1991 MAZDA MIATA clock

Fig. 12: Checking Impact Sensor Resistance
Courtesy of MAZDA MOTORS CORP.
DIAGNOSTIC TEST NO. 4
Warning Light Flashes 10 Times
1. Disable air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM. Disconnect front
impact sensor connectors (center, left, and right), and measure resistance of each sensor. See Fig. 12
.
Resistance should be approximately 1.2 k/ohms. If resistance is not as specified, replace sensor and go to
step 5).
2. If resistance is about 1.2 k/ohms, reconnect all front impact sensor connectors. Disconnect diagnostic
module Black and Gray connectors. See Fig. 10
or Fig. 11 . Measure resistance between diagnostic
module Gray connector Brown/Green wire and ground. If resistance is 1.2 k/ohms, go to next step. If
resistance is not 1.2 k/ohms, replace wire harness.
3. Measure resistance between diagnostic module Gray connector Brown/Red wire and ground. If resistance
is 1.2 k/ohms, go to next step. If resistance is not 1.2 k/ohms, replace wire harness.
4. Measure resistance between diagnostic module Black connector Brown/Black wire and ground. If
resistance is 1.2 k/ohms, go to next step. If resistance is not 1.2 k/ohms, replace wire harness and go to
next step.
5. If disconnected, reconnect dia
gnostic module and clockspring connectors. Reconnect negative battery

1991 Mazda MX-5 Miata
AIR BAG RESTRAINT SYSTEM MAZDA 1990-91 AIR BAGS
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Fig. 13: Identifying Rear Safing Sensor Terminals
Courtesy of MAZDA MOTORS CORP.
DIAGNOSTIC TEST NO. 6
Warning Light Flashes 6 Times
1. Disconnect negative battery cable. Check connection of Orange/Blue clockspring connector; repair as
necessary.
2. If connection is okay, disconnect air bag module and clockspring connector. Check continuity, as shown
in illustration, for both terminals of Blue side of clockspring connector. See Fig. 14
. If continuity is not
present, replace Oran
ge/Blue clockspring connector.

1991 Mazda MX-5 Miata
AIR BAG RESTRAINT SYSTEM MAZDA 1990-91 AIR BAGS
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Fig. 14: Checking Resistance at Clockspring Terminal
Courtesy of MAZDA MOTORS CORP.
3. If continuity is present, disconnect diagnostic module Black and Gray connectors. See Fig. 10
or Fig. 11.
Check continuity between diagnostic module Black connector Green/White wire and clockspring
connector Red wire. Also check continuity between diagnostic module Black connector Green/Yellow
wire and clockspring connector Green/Yellow wire. If continuity is not present, replace wire harness
assembly.
4. If continuity is present, check continuity between diagnostic module Black connector Green/Yellow wire
and ground. If continuity is present, replace wire harness assembly. If continuity is not present, replace air
bag module.
DIAGNOSTIC TEST NO. 7
Warning Light Flashes 2 Or 8 Times
1. Disable air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM. Disconnect diagnostic
module Black and Gray connectors. See Fig. 10
or Fig. 11 . Check continuity between Black connector
Brown/Yellow wire and ground. If continuity is not present, go to step 4). If continuity is present, go to
next step.

1991 Mazda MX-5 Miata
AIR BAG RESTRAINT SYSTEM MAZDA 1990-91 AIR BAGS
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1. Start engine, and observe ANTI-LOCK light. Light should illuminate for a few seconds. If light does not
illuminate as described, remove clock and bezel assembly from dashboard. Slide warning and clock unit
from instrument panel. Connect terminal "E" to ground. See Fig. 9
. ANTI-LOCK light should illuminate.
If light does not illuminate, check bulb. If bulb is okay, check meter fuse and wiring harness.
2. Install instrument cluster, and recheck warning light operation. If light still does not illuminate for a few
seconds, check wiring harness between ANTI-LOCK light and control unit, and ANTI-LOCK light and
hydraulic unit. Check operation of hydraulic unit valve relay.
Operational Test (929)
1. Start engine, and observe ANTI-LOCK light. Light should illuminate for a few seconds. If light does not
illuminate as described, remove instrument cluster. Connect 12 volts to terminal "J" of instrument cluster
connector I-06. See Fig. 10
. Using a jumper wire, connect terminal "E" of instrument cluster connector I-
08 to negative ground. ANTI-LOCK light should illuminate. If light does not illuminate, check bulb. If
bulb is okay, check meter fuse and wiring harness.
2. Install instrument cluster, and recheck warning light operation. If light still does not illuminate for a few
seconds, check wiring harness between ANTI-LOCK light and control unit and between ANTI-LOCK
light and hydraulic unit. Check operation of hydraulic unit valve relay.
Fig. 8: Testing ANTI
-LOCK Warning Light (Miata)
Courtesy of MAZDA MOTORS CORP.

1991 Mazda MX-5 Miata
ANTI-LOCK BRAKE SYSTEM 1988-91 BRAKES Mazda Anti-Lock Brake System
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install remaining components, reverse removal procedure. See Fig. 14. After assembly is complete, wheel to
spindle end play should be .001-.003" (.02-.08 mm).
Removal & Installation (929)
1. Raise and support front of vehicle. Remove wheel. Remove caliper with brake hose connected. Support
caliper with rope. Remove hub cap, wheel bearing lock nut and washer. Remove hub and rotor assembly.
2. Machine rotor if lateral runout exceeds specification. Replace rotor if measured thickness is less than
specified minimum thickness. See DISC BRAKE SPECIFICATIONS
at end of article.
3. To install, reverse removal procedure. Replace wheel bearing lock nut, and tighten to 72-130 ft. lbs. (98-
177 N.m). Check hub end play. If end play exceeds .002" (.05 mm), replace bearing. If end play is within
specification, stake lock nut at groove in axle shaft.
REAR DISC BRAKE PADS
Removal & Installation (Miata, Protege & 323)
1. Raise and support rear of vehicle. Remove wheel. Remove manual adjustment gear concealment plug
from caliper. See Fig. 15
. Insert an appropriate size Allen wrench through hole and turn manual
ad
justment gear counterclockwise to retract caliper piston.

1991 Mazda MX-5 Miata
BRAKE SYSTEM 1991 BRAKES Mazda Brake System
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Fig. 15: Rear Disc Brake Assembly (Miata, Protege & 323)
2. Remove lower guide bolt from caliper. Rotate caliper upward, and support using rope. Remove "M"
spring. Remove pads, shims and guide plates. Replace pad if lining thickness is less than .04" (1.0 mm).
To install, reverse removal procedure.
Removal & Installation (MX-6 & 626)
1. Raise and support rear of vehicle. Remove wheel. Release parking brake and disconnect parking brake
cable from caliper. Remove upper guide bolt from caliper. Rotate caliper downward and secure with rope.
Remove "V" springs. Remove pads and shims.
2. To install, turn caliper piston clockwise using Disc Brake Piston Wrench (49-FA18-602) to retract caliper
piston. Ensure groove in piston aligns with alignment pin on back of inner pad. Replace pad if lining
thickness is less than .04" (1.0 mm). To complete installation, reverse removal procedure.
Removal & Installation (RX7)
1. Raise and support rear of vehicle. Remove wheel. Remove lower guide bolt from caliper. Rotate caliper
upward, and secure using rope. Remove "V" springs. Remove pads and shims. Replace pad if lining
thickness is less than .04" (1.0 mm).

1991 Mazda MX-5 Miata
BRAKE SYSTEM 1991 BRAKES Mazda Brake System
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2. To install, turn caliper piston clockwise using Disc Brake Piston Wrench (49-FA18-602) to retract caliper
piston. Ensure groove in piston aligns with alignment pin on back of inner pad. To install remaining
components, reverse removal procedure.
Removal & Installation (929)
Raise and support rear of vehicle. Remove wheel. Remove lower guide bolt from caliper. Rotate caliper upward
and secure with rope. Remove pads and shims. Replace pad if lining thickness is less than .08" (2.0 mm). To
install, reverse removal procedure.
REAR BRAKE CALIPER
Removal & Installation
1. Raise and support rear of vehicle. On all models except 929, release parking brake and disconnect parking
brake cable from caliper. On all models, disconnect brake hose from caliper.
2. On Miata, Protege and 323, remove manual adjustment gear concealment plug from caliper. See Fig. 15
.
Insert an appropriate size Allen wrench through hole and turn manual adjustment gear counterclockwise
to retract caliper piston.
3. On all models, remove lower guide bolt from caliper. Rotate caliper upward. Pull caliper toward center of
vehicle to slide it off of caliper mount. To install, reverse removal procedure. Bleed hydraulic system.
REAR BRAKE ROTOR
Removal & Installation (Miata, Protege, RX7, 323 & 929)
Remove rear brake caliper. Remove rotor-to-hub screws. Remove rotor. Machine rotor if lateral runout exceeds
specification. Replace rotor if measured thickness is less than specified minimum thickness. See DISC BRAKE
SPECIFICATIONS at end of article. To install, reverse removal procedure.
Removal & Installation (MX-6 & 626)
1. Remove rear caliper, and wire aside. Remove grease cap. Remove lock nut. Remove rotor. Machine rotor
if lateral runout exceeds specification. Replace rotor if measured thickness is less than specified minimum
thickness. See DISC BRAKE SPECIFICATIONS
at end of article.
2. To install, reverse removal procedure. Tighten lock nut to 73-131 ft. lbs. (99-178 N.m). Check end play at
grease cap. If end play exceeds .008" (.20 mm), replace wheel bearings.
REAR BRAKE SHOES
Removal (B2200, B2600i & MPV)
With brake drum removed, remove brake shoe return springs, retaining springs and guide pins. See Fig. 16 or
Fig. 17
. Remove brake shoes. Remove parking brake strut, and disconnect parking brake cable from operating
lever of secondar
y shoe. Minimum lining thickness is .04" (1 mm).

1991 Mazda MX-5 Miata
BRAKE SYSTEM 1991 BRAKES Mazda Brake System
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1 - 30 Amp (Pink) Headlights
2 - 30 Amp (Pink) Fuel Injection, Alternator
3 - 80 Amp (Black) Protection Of All Circuits
4 - 40 Amp (Green) Taillights, Shift Lock, Cruise Control, Horn, Stoplights, Hazard Warning Lights,
Interior Lights, Warning Buzzers, Radio/Cassette, Compact Disc Player, Clock
5 - Empty (1990); 60 Amp (Yellow) (1991-94) Anti-Lock Brake System
6 - 30 Amp (Pink) Cooling Fan
7 - 10 Amp (Red) Air Bag
8 - 20 Amp (Yellow) A/C Additional Fan
9 - 10 Amp (Red) Fuel Injection
10 - 30 Amp (Pink) Headlight Retractor
TRUNK MOUNTED FUSE PANEL IDENTIFICATION

1991 Mazda MX-5 Miata
FUSES & CIRCUIT BREAKERS Fuses & Circuit Breakers 1990-95 Mazda
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