1998 NISSAN PICK-UP Repair Manual

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

Major Sensor Reference Graph in Data
Monitor Mode
The following are the major sensor reference graphs in ``DATA MONITOR'' mode.
(Select ``HI SPEED'' in ``DATA MONITOR'' with CONSULT.)
THRTL POS SEN, CLSD THL/POSI
Below is the data for ``THRTL POS SEN'' and ``CLSD THL/POSI'' when depressing the accelerator pedal
with the ignition switch ``ON''.
The signal of ``THRTL POS SEN'' should rise gradually without any intermittent drop or rise after ``CLSD
THL/POSI'' is changed from ``ON'' to ``OFF''.
CMPScRPM (POS), MAS AIR/FL SE, THRTL POS SEN, O2 SEN, INJ PULSE
Below is the data for ``CMPSRPM (POS)'', ``MAS AIR/FL SE'', ``THRTL POS SEN'', ``O2 SEN'' and ``INJ
PULSE'' when revving engine quickly up to 4,800 rpm under no load after warming up engine sufficiently.
Each value is for reference, the exact value may vary.
SEF754T
SEF598PB
TROUBLE DIAGNOSIS Ð General DescriptionKA
EC-66

SEF259QA
.pedal
.pedal
TROUBLE DIAGNOSIS Ð General DescriptionKA
Major Sensor Reference Graph in Data
Monitor Mode (Cont'd)
EC-67

ECM Terminals and Reference Value
PREPARATION
1. ECM is located behind the instrument lower panel.
2. Remove ECM harness protector.
3. Perform all voltage measurements with the connectors con-
nected. Extend tester probe as shown to perform tests eas-
ily.
ECM HARNESS CONNECTOR TERMINAL LAYOUT
SEF071U
MEF140D
MEC486B
SEF419H
TROUBLE DIAGNOSIS Ð General DescriptionKA
EC-68

ECM INSPECTION TABLE
Remarks: Specification data are reference values, and are measured between each terminal andV39(ECCS ground) with a voltme-
ter.
TERMINAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC voltage)
1 W/PU Ignition signalEngine is running.
Idle speedApproximately 0.3V
SEF058U
Engine is running.
Engine speed is 2,000 rpm.Approximately 0.7V
SEF059U
2WTachometer
(Models with
tachometer)Engine is running.
Idle speedApproximately 0.7V
SEF060U
Engine is running.
Engine speed is 2,000 rpm.Approximately 1.6V
SEF061U
3 W/G Ignition checkEngine is running.
Idle speedApproximately 13V
SEF062U
Engine is running.
Engine speed is 2,000 rpm.Approximately 13V
SEF063U
TROUBLE DIAGNOSIS Ð General DescriptionKA
ECM Terminals and Reference Value
(Cont'd)
EC-69

TERMINAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC voltage)
4 L/RECCS relay (Self-
shutoff)Engine is running.
Ignition switch ``OFF''
For a few seconds after turning ignition
switch ``OFF''0-1V
Ignition switch ``OFF''
A few seconds passed after turning ignition
switch ``OFF''BATTERY VOLTAGE
(11 - 14V)
6 B/P ECCS groundEngine is running.
Idle speedEngine ground
7W
Data link connec-
tor for CONSULTEngine is running.
Idle speedConnect CONSULT and select DATA
MONITOR mode.Approximately 0.1V
14 Y/RApproximately 3.5V
15 LApproximately4-6V
23 LApproximately 0V
11 G/RAir conditioner
relayEngine is running.
Both air conditioner switch and blower fan
switch are ``ON''. (Compressor operates.)Approximately 1V
Engine is running.
Air conditioner switch is ``OFF''.BATTERY VOLTAGE
(11 - 14V)
12 G/YSwirl control valve
control solenoid
valveEngine is running.
Idle speed0-1V
Engine is running.
Engine speed is above 3,600 rpm.BATTERY VOLTAGE
(11 - 14V)
13 B/P ECCS groundEngine is running.
Idle speedEngine ground
16 BMass air flow
sensorEngine is running.
(Warm-up condition)
Idle speed1.3 - 1.7V
Engine is running.
(Warm-up condition)
Engine speed is 2,500 rpm.1.7 - 2.1V
17 WMass air flow
sensor groundEngine is running.
(Warm-up condition)
Idle speed0.005 - 0.02V
18 LG/REngine coolant
temperature sen-
sorEngine is running.
Approximately 0 - 4.8V
Output voltage varies with
engine coolant temperature.
19 WHeated oxygen
sensorEngine is running.
After warming up sufficiently and engine
speed is 2,000 rpm0 - Approximately 1.0V
(periodically change)
20 LGThrottle position
sensorIgnition switch ``ON''
(Warm-up condition)
Accelerator pedal released0.35 - 0.65V
Ignition switch ``ON''
Accelerator pedal fully depressedApproximately 4V
21
29B/G
B/GSensors' groundEngine is running.
(Warm-up condition)
Idle speed0.001 - 0.02V
TROUBLE DIAGNOSIS Ð General DescriptionKA
ECM Terminals and Reference Value
(Cont'd)
EC-70

TERMINAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC voltage)
22
30WCamshaft position
sensor (REF)
(180É signal)Engine is running.
(Warm-up condition)
Idle speedApproximately 0.4V
SEF064U
Engine is running.(Warm-up condition)
Engine speed is 2,000 rpm.Approximately 0.4V
SEF065U
24 R/WMalfunction indi-
cator lampIgnition switch ``ON''
Approximately 1.5V
Engine is running.
Idle speedBATTERY VOLTAGE
(11 - 14V)
26 Y/LIntake air tem-
perature sensorEngine is running.
Approximately 0 - 4.8V
Output voltage varies with
intake air temperature.
31
40BCamshaft position
sensor (POS)
(1É signal)Engine is running.
(Warm-up condition)
Idle speedApproximately 2.5V
SEF066U
Engine is running.(Warm-up condition)
Engine speed is 2,000 rpm.Approximately 2.5V
SEF067U
TROUBLE DIAGNOSIS Ð General DescriptionKA
ECM Terminals and Reference Value
(Cont'd)
EC-71

TERMINAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC voltage)
32 W/LVehicle speed
sensorIgnition switch ``ON''
Jack up all wheels and run engine at idle in
1st position.Varies from 0 to 5V
SEF068U
34 B/Y Start signalIgnition switch ``ON''
Approximately 0V
Ignition switch ``START''
BATTERY VOLTAGE
(11 - 14V)
35 L/BNeutral position
switchIgnition switch ``ON''
Neutral position0V
Ignition switch ``ON''
Except the above gear positionApproximately 5V
36 B/L Ignition switchIgnition switch ``OFF''
0V
Ignition switch ``ON''
BATTERY VOLTAGE
(11 - 14V)
37 PUThrottle position
sensor power sup-
plyIgnition switch ``ON''
Approximately 5V
38
47B/WPower supply for
ECMIgnition switch ``ON''
BATTERY VOLTAGE
(11 - 14V)
39 B ECCS groundEngine is running.
Idle speedEngine ground
41 YAir conditioner
switchEngine is running.
Both air conditioner switch and blower fan
switch are ``ON''. (Compressor operates.)Approximately 0V
Engine is running.
Air conditioner switch is ``OFF''.BATTERY VOLTAGE
(11 - 14V)
43 GPower steering oil
pressure switchEngine is running.
Steering wheel is being turned.0V
Engine is running.
Steering wheel is not being turned.Approximately 5V
46 GY/LPower supply
(Back-up)Ignition switch ``OFF''
BATTERY VOLTAGE
(11 - 14V)
48 B ECCS groundEngine is running.
Idle speedEngine ground
TROUBLE DIAGNOSIS Ð General DescriptionKA
ECM Terminals and Reference Value
(Cont'd)
EC-72