1998 NISSAN PICK-UP engine

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

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

TERMINAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC voltage)
116 B/P ECCS groundEngine is running.
Idle speedEngine ground
TROUBLE DIAGNOSIS Ð General DescriptionKA
ECM Terminals and Reference Value
(Cont'd)
EC-74

Main Power Supply and Ground Circuit
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)
4 L/R ECCS 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)
36 B/L Ignition switchIgnition switch ``OFF''
0V
Ignition switch ``ON''
BATTERY VOLTAGE
(11 - 14V)
38
47B/W Power supply for ECM Ignition switch ``ON''
BATTERY VOLTAGE
(11 - 14V)
46 GY/L Power supply (Back-up) Ignition switch ``OFF''
BATTERY VOLTAGE
(11 - 14V)
109 B/W Current returnEngine is running.
Idle speedBATTERY VOLTAGE
(11 - 14V)
TROUBLE DIAGNOSIS FOR POWER SUPPLYKA
EC-75

INSPECTION START
Start engine.
Is engine running?
Yes
cNo
CHECK POWER SUPPLY-I.
1. Turn ignition switch ``ON''.
2. Check voltage between
ECM terminal
V36and
ground with CONSULT or
tester.
Voltage: Battery voltage
If NG, check the following.
lHarness connectorsF55,M47(RHD models)
lHarness for open or short
between ECM and ignition
switch
If NG, repair harness or con-
nectors.
OK
Go to ``CHECK GROUND
CIRCUIT'' on next page.
CHECK POWER SUPPLY-II.
1. Stop engine.
2. Check voltage between ECM termi-
nal
V46and ground with CONSULT
or tester.
Voltage: Battery voltage
OK
cNG
Check the following.
lHarness connectorsF54,M48(RHD models)
lHarness connectorsM5,E101
l10A fuse
lHarness for open or short
between ECM and battery
If NG, repair harness or con-
nectors.
CHECK POWER SUPPLY-III.
1. Turn ignition switch ``ON'' and then
turn ``OFF''.
2. Check voltage between ECM termi-
nals
V38,V47,109and ground with
CONSULT or tester.
Voltage:
After turning ignition switch
``OFF'', battery voltage will exist
for a few seconds, then drop to
approximately 0V.
NG
cOK
Go to ``CHECK GROUND
CIRCUIT'' on next page.
Case-1: Battery voltage does
not exist.
Case-2: Battery voltage exists
for more than a few
seconds.
Case-1
cCase-2
Go to ``CHECK ECCS
RELAY'' on next page.
VA
SEF119U
SEF120U
SEF071U
SEF121U
.
.
.
.
.
TROUBLE DIAGNOSIS FOR POWER SUPPLYKA
Main Power Supply and Ground Circuit
(Cont'd)
EC-80