engine NISSAN PICK-UP 1998 Manual PDF

Introduction
The ECM (ECCS control module) has an on board diagnostic system, which detects malfunctions related to
engine sensors or actuators. Self-diagnosis items are listed in ``DIAGNOSTIC TROUBLE CODE INDEX'',
EC-1.
The malfunction indicator lamp (MIL) on the instrument panel lights up when a malfunction is detected, or
when the ECM enters fail-safe mode (Refer to EC-61).
Diagnostic Trouble Code (DTC)
HOW TO CONFIRM MALFUNCTION ITEMS
Malfunction items can be confirmed by the following methods.
1. The number of blinks of the malfunction indicator lamp in the Diagnostic Test Mode II (Self- Diag-
nostic Results) indicates the DTC. Examples: 11, 21 etc.
2. CONSULT displays the malfunctioning component or system in ``SELF DIAGNOSTIC RESULTS''
mode.
lOutput of a DTC indicates a malfunction. However, Mode II does not indicate whether the mal-
function is still occurring or has occurred in the past and has returned to normal.
CONSULT can identify malfunction status as shown below. Therefore, using CONSULT (if avail-
able) is recommended.
A sample of CONSULT display is shown at left. The malfunction
is displayed in SELF-DIAGNOSTIC RESULTS mode of CON-
SULT. Time data indicates how many times the vehicle was
driven after the last detection of a malfunction.
If the malfunction is being detected currently, the time data will
be ``0''.
HOW TO ERASE DTC
The DTC can be erased from the back-up memory in the ECM by the following methods.
Selecting ``ERASE'' in the SELF- DIAG RESULTS'' mode with CONSULT
Changing the diagnostic test mode from Diagnostic Test Mode II to Mode I by turning the mode
selector on the ECM (RHD model only) or connecting the data link connector for CONSULT terminals.
(Refer to EC-39, 41)
lIf the battery terminal is disconnected, the DTC will be lost within 24 hours.
lErasing the DTC, using CONSULT is easier and quicker than switching the mode selector on the
ECM (RHD model only) or connecting the data link connector for CONSULT terminals.
SEF854T
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONKA
EC-36

How to erase DTC (With CONSULT)
1. If the ignition switch stays ``ON'' after repair work, be sure to turn ignition switch ``OFF'' once. Wait at
least 5 seconds and then turn it ``ON'' (engine stopped) again.
2. Turn CONSULT ``ON'' and touch ``ENGINE''.
3. Touch ``SELF-DIAG RESULTS''.
4. Touch ``ERASE''. (The DTC in the ECM will be erased.)
How to erase DTC (Without CONSULT)
1. If the ignition switch stays ``ON'' after repair work, be sure to turn ignition switch ``OFF'' once. Wait at
least 5 seconds and then turn it ``ON'' again.
2. Change the diagnostic test mode from Mode II to Mode I by turning the mode selector on the ECM (RHD
model only) or connecting the data link connector for CONSULT terminals. (See EC-39, 41)
SEF054U
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONKA
Diagnostic Trouble Code (DTC) (Cont'd)
EC-37

Malfunction Indicator Lamp (MIL)
The malfunction indicator lamp is located on the instrument
panel.
1. The malfunction indicator lamp will light up when the ignition
switch is turned ON without the engine running. This is for
checking the blown lamp.
lIf the malfunction indicator lamp does not light up, see the
WARNING LAMPS AND CHIME in the EL section.
(Or see EC-173, 174.)
2. When the engine is started, the malfunction indicator lamp
should go off.
If the lamp remains on, the on board diagnostic system has
detected an engine system malfunction.
ON BOARD DIAGNOSTIC SYSTEM FUNCTION
The on board diagnostic system has the following four functions.
Diagnostic Test Mode I
1. BULB CHECK : This function checks the bulb for damage (blown, open circuit, etc.) of
the malfunction indicator lamp.
If the MIL does not come on, check MIL circuit and ECM test mode
selector. (See next page.)
2. MALFUNCTION
WARNING: This is a usual driving condition. When a malfunction is detected, the
MIL will light up to inform the driver that a malfunction has been
detected.
Diagnostic Test Mode II
3. SELF-DIAGNOSTIC
RESULTS: This function allows DTCs to be read.
4. HEATED OXYGEN
SENSOR MONITOR: This function allows the fuel mixture condition (lean or rich), monitored
by heated oxygen sensor, to be read.
MIL Flashing without DTC
If the ECM is in Diagnostic Test Mode II, the MIL may flash when the engine is running. In this case, check
ECM test mode selector following ``HOW TO SWITCH DIAGNOSTIC TEST MODES'' on next page.
How to switch the diagnostic test (function) modes and details of the above functions are described later.
(See page EC-39, 41.)
ConditionDiagnostic
Test Mode IDiagnostic
Test Mode II
Ignition switch
in ``ON'' posi-
tion
Engine
stopped
BULB CHECKSELF-DIAGNOSTIC
RESULTS
Engine
running
MALFUNCTION
WARNINGHEATED OXYGEN
SENSOR MONI-
TOR
SEF055U
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONKA
EC-38

HOW TO SWITCH DIAGNOSTIC TEST MODES (LHD models)
Turn ignition switch ``ON''.
(Do not start engine.)
c
Diagnostic Test Mode I Ð BULB
CHECK. Refer to previous page.
MIL should come on.
OK
cNGCheck MIL circuit.
(See EC-173.)
OK
cNG
Repair harness or
connectors.
b
cG
Start engine.
cDiagnostic Test
Mode I
Ð MALFUNC-
TION WARN-
ING.
Refer to previ-
ous page.
Data link connector for CONSULT
(Connect CHK and IGN terminals with a
suitable harness.)
MIL should go off.
OK
cNG
Check MIL circuit and data link connector for
CONSULT circuit. (See EC-173.)
OK NG
Check ECM fail-
safe.
(See EC-61.)
Repair harness or
connectors.
OK
Wait at least 2 seconds.
b
Data link connector for CONSULT
(Disconnect the suitable harness
between CHK and IGN terminals.)
DIAGNOSTIC TEST MODE II
Ð SELF-DIAGNOSTIC RESULTScG
Start engine.
cDiagnostic Test
Mode II
Ð HEATED
OXYGEN
SENSOR
MONITOR
VBVA
.
.
..
.
.
.
.
.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONKA
Malfunction Indicator Lamp (MIL) (Cont'd)
EC-39

VBmVA
.
Data link connector for CONSULT
(Connect CHK and IGN terminals with a
suitable harness.)
Wait at least 2 seconds.
*1
Data link connector for CONSULT
(Disconnect the suitable harness
between CHK and IGN terminals.)
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.
*1: If the 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-40

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 IIÐHEATED OXYGEN SENSOR MONITOR
In this mode, the MALFUNCTION INDICATOR LAMP displays the condition of the fuel mixture (lean or rich)
which is monitored by the heated oxygen sensor.
MALFUNCTION INDICATOR LAMP Fuel mixture condition in the exhaust gasAir fuel ratio feedback control
condition
ON Lean
Closed loop control
OFF Rich
*Remains ON or OFF Any condition Open loop control
*: Maintains conditions just before switching to open loop.
To check the heated oxygen sensor function, start engine in the Diagnostic Test Mode II and warm it up
until engine coolant temperature indicator points to the middle of the gauge.
Next run engine at about 2,000 rpm for about 2 minutes under no-load conditions. Then make sure that the
MALFUNCTION INDICATOR LAMP comes ON more than 5 times every 10 seconds when measured at
2,000 rpm under no-load.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONKA
Malfunction Indicator Lamp (MIL) (Cont'd)
EC-44

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