Nissan Frontier. Manual — part 590
FUEL INJECTOR
EC-931
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
GI-42, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000009481639
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)]
EC-932
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
FUEL PUMP
FUEL PUMP
Description
INFOID:0000000009481640
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:0000000009481641
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
FUEL PUMP
EC-933
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
4. Check voltage between ECM terminal 43 and ground with CONSULT 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 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
Harness connectors E5, F14
>> 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 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.
2. Disconnect 15A fuse.
3. Check 15 A fuse (No.48).
OK or NG
OK
>> GO TO 7.
NG
>> Replace 15A fuse.
7.
CHECK FUEL PUMP POWER SUPPLY CURCUIT-IV
1. Disconnect IPDM E/R harness connector E119.
Voltage: Battery voltage
Voltage: Battery voltage
BBIA0545E
Voltage:
Battery voltage should exist for 1 sec-
ond after ignition switch is turned ON.
EC-934
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
FUEL PUMP
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-934, "Component Inspection"
OK or NG
OK
>> GO TO 12.
NG
>> Replace fuel pump. Refer to
FL-10, "Removal and Installation"
12.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
OK or NG
OK
>> Replace IPDM E/R. Refer to
PCS-28, "Removal and Installation of IPDM E/R"
.
NG
>> Repair or replace harness or connectors.
Component Inspection
INFOID:0000000009481642
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.
Continuity should exist.
Continuity should exist.
Resistance: Approximately 0.2 - 5.0
Ω [at 25°C (77°F)]
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