Nissan Primera P11. Instruction — part 279
4
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M50, F104 (CVT: M81, F115)
I
10A fuse
I
Harness for open or short between ECM and ignition switch
OK or NG
OK
©
GO TO 5.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
5
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-SR-114.
©
INSPECTION END
START SIGNAL
SR20DE
Diagnostic Procedure (Cont’d)
EC-315
System Description
NCEC0444
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Camshaft position sensor (REF)
Engine speed
ECM
Fuel pump relay
Ignition switch
Start signal
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.
Condition
Fuel pump operation
Ignition switch is turned to ON.
Operates for 2 seconds
Engine running and cranking
Operates
When engine is stopped
Stops in 1.5 seconds
Except as shown above
Stops
Component Description
NCEC0501
A turbine type design fuel pump is used in the fuel tank.
CONSULT-II Reference Value in Data Monitor
Mode
NCEC0445
MONITOR ITEM
CONDITION
SPECIFICATION
FUEL PUMP RLY
I
Ignition switch is turned to ON (Operates for 2 seconds)
I
Engine running and cranking
I
When engine is stopped (stops in 1.5 seconds)
ON
I
Except as shown above
OFF
ECM Terminals and Reference Value
NCEC0446
Specification data are reference values and are measured between each terminal and 48 (ECM ground).
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
21
B/P
Fuel pump relay
[Ignition switch “ON”]
I
For 2 seconds after turning ignition switch “ON”
[Engine is running]
0 - 1V
[Ignition switch “ON”]
I
More than 1 second after turning ignition switch
“ON”
BATTERY VOLTAGE
(11 - 14V)
AEC801
FUEL PUMP
SR20DE
System Description
EC-316
Wiring Diagram
NCEC0447
YEC253
IGNITION SWITCH
ON or START
Refer to EL-POWER.
Detectable line for DTC
Non-detectable line for DTC
Hyper CVT models
M/T models
FUSE
BLOCK
(J/B)
ECM
.
REFER TO THE FOLLOWING
M1
FUSE BLOCK -
Junction Box (J/B)
B8
FUSE BLOCK -
Junction Box (J/B)
FUEL
PUMP
RELAY
FUEL PUMP
FUEL PUMP
SR20DE
Wiring Diagram
EC-317
Diagnostic Procedure
NCEC0448
1
CHECK OVERALL FUNCTION
1. Turn ignition switch “ON”.
2. Pinch fuel feed hose with fingers.
SEF241X
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 POWER SUPPLY
1. Turn ignition switch “OFF”.
2. Disconnect fuel pump relay located on the fuse block.
SEF071X
3. Turn ignition switch “ON”.
4. Check voltage between terminals 1, 3 and ground with CONSULT-II or tester.
SEF144X
Voltage: Battery voltage
OK or NG
OK
©
GO TO 4.
NG
©
GO TO 3.
Fuel filter
Pinch
FUEL PUMP
SR20DE
Diagnostic Procedure
EC-318
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