NISSAN PATROL 1998 Y61 / 5.G Engine Control Owner's Guide

Disassembly and Assembly
CAUTION:
+Do not disassemble the parts not shown in the illustration
above.
+Before installing injection timing control valve, liberally
apply a coat of diesel fuel to O-ring and its mating area.
Insert injection timing control valve straight into bore in
fuel pump body. After properly positioning injection timing
control valve, visually check that fuel does not leak.
+After assembling the parts, erase Diagnostic Trouble Code
(DTC), and perform DTC CONFIRMATION PROCEDURE (or
OVERALL FUNCTION CHECK).
SEF668V
ELECTRONIC FUEL INJECTION PUMP
EC-29

DTC and MIL Detection Logic
When a malfunction is detected for the ®rst time, the malfunction (DTC) is stored in the ECM memory.
The MIL will light up each time the ECM detects malfunction. However, if the same malfunction is experienced
in two consecutive driving patterns and the engine is still running, the MIL will stay lit up. For diagnostic items
causing the MIL to light up, refer to ``DIAGNOSTIC TROUBLE CODE INDEX'', EC-1.
Diagnostic Trouble Code (DTC)
HOW TO READ DTC
The diagnostic trouble code can be read by the following methods.
1. The number of blinks of the malfunction indicator lamp in the Diagnostic Test Mode II (Self-Diagnostic
Results) Examples: 11, 13, 14, etc.
These DTCs are controlled by NISSAN.
2. CONSULT Examples: ``CAM POS SEN (PUMP)'', etc.
+Output of the trouble code means that the indicated circuit has a malfunction. However, in the Mode
II it does not indicate whether the malfunction is still occurring or occurred in the past and returned
to normal.
CONSULT can identify them. Therefore, using CONSULT (if available) is recommended.
HOW TO ERASE DTC
The diagnostic trouble code can be erased 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. (Refer to EC-32.)
+If the battery terminal is disconnected, the diagnostic trouble code will be lost within 24 hours.
+When you erase the DTC, using CONSULT is easier and quicker than switching the diagnostic test
modes.
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 (No Tools)
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. (Refer to EC-32.)
SEF691S
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
EC-30

Malfunction Indicator Lamp (MIL)
1. The malfunction indicator lamp will light up when the ignition
switch is turned ON without the engine running. This is a bulb
check.
+If the malfunction indicator lamp does not light up, refer to EL
section (``WARNING LAMPS AND CHIME'') or see EC-188.
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.
If MIL illuminates or blinks irregularly after starting engine,
water may have accumulated in fuel ®lter. Drain water from
fuel ®lter.
ON BOARD DIAGNOSTIC SYSTEM FUNCTION
The on board diagnostic system has the following three functions.
1. BULB CHECK : This function checks the MIL bulb for damage (blown, open circuit,
etc.).
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.
3. SELF-DIAGNOSTIC
RESULTS: This function allows diagnostic trouble codes to be read.
Refer to ``HOW TO SWITCH DIAGNOSTIC TEST MODES'' on next page.
ConditionDiagnostic
Test Mode IDiagnostic
Test Mode II
Ignition switch
in ``ON'' posi-
tion
Engine
stopped
BULB CHECKSELF-DIAGNOSTIC
RESULTS
Engine
running
MALFUNCTION
WARNINGÐ
SEF051P
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
EC-31

HOW TO SWITCH DIAGNOSTIC TEST MODES
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
cNG
Check MIL circuit.
(See EC-188.)
OK
.
cNG
Repair harness or
connectors.
OK
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.
cNG
Check MIL circuit and data link connector for
CONSULT circuit. (See EC-188.)
OK
.
NG
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 RESULTS
.jBjA
.
.
.
.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Malfunction Indicator Lamp (MIL) (Cont'd)
EC-32

jB
m
jA
Data link connector for CONSULT
(Connect CHK and IGN terminals with a suit-
able harness.)
Wait at least 2 seconds.
Data link connector for CONSULT
(Disconnect the suitable harness between
CHK and IGN terminals.)
If the suitable harness is disconnected at this
time, the diagnostic trouble code will be
erased from the backup memory in the ECM.
+Switching the modes is not possible when the engine
is running.
+When 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..
.
.
.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Malfunction Indicator Lamp (MIL) (Cont'd)
EC-33

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. Refer to EL section (``WARNING LAMPS AND CHIME'') or see EC-188.
DIAGNOSTIC TEST MODE IÐMALFUNCTION WARNING
MALFUNCTION
INDICATOR LAMPCondition
ONWhen the malfunction is detected or the ECM's CPU is malfunctioning. (Refer to ``MIL Illumination'' of the
``DIAGNOSTIC TROUBLE CODE INDEX'', EC-1.)
OFF No malfunction.
+These Diagnostic Trouble Code Numbers are clari®ed 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 5 seconds (0.6 sec x
4 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 accelerator position sensor circuit.
In this way, all the detected malfunctions are classi®ed by their diagnostic trouble code numbers. The DTC
``55'' refers to no malfunction. (See DIAGNOSTIC TROUBLE CODE INDEX, 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 DIAGNOS-
TIC TEST MODES'' on previous page.)
+If the battery terminal is disconnected, the diagnostic trouble code will be lost from the backup
memory within 24 hours.
+Be careful not to erase the stored memory before starting trouble diagnoses.
+If the MIL blinks or ``NATS MALFUNCTION'' is displayed on
``SELF-DIAG RESULTS'' screen, perform self-diagnostic
results mode with CONSULT using NATS program card
(NATS-E940). Refer to EL section.
+Con®rm no self-diagnostic results of NATS is displayed
before touching ``ERASE'' in ``SELF-DIAG RESULTS'' mode
with CONSULT.
+When 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 DESCRIPTION
Malfunction Indicator Lamp (MIL) (Cont'd)
EC-34

RELATIONSHIP BETWEEN MIL, DTC, CONSULT AND DRIVING PATTERNS
*1: When a malfunction is detected, MIL will light up.
*2: When the same malfunction is detected in two consecutive
driving patterns, MIL will stay lit up.
*3: MIL will go off after vehicle is driven three times without
any malfunctions.
*4: When a malfunction is detected for the ®rst time, the DTC
will be stored in ECM.*5: The DTC will not be displayed any longer after vehicle is
driven 40 times without the same malfunction.
(The DTC still remain in ECM.)
*6: Other screens except SELF-DIAGNOSTIC RESULTS &
DATA MONITOR (AUTO TRIG) cannot display the mal-
function. DATA MONITOR (AUTO TRIG) can display the
malfunction at the moment it is detected.
SEF659S
RUN (ON)
STOP (OFF)
ON
OFF
DISPLAY
NO
DISPLAY
DTC exists
DTC does
not exist
COUNTER Driving Pattern
Engine
(GN)
MIL
ECM Diagnostic
trouble
code
CONSULT
SELF-
DIAGNOSTIC
RESULTS
SCREEN
&
DATA MONITOR
(AUTO TRIG) SCREEN
SELF-
DIAGNOSTIC
RESULTS
SCREENNG DetectionThis driving pattern does not satisfy
self-diagnostic condition.
This driving pattern satis®es
self-diagnostic condition.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Malfunction Indicator Lamp (MIL) (Cont'd)
EC-35

CONSULT
CONSULT INSPECTION PROCEDURE
1. Turn off ignition switch.
2. Connect ``CONSULT'' to data link connector for CONSULT.
(Data link connector for CONSULT is located under the hood
opener.)
3. Turn on ignition switch.
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.
SEF669V
SEF895K
SEF660S
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
EC-36

ECCS COMPONENT PARTS/CONTROL SYSTEMS APPLICATION
ItemDIAGNOSTIC TEST MODE
SELF-DIAG-
NOSTIC
RESULTSDATA
MONITORACTIVE
TEST
ECCS COMPONENT PARTS
INPUTCamshaft position sensor (PUMP) X X
Engine coolant temperature sensor X X
Control sleeve position sensor X X
Fuel temperature sensor X X
Vehicle speed sensor X X
Accelerator position sensor X X X
Accelerator position switch X X
Accelerator switch (F/C) X X
Crankshaft position sensor (TDC) X X
Needle lift sensor X
Ignition switch (start signal) X
Neutral position switch X
Battery voltage X
Air conditioner switch X
Heat up switch X
Mass air ¯ow sensor X X
Charge air temperature sensor X
OUTPUTInjection timing control valve X X X
Fuel cut solenoid valve X X X
Glow relayXX
EGRC-solenoid valve A, B & throttle control solenoid valve X X
Cooling fan relay X X
Charge air cooler fan relay X
X: Applicable
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT (Cont'd)
EC-37

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
CKPSzRPM
(TDC) [rpm]
jj
+The engine speed computed from the
crankshaft position sensor (TDC) signal
is displayed.
CKPSzRPM
(REF) [rpm]
jj
+The engine speed [determined by the
time between pulses from the crankshaft
position sensor (TDC) signal] is dis-
played.
CMPSzRPM -
PUMP [rpm]
jj
+The engine speed computed from the
camshaft position sensor (PUMP) signal
is displayed.
COOLAN TEMP/S
[ÉC] or [ÉF]
jj
+The engine coolant temperature (deter-
mined by the signal voltage of the engine
coolant temperature sensor) is displayed.+When the engine coolant temperature
sensor is open or short-circuited, ECM
enters fail-safe mode. The engine cool-
ant temperature determined by the ECM
is displayed.
VHCL SPEED SE
[km/h] or [mph]
jj+The vehicle speed computed from the
vehicle speed sensor signal is displayed.
FUEL TEMP SEN
[ÉC] or [ÉF]
jj
+The fuel temperature (determined by the
signal voltage of the fuel temperature
sensor) is displayed.
ACCEL POS SEN [V]
jj+The accelerator position sensor signal
voltage is displayed.
FULL ACCEL SW
[ON/OFF]
jj+Indicates [ON/OFF] condition from the
accelerator position switch signal.
ACCEL SW (FC)
[OPEN/CLOSE]
jj+Indicates [OPEN/CLOSE] condition from
the accelerator switch (FC) signal.
OFF ACCEL SW
[ON/OFF]
jj+Indicates [ON/OFF] condition from the
accelerator position switch signal.
C/SLEEV POS/S [V]
jj+The control sleeve position sensor signal
voltage is displayed.
BATTERY VOLT [V]
jj+The power supply voltage of ECM is dis-
played.
P/N POSI SW
[ON/OFF]
jj+Indicates [ON/OFF] condition from the
park/neutral position switch signal.
START SIGNAL
[ON/OFF]
jj+Indicates [ON/OFF] condition from the
starter signal.+After starting the engine, [OFF] is dis-
played regardless of the starter signal.
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT (Cont'd)
EC-38