2001 NISSAN PICK-UP Repair Manual

Diagnostic Procedure=NEEC0443
1 INSPECTION START
Do you have CONSULT-II?
YesorNo
Ye s©GO TO 2.
No©GO TO 3.
2 CHECK OVERALL FUNCTION
With CONSULT-II
1. Turn ignition switch ON.
2. Check ªSTART SIGNALº in ªDATA MONITORº mode with CONSULT-II under the following conditions.
SEF227Y
OK or NG
OK©INSPECTION END
NG©GO TO 4.
3 CHECK OVERALL FUNCTION
Without CONSULT-II
1. Turn ignition switch to START.
2. Check voltage between ECM terminal 20 and ground under the following conditions.
SEF109P
MTBL0143
OK or NG
OK©INSPECTION END
NG©GO TO 4.
START SIGNALKA24DE (EURO OBD)
Diagnostic Procedure
EC-3376

4 DETECT MALFUNCTIONING PART
Check the following.
+40A fuse
+Harness connectors E101, M5
+Harness for open or short between ignition switch and 40A fuse
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 INPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector and ignition switch.
3. Check harness continuity between ECM terminal 20 and ignition switch terminal 6. 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 7.
NG©GO TO 6.
6 DETECT MALFUNCTIONING PART
Check the following.
+Fuse block connectors M10, M12
+Harness for open or short between ECM and ignition switch
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 ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-3123.
©INSPECTION END
START SIGNALKA24DE (EURO OBD)
Diagnostic Procedure
EC-3377

System DescriptionNEEC0444
Sensor Input Signal to ECMECM func-
tionActuator
Camshaft position sensor Engine speed
Fuel pump
controlFuel 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 180É signal from the camshaft position sensor, it knows that the engine is
rotating, and causes the pump to perform. If the 180É 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 5 seconds.
Engine running and cranking Operates.
Except as shown aboveStops.
SFE425A
Component DescriptionNEEC0501The 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
NEEC0445
MONITOR ITEM CONDITION SPECIFICATION
FUEL PUMP RLY+Ignition switch is turned to ON (Operates for 5 seconds)
+Engine running and crankingON
+Except as shown above OFF
FUEL PUMPKA24DE (EURO OBD)
System Description
EC-3378

ECM Terminals and Reference Value=NEEC0446Specification 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
COLORITEM CONDITION DATA (DC Voltage)
11*1 Y Fuel pump relay[Ignition switch ªONº]
+For 5 seconds after turning ignition switch ªONº
[Engine is running]0-1V
[Ignition switch ªONº]
+More than 5 seconds after turning ignition switch
ªONºBATTERY VOLTAGE
(11 - 14V)
14*2 Y Fuel pump relay[Ignition switch ON]
+For 5 seconds after turning ignition switch0-1V
[Ignition switch ON]
+More than 5 seconds after turning ignition switch
ONBATTERY VOLTAGE
(11 - 14V)
*1: Model without NATS (Nissan Anti-Theft System)
*2: Model with NATS (Nissan Anti-Theft System)
FUEL PUMPKA24DE (EURO OBD)
ECM Terminals and Reference Value
EC-3379

Wiring DiagramNEEC0447
GEC256A
FUEL PUMPKA24DE (EURO OBD)
Wiring Diagram
EC-3380

Diagnostic ProcedureNEEC1074
1 CHECK OVERALL FUNCTION
1. Turn ignition switch ON.
2. Pinch fuel feed hose with two fingers.
SEF348V
Fuel pressure pulsation should be felt on the fuel feed hose for 5 seconds after ignition switch is turned ªONº.
OK or NG
OK©INSPECTION END
NG©GO TO 2.
2 CHECK POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect fuel pump relay.
LEC103A
3. Turn ignition switch ON.
4. Check voltage between terminals 2, 5 and ground with CONSULT-II or tester.
SEC279D
Voltage: Battery voltage
OK or NG
OK©GO TO 4.
NG©GO TO 3.
FUEL PUMPKA24DE (EURO OBD)
Diagnostic Procedure
EC-3381

3 DETECT MALFUNCTIONING PART
Check the following.
+15A fuse
+Harness for open or short between fuse and fuel pump relay
©Repair harness or connectors.
4 CHECK FUEL PUMP CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect fuel level sensor unit and fuel pump harness connector.
SEF334VA
3. Check harness continuity between fuel pump terminal 4 and body ground, fuel pump terminal 2 and fuel pump relay
terminal 3. 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.
+Harness connectors M121, C9
+Harness for open or short between fuel pump and body ground
+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 11 or (14)* and fuel pump relay terminal 1. Refer to wiring diagram.
*: Model with NATS (Nissan Anti-Theft System)
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 8.
NG©Repair open circuit or short to ground or short to power in harness or connectors.
FUEL PUMPKA24DE (EURO OBD)
Diagnostic Procedure
EC-3382

7 CHECK FUEL PUMP RELAY
With CONSULT-II
1. Reconnect fuel pump relay, fuel level sensor unit and fuel pump harness connector and ECM harness connector.
2. Turn ignition switch ON.
3. Turn fuel pump relay ªONº and ªOFFº in ªACTIVE TESTº mode with CONSULT-II and check operating sound.
SEF724Z
Without CONSULT-II
Check continuity between terminals 3 and 5.
PBIB0098E
MTBL0306
OK or NG
OK©GO TO 8.
NG©Replace fuel pump relay.
FUEL PUMPKA24DE (EURO OBD)
Diagnostic Procedure
EC-3383