power steering MAZDA MIATA 1991 Factory Service Manual

TORQUE SPECIFICATIONS
DIAGNOSIS & TESTING
SELF-DIAGNOSTIC SYSTEM
Trouble Shooting
AIR BAG warning light flashes are used to diagnose air bag system. The number of warning light flashes
depends on the type of fault being detected. Codes are prioritized so that if 2 or more faults are present, the
highest test-priority fault indication will remain until corrected.
Warning Light Does Not Illuminate
Check for blown fuses, burned-out bulb, disconnected diagnostic module, or open circuit between warning light
and diagnostic module.
Warning Light Flashes Or Remains On
Check code output of AIR BAG warning light. See AIR BAG FLASH CODES table.
AIR BAG FLASH CODES
ApplicationFt. Lbs. (N.m)
Air Bag Module Nuts12-15 (16-20)
Steering Wheel Nut29-36 (39-49)
INCH Lbs. (N.m)
Front Impact Sensor Bolts78-113 (9-13)
Rear Safing Sensor Nuts
Miata78-113 (9-13)
RX761-87 (7-10)
WARNING:Follow air bag service precautions to prevent accidentalair bag
deployment and personal injury. See SERVICE PRECAUTIONS.
NOTE: After component replacement, check system to ensure proper operation. See
SYSTEM OPERATION CHECK.
PriorityFlash CodeCause/Diagnosis
1Remains OnFaulty Diagnostic Module
Poor Connection Of Diagnostic
Module Connector (See
DIAGNOSTIC TEST NO. 1)
2Flashes 3 TimesOpen Circuit
Poor Connection Of Power Source

1991 Mazda MX-5 Miata
AIR BAG RESTRAINT SYSTEM MAZDA 1990-91 AIR BAGS
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Fig. 3: Adjusting A/C Compressor & Power Steering Pump Belt
Courtesy of MAZDA MOTORS CORP.

1991 Mazda MX-5 Miata
1990-93 ENGINE COOLING Drive Belt Routing & Adjustment - MX-5 Miata
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Fig. 4: Adjusting A/C Compressor Belt
Courtesy of MAZDA MOTORS CORP.
POWER STEERING PUMP
Loosen power steering pump bolt and nuts and adjust belt deflection by turning adjusting bolt. See Fig. 3
, Fig.
6 and Fig. 7 . See ADJUSTMENT SPECIFICATIONS . Tighten bolts to specification. See TORQUE
SPECIFICATIONS .
DRIVE BELT ROUTING

1991 Mazda MX-5 Miata
1990-93 ENGINE COOLING Drive Belt Routing & Adjustment - MX-5 Miata
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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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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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23 - Empty
24 - 10 Amp (Red) Interior Lights, Warning Buzzers, Radio/Cassette, Compact Disc Player, Clock
25 - 15 Amp (Blue) Radio/Cassette, Compact Disc Player, Clock, Cigarette Lighter
26 - Empty
27 - Empty
BATTERY SPECIFICATIONS
Vehicle is equipped with a special 9 9/16" x 4 3/4" x 7 3/8" 12-volt battery that is vented to outside of vehicle.
CAUTIONS & WARNINGS
SUPPLEMENTAL RESTRAINT SYSTEM (AIR BAG)
Modifications or improper maintenance, including incorrect removal and installation of the Supplemental
Restraint System (SRS), can adversely affect system performance. DO NOT cover, obstruct or change the
steering wheel horn pad in any way, as such action could cause improper function of the system. Use only plain
water when cleaning the horn pad. Solvents or cleaners could adversely affect the air bag cover and cause
improper deployment of the system.
AIR CONDITIONING SERVICING CAUTION: When battery is disconnected, vehicles equipped with computers may
lose memory data. When battery power is restored, driveability problems
may exist on some vehicles. These vehicles may require a relearn
procedure. See COMPUTER RELEARN PROCEDURES article in the
GENERAL INFORMATION Section.
NOTE: See the AIR BAGS article in the ACCESSORIES/SAFETY EQUIPMENT Section.
WARNING:To avoid injury from accidental air bag deployment, read and carefully
follow all warnings and service precautions. See appropriate AIR BAGS
article in ACCESSORIES/SAFETY EQUIPMENT.
CAUTION: Disconnect negative battery cable before servicing any air bag system,
steering column or passenger side dash component. After any repair, turn
ignition key to the ON position from passenger's side of vehicle in case of
accidental air bag inflation
CAUTION: Avoid breathing R-134a refrigerant and PAG lubricant vapors, exposure
may irritate eyes, nose and throat. To remove R-134a from system use R-
134a recycling equipment that meets SAE J2210 specifications. If
accidental system discharge occurs, ventilate work area before resuming

1991 Mazda MX-5 Miata
FUSES & CIRCUIT BREAKERS Fuses & Circuit Breakers 1990-95 Mazda
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STEERING GEAR - POWER RACK & PINION
1991 STEERING Mazda - Power Rack & Pinion
DESCRIPTION
Steering system is a power-assisted rack and pinion. The system consists of a rack and pinion steering gear and
power-assist pump/reservoir. The steering gear and pump/reservoir are connected by flexible hoses.
TESTING
HYDRAULIC SYSTEM PRESSURE TEST
Pump Fluid Pressure Test
1. Disconnect pressure hose and connect pressure gauge/valve between steering pump and steering gear. See
Fig. 1
. Bleed air from system.
2. Open valve fully. Start engine and idle. Turn steering wheel lock-to-lock to increase fluid temperature to
122-140°F (50-60°C). To measure pump fluid pressure, close gauge valve completely.
3. Increase engine speed to 1000-1500 RPM. Ensure pump pressure is within specification. See
HYDRAULIC SYSTEM FLUID PRESSURE SPECIFICATIONS
table. If pressure is not within
specification, replace pump.
CAUTION: DO NOT leave gauge valve closed for more than 15 seconds, or pump may
be damaged.

1991 Mazda MX-5 Miata
STEERING GEAR - POWER RACK & PINION 1991 STEERING Mazda - Power Rack & Pinion

1991 Mazda MX-5 Miata
STEERING GEAR - POWER RACK & PINION 1991 STEERING Mazda - Power Rack & Pinion
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Fig. 1: Connecting Pressure Gauge (Except 4-Wheel Steering)
Courtesy of MAZDA MOTORS CORP.
Gear Fluid Pressure Test
1. Ensure pump pressure is within specification. To measure steering gear fluid pressure, open gauge/valve
completely. Increase engine speed to 1000-1500 RPM.
2. Turn steering wheel from lock-to-lock. Gauge pressure must be within specification. See HYDRAULIC
SYSTEM FLUID PRESSURE SPECIFICATIONStable. If pressure is less than specification, steering
gear is defective.
HYDRAULIC SYSTEM FLUID PRESSURE SPECIFICATIONS
(1)
Applicationpsi (kg/cm2 )
Miata1109-1209 (78-85)
MPV, MX-6, 626 & 9291067-1138 (75-80)
Protege
2WD1067 (75)
4WD1138 (80)
RX71138-1209 (80-85)
3231067 (75)

1991 Mazda MX-5 Miata
STEERING GEAR - POWER RACK & PINION 1991 STEERING Mazda - Power Rack & Pinion
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LUBRICATION
CAPACITY
POWER STEERING FLUID CAPACITY
FLUID TYPE
Dexron-II or M-III are recommended for all vehicles.
FLUID LEVEL CHECK
Check fluid level with engine off. Remove fluid level gauge on oil pump or reservoir. Check fluid level. Fluid
should be between "L" and "H" marks on level gauge dipstick. If fluid level is low, fill through gauge tube.
Recheck fluid level. DO NOT overfill.
HYDRAULIC FLUID BLEEDING
1. Raise and support front of vehicle. With ignition off, turn steering wheel lock-to-lock several times. Add
fluid as necessary. Repeat procedure until fluid level no longer decreases.
2. Start engine and let idle. Turn steering wheel lock-to-lock 5 times. Check fluid level. Add fluid as
necessary. Continue procedure until fluid is clear of air bubbles and does not decrease in level.
ADJUSTMENTS
POWER STEERING BELT ADJUSTMENT
POWER STEERING BELT DEFLECTION
(1)
(1)Specifications are measured at 1000-1500 RPM, with fluid temperature at 122-140°F (50-60°C).
ApplicationQts. (L)
Miata, MPV & 929.95 (.90)
MX-6 & 626
Electronc Controlled Power Steering (ECPS)1.06 (1.0)
Engine Speed (Sensing) Power Steering (ESPS).95 (.90)
Protege & 323.63 (.60)
RX7.85 (.80)
NOTE: On-vehicle adjustment procedures are not available from manufacturer.
ApplicationIn. (mm)
Miata, Protege & 323
New Belt.31-.35 (7.8-8.9)

1991 Mazda MX-5 Miata
STEERING GEAR - POWER RACK & PINION 1991 STEERING Mazda - Power Rack & Pinion
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