Instrument Panel - Standard; Description And Operation; Gauges - Mazda 1983 RX7 Service Manual

ARTICLE BEGINNING
Switches & Instrument Panels
MAZDA
DESCRIPTION & OPERATION
All models have a steering column mounted combination switch
to control turn signals, headlights and wipers. The instrument
cluster contains a speedometer, fuel gauge and water temperature
gauge.
Some models also have a tachometer, voltmeter and oil
pressure gauge. The fuel and temperature gauges operate on 7 volts,
supplied by a cluster-mounted voltage regulator. The sending units
are variable-resistance type and have the same resistance values on
all models.
TESTING

GAUGES

1) Turn ignition on. If gauge needles do not move at all,
check for blown fuse or broken power wire. If both gauges are
inoperative, voltage regulator may be the cause. If only one gauge
does not work, the gauge, sending unit, or connecting wiring may be
at fault.
2) To test temperature gauge, disconnect sending unit wire.
Connect a resistor between wire and ground, then check gauge reading.
Change resistance and recheck. If gauge readings are as shown in
tables, replace sending unit. If not, repair wiring or replace gauge.
3) To test fuel gauge, disconnect wire to sending unit at
fuel tank (all except GLC Wagon) or unplug connector behind left kick
panel (GLC Wagon). Connect resistor between Yellow wire and ground.
Check gauge reading.
NOTE: Allow 2 minutes for gauge reading to stabilize. It should be
within 1 pointer width of line on gauge face. See Fig. 1.
4) If gauge readings are incorrect, replace gauge. If
readings are okay, test in-tank sending unit before replacing it.
Resistance should measure 0-5 ohms with float raised, and 103-117
ohms with float lowered. If not, replace sending unit.
RESISTANCES FOR FUEL GAUGE TESTING
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Needle Position
Full Line ...............................................
Half Tank ..................................................
Empty Line .............................................

INSTRUMENT PANEL - STANDARD

Article Text
1983 Mazda RX7
For www.iluvmyrx7.com
Copyright © 1998 Mitchell Repair Information Company, LLC
Sunday, August 26, 2001 03:29PM
Test Resistor
(1) 7 ohms
33 ohms
(2) 95 ohms