1998 NISSAN PICK-UP Ignition

HOW TO SWITCH DIAGNOSTIC TEST MODES (RHD models)
Turn ignition switch ``ON''. (Do not
start engine.)
cDiagnostic Test Mode I Ð BULB CHECK.
Refer to previous page.
MIL should come on.
OK
cNGCheck MIL cir-
cuit.
(See EC-174.)
OK
cNG
Repair harness
or connectors.
bYes
Check whether
ECM test mode
selector can be
turned counter-
clockwise.cNo
Repair or
replace ECM
test mode
selector.
cG
Start engine.
cDiagnostic Test
Mode I
Ð MALFUNC-
TION
WARNING.
Refer to pre-
vious page.
Data link connector for CONSULT
(Connect CHK and IGN terminals
with a suitable harness.)
MIL should go off. (Turn diagnostic test mode
selector on ECM fully clockwise.)
MIL should go off.or
OK
cNG
Check MIL circuit and data link connector
for CONSULT circuit. (See EC-174.)
OK NG
Check ECM
fail-safe.
(See EC-61.)
OKRepair harness
or connectors.OK
Wait at least 2 seconds.
b
Data link connector for CONSULT
(Disconnect the suitable harness
between CHK and IGN terminals.) (Turn diagnostic test mode
selector fully counterclockwise.)or
DIAGNOSTIC TEST MODE II
Ð SELF-DIAGNOSTIC RESULTS
VBVA
.
.
.
..
.
.
.
.
.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONKA
Malfunction Indicator Lamp (MIL) (Cont'd)
EC-41

VBmVA
Data link connector for CONSULT
(Connect CHK and IGN terminals
with a suitable harness.) (Turn diagnostic test mode
selector on ECM fully clockwise.)
MIL should go off.or
Wait at least 2 seconds.
*1
Data link connector for CONSULT
(Disconnect the suitable harness
between CHK and IGN terminals.) (Turn diagnostic test mode
selector fully counterclockwise.)or
lSwitching the modes is not possible
when the engine is running.
lWhen ignition switch is turned off
during diagnosis, power to ECM will
drop after approx. 5 seconds.
The diagnosis will automatically
return to Diagnostic Test Mode I.
lTurn back diagnostic test mode
selector to the fully counterclock-
wise position whenever vehicle is in
use.
*1: If the selector is turned fully counterclock-
wise or suitable harness is disconnected at
this time, the diagnostic trouble code will be
erased from the backup memory in the ECM.
.
.
.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONKA
Malfunction Indicator Lamp (MIL) (Cont'd)
EC-42

DIAGNOSTIC TEST MODE IÐBULB CHECK
In this mode, the MALFUNCTION INDICATOR LAMP on the instrument panel should stay ON. If it remains
OFF, check the bulb. (See the WARNING LAMPS AND CHIME in the EL section. Or see EC-173, 174.)
DIAGNOSTIC TEST MODE IÐMALFUNCTION WARNING
MALFUNCTION
INDICATOR LAMPCondition
ON When the malfunction is detected (Refer to EC-1.) or the ECM's CPU is malfunctioning.
OFF No malfunction
lThese Diagnostic Trouble Code Numbers are clarified in Diagnostic Test Mode II (SELF-DIAGNOSTIC
RESULTS).
DIAGNOSTIC TEST MODE IIÐSELF-DIAGNOSTIC RESULTS
In this mode, a diagnostic trouble code is indicated by the number of blinks of the MALFUNCTION INDICA-
TOR LAMP as shown below.
Long (0.6 second) blinking indicates the number of ten digits, and short (0.3 second) blinking indicates the
number of single digits. For example, the malfunction indicator lamp blinks 4 times for about 5 seconds (0.6
sec x 8 times) and then it blinks three times for about 1 second (0.3 sec x 3 times). This indicates the DTC
``43'' and refers to the malfunction of the throttle position sensor.
In this way, all the detected malfunctions are classified by their diagnostic trouble code numbers. The DTC
``55'' refers to no malfunction. (See DIAGNOSTIC TROUBLE CODE INDEX, refer to page EC-1.)
How to erase diagnostic test mode II (Self-diagnostic results)
The diagnostic trouble code can be erased from the backup memory in the ECM when the diagnostic test
mode is changed from Diagnostic Test Mode II to Diagnostic Test Mode I. (Refer to ``HOW TO SWITCH
DIAGNOSTIC TEST MODES''.)
lIf the battery terminal is disconnected, the diagnostic trouble code will be lost from the backup
memory within 24 hours.
lBe careful not to erase the stored memory before starting trouble diagnoses.
lIf the MIL blinks or ``NATS MALFUNCTION'' is displayed
on ``SELF-DIAG RESULTS'' screen, perform self-diag-
nostic results mode with CONSULT using NATS pro-
gram card (NATS-E940). Refer to EL section.
lConfirm no self-diagnostic results of NATS is displayed
before touching ``ERASE'' in ``SELF-DIAG RESULTS''
mode with CONSULT.
lWhen replacing ECM, initialisation of NATS V2.0 system
and registration of all NATS V2.0 ignition key IDs must
be carried out with CONSULT using NATS program card
(NATS-E940).
Therefore, be sure to receive all keys from vehicle
owner.
Regarding the procedures of NATS initialisation and
NATS ignition key ID registration, refer to CONSULT
operation manual, NATS V2.0.
SEF212NA
SEF288Q
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONKA
Malfunction Indicator Lamp (MIL) (Cont'd)
EC-43

CONSULT
CONSULT INSPECTION PROCEDURE
1. Turn ignition switch OFF.
2. Connect ``CONSULT'' to data link connector for CONSULT.
(Data link connector for CONSULT is located behind the fuse
box cover.)
3. Turn ignition switch ON.
4. Touch ``START''.
5. Touch ``ENGINE''.
6. Perform each diagnostic test mode according to each service
procedure.
For further information, see the CONSULT Operation
Manual.
SEF056U
SEF057U
SBR455D
SEF895K
SEF288S
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONKA
EC-45

FUNCTION
Diagnostic test mode Function
Work supportA technician can adjust some devices faster
and more accurately by following indications
on CONSULT.
Self-diagnostic resultsSelf-diagnostic results can be read and
erased quickly.
Data monitor Input/Output data in the ECM can be read.
Active testCONSULT drives some actuators apart from
the ECM's and also shifts some parameters in
a specified range.
Function testConducted by CONSULT instead of a techni-
cian to determine whether each system is
``OK'' or ``NG''.
ECM part number ECM part number can be read.
WORK SUPPORT MODE
WORK ITEM CONDITION USAGE
THRTL POS SEN ADJ CHECK THE THROTTLE POSITION SENSOR SIGNAL.
ADJUST IT TO THE SPECIFIED VALUE BY ROTATING
THE SENSOR BODY UNDER THE FOLLOWING CONDI-
TIONS.
lIGN SW ``ON''
lENG NOT RUNNING
lACC PEDAL NOT PRESSEDWhen adjusting throttle position
sensor initial position
IGNITION TIMING ADJ
lIGNITION TIMING FEEDBACK CONTROL WILL BE
HELD BY TOUCHING ``START''. AFTER DOING SO,
ADJUST IGNITION TIMING WITH A TIMING LIGHT BY
TURNING THE CRANKSHAFT POSITION SENSOR.When adjusting initial ignition
timing
IACV-AAC VALVE ADJ SET ENGINE SPEED AT THE SPECIFIED VALUE
UNDER THE FOLLOWING CONDITIONS.
lENGINE WARMED UP
lNO-LOAD
FUEL PRESSURE RELEASE
lFUEL PUMP WILL STOP BY TOUCHING ``START''
DURING IDLING.
CRANK A FEW TIMES AFTER ENGINE STALLS.When releasing fuel pressure
from fuel line
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONKA
CONSULT (Cont'd)
EC-46

ECCS COMPONENT PARTS/CONTROL SYSTEMS APPLICATION
ItemDIAGNOSTIC TEST MODE
WORK
SUPPORTSELF-DIAG-
NOSTIC
RESULTSDATA
MONITORACTIVE
TESTFUNCTION
TEST
ECCS COMPONENT PARTS
INPUT
Camshaft position sensor X X
Mass air flow sensor X X
Engine coolant temperature
sensorXXX
Heated oxygen sensor X
Vehicle speed sensor X X
Throttle position sensor X X X X
Intake air temperature sensor X X
Ignition switch (start signal) X X
Closed throttle position switch X X
Air conditioner switch X
Neutral position switch X X
Power steering oil pressure
switchXX
Battery voltage X
OUTPUT
Injectors X X X
Power transistor (Ignition timing) XX (Ignition
signal)XXX
IACV-AAC valve X X X X
Air conditioner relay X
Fuel pump relay X X X X
Swirl control valve control
solenoid valveXXX
EVAP canister purge control
solenoid valve*XXX
X: Applicable
* : This item is indicated as ``EGRC SOL/V'' on the CONSULT screen.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONKA
CONSULT (Cont'd)
EC-47

SELF-DIAGNOSTIC MODE
Regarding items detected in ``SELF-DIAG RESULTS'' mode, refer to ``DIAGNOSTIC TROUBLE CODE
INDEX'', EC-1.
DATA MONITOR MODE
Monitored item
[Unit]ECM
input
signalsMain
signalsDescription Remarks
CMPSRPM
(POS) [rpm]
jj
lIndicates the engine speed computed
from the POS signal (1É signal) of the
camshaft position sensor.
MAS AIR/FL SE [V]
jjlThe signal voltage of the mass air flow
sensor is displayed.lWhen the engine is stopped, a certain
value is indicated.
COOLAN TEMP/S
[ÉC] or [ÉF]
jj
lThe engine coolant temperature (deter-
mined by the signal voltage of the engine
coolant temperature sensor) is displayed.lWhen the engine coolant temperature
sensor is open or short-circuited, ECM
enters fail-safe mode. The engine coolant
temperature determined by the ECM is
displayed.
O2 SEN [V]
jjlThe signal voltage of the heated oxygen
sensor is displayed.lLHD models only
M/R F/C MNT
[RICH/LEAN]
jj
lDisplay of heated oxygen sensor signal
during air-fuel ratio feedback control:
RICH ... means the mixture became
``rich'', and control is being affected
toward a leaner mixture.
LEAN ... means the mixture became
``lean'', and control is being affected
toward a rich mixture.lAfter turning ON the ignition switch,
``RICH'' is displayed until air-fuel mixture
ratio feedback control begins.
lWhen the air-fuel ratio feedback is
clamped, the value just before the clamp-
ing is displayed continuously.
lLHD models only
VHCL SPEED SE
[km/h] or [mph]
jjlThe vehicle speed computed from the
vehicle speed sensor signal is displayed.
BATTERY VOLT [V]
jjlThe power supply voltage of ECM is dis-
played.
THRTL POS SEN [V]
jjlThe throttle position sensor signal volt-
age is displayed.
INT/A TEMP SE
[ÉC] or [ÉF]
j
lThe intake air temperature (determined
by the signal voltage of the intake air
temperature sensor) is indicated.
START SIGNAL
[ON/OFF]
jjlIndicates [ON/OFF] condition from the
starter signal.lAfter starting the engine, [OFF] is
displayed regardless of the starter signal.
CLSD THL/POSI
[ON/OFF]
jj
lIndicates [ON/OFF] condition from the
throttle position sensor signal.
AIR COND SIG
[ON/OFF]
jj
lIndicates [ON/OFF] condition of the air
conditioner switch as determined by the
air conditioner signal.
P/N POSI SW
[ON/OFF]
jj
lIndicates [ON/OFF] condition from the
park/neutral position switch signal.
PW/ST SIGNAL
[ON/OFF]
jj
l[ON/OFF] condition of the power steering
oil pressure switch determined by the
power steering oil pressure signal is indi-
cated.
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONKA
CONSULT (Cont'd)
EC-48

Monitored item
[Unit]ECM
input
signalsMain
signalsDescription Remarks
INJ PULSE [msec]
j
lIndicates the actual fuel injection pulse
width compensated by ECM according to
the input signals.lWhen the engine is stopped, a certain
computed value is indicated.
IGN TIMING [BTDC]
j
lIndicates the ignition timing computed by
ECM according to the input signals.lWhen the engine is stopped, a certain
value is indicated.
IACV-AAC/V [%]
j
lIndicates the idle air control valve (AAC
valve) control value computed by ECM
according to the input signals.
A/F ALPHA [%]
j
lThe mean value of the air-fuel ratio feed-
back correction factor per cycle is indi-
cated.lWhen the engine is stopped, a certain
value is indicated.
lThis data also includes the data for the
air-fuel ratio learning control.
AIR COND RLY
[ON/OFF]
j
lThe air conditioner relay control condition
(determined by ECM according to the
input signal) is indicated.
FUEL PUMP RLY
[ON/OFF]
j
lIndicates the fuel pump relay control con-
dition determined by ECM according to
the input signals.
SWRL CONT S/V
[ON/OFF]
j
lThe control condition of the swirl control
valve control solenoid valve (determined
by the ECM according to the input signal)
is indicated.
ON ... Swirl control valve is closed
OFF ... Swirl control valve is open
EGRC SOL/V
(EVAP canister purge
control solenoid
valve) [ON/OFF]
j
lThe control condition of the EVAP canis-
ter purge control solenoid valve (deter-
mined by ECM according to the input
signal) is indicated.
ON ... EVAP canister purge control is not
operating
OFF ... EVAP canister purge control is
operational.
VOLTAGE
[V]
lVoltage measured by the voltage probe.
PULSE
[msec] or [Hz] or [%]
lPulse width, frequency or duty cycle
measured by the pulse probe.lOnly ``#'' is displayed if item is unable to
be measured.
lFigures with ``#''s are temporary ones.
They are the same figures as an actual
piece of data which was just previously
measured.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONKA
CONSULT (Cont'd)
EC-49