NISSAN PICK-UP 1998 Repair Manual

Start Signal
HEC350
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
EC-149

DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK OVERALL FUNCTION.
1. Turn ignition switch ``ON''.
2. Perform ``START SIGNAL CKT''
in ``FUNCTION TEST'' mode
with CONSULT.
----------------------------------------------------------------------------------------------------------------------------------OR----------------------------------------------------------------------------------------------------------------------------------
1. Turn ignition switch ``ON''.
2. Check ``START SIGNAL'' in
``DATA MONITOR'' mode with
CONSULT.
----------------------------------------------------------------------------------------------------------------------------------OR----------------------------------------------------------------------------------------------------------------------------------
1. Turn ignition switch to
``START''.
2. Check voltage between ECM
terminal
V34and ground.
Voltage:
Ignition switch ``START''
Battery voltage
Except above
Approximately 0V
NG
cOK
INSPECTION END
Check if 7.5A fuse is OK.
OK
cNG
Replace 7.5A fuse.
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
V34and fuse block.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
cNG
Check the following.
lHarness connectorsF54,M48(RHD mod-
els)
lHarness for open or
short between ECM and
fuse block
If NG, repair open circuit,
short to ground or short to
power in harness or con-
nectors.
Disconnect and reconnect harness con-
nectors in the circuit. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM harness
connector and retest.
INSPECTION END
IGN ``ON'' OFF
IGN ``START'' ON
SEF191L
SEF153U
SEF107U
SEF108U
.
.
.
.
.
.
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Start Signal (Cont'd)
EC-150

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

ECM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values, and are measured between each terminal andV39(ECCS ground) with a voltme-
ter.
TER-
MINAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC voltage)
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)
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Fuel Pump (Cont'd)
EC-152

LHD MODELS
HEC563
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Fuel Pump (Cont'd)
EC-153

RHD MODELS
HEC354
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Fuel Pump (Cont'd)
EC-154

DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK OVERALL FUNCTION.
1. Turn ignition switch ``ON''.
2. Pinch fuel feed hose with fingers.
Fuel pressure pulsation should be
felt on the fuel feed hose for 5 sec-
onds after ignition switch is turned
``ON''.
NG
cOK
INSPECTION END
CHECK POWER SUPPLY.
1. Turn ignition switch ``OFF''.
2. Disconnect fuel pump relay.
3. Turn ignition switch ``ON''.
4. Check voltage between terminals
V1,
V3and ground with CONSULT or
tester.
Voltage: Battery voltage
OK
cNG
Check the following.
l15A fuse
lHarness connectorsE101,M5
lHarness for open or
short between fuse and
fuel pump relay
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch ``OFF''.
2. Disconnect fuel pump harness connec-
tor.
3. Check harness continuity between ter-
minal
V6and body ground, relay ter-
minal
V5and terminalV5.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
cNG
Check the following.
lHarness connectorsC9,M121(LHD mod-
els for Europe)
lHarness connectorsE101,M5
lHarness for open or
short between fuel pump
and body ground
lHarness for open or
short between fuel pump
and fuel pump relay
If NG, repair open circuit,
short to ground or short to
power in harness or con-
nectors.
CHECK OUTPUT SIGNAL CIRCUIT.
1. Disconnect ECM harness connector.
2. Check harness continuity between
ECM terminal
104and terminalV2.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
cNG
Check the following.
lHarness connectorsE101,M5
lHarness connectorsM48,F54(RHD mod-
els)
lHarness for open or
short between ECM and
fuel pump relay
If NG, repair open circuit,
short to ground or short to
power in harness or con-
nectors.
VA
(Go to next page.)
SEF109U
SEF110U
SEF479P
SEF154U
.
.
.
.
.
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Fuel Pump (Cont'd)
EC-155

VA
CHECK COMPONENT
(Fuel pump relay).
1. Reconnect fuel pump relay, fuel
pump harness connector and
ECM harness connector.
2. Turn ignition switch ``ON''.
3. Turn fuel pump relay ``ON'' and
``OFF'' in ``ACTIVE TEST''
mode with CONSULT and
check operating sound.
----------------------------------------------------------------------------------------------------------------------------------OR----------------------------------------------------------------------------------------------------------------------------------
Refer to ``COMPONENT INSPEC-
TION'' below.
OK
cNG
Replace fuel pump relay.
CHECK COMPONENT
(Fuel pump).
Refer to ``COMPONENT INSPECTION''
below.
OK
cNG
Replace fuel pump.
Disconnect and reconnect harness con-
nectors in the circuit. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM harness
connector and retest.
INSPECTION END
COMPONENT INSPECTION
Fuel pump relay
Check continuity between terminalsV3andV5.
Conditions Continuity
12V direct current supply
between terminals
V1andV2Yes
No current supply No
If NG, replace relay.
Fuel pump
1. Disconnect fuel pump harness connector.
2. Check resistance between terminals
V5andV6.
Resistance: 0.2 - 5.0Wat 25ÉC (77ÉF)
If NG, replace fuel pump.
SEF111U
SEF168U
SEF511P
SEF155U
.
.
.
.
.
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Fuel Pump (Cont'd)
EC-156

Power Steering Oil Pressure Switch
HEC564
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
EC-157

COMPONENT DESCRIPTION
The power steering oil pressure switch is attached to the power
steering high-pressure tube and detects a power steering load.
When a power steering load is detected, it signals the ECM. The
ECM adjusts the IACV-AAC valve to increase the idle speed and
adjust for the increased load.
CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Remarks: Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
PW/ST SIGNAL
lEngine: After warming up, idle the
engineSteering wheel in neutral position
(forward direction)OFF
The steering wheel is turned ON
ECM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values, and are measured between each terminal andV39(ECCS ground) with a voltme-
ter.
TER-
MINAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC voltage)
43 GPower steering oil pres-
sure switchEngine is running.
Steering wheel is being turned.0V
Engine is running.
Steering wheel is not being turned.Approximately 5V
SEF112U
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Power Steering Oil Pressure Switch (Cont'd)
EC-158