Honda Accord Electrical Troubleshooting Manual — part 46
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80-5
Gauges and Indicators (L4)
Tachometer
Speedometer
Tachometer
Drive Circuit
Speedometer
Drive Circuit
F
From F
on page
80-3.
E
From E
on page
80-2.
Odo/Trip Display
Trip/
Maintenance
Reset Switch
MAINT
REQ’D
Maintenance
Required
Indicator
7.5A
Passenger’s
Under-dash
Fuse/Relay
Box
HOT AT ALL TIMES
See page 10-12.
WHT/YEL
B21
Gauge
Assembly
WHT/YEL
See page 10-12.
A3
D
From D on
page 80.
Engine Coolant
Temperature
Gauge
Engine Coolant
Temperature
Gauge Drive Circuit
Odometer/Trip/Maintenance/Washer Circuit
BLU/WHT
2
C302
BLK
See page
14-7.
G301
B2
B16
B12
PNK
PNK
2
Washer
Fluid
Level
Sensor
1
Canada
G501
BLK
See page
14-10.
BLK
G101
1
15A
Driver’s
Under-dash
Fuse/Relay
Box
HOT IN ON OR START
See page 10-6.
BLK/YEL
2
3
See Circuit E93,
page 15-11 (M/T).
BLU/WHT
See Circuit E93,
page 15-11 (A/T).
BLU/WHT
PCM
VSS
M/T
A/T
(VSSOUT)
Vehicle
speed
output
BLK
BLK
BLU/WHT
BLU/WHT
BLK/YEL
See page
10-6.
BLU
BLU
PCM
or ECM
B1
RPM
output
(NEP)
19
C204
2
BLU
Test
Tachometer
Connector
’00-’02 Models
C2
PCM or
ECM
(Not used)
Washer
Level
Indicator
BLU
YEL/GRN
(MTRTW)
Engine
coolant
temperature
signal
16
C204
2
C101
YEL/GRN
YEL/GRN
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80-6
Gauges and Indicators (L4)
How the Circuit Works
The indicator lights are controlled by different
conditions in their associated systems. Refer to
each associated system to see its entire schematic.
Engine Coolant Temperature Gauge (’98-’99)
The engine coolant temperature gauge has two
intersecting coils wound around a permanent magnet
rotor. Voltage applied to the coils, through fuse 9 (in
driver’s under-dash fuse/relay box), generates a
magnetic field. The magnetic field, controlled by the
coolant temperature sending unit, causes the rotor to
rotate and the gauge needle to move. As the
resistance in the sending unit varies, current through
the gauge coils changes, moving the gauge needle
toward the coil with the strongest magnetic field.
The coolant temperature sending unit’s resistance
varies from about 137 ohms at low engine coolant
temperature to between 30-46 ohms at high
temperature (radiator fan running).
Refer to the Service Manual (Section 10,
Cooling System) for specific tests or
troubleshooting procedures.
Engine Coolant Temperature Gauge (’00-’02)
The engine coolant temperature gauge has two
intersecting coils wound around a permanent
magnet rotor. Voltage applied to the coils, through
fuse 9 (in driver’s under-dash fuse/relay box),
generates a magnetic field. The magnetic field,
controlled by the ECM or PCM causes the rotor to
rotate and the gauge needle to move. As the ECM
or PCM varies the current, current through the
gauge coils changes, moving the gauge needle
toward the coil with the strongest magnetic field.
Refer to the Service Manual (Section 10,
Cooling System) for specific tests or
troubleshooting procedures.
Fuel Gauge
The fuel gauge has two intersecting coils wound
around a permanent magnet rotor. Voltage applied
to the coils, through fuse 9 (in driver’s under-dash
fuse/relay box), generates a magnetic field. The
magnetic field, controlled by the fuel gauge
sending unit, causes the rotor to rotate and the
gauge needle to move. As the resistance in the
sending unit varies, current through the gauge
coils changes, moving the gauge needle toward
the coil with the strongest magnetic field.
The fuel gauge sending unit’s resistance varies
from about 3-5 ohms at full to about 106 ohms at
empty. When you turn the ignition switch to
LOCK (0), the gauge remains at the last reading
until you turn the ignition switch to ON (II) or
START (III) again.
Refer to the Service Manual (Section 11,
Fuel Supply System) for specific tests or
troubleshooting procedures.
Low Fuel Indicator Light
WARNING
Do not smoke while working on the fuel system.
Keep open flame away from the work area.
Drain fuel only into an approved container.
A thermistor is mounted in the fuel tank unit. When
the thermistor is cool, its resistance is very high.
When the thermistor’s temperature increases, its
resistance decreases. Fuel in the fuel tank
transfers heat away from the thermistor fast
enough to keep it cool so the thermistor’s
resistance stays high and the low fuel indicator
light does not come on. When the fuel level drops
below the thermistor, the thermistor’s temperature
increases. With less and less fuel to cool it, the
thermistor’s resistance decreases, eventually
allowing current to flow through the low fuel
indicator light and the thermistor to ground, which
turns on the low fuel indicator light.
Refer to the Service Manual (Section 11,
Fuel Supply System) for specific tests and
troubleshooting procedures.
Speedometer and Odometer
The odometer and speedometer drive circuits
receive pulses from the vehicle speed sensor
(M/T) or PCM (A/T). The pulse rate increases as
the car accelerates. The frequency and duration of
these input pulses are measured and displayed by
the speedometer, odometer, and tripmeter.
Tachometer
The tachometer drive circuit receives pulses from
the PCM or ECM. The solid-state tachometer then
displays these pulses as engine speed. For each
200 pulses per minute from the PCM or ECM the
tachometer displays 100 RPM.
s
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80-7
Gauges and Indicators (L4)
Vehicle Speed Sensor (M/T only)
With the ignition switch in ON (II) or START (III),
battery voltage is supplied through fuse 6 (in
driver’s under-dash fuse/relay box) and the
BLK/YEL wire to the vehicle speed sensor. The
sensor is grounded at G101. The speedometer
and other control units in the circuit supply 5 volts
or more to the BLU/WHT wire. The vehicle speed
sensor intermittently grounds the BLU/WHT wire
which generates a pulsed signal in it. The number
of pulses per minute increases/decreases with the
speed of the car.
Refer to the Service Manual (Section 22,
Body Electrical) for specific tests and
troubleshooting procedures.
t
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80-8
Gauges and Indicators (V6)
See Headlights
(Canada)
(USA w/auto off)
(USA w/o auto off)
1
0
1
0
Canada
BLK/YEL
15A
B9
WHT/BLU
B8
GRN/RED
C14
See Circuit 207,
page 15-7
(USA) or
(Canada).
PNK
B19
Driver’s
Under-dash
Fuse/Relay
Box
HOT IN ON OR START
3
Alternator
PCM
Gauge
Assembly
6
GRN/WHT
GRN/RED
13
DRL
Control
Unit
Parking Brake Switch
1 = Park brake applied
See Circuit 207,
page 15-7
(USA) or (Canada).
B
A
Brake Fluid
Level Switch
1 = Low fluid level
GRN/RED
BLK
G302
(IMOLMP)
Immobilizer
enable
signal
BLK/YEL
See page
10-7.
WHT/BLU
GRN/RED
GRN/RED
BLK
BLK
GRN/RED
(Canada GRN/WHT)
DRL
Indicator
A5
4
C401
BLU/
WHT
BLU/
WHT
9
DRL
Control
Unit
A4
YEL
DRL
H
From
page 80-9.
Canada
WHT/YEL
7.5A
B20
Passenger’s
Under-dash
Fuse/Relay
Box
HOT AT ALL TIMES
WHT/YEL
See page
10-12.
G
WHT/YEL
To page
80-9.
Immobilizer
System
Indicator
High
Beam
Indicator
A12
ORN/WHT
A13
(Canada
)
RED/WHT)
RED/YEL)
–
+
Filter Circuit
Charging
System
Indicator
Safety
indicator Circuit
Brake
System
Indicator
!
(USA)
(Canada)
I
See Headlights
(Canada)
(USA w/auto off)
(USA w/o auto off)
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