Nissan Frontier D22. Manual — part 361
START SIGNAL
EC-547
[KA24DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
4.
DETECT MALFUNCTIONING PART
Check the 7.5A fuse.
OK or NG
OK
>> GO TO 5.
NG
>> Replace 7.5A fuse.
5.
CHECK INPUT SIGNAL CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector and 7.5A fuse.
3.
Check harness continuity between ECM terminal 20 and fuse
block.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 6.
6.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors M81, F36
●
Fuse block (J/B) connector M26
●
Harness for open or short between ECM and fuse block
OK or NG
OK
>> GO TO 7.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
7.
CHECK INTERMITTENT INCIDENT
Perform
EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END.
Continuity should exist.
SEF224V
EC-548
[KA24DE]
FUEL PUMP CIRCUIT
FUEL PUMP CIRCUIT
PFP:17042
Description
UBS00DDC
SYSTEM DESCRIPTION
The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine
startability. If the ECM receives a 180
° signal from the camshaft position sensor, it knows that the engine is
rotating, and causes the pump to perform. If the 180
° 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
The fuel pump with a fuel damper is an in-tank type (the pump and
damper are located in the fuel tank).
CONSULT-II Reference Value in Data Monitor Mode
UBS00DDD
Sensor
Input Signal to ECM
ECM function
Actuator
Camshaft position sensor
Engine speed
Fuel pump control
Fuel pump relay
Ignition switch
Start signal
Condition
Fuel pump operation
Ignition switch is turned to ON.
Operates for 5 seconds.
Engine running and cranking
Operates.
Except as shown above
Stops.
SFE425A
MONITOR ITEM
CONDITION
SPECIFICATION
FUEL PUMP RLY
●
Ignition switch is turned to ON (Operates for 5 seconds)
●
Engine running and cranking
ON
●
Except as shown above
OFF
FUEL PUMP CIRCUIT
EC-549
[KA24DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Wiring Diagram
UBS00DDE
BBWA1071E
EC-550
[KA24DE]
FUEL PUMP CIRCUIT
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
UBS00DDF
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 5 seconds after ignition switch is turned ON.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
2.
CHECK POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect fuel pump relay.
3.
Turn ignition switch ON.
4.
Check voltage between terminals 2, 5 and ground with CON-
SULT-II or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
11
W/R
Fuel pump relay
[Ignition switch: ON]
●
For a few seconds after turning ignition switch ON
[Engine is running]
0 - 1V
[Ignition switch: ON]
●
More than a few seconds after turning ignition
switch ON
BATTERY VOLTAGE
(11 - 14V)
SEF348V
Voltage
: Battery voltage
LEC103A
SEF225V
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