1999 NISSAN PICK-UP Repair Manual

Unified Control Meter System Description
UNIFIED CONTROL METER
Speedometer, odo/trip meter, tachometer, fuel gauge and water
temperature gauge are controlled totally by unified meter control
unit.
Meter/gauge Operation and Odo/Trip Meter
Segment Check in Diagnosis Mode
DIAGNOSIS FUNCTION
lOdo/trip meter segment can be checked in diagnosis mode.
lMeters/gauges can be checked in diagnosis mode.
HOW TO ALTERNATE DIAGNOSIS MODE
1. Turn ignition switch to ON and change odo/trip meter to
``TRIP A'' or ``TRIP B''.
2. Turn ignition switch to OFF.
3. Turn ignition switch to ON when pushing odo/trip meter
switch.
4. Confirm that trip meter indicates ``000.0''.
5. Push odo/trip meter switch more than three times within 5
seconds.
6. All odo/trip meter segments should be turned on.
NOTE: If some segments are not turned on, unified meter
control unit should be replaced.
At this point, the unified control meter is turned to diagnosis
mode.
7. Push odo/trip meter switch. Indication of each meter/gauge
should be as shown left during pushing odo/trip meter switch
if it is no malfunctioning.
NOTE: It takes about 1 minute for indication of fuel gauge
to become stable.
SEL110V
SEL111VA
METER AND GAUGES
EL-2058

Flexible Print Circuit (FPC) (Models with
Tachometer)
Tachometer, fuel gauge and water temperature gauge are con-
nected with unified meter control unit (speedometer) by Flexible
Print Circuit (FPC) connector. When replace or remove and
install unified control unit (speedometer), disconnect and con-
nect FPC connector according to the following steps.
DISCONNECT
1. Open connector cover.
2. Release connector lock by holding both ends of it and pull-
ing it up.
3. Disconnect FPC by pulling it up.
CONNECT
1. Insert FPC into connector and lock connector pushing FPC
downward.
2. Check secure connection of FPC.
3. Check continuity of check land terminals for secure connec-
tion of FPC.
Resistance: 0W
4. Close connector cover.
SEL427W
SEL109V
SEL162V
METER AND GAUGES
Meter/gauge Operation and Odo/Trip Meter
Segment Check in Diagnosis Mode (Cont'd)
EL-2059

Trouble Diagnoses/Models with Tachometer
PRELIMINARY CHECK
CHECK-IN
Can Diagnosis mode
be activated? Refer to
``Meter/Gauge Opera-
tion and Odo/Trip Meter
Segment Check in
Diagnosis Mode'',
EL-2058.
Yes
cNo
Do meter warning
lamps operate?
No
cYes
Check the screws
securing speedometer
and FPC.
(The screws are
located behind the
combination meter. For
details refer to
EL-2070.)cCan Diagnosis mode
be activated?
NomYes
Check power supply
and ground circuit.
Refer to ``POWER
SUPPLY AND
GROUND CIRCUIT
CHECK'', EL-2062.
Check meter/gauge
operation in Diagnosis
mode.b
Malfunction is indicated
in Diagnosis mode.No malfunction is indi-
cated in Diagnosis
mode.Replace speedometer
(unified meter control
unit).
Check the following:
lFPC connector con-
nection
Refer to ``Flexible
Print Circuit (FPC)'',
EL-2059.
lScrews securing the
malfunctioning meter/
gauge
(The screws are
located behind the
combination meter.
For details refer to
EL-2070.)
OK
NGSYMPTOM CHART 2
Refer to EL-2061.
SYMPTOM CHART 1
Refer to EL-2061.Reconnect FPC connector and check continuity between
check land terminals and/or repair malfunctioning part.
Refer to ``Flexible Print Circuit (FPC)'', EL-2059.
.
.
.
...
..
..
METER AND GAUGES
EL-2060

Before starting trouble diagnoses below, perform PRELIMINARY CHECK, EL-2060.
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.
lSpeedometer (Unified meter control unit)lReplace speedometer (unified meter control unit).
Multiple meter/gauge indicate
malfunction in Diagnosis
mode.
One of tachometer/fuel gauge/
water temp. gauge indicates
malfunction in Diagnosis
mode.
lMeter/GaugelSpeedometer (Unified 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-2070.
2. If the resistance is OK, replace speedometer (unified 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 (Unified meter control unit)1. Check vehicle speed sensor.
INSPECTION/VEHICLE SPEED SENSOR (Refer to
EL-2063.)
2. Check FPC connector. Refer to ``FLEXIBLE PRINT CIRCUIT
(FPC)'', EL-2059.
3. Replace speedometer (unified meter control unit).
Multiple meter/gauge are mal-
functioning. (except
speedometer, odo/trip meter)1. FPC connector
2. Speedometer (Unified meter control unit)1. Check FPC connector. Refer to ``FLEXIBLE PRINT CIRCUIT
(FPC)'', EL-2059.
2. Replace speedometer (unified 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 (Unified meter control unit)1. Check the sensor for malfunctioning meter/gauge.
INSPECTION/ENGINE REVOLUTION SIGNAL (Refer to
EL-2063.)
INSPECTION/FUEL TANK GAUGE (Refer to EL-102.)
INSPECTION/THERMAL TRANSMITTER (Refer to
EL-2064.)
2. Check FPC connector. Refer to ``Flexible Print Circuit
(FPC)'', EL-2059.
3. Replace speedometer (unified meter control unit).
METER AND GAUGES
Trouble Diagnoses/Models with Tachometer
(Cont'd)
EL-2061

POWER SUPPLY AND GROUND CIRCUIT CHECK
Power supply circuit check
Terminals Ignition switch position
Å@OFF ACC ON
V2GroundBattery
voltageBattery
voltageBattery
voltage
V37Ground 0V 0VBattery
voltage
If NG, check the following.
l7.5A fuse [No.3, located in fuse block (J/B)]
l10A fuse [No.20 , located in fuse block (J/B)]
lHarness for open or short between fuse and combination
meter
Ground circuit check
Terminals Continuity
V3- Ground Yes
SEL420W
SEL421W
METER AND GAUGES
Trouble Diagnoses/Models with Tachometer
(Cont'd)
EL-2062

INSPECTION/VEHICLE SPEED SENSOR
CHECK VEHICLE SPEED SENSOR
OUTPUT.
1. Remove vehicle speed sensor from
transmission.
2. Check voltage between combination
meter terminals
V7andV15while
quickly turning speed sensor pinion.
Voltage: Approx. 0.5V
NG
cOK
Vehicle speed sensor is
OK.
CHECK VEHICLE SPEED SENSOR.
Check resistance between vehicle speed
sensor terminals
V1andV2.
Resistance: Approx. 250W
OK
cNG
Replace vehicle speed
sensor.
Check harness or connector between
speedometer and vehicle speed sensor.
INSPECTION/ENGINE REVOLUTION SIGNAL (Models
with tachometer)
Engine Check itemTerminals
ExplanationÅ@
ECM con-
trolled engineDC voltage
V16V3
Higher rpm = Higher voltage
Lower rpm = Lower voltage
Voltage should change with
rpm. Carburetor
AC voltage
Diesel TD27
and QD32
If NG, check the following.
Engine Check item
ECM con-
trolled engine
lHarness for open or short and connection
Carburetor
lHarness for open or short and connection
lResistor etc.
Diesel TD27
and QD32
lHarness for open or short and connection
lEngine revolution sensor etc.
SEL422W
SEL118V
SEL423W
.
.
METER AND GAUGES
Trouble Diagnoses/Models with Tachometer
(Cont'd)
EL-2063

INSPECTION/FUEL LEVEL SENSOR
CHECK GROUND CIRCUIT FOR FUEL
LEVEL SENSOR UNIT.
Check harness continuity between fuel
level sensor unit terminal
V1and ground.
Continuity should exist.
OK
cNG
Repair harness or connec-
tor.
CHECK FUEL LEVEL SENSOR UNITS.
Refer to ``FUEL LEVEL SENSOR UNIT
CHECK'' (EL-2070).
OK
cNG
Repair or replace.
Refer to FE section.
CHECK HARNESS.
1. Disconnect combination meter connec-
tor
N4and fuel level sensor unit
connector.
2. Check harness continuity between
combination meter terminal
V6and
fuel level sensor unit terminal
V3.
Continuity should exist.
3. Check continuity between combination
meter terminal
V6and ground.
Continuity should not exist.
OK
cNG
Repair harness or connec-
tor.
Fuel level sensor is OK.
INSPECTION/THERMAL TRANSMITTER
CHECK THERMAL TRANSMITTER.
Refer to ``THERMAL TRANSMITTER
CHECK'' (EL-2071).
OK
cNG
Repair or replace.
CHECK HARNESS.
1. Disconnect combination meter connec-
tor
N4and thermal transmitter con-
nector.
2. Check harness continuity between
combination meter terminal
V5and
thermal transmitter terminal
V1.
Continuity should exist.
3. Check continuity between combination
meter terminal
V5and ground.
Continuity should not exist.
OK
cNG
Repair harness or connec-
tor.
Thermal transmitter is OK.
SEL424W
SEL425W
SEL426W
.
.
.
.
.
METER AND GAUGES
Trouble Diagnoses/Models with Tachometer
(Cont'd)
EL-2064

Trouble Diagnoses/Models without
Tachometer
PRELIMINARY CHECK
CHECK-IN
Can Diagnosis mode
be activated? Refer to
``Meter/Gauge Opera-
tion and Odo/Trip
Meter Segment
Check in Diagnosis
Mode'', EL-2058.
Yes
cNo
Do meter warning
lamps operate?
No
.
Yes
Can Diagnosis mode
be activated?
NomYes
Check power supply
and ground circuit.
Refer to ``POWER
SUPPLY AND
GROUND CIRCUIT
CHECK'', EL-2067.
Check meter/gauge
operation in Diagno-
sis mode.b
Malfunction is indi-
cated in Diagnosis
mode.No malfunction is
indicated in Diagnosis
mode.Replace unified meter control
unit.
Check the following:
lScrews securing the
malfunctioning
meter/gauge
(The screws are
located behind the
combination meter.
For details refer to
EL-2070.)
OK
NGSYMPTOM CHART 2
Refer to EL-2066.
SYMPTOM CHART 1
Refer to EL-2066.Retighten the loose screw.
.
.
.
...
..
..
METER AND GAUGES
EL-2065