1998 NISSAN PATROL engine

SYMPTOM CHART
Symptom chart 1 (Malfunction is indicated in Diagnosis mode)
Symptom Possible causes Repair order
Speedometer and/or odo/trip
meter indicate(s) malfunction
in Diagnosis mode.+Speedometer (Uni®ed meter control unit)+Replace speedometer (uni®ed meter control unit).
Multiple meter/gauge indicate
malfunction in Diagnosis
mode.
One of tachometer/fuel gauge/
water temp. gauge indicates
malfunction in Diagnosis
mode.+Meter/Gauge
+Speedometer (Uni®ed meter control unit)1. Check resistance of meter/gauge indicating malfunction. If
the resistance is NG, replace the meter/gauge. Refer to
``METER/GAUGE RESISTANCE CHECK'', EL-114.
2. If the resistance is OK, replace speedometer (uni®ed meter
control unit).
Symptom chart 2 (No malfunction is indicated in Diagnosis mode)
Symptom Possible causes Repair order
Speedometer and odo/trip
meter are malfunctioning.1. Sensor
- Speedometer, Odo/Trip meter
2. FPC connector
3. Speedometer (Uni®ed meter control unit)1. Check vehicle speed sensor.
INSPECTION/VEHICLE SPEED SENSOR (Refer to EL-112.)
2. Check FPC connector. Refer to ``Flexible Print Circuit
(FPC)'', EL-109.
3. Replace speedometer (uni®ed meter control unit).
Multiple meter/gauge are mal-
functioning. (except
speedometer, odo/trip meter)1. FPC connector
2. Speedometer (Uni®ed meter control unit)1. Check FPC connector. Refer to ``Flexible Print Circuit
(FPC)'', EL-109.
2. Replace speedometer (uni®ed meter control unit).
One of tachometer/fuel gauge/
water temp. gauge is malfunc-
tioning.1. Sensor/Engine revolution signal
- Tachometer
- Fuel gauge
- Water temp. gauge
2. FPC connector
3. Speedometer (Uni®ed meter control unit)1. Check the sensor for malfunctioning meter/gauge.
INSPECTION/ENGINE REVOLUTION SIGNAL (Refer to
EL-113.)
INSPECTION/FUEL TANK GAUGE (Refer to EL-113.)
INSPECTION/THERMAL TRANSMITTER (Refer to EL-114.)
2. Check FPC connector. Refer to ``Flexible Print Circuit
(FPC)'', EL-109.
3. Replace speedometer (uni®ed meter control unit).
Before starting trouble diagnoses above, perform PRELIMINARY CHECK, EL-110.
POWER SUPPLY AND GROUND CIRCUIT CHECK
Power supply circuit check
Terminals Ignition switch position
Å@OFF ACC ON
j
33GroundBattery
voltageBattery
voltageBattery
voltage
j
9Ground 0V 0VBattery
voltage
If NG, check the following.
+7.5A fuse [No.
24, located in fuse block (J/B)]
+10A fuse [No.
28, located in fuse block (J/B)]
+Harness for open or short between fuse and combination meter
SEL419V
METER AND GAUGES
Trouble Diagnoses (Cont'd)
EL-111

INSPECTION/ENGINE REVOLUTION SIGNAL
Engine Check itemTerminals
ExplanationÅ@
RD28 (Injec-
tion)DC voltagej
44GroundHigher rpm = Higher volt-
age
Lower rpm = Lower volt-
age
Voltage should change
with rpm.
Engine Check item
TB45E, RD28
(Injection)+Harness for open or short and connection
INSPECTION/FUEL TANK GAUGE (MAIN)
CHECK GROUND CIRCUIT FOR FUEL
TANK GAUGE UNIT.
Check harness continuity between fuel
tank gauge unit terminalj
2and ground.
Continuity should exist.
OK
cNG
Repair harness or connec-
tor.
CHECK GAUGE UNITS.
Refer to ``FUEL TANK GAUGE UNIT
CHECK'' (EL-115).
OK
cNG
Repair or replace.
Refer to FE section.
CHECK HARNESS FOR OPEN OR
SHORT.
1. Disconnect combination connector and
fuel tank gauge unit connector.
2. Check continuity between combination
meter terminalj
46and fuel tank gauge
unit terminalj
1.
Continuity should exist.
3. Check continuity between combination
meter terminalj
46and ground.
Continuity should not exist.
OK
cNG
Repair harness or connec-
tor.
Fuel tank gauge is OK.
SEL423V
SEL461V
SEL424V
SEL425V
.
.
.
METER AND GAUGES
Trouble Diagnoses (Cont'd)
EL-113

System Description
This unit displays the following items:
+Earth magnetism and heading direction of vehicle.
+Outside air temperature.
+Caution for frozen road surfaces.
OUTSIDE TEMPERATURE DISPLAY
Push the switch when the ignition key is in the ``ACC'' or ``ON'' position. The outside temperature will be dis-
played in ``ÉF''.
+Selecting the indication range
Push the switch to change from ``ÉF'' to ``ÉC''.
+When the outside temperature drops below freezing point, ICE is displayed on the unit.
+When the outside temperature is between 55ÉC (130ÉF) and 70ÉC (158ÉF), the display shows 55ÉC
(130ÉF).
+When the outside temperature is lower than þ30ÉC (þ20ÉF) or higher than 70ÉC (158ÉF), the display shows
only ``- - -'' though it is operating. This is not a problem.
+The indicated temperature on the thermometer is not readily affected by engine heat. It changes only when
one of the following conditions is present.
a) The temperature detected by the ambient air temperature sensor is lower than the indicated temperature
on the thermometer.
b) The difference in temperature detected during a period of 40 seconds is less than 1ÉC (1.8ÉF) when vehicle
speed has been greater than 24 km/h (15 MPH) for more than 100 seconds.
(This is to prevent the indicated temperature from being affected by engine heat or cooling fan operation
during low-speed driving.)
c) The ignition key has been turned to the ``OFF'' position for more than 4 hours. (The engine is cold.)
DIRECTION DISPLAY
Push the switch when the ignition key is in the ``ACC'' or ``ON'' position. The direction will be displayed.
SEL713U
COMPASS AND THERMOMETER
EL-116

Trouble Diagnoses
PRELIMINARY CHECK FOR THERMOMETER
Turn the ignition key switch to the ``ACC''
position.
Cool down the ambient air temperature
sensor with water or ice, so that the indi-
cated temperature falls.
Does the indicated temperature fall?
Ye s
cNo
The system is malfunction-
ing..1
Leave the vehicle for 10 minutes, so that
the indicated temperature rises.
With the ignition key in the ``ACC''
position, disconnect and reconnect the
ambient air temperature sensor connector.
Does the indicated temperature rise?
Ye s
cNo
The system is malfunction-
ing..1
The system is OK.
.1: Check the system following ``INSPECTION/COMPASS AND THERMOM-
ETER''.
INSPECTION/COMPASS AND THERMOMETER
Symptom Possible causes Repair order
No display at all 1. 7.5A fuse
2. Ground circuit
3. Compass and thermometer1. Check 7.5A fuse [No.
9, located in fuse block (J/B)].
Turn the ignition switch ON and verify that battery positive
voltage is at terminalj
2of compass and thermometer.
2. Check ground circuit for compass and thermometer.
3. Replace compass and thermometer.
Forward direction indication
slips off the mark or incorrect.1. In manual correction mode
(Bar and display vanish.)
2. Zone variation change is not
done.1. Drive the vehicle and turn at an angle of 90É.
2. Perform the zone variation change.
Compass reading remains
unchanged.1. Vehicle speed sensor is not
entered.
2. Compass and thermometer1. Check harness for open or short between combination meter
terminalj
26and compass and thermometer terminalj8.
2. Replace compass and thermometer.
Displays wrong temperature
when ambient temperature is
between þ30ÉC (þ20ÉF) and
55ÉC (130ÉF). (See NOTE)1. Check operation
2. Ambient air temperature
sensor circuit
3. Vehicle speed sensor is not
entered.
4. Ambient air temperature
sensor
5. Compass and thermometer1. Perform preliminary check shown below.
2. Check harness for open or short between ambient air tem-
perature sensor and compass and thermometer.
3. Check harness for open or short between combination meter
terminalj
26and compass and thermometer terminalj8.
4. Replace ambient air temperature sensor.
5. Replace compass and thermometer.
NOTE:
+When the outside temperature is between 55ÉC (130ÉF) and 70ÉC (158ÉF), the display shows 55ÉC
(130ÉF). When the outside temperature is lower than þ30ÉC (þ20ÉF) or higher than 70ÉC (158ÉF), the
display shows only ``- - -''.
+The indicated temperature on the thermometer is not readily affected by engine heat. It changes
only when one of the following conditions (shown on next page) is present.
.
.
.
.
.
.
COMPASS AND THERMOMETER
EL-118

a) The temperature detected by the ambient air temperature sensor is lower than the indicated tem-
perature on the thermometer.
b) The difference in temperature detected during a period of 40 seconds is less than 1ÉC (1.8ÉF) when
vehicle speed has been greater than 24 km/h (15 MPH) for more than 100 seconds.
(This is to prevent the indicated temperature from being affected by engine heat or cooling fan
operation during low-speed driving.)
c) The ignition key has been turned to the ``OFF'' position for more than 4 hours. (The engine is cold.)
Calibration Procedure For Compass
The difference between magnetic North and geographical North
can sometimes be great enough to cause false compass readings.
In order for the compass to operate accurately in a particular zone,
it must be calibrated using the following procedure.
1. Determine your location on the worldwide magnetic variation
map on next page. Record your zone number.
2. Turn the ignition switch to ACC or ON position.
3. Push the ``Mode'' switch continuously for ®ve seconds until the
current zone entry number is displayed.
4. Press the ``Mode'' switch repeatedly until the desired zone num-
ber is displayed.
Once the desired zone number is displayed, stop pressing the
``Mode'' switch and the display will show compass direction after a
few seconds.
CORRECTION FUNCTIONS OF COMPASS
The direction display is equipped with automatic correction func-
tion. If the direction is not shown correctly, carry out initial correc-
tion.
INITIAL CORRECTION PROCEDURE FOR COMPASS
1. Pushing the ``Mode'' switch for about 10 seconds will enter the
initial correction mode. The direction bar starts blinking.
2. Turn the vehicle slowly in an open, safe place. The initial cor-
rection is completed in one or two turns.
NOTE:
In places where the terrestrial magnetism is extremely
disturbed, the initial correction may start automatically.
SEL065V
COMPASS AND THERMOMETER
Trouble Diagnoses (Cont'd)
EL-119

Electrical Components Inspection
FUEL WARNING LAMP SENSOR CHECK
+It will take a short time for the bulb to light.
NOTE: Inspection for sub fuel warning lamp sensor is the
same as for fuel warning lamp sensor.
OIL PRESSURE SWITCH CHECK
Oil pressure
kPa (bar, kg/cm2, psi)Continuity
Engine startMore than 10 - 20
(0.10 - 0.20, 0.1 - 0.2,1-3)NO
Engine stopLess than 10 - 20
(0.10 - 0.20, 0.1 - 0.2,1-3)YES
Check the continuity between the terminals of oil pressure switch
and body ground.
DIODE CHECK
+Check continuity using an ohmmeter.
+Diode is functioning properly if test results are as shown in the
®gure at left.
NOTE: Speci®cation may vary depending on the type of tester.
Before performing this inspection, be sure to refer to
the instruction manual for the tester to be used.
+Diodes for warning lamps are built into the combination meter
printed circuit.
MEL828F
MEL425F
CEL520
CEL740
WARNING LAMPS
EL-134

Trouble Diagnoses
RADIO
Symptom Possible causes Repair order
Radio inoperative (no digital
display and no sound from
speakers).
See NOTE.1. 10A fuse
2. Poor radio case ground
3. Radio1. Check 10A fuse [No.
10, located in fuse block (J/B)].
Turn ignition switch ON and verify battery positive volt-
age is present at terminalj
10of radio.
2. Check radio case ground.
3. Remove radio for repair.
Radio controls are operational,
but no sound is heard from
any speaker.1. Radio output
2. Radio1. Check radio output voltages.
2. Remove radio for repair.
Radio presets are lost when
ignition switch is turned OFF.1. 10A fuse
2. Radio1. Check 10A fuse (No.
56, located in fuse and fusible link
box) and verify battery positive voltage is present at terminal
j
6of radio.
2. Remove radio for repair.
Individual speaker is noisy or
inoperative.1. Speaker
2. Radio output
3. Speaker circuit
4. Radio1. Check speaker.
2. Check radio output voltages.
3. Check wires for open or short between radio and speaker.
4. Remove radio for repair.
Radio stations are weak or
noisy.1. Antenna
2. Poor radio ground
3. Radio1. Check antenna.
2. Check radio ground.
3. Remove radio for repair.
FM stations are weak or noisy
but AM stations are OK. (with
window antenna)1. Window antenna
2. Radio1. Check window antenna.
2. Remove radio for repair.
Radio generates noise in AM
and FM modes with engine
running.1. Poor radio ground
2. Loose or missing ground bonding straps
3. Ignition condenser or rear window defogger
noise suppressor condenser
4. Alternator
5. Ignition coil or secondary wiring
6. Radio1. Check radio ground.
2. Check ground bonding straps.
3. Replace ignition condenser or rear window defogger noise
suppressor condenser.
4. Check alternator.
5. Check ignition coil and secondary wiring.
6. Remove radio for repair.
Radio generates noise in AM
and FM modes with accesso-
ries on (switch pops and motor
noise).1. Poor radio ground
2. Antenna
3. Accessory ground
4. Faulty accessory1. Check radio ground.
2. Check antenna.
3. Check accessory ground.
4. Replace accessory.
NOTE:
If the radio has anti-theft function, check the anti-theft function of the radio before circuit inspection.
(Radios which have anti-theft function are equipped with a code indicator. For details, refer to EL-173.)
Speaker inspection
1. Disconnect speaker harness connector.
2. Measure the resistance between speaker terminalsj
1andj2.
+The resistance should be2-4W.
3. Using jumper wires, momentarily connect a 9V battery between speaker terminalsj
1andj2.
+A momentary hum or pop should be heard.
Antenna inspection
Using a jumper wire, clip an auxiliary ground between antenna and body.
+If reception improves, check antenna ground (at body surface).
+If reception does not improve, check main feeder cable for short circuit or open circuit.
Radio inspection
All voltage inspections are made with:
+Ignition switch ON or ACC
+Radio ON
+Radio connected (If removed for inspection, supply a ground to the case using a jumper wire.)
AUDIO
EL-172

DIAGNOSTIC PROCEDURE 6
(NATS release signal check)
Does engine start properly?
Ye s
cNo
Check NATS system.
CHECK NATS SIGNAL CIRCUIT.
1. Disconnect control unit connector and
NATS IMMU connector.
2. Check continuity between control unit
terminalj
9and NATS IMMU terminal
j
3(LHD models),j7(RHD models).
Continuity should exist.
3. Check continuity between control unit
terminalj
9and ground.
Continuity should not exist.
Refer to wiring diagram in EL-215
(LHD), EL-219 (RHD).
OK
cNG
Repair harness.
CHECK NATS RELEASE SIGNAL.
1. Connect control unit connector and
NATS IMMU connector.
2. Check voltage between control unit ter-
minalj
9and ground.
OK
cNG
Check NATS system.
Replace super lock control unit.
Ignition switch conditionVoltage
[V]
OFF
5
More than 10 seconds after ignition
switch turned ON
For 10 seconds after ignition switch
turned ONPulse
SEL493V
SEL494V
SEL495V
.
.
.
POWER DOOR LOCK Ð Super Lock Ð
Trouble Diagnoses (Cont'd)
EL-231