Nissan Primera P11. Instruction — part 195
ECM Terminals and Reference Value
NCEC0446
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.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
21
B/P
Fuel pump relay
[Ignition switch “ON”]
I
For 1 second 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)
FUEL PUMP
QG16
I
18DE
ECM Terminals and Reference Value
EC-337
Wiring Diagram
NCEC0447
YEC280
FUEL PUMP
QG16
I
18DE
Wiring Diagram
EC-338
Diagnostic Procedure
NCEC0448
1
CHECK OVERALL FUNCTION
1. Turn ignition switch “ON”.
2. Pinch fuel feed hose with fingers.
SEF143X
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.
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 PUMP
QG16
I
18DE
Diagnostic Procedure
EC-339
3
DETECT MALFUNCTIONING PART
Check the following.
I
15A fuse
I
Harness for open or short between fuse and fuel pump relay
©
Repair harness or connectors.
4
CHECK POWER GROUND CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect fuel pump harness connector.
SEF299W
3. Check harness continuity between fuel pump harness connector terminal 2 and body ground, terminal 1 and fuel pump relay connector
terminal 9J.
Refer to wiring diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 6.
NG
©
GO TO 5.
5
DETECT MALFUNCTIONING PART
Check the following.
I
Harness for open or short between fuel pump and body ground
I
Harness for open or short between fuel pump and fuel pump relay
©
Repair open circuit or short to ground or short to power in harness or connectors.
6
CHECK OUTPUT SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 21 and fuel pump relay connector terminal 19C.
Refer to wiring diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 8.
NG
©
GO TO 7.
7
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M50, F104
I
Harness for open or short between ECM and fuel pump relay
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
FUEL PUMP
QG16
I
18DE
Diagnostic Procedure (Cont’d)
EC-340
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