 and fuel injector
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK FUNCTION OF FUEL INJECTOR-II
Provide battery voltage between harness connector F201 as follows
and then interrupt it. Listen to each fuel injector operating sound.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 7.
6.
CHECK FUNCTION OF FUEL INJECTOR-III
1. Reconnect all harness connector disconnected.
2. Start engine.
Voltage: Battery voltage
Cylinder
Harness connector F44
terminal
ECM terminal
1
2
23
3
1
22
5
4
21
Continuity should exist.
PBIB2633E
Cylinder
Harness connector F201 terminal
(+)
(–)
1
3
2
3
3
1
5
3
4
Operating sound should exist.
PBIB2634E
EC-1348
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR MEXICO]
FUEL INJECTOR
3. Listen to fuel injectors No. 2, No. 4, No.6 operating sound.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 7.
7.
CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect fuel injector harness connector.
3. Turn ignition switch ON.
4. Check voltage between fuel injector terminal 1 and ground with
CONSULT 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, F201
• IPDM E/R harness connector E119
• 15 A fuse (No.55)
• Harness for open or short between fuel injector and fuse
>> Repair harness or connectors.
9.
CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between fuel 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
Clicking noise should exist.
PBIB1986E
BBIA0546E
Voltage: Battery voltage
PBIB0582E
Continuity should exist.
FUEL INJECTOR
EC-1349
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR MEXICO]
C
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EC
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OK
>> GO TO 11.
NG
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F201, F44
• Harness for open or short between fuel injector and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
11.
CHECK FUEL INJECTOR
EC-1349, "Component Inspection"
.
OK or NG
OK
>> GO TO 12.
NG
>> Replace fuel injector. Refer to
12.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000009482033
FUEL INJECTOR
1. Disconnect injector harness connector.
2. Check resistance between terminals as shown in the figure.
Resistance: 11.1 - 14.5
Ω [at 10 - 60°C (50 - 140°F)]
PBIB1727E
EC-1350
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR MEXICO]
FUEL PUMP
FUEL PUMP
Description
INFOID:0000000009482034
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:0000000009482035
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
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