MAZDA MIATA 1991 Factory Service Manual

Fig. 7: Identifying Drive Belt Routing & Deflection Check Point (3 Of 3)
Courtesy of MAZDA MOTORS CORP.
ADJUSTMENT SPECIFICATIONS
DEFLECTION SPECIFICATIONS
NOTE: Check belt deflection when engine is cold, or has bin off for 30 minutes.
Application(1) Specification - In. (mm)
New Belt (2)
Alternator0.31-0.35 (8-9)
A/C Compressor0.31-0.35 (8-9)
Power Steering Pump0.31-0.35 (8-9)
Used Belt
Alternator0.35-0.39 (9-10)
A/C Compressor0.35-0.39 (9-10)
Power Steering Pump0.35-0.39 (9-10)
(1)Deflection with 22 lbs. (10 kg) pressure applied midway on belt run.
Used on for less than 5 minutes.

1991 Mazda MX-5 Miata
1990-93 ENGINE COOLING Drive Belt Routing & Adjustment - MX-5 Miata
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TENSION SPECIFICATIONS
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS
(2)
Application(1) Specification - Lbs. (kg)
New Belt (2)
Alternator110-132 (50-60)
A/C Compressor110-132 (50-60)
Power Steering Pump110-132 (50-60)
Used Belt
Alternator95-110 (43-50)
A/C Compressor95-110 (43-50)
Power Steering Pump95-110 (43-50)
(1)Measure tension using Tension Gauge (49 9200 020), or equivalent.
(2)Used on for less than 5 minutes.
ApplicationFt. Lbs. (N.m)
Alternator Adjusting Bolt
"A"14-18 (19-25)
"B"27-38 (37-52)
A/C Compressor Locknut27-38 (37-52)
Power Steering Pump Adjusting Bolt
"A"23-44 (31-46)
"B"27-40 (37-54)
"C"14-18 (19-25)

1991 Mazda MX-5 Miata
1990-93 ENGINE COOLING Drive Belt Routing & Adjustment - MX-5 Miata
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ELECTRICAL COMPONENT LOCATOR
1991 MAZDA ELECTRICAL COMPONENTS
BUZZERS, RELAYS & TIMERS
BUZZERS, RELAYS & TIMERS LOCATION
CIRCUIT PROTECTION DEVICES
CIRCUIT PROTECTION DEVICES LOCATION
CONTROL UNITS
ComponentLocation
ABS System
Check Valve RelayOn top of ABS pump motor.
Motor RelayOn top of ABS pump motor.
Buzzer & Timer UnitOn bracket, behind left side of dash.
See Fig. 1
.
Circuit Opening RelayOn bracket, behind left side of dash.
See Fig. 1
.
Cooling Fan RelayIn engine compartment fuse/relay
block. See Fig. 1
.
Dashboard Illumination Lights RelayOn bracket, near master cylinder. See
Fig. 1
.
EFI Main RelayIn engine compartment fuse/relay
block. See Fig. 1
& Fig. 2 .
Fuel Pump RelayBehind left front kick panel.
Headlight RelayOn bracket, near master cylinder. See
Fig. 1
.
Headlight Retractor RelayOn bracket, near master cylinder. See
Fig. 1
.
Horn RelayOn bracket, behind left side of dash.
See Fig. 1
.
Ignition RelayIn engine compartment fuse/relay
block.
Turn Signal/Hazard Flasher RelayOn bracket, behind left side of dash.
See Fig. 1
.
ComponentLocation
Fuse BlockBehind left side of dash.
Fuse/Relay BlockIn right rear corner of engine compartment, near firewall.
See Fig. 2
.
Heater Blower Motor Circuit BreakerIn passenger compartment fuse block.

1991 Mazda MX-5 Miata
ELECTRICAL COMPONENT LOCATOR 1991 MAZDA ELECTRICAL COMPONENTS

1991 Mazda MX-5 Miata
ELECTRICAL COMPONENT LOCATOR 1991 MAZDA ELECTRICAL COMPONENTS
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CONTROL UNITS LOCATION
SENDING UNITS & SENSORS
SENDING UNITS & SENSORS LOCATION
MOTORS
MOTORS LOCATION
SOLENOIDS & SOLENOID VALVES
SOLENOIDS & SOLENOID VALVES LOCATION
ComponentLocation
ABS Control UnitBehind center of dash, near ECU.
Cruise Control UnitBehind left side of dash, above fuse block.
Engine Control Unit (ECU)Behind center of dash. See Fig. 2 .
Supplemental Safety Restraint (SRS)
ModuleBehind left side of dash. See Fig. 3 .
ComponentLocation
ABS Wheel SensorsOn each front & rear wheel hub
assembly.
Airflow MeterConnected to air filter housing. See Fig.
2 .
Atmospheric Pressure SensorBuilt-in ECU.
Brake Fluid Level SensorInside brake master cylinder.
Coolant Temperature SensorOn water outlet, at left rear of engine. See
Fig. 2
.
Cooling Fan ThermoswitchOn thermostat housing.
Crank Angle SensorOn right rear side of cylinder head. See
Fig. 2
.
Intake Air ThermosensorIn airflow sensor unit.
Oil Pressure SensorOn left side of engine near oil filter.
SRS Crash/Impact Sensors
FrontOn center, left and right front of
vehicle. See Fig. 3
.
CenterBehind center of dash. See Fig. 3 .
Throttle Position Sensor (TPS)Mounted on side of throttle body. See
Fig. 2
.
ComponentLocation
A/C-Heater Blower MotorBehind left side of dash.
Wiper MotorOn right side of firewall.

1991 Mazda MX-5 Miata
ELECTRICAL COMPONENT LOCATOR 1991 MAZDA ELECTRICAL COMPONENTS
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SWITCHES
SWITCHES LOCATION
MISCELLANEOUS
MISCELLANEOUS LOCATION
COMPONENT LOCATION GRAPHICS
ComponentLocation
Idle Speed Control SolenoidOn throttle body.
Purge Control Solenoid ValveOn right side of engine compartment, on shock
tower.
ComponentLocation
A/C Pressure SwitchOn high pressure refrigerant line.
Back-Up Light SwitchOn left side of transmission.
Clutch SwitchOn bracket, above clutch pedal. See Fig. 2 .
Neutral SwitchOn right rear side of transmission. See Fig. 2 .
Parking Brake SwitchOn base of parking brake lever.
Power Steering Pressure SwitchOn power steering housing assembly. See Fig. 2 .
Seat Belt Buckle SwitchOn driver's side seat belt buckle.
Stoplight SwitchOn bracket, above brake pedal. See Fig. 2 .
ComponentLocation
Diagnostic Check ConnectorOn left rear of engine compartment, near master cylinder. See Fig. 2 .
IgniterOn right rear corner of engine compartment, near fuse/relay block. See
Fig. 2
.
SRS Back-Up BatteryMounted below SRS control unit. See Fig. 3 .
NOTE: Figures may show multiple component locations. Refer to appropriate table for
proper figure references.

1991 Mazda MX-5 Miata
ELECTRICAL COMPONENT LOCATOR 1991 MAZDA ELECTRICAL COMPONENTS
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Fig. 1: Component Locations (1 Of 3)

1991 Mazda MX-5 Miata
ELECTRICAL COMPONENT LOCATOR 1991 MAZDA ELECTRICAL COMPONENTS
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Fig. 2: Component Locations (2 Of 3)

1991 Mazda MX-5 Miata
ELECTRICAL COMPONENT LOCATOR 1991 MAZDA ELECTRICAL COMPONENTS
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Fig. 3: Component Locations (3 Of 3)

1991 Mazda MX-5 Miata
ELECTRICAL COMPONENT LOCATOR 1991 MAZDA ELECTRICAL COMPONENTS
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SUSPENSION - FRONT
1990-91 SUSPENSION Front
DESCRIPTION
An independent front suspension with MacPherson struts is used on all models except Miata. Miata uses a
double wishbone design with coil over shock absorbers. See Fig. 1
. Strut assemblies mount between steering
knuckle and upper fender panels. Strut assemblies consist of inner shock absorbers and coil springs surrounding
outside of strut tube housing.
The steering knuckle is connected to lower control arm and strut. Lower control arm pivots at crossmember and
is connected by ball joint to steering knuckle. All models are equipped with a stabilizer bar which attaches to
each lower control arm and frame. See Fig. 1
- Fig. 5 . Some models may also be equipped with Auto Adjust
Suspension (AAS). For more information on this system, see ELECTRONIC SUSPENSION article in the
SUSPENSION section.
ADJUSTMENTS & INSPECTION
WHEEL ALIGNMENT SPECIFICATIONS & PROCEDURES
See WHEEL ALIGNMENT SPECIFICATIONS AND PROCEDURES article in the WHEEL ALIGNMENT
section.
WHEEL BEARING
Miata, Protege & 323
Raise and support vehicle. Remove wheel assembly. Remove and wire aside brake caliper. Remove rotor.
Install a dial indicator against wheel hub and measure axial movement. Axial movement should be .002" (.05
mm) maximum. If specification is exceeded, check and adjust lock nut torque or replace bearing on Protege and
323 or hub and bearing assembly on Miata.
MPV & 929
Raise and support vehicle. Remove wheel assembly. Remove and wire aside brake caliper. Install a dial
indicator against wheel hub and measure axial movement. Maximum axial movement should be .002" (.05
mm). If specification is exceeded, check and adjust lock nut torque or replace bearing on MPV 4WD and 929 or
hub and bearing assembly on MPV 2WD.
RX7
1. Raise and support vehicle. Remove wheel assembly. Remove and wire aside brake caliper. Install a dial
indicator against hub and measure axial movement. Axial movement should be zero. If specification is
exceeded, adjust preload or replace wheel bearing.
2. To ad
just preload, remove grease cap, cotter pin and set cover. Loosen lock nut. Tighten to 14-22 ft. lbs.

1991 Mazda MX-5 Miata
SUSPENSION - FRONT 1990-91 SUSPENSION Front

1991 Mazda MX-5 Miata
SUSPENSION - FRONT 1990-91 SUSPENSION Front
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(20-29 N.m). Turn wheel hub a few times to seat bearings. Loosen lock nut slightly until it can be turned
by hand.
3. Attach spring scale to hub bolt, and measure preload. Note value. Tighten lock nut until preload is .09-2.2
lbs. (.4-1.0 kg) more than amount measured in step 2).
MX-6 & 626
Raise and support vehicle. Remove wheel assembly. Remove and wire aside brake caliper. Install a dial
indicator against wheel hub and measure axial movement. Axial movement should not exceed .008" (.2 mm). If
specification is exceeded, replace wheel bearing.
BALL JOINT CHECKING
Remove lower control arm. Rotate ball joint stud 3-4 times. Install Preload Attachment (49 0180 510B) to ball
joint stud. Measure ball joint preload using spring scale. Preload for all models except Miata, MPV 2WD and
929 is 4.4-7.7 lbs. (2.0-3.5 kg). Preload for Miata is 1.1-3.3 lbs. (.5-1.5 kg). Preload for MPV 2WD is 39.6 lbs.
(18. kg) or less. Preload for 929 is 1.1-2.6 lbs. (.5-1.2 kg).
Fig. 1: Exploded View of Front Suspension (Miata)

Courtesy of MAZDA MOTORS CORP.

1991 Mazda MX-5 Miata
SUSPENSION - FRONT 1990-91 SUSPENSION Front
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