Nissan Silvia. Manual — part 194
Trouble Diagnoses
NMEL0046
PRELIMINARY CHECK
NMEL0046S04
SEL361W
*1: Meter/Gauge Operation and Odo/
Trip Meter Segment Check in
Diagnosis Mode (EL-64)
*2: METER/GAUGE RESISTANCE
CHECK (EL-71)
*3: POWER SUPPLY AND GROUND
CIRCUIT CHECK (EL-67)
*4: Symptom Chart 1 (EL-66)
*5: Symptom Chart 2 (EL-66)
GI
MA
EM
LC
EC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
METERS AND GAUGES
Trouble Diagnoses
EL-65
SYMPTOM CHART
NMEL0046S10
Symptom Chart 1 (Malfunction is Indicated in
Diagnosis Mode)
NMEL0046S1001
Symptom
Possible causes
Repair order
Odo/trip meter indicate(s)
malfunction in Diagnosis
mode.
Unified meter control unit
Replace unified meter control unit.
Multiple meter/gauge indi-
cate malfunction in Diagno-
sis mode.
One of speedometer/
tachometer/fuel gauge/
water temp. gauge indicates
malfunction in Diagnosis
mode.
1. Meter/Gauge
2. Unified meter control unit
1. Check resistance of meter/gauge indicating malfunc-
tion. If the resistance is NG, replace the meter/
gauge. Refer to “METER/GAUGE RESISTANCE
CHECK”, EL-71.
2. If the resistance of meter/gauge is OK, replace uni-
fied meter control unit.
Symptom Chart 2 (No Malfunction is Indicated in
Diagnosis Mode)
NMEL0046S1002
Symptom
Possible causes
Repair order
One of speedometer/
tachometer/fuel gauge/
water temp. gauge is mal-
functioning.
1. Sensor signal
- Vehicle speed signal
- Engine revolution signal
- Fuel gauge
- Water temp. gauge
2. Unified meter control unit
1. Check the sensor for malfunctioning meter/gauge.
INSPECTION/VEHICLE SPEED SIGNAL (Refer to
EL-68.)
INSPECTION/ENGINE REVOLUTION SIGNAL
(Refer to EL-68.)
INSPECTION/FUEL LEVEL SENSOR UNIT (Refer to
EL-69.)
INSPECTION/THERMAL TRANSMITTER (Refer to
EL-70.)
2. Replace unified meter control unit.
Multiple meter/gauge are
malfunctioning. (except
odo/trip meter)
Before starting trouble diagnoses below, perform PRELIMINARY
CHECK, EL-65.
METERS AND GAUGES
Trouble Diagnoses (Cont’d)
EL-66
SEL224Y
POWER SUPPLY AND GROUND CIRCUIT CHECK
=NMEL0046S07
Power Supply Circuit Check
NMEL0046S0701
Terminals
Ignition switch position
(+)
(−)
OFF
ACC
ON
Connector
Terminal
(Wire color)
M18
13 (R/W)
Ground
Battery
voltage
Battery
voltage
Battery
voltage
12 (G/Y)
Ground
0V
0V
Battery
voltage
If NG, check the following.
I
10A fuse [No. 28, located in fuse block (J/B)]
I
10A fuse [No. 11, located in fuse block (J/B)]
I
Harness for open or short between fuse and combination
meter
SEL225Y
Ground Circuit Check
NMEL0046S0702
Terminals
Continuity
(+)
(−)
Connector
Terminal (Wire
color)
M18
9 (B)
Ground
Yes
GI
MA
EM
LC
EC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
METERS AND GAUGES
Trouble Diagnoses (Cont’d)
EL-67
INSPECTION/VEHICLE SPEED SIGNAL
=NMEL0046S03
1
CHECK ABS CONTROL UNIT OUTPUT
1. Lift up drive wheel.
2. Turn ignition switch “ON”.
3. Check voltage between combination meter harness connector M18 terminal 14 (LG) and ground when rotating wheel
by hand.
SEL226Y
OK or NG
OK
©
ABS control unit output signal is OK.
NG
©
Check the following.
I
Harness for open or short between ABS control unit and combination meter.
I
ABS control unit. Refer to BR-72, “Control Unit”.
INSPECTION/ENGINE REVOLUTION SIGNAL
NMEL0046S02
1
CHECK ECM OUTPUT
1. Start engine.
2. Check voltage between combination meter harness connector M18 terminals 15 (L/OR) and ground at idle and 2,000
rpm.
SEL227Y
OK or NG
OK
©
Engine revolution signal is OK.
NG
©
Harness for open or short between ECM and combination meter
METERS AND GAUGES
Trouble Diagnoses (Cont’d)
EL-68
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