1998 NISSAN PICK-UP fuel pump

FUNCTION TEST
ITEMCONDITION JUDGEMENT CHECK ITEM (REMEDY)
PW/ST SIGNAL
CIRCUIT
lIgnition switch: ON
(Engine running)
lPower steering oil pressure switch
circuit is tested when steering
wheel is rotated fully and then set
to a straight line running position.Locked position ONlHarness and connector
lPower steering oil pressure switch
lPower steering oil pump
Neutral position OFF
SWRL CONT S/V
CIRCUIT
lIgnition switch: ON
(Engine stopped)
lSwirl control valve control sole-
noid valve circuit is tested by
checking solenoid valve operating
sound.The solenoid valve makes an
operating sound every 3 sec-
onds.
lHarness and connector
lSolenoid valve
lSwirl control valve
lVacuum hose
VEHICLE SPEED
SEN CKT
lVehicle speed sensor circuit is
tested when vehicle is running at
a speed of 10 km/h (6 MPH) or
higher.Vehicle speed sensor input
signal is greater than 4 km/h
(2 MPH).lHarness and connector
lVehicle speed sensor
lSpeedometer
IGN TIMING ADJ
lAfter warming up, idle the engine.
lIgnition timing is checked by read-
ing ignition timing with a timing
light and checking whether it
agrees with specifications.The timing light indicates the
same value on the screen.
lAdjust ignition timing (by moving
camshaft position sensor or
distributor)
lCamshaft position sensor drive
mechanism
MIXTURE RATIO
TEST
lAir-fuel ratio feedback circuit
(injection system, ignition system,
vacuum system, etc.) is tested by
examining the heated oxygen
sensor output at 2,000 rpm under
non-loaded state.Heated oxygen sensor
COUNT: More than 5 times
during 10 seconds
lINJECTION SYS (Injector, fuel
pressure regulator, harness or
connector)
lIGNITION SYS (Spark plug,
ignition coil, power transistor
harness or connector)
lVACUUM SYS (Intake air leaks)
lHeated oxygen sensor circuit
lHeated oxygen sensor operation
lFuel pressure high or low
lMass air flow sensor
POWER BALANCE
lAfter warming up, idle the engine.
lInjector operation of each cylinder
is stopped one after another, and
resultant change in engine rota-
tion is examined to evaluate com-
bustion of each cylinder. (This is
only displayed for models where a
sequential multiport fuel injection
system is used.)Difference in engine speed is
greater than 25 rpm before
and after cutting off the injec-
tor of each cylinder.lInjector circuit (Injector, harness
or connector)
lIgnition circuit (Spark plug, igni-
tion coil, power transistor harness
or connector)
lCompression
lValve timing
IACV-AAC/V
SYSTEM
lAfter warming up, idle the engine.
lIACV-AAC valve system is tested
by detecting change in engine
speed when IACV-AAC valve
opening is changed to 0%, 20%
and 80%.Difference in engine speed is
greater than 150 rpm between
when valve opening is at 80%
and at 20%.
lHarness and connector
lIACV-AAC valve
lAir passage restriction between
air inlet and IACV-AAC valve
lIAS (Idle adjusting screw) adjust-
ment
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONKA
CONSULT (Cont'd)
EC-52

Fail-Safe Chart
The ECM enters fail-safe mode, if any of the following malfunctions are detected due to the open or short
circuit.
When the ECM enters the ECM fail-safe mode listed in the last column below, the MIL illuminates.
DTC No.Detected
itemsEngine operating condition in fail-safe mode
12Mass air
flow sensor
circuitEngine speed will not rise more than 2,400 rpm due to the fuel cut.
13 Engine cool-
ant tempera-
ture sensor
circuitEngine coolant temperature will be determined by ECM based on the time after turning ignition switch
``ON'' or ``START''.
CONSULT displays the engine coolant temperature decided by ECM.
41 Intake air
temperature
sensor cir-
cuitThe ECM controls on the assumption that the intake air temperature is 20ÉC (68ÉF).
43 Throttle
position sen-
sor circuitThrottle position will be determined based on the amount of mass air flow and the engine speed.
Therefore, acceleration will be poor.
Unable to
access Diag-
nostic Test
Mode IIECMECM fail-safe activating condition
The computing function of the ECM was judged to be malfunctioning.
When the fail-safe system activates, i.e. if the ECM detects a malfunction condition in the CPU of
ECM, the MALFUNCTION INDICATOR LAMP on the instrument panel lights to warn the driver.
However, it is not possible to access ECCS and DTC cannot be confirmed.
Engine control with ECM fail-safe
When the fail-safe system is operating, fuel injection, ignition timing, fuel pump operation and IACV-
AAC valve operation are controlled under certain limitations.
Replace ECM, if ECM fail-safe condition is confirmed.
ConditionEngine coolant temperature decided
(CONSULT display)
Just as ignition switch is turned ON or START 20ÉC (68ÉF)
More than 6 minutes after ignition START 80ÉC (176ÉF)
Except as shown above20 - 80ÉC (68 - 176ÉF)
(Depends on the time)
Driving condition
When engine is idling Normal
When accelerating Poor acceleration
ECM fail-safe operation
Engine speed Engine speed will not rise more than 3,000 rpm.
Fuel injection Simultaneous multiport fuel injection system
Ignition timing Ignition timing is fixed at the preset value.
Fuel pumpFuel pump relay is ``ON'' when engine is running and ``OFF'' when
engine stalls.
IACV-AAC valve Full open
TROUBLE DIAGNOSIS Ð General DescriptionKA
EC-61

Symptom Matrix Chart
SYMPTOM
Reference page
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
BATTERY DEAD (UNDER CHARGE)
OVERCOOLS
OVERCHARGING
Warranty Symptom Code AA AB AC AD AE AF AG AH AJ AK AL AM HA 1P 1X
Basic engine control system
Fuel Fuel pump circuitllljlljjjEC-151
Fuel pressure regulator system
llljljlljlEC-22
Injector circuit
llljlll lEC-144
Evaporative emission systemjjjj
ljjjj jEC-19
Air Positive crankcase ventilation systemjjjj
ljjjj jjEC-21
Incorrect idle speed adjustmentjj jjjj jEC-25
Swirl control valve circuitjj
lEC-161
IACV-AAC valve circuit
llljllllljjEC-131
IACV-FICD solenoid valve circuitjjjjjjjjj jEC-168
Ignition Incorrect ignition timing adjustmentjj
lll ll lEC-25
Ignition circuit
lllll ll lEC-99
EVAP EVAP canister purge control solenoid
valve circuit
ljjjj j jEC-140
Main power supply and ground circuit
llljj jj jj jEC-75
Air conditioner circuitjjjjjjjjj j jHA section
ECCS system
ECCS Camshaft position sensor circuitllllljj jEC-82
Mass air flow sensor circuit
lllll ljjEC-89
Heated oxygen sensor circuit
lljlljlEC-123, 127
Engine coolant temperature sensor circuit
llljllljjlEC-95
Throttle position sensor circuit
ll lllll lEC-113
Incorrect throttle position sensor adjust-
ment
ljjljjljEC-58
Vehicle speed sensor circuitjj j jEC-118
ECMjjjjjjjjjjjEC-61
Start signal circuitjEC-149
Neutral position switch circuitjjjj jEC-136
Power steering oil pressure switch circuitjjjEC-157
l; High Possibility Item
j; Low Possibility Item(continued on next page)
TROUBLE DIAGNOSIS Ð General DescriptionKA
EC-62

SYSTEM
Ð Engine mechanical & otherSYMPTOM
Reference page
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
BATTERY DEAD (UNDER CHARGE)
OVERCOOLS
OVERCHARGING
Warranty Symptom Code AA AB AC AD AE AF AG AH AJ AK AL AM HA 1P 1X
Fuel Fuel tank
ll
Ð Fuel piping
lljjljj j
Vapor lockj
Valve depositjjjjj jj j
Poor fuel (Heavy weight gasoline, Low
octane)jjjjj jj j
Air Air ductjjjjj j
Air cleanerj
llljj
Air leakage from air duct
(Mass air flow sensor Ð throttle body)jjjjjjjjj j
Throttle body, Throttle wirej
lljlljj jFE section
Air leakage from intake manifold/
Collector/Gasketj
ljjjjljjlÐ
Cranking Batteryjjjjjj jjj
EL section Alternator circuitjjjjjj jjj
Starter circuit
l
FlywheellÐ
Engine Cylinder head
ljljjljj
Ð Cylinder head gasketjjjjj
ljljj
Cylinder blockjjjj
ljj jj
Pistonjjjjj j
ljl
Piston ringjjjjlljjl
Connecting rodljjjj jj j
Bearing
lljljjlj
Crankshaftjjjjj jj j
Valve
mechanismTiming chain
ljljljj j
Camshaft
ljjjj jj j
Intake valvej
lljjljjj
Exhaust valve
ljljlljjl
Exhaust Exhaust manifold/Tube/Muffler/Gasketjllll ljl
Three way catalystjljjljj j
Lubrication Oil pan/Oil strainer/Oil pump/Oil filter/Oil
gallery
ljjlljj jl
Oil level (Low)/Filthy oiljjjjj jj jj
Cooling Radiator/Hose/Radiator filler capjjjjj jj
lj
Thermostatjjjjjj
ljjljj
Water pump
ljjjj jjlj
Water galleryjjjjj jj jj
Cooling fanjjjj
ljljjljj
Coolant level (low)/Contaminated coolantjjjjj jj jj
l; High Possibility Item
j; Low Possibility Item
TROUBLE DIAGNOSIS Ð General DescriptionKA
Symptom Matrix Chart (Cont'd)
EC-63

CONSULT Reference Value in Data Monitor
Mode
Remarks:
lSpecification data are reference values.
lSpecification data are output/input values which are detected or supplied by the ECM at the connector.
* Specification data may not be directly related to their components signals/values/operations.
i.e. Adjust ignition timing with a timing light before monitoring IGN TIMING, because the monitor may show the specification data
in spite of the ignition timing not being adjusted to the specification data. This IGN TIMING monitors the data calculated by the
ECM according to the signals input from the camshaft position sensor and other ignition timing related sensors.
lIf the real-time diagnosis results are NG and the on board diagnostic system results are OK when diagnosing the mass air flow
sensor, first check to see if the fuel pump control circuit is normal.
MONITOR ITEM CONDITION SPECIFICATION
CMPScRPM (POS)
lTachometer: ConnectlRun engine and compare tachometer indication with the CONSULT value.Almost the same speed as the CON-
SULT value.
MAS AIR/FL SE
lEngine: After warming uplAir conditioner switch: ``OFF''lShift lever: Neutral positionlNo-loadIdle 1.3 - 1.7V
2,500 rpm 1.7 - 2.1V
COOLAN TEMP/S
lEngine: After warming up More than 70ÉC (158ÉF)
O2 SEN
lEngine: After warming up Maintaining engine speed at 2,000 rpm0 - 0.3V«0.6 - 1.0V
M/R F/C MNTRLEAN«RICH
Changes more than 5 times
during 10 seconds.
VHCL SPEED SE
lTurn drive wheels and compare speedometer indication with the CONSULT
valueAlmost the same speed as
the CONSULT value
BATTERY VOLT
lIgnition switch: ON (Engine stopped) 11 - 14V
THRTL POS SEN
lIgnition switch: ON
(Engine stopped)Throttle valve: fully closed 0.35 - 0.65V
Throttle valve: fully opened Approx. 4.0V
START SIGNAL
lIgnition switch: ON®START®ON OFF®ON®OFF
CLSD THL/POSI
lIgnition switch: ON
(Engine stopped)Throttle valve: Idle position ON
Throttle valve: Slightly open OFF
AIR COND SIG
lEngine: After warming up, idle the
engineAir conditioner switch: ``OFF'' OFF
Air conditioner switch: ``ON''
(Compressor operates.)ON
P/N POSI SW
lIgnition switch: ONShift lever: Neutral position ON
Except above OFF
PW/ST SIGNAL
lEngine: After warming up, idle the
engineSteering wheel in neutral position
(forward direction)OFF
The steering wheel is turned ON
TROUBLE DIAGNOSIS Ð General DescriptionKA
EC-64

MONITOR ITEM CONDITION SPECIFICATION
INJ PULSE
lEngine: After warming uplAir conditioner switch: ``OFF''lShift lever: Neutral positionlNo-loadIdle 2.4 - 3.2 msec.
2,000 rpm 1.9 - 3.2 msec.
IGN TIMING dittoIdle 10É BTDC
2,000 rpm More than 25É BTDC
IACV-AAC/V dittoIdle 20 - 40%
2,000 rpm Ð
A/F ALPHA
lEngine: After warming up Maintaining engine speed at 2,000 rpm 65 - 140%
AIR COND RLY
lAir conditioner switch: OFF®ON OFF®ON
FUEL PUMP RLY
lIgnition switch is turned to ON (Operates for 5 seconds)lEngine running and crankinglWhen engine is stopped (Stops in 1 second)ON
Except as shown above OFF
SWRL CONT S/V
lEngine is running at a speed of less than 3,600 rpm. ON
lExcept above OFF
EGRC SOL/V
lEngine: After warming uplAir conditioner switch: OFFlShift lever: Neutral positionlNo-loadIdle OFF
Above 3,800 rpm ON
TROUBLE DIAGNOSIS Ð General DescriptionKA
CONSULT Reference Value in Data Monitor
Mode (Cont'd)
EC-65

TERMINAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC voltage)
101
103
110
112W/B
W/R
W/L
W/GInjector No. 1
Injector No. 3
Injector No. 2
Injector No. 4Engine is running.
(Warm-up condition)
Idle speedBATTERY VOLTAGE
(11 - 14V)
SEF069U
Engine is running.
Engine speed is 2,000 rpm.BATTERY VOLTAGE
(11 - 14V)
SEF070U
104 W/R Fuel pump relayIgnition switch ``ON''
For 5 seconds after turning ignition switch
``ON''
Engine is running.Approximately 1V
Ignition switch ``ON''
5 seconds after turning ignition switch ``ON''BATTERY VOLTAGE
(11 - 14V)
105 W/LEVAP canister
purge control
solenoid valveEngine is running.
(Warm-up condition)
Idle speedBATTERY VOLTAGE
(11 - 14V)
Engine is running.
(Warm-up condition)
Engine is above 3,800 rpm.Approximately 1V
107
108B/P ECCS groundEngine is running.
Idle speedEngine ground
109 B/W Current returnEngine is running.
Idle speedBATTERY VOLTAGE
(11 - 14V)
113 W/G IACV-AAC valveEngine is running.
Idle speed10 - 13V
Engine is running.
Steering wheel is being turned.Air conditioner is operating.Rear window defogger switch is ``ON''.Lighting switch is ``ON''.5 - 10V
114 RHeated oxygen
sensor heaterEngine is running.
Engine speed is below 3,200 rpm.Approximately 0V
Engine is running.
Engine speed is above 3,200 rpm.BATTERY VOLTAGE
(11 - 14V)
TROUBLE DIAGNOSIS Ð General DescriptionKA
ECM Terminals and Reference Value
(Cont'd)
EC-73

Fuel Pump
SYSTEM DESCRIPTION
Camshaft position sensorcEngine speed
ECM
(ECCS
control
mod-
ule)
cFuel
pump
relay
Ignition switchcStart signal
The ECM activates the fuel pump for several sec-
onds 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 operate. If the 180É signal is not received
when the ignition switch is on, the engine stalls.
The ECM stops pump operation and prevents bat-
tery discharging, thereby improving safety. The
ECM does not directly drive the fuel pump. It con-
trols 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.
When engine is stopped Stops in 1 second.
Except as shown above. Stops.
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 REFERENCE VALUE IN DATA MONITOR MODE
Remarks: Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
FUEL PUMP RLY
lIgnition switch is turned to ON (Operates for 5 seconds).lEngine running and crankinglWhen engine is stopped (Stops in 1 second)ON
Except as shown above OFF
SEF476P
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
EC-151