1997 MAZDA MX-5 sensor

Fig. 1: Air Bag System Component Identification
Courtesy of MAZDA MOTORS CORP.
Air bag deploys when ignition is on, crash sensor senses adequate deceleration, and SAS unit logic circuits
determine that the impact is sufficient to warrant deployment.
The SAS unit monitors the air bag system for failures. If a failure occurs, the SAS unit turns the AIR BAG
warning light on. If AIR BAG warning light is burned out, SAS unit will sound a buzzer to alert driver of a
system malfunction.

1997 Mazda MX-5 Miata
AIR BAG RESTRAINT SYSTEM 1997 ACCESSORIES/SAFETY EQUIPMENT Mazda - Air Bag Restraint System
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Fig. 5: Air Bag Deployment Tool Connector Identification
Courtesy of MAZDA MOTORS CORP.
Passenger-Side Air Bag
1. Before deploying air bag, inspect operating condition of Deployment Tool (49 H066 002). See
INSPECTING DEPLOYMENT TOOL
under DISPOSAL PROCEDURES. Ensure vehicle is in an
open space and away from other vehicles and people. Open doors. Open convertible top (if equipped).
Disconnect negative battery cable.
2. Remove glove compartment. Disconnect passenger-side air bag module connectors. See Fig. 4
. Connect
deployment tool connector to passenger-side air bag connector. See Fig. 5
. Connect Red deployment tool
clip to battery positive terminal. Connect Black deployment tool clip to battery negative terminal. Verify
deployment tool Red light is on.
3. Ensure all persons are at least 20 feet from vehicle. Press deployment tool activation switch to deploy air
bag. Because of heat generated from air bag deployment, wait at least 15 minutes before handling
deployed air bag module.
POST-COLLISION INSPECTION
POST-COLLISION AIR BAG SAFETY INSPECTION
ActionComponents
Replace After DeploymentAir Bag Module(s), Air Bag Sensor Unit
Inspect & If Damaged, Replace Component (Even Clockspring, Impact Sensors & Sensor Mountings,

1997 Mazda MX-5 Miata
AIR BAG RESTRAINT SYSTEM 1997 ACCESSORIES/SAFETY EQUIPMENT Mazda - Air Bag Restraint System
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REMOVAL & INSTALLATION
DRIVER-SIDE AIR BAG MODULE
Removal
Before proceeding, see SERVICE PRECAUTIONS . Disable air bag system. See DISABLING &
ACTIVATING AIR BAG SYSTEM . Remove driver-side air bag module nuts. Disconnect driver-side air bag
module connector. Disconnect support rope. See Fig. 6
. Remove driver-side air bag module.
If Air Bag Did Not Deploy)Steering Column, Steering Wheel, Wiring Harness
CommentsDO NOT attempt wiring harness repairs. Replace
entire harness. Impact sensors must always be
installed with arrow on sensor facing front o
f
vehicle.
WARNING:Follow air bag service precautions to prevent accidental air bag
deployment and personal injury. See SERVICE PRECAUTIONS
.
WARNING:DO NOT install driver-side air bag module unless DTC 6 is set. This can
cause accidental deployment of the air bag. Verify DTC 6 is indicated
before installing driver-side air bag module.
NOTE: After replacing components, check system to ensure proper operation. See
SERVICE PRECAUTIONS
.

1997 Mazda MX-5 Miata
AIR BAG RESTRAINT SYSTEM 1997 ACCESSORIES/SAFETY EQUIPMENT Mazda - Air Bag Restraint System
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ANTI-LOCK BRAKE SYSTEM
1997 BRAKES Mazda - Anti-Lock
DESCRIPTION
The Anti-Lock Brake System (ABS) control module senses reductions in front and rear wheel speed and
modulates hydraulic pressure to the brakes to prevent wheel lock-up. The ABS consists of a hydraulic unit, 4
wheel speed sensors and sensor rotors, valve relay, motor relay, pump motor and ABS control module. An ABS
warning light is located on the instrument cluster.
OPERATION
Under normal driving conditions, Anti-Lock Brake System (ABS) functions like a standard brake system. When
vehicle speed reaches 3.8 MPH, ABS will diagnose pump motor by briefly operating motor. Pump motor
operation may be heard inside vehicle.
ABS control module controls ABS by detecting speed sensor signals and activating solenoid valve in hydraulic
unit. Control module also controls pump motor and self-diagnostic function. If a problem is detected in ABS,
ABS will function like a conventional brake system. ABS warning light will also come on.
With detection of wheel lock-up, short pedal pulsations, occurring in rapid succession, will be felt in brake
pedal and steering wheel. Vehicle body may also vibrate slightly. These conditions are normal. Pedal pulsation
will continue until there is no longer a need for anti-lock function or until vehicle is stopped.
COMPONENT LOCATIONS
COMPONENT LOCATIONS CAUTION: See ANTI
-LOCK BRAKE SAFETY PRECAUTIONS article in GENERAL
INFORMATION.
NOTE: For more information on brake system, see BRAKE SYSTEM article.
ApplicationLocation
ABS Control ModuleUnder Carpet, Behind Passenger Seat
Data Link ConnectorLeft Side Of Engine Compartment
Front Sensor RotorOn Front Wheel Hub
Hydraulic UnitRight Rear Of Engine Compartment
Motor & Valve RelaysOn Hydraulic Unit
Pump MotorOn Hydraulic Unit
Rear Sensor RotorOn Rear Drive Axle
Wheel Speed SensorOn Knuckle

1997 Mazda MX-5 Miata
ANTI-LOCK BRAKE SYSTEM 1997 BRAKES Mazda - Anti-Lock

1997 Mazda MX-5 Miata
ANTI-LOCK BRAKE SYSTEM 1997 BRAKES Mazda - Anti-Lock
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(DLC). Set NGS Adapter (49-T088-003) to ABS. Select VEHICLE & ENGINE SELECTION, then select
vehicle model, engine type and model year. Select DIAGNOSTIC DATA LINK. Select ABS-ANTI
LOCK BRAKE MODULE.
2. Select DIAGNOSTIC TEST MODE and note any codes displayed. See DIAGNOSTIC TROUBLE
CODE DESCRIPTION table. Perform appropriate test. See DIAGNOSTIC TROUBLE CODE (DTC)
TESTING . Clear codes after servicing. See CLEARING CODES .
DIAGNOSTIC TROUBLE CODE DESCRIPTION
DTCProbable Cause
05 Stoplight Switch Wiring Harness
11 Right Front Wheel Speed Sensor/Sensor Rotor
12 Left Front Wheel Speed Sensor/Sensor Rotor
13 Right Rear Wheel Speed Sensor/Sensor Rotor
14 Left Rear Wheel Speed Sensor/Sensor Rotor
15 Wheel Speed Sensor/Sensor Rotor
22 (1) Right Front Solenoid Valve (AV)
23 (2) Right Front Solenoid Valve (EV)
24 (1) Left Front Solenoid Valve (AV)
25 (2) Left Front Solenoid Valve (EV)
26 (1) Rear Solenoid Valve (AV)
27 (2) Rear Solenoid Valve (EV)
51 Valve Relay
53 Motor Relay/Pump Motor
61 ABS Control Module
(1)Pressure retention valve.
(2)Pressure reduction valve.

1997 Mazda MX-5 Miata
ANTI-LOCK BRAKE SYSTEM 1997 BRAKES Mazda - Anti-Lock
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DTC 05: STOPLIGHT SWITCH WIRING HARNESS
1. Check stoplight switch wiring harness for open or short to ground between stoplight switch and ABS
control module. See WIRING DIAGRAMS
. Repair as necessary. If wiring harness is okay, go to next
step.
2. Clear DTCs. See CLEARING CODES under DIAGNOSIS & TESTING. Recheck for DTCs. If DTC 05
is displayed, replace ABS control module. If DTC 05 is not displayed, a temporary poor contact in wiring
may have occurred and ABS is now functioning properly.
DTCS 11, 12, 13 & 14: WHEEL SPEED SENSOR, SENSOR ROTOR, HYDRAULIC UNIT OR
WIRING HARNESS
1. Check ABS control module connector for poor connection. See COMPONENT LOCATIONS
. Repair
as necessary. If connector is okay, go to next step.
2. Check wiring harness for open or short to ground between suspect wheel speed sensor and ABS control
module. See WIRING DIAGRAMS
. Repair as necessary. If wiring harness is okay, go to next step.
3. Check suspect wheel speed sensor. See WHEEL SPEED SENSORS under COMPONENT TESTING
.
Replace as necessary. If wheel speed sensor is okay, go to next step.
4. Inspect wheel speed sensor rotor for damage or missing teeth. If sensor rotor is damaged or has missing
teeth, replace sensor rotor. If sensor rotor is okay, go to next step.
5. Inspect brakeline for damage. If brakeline is damaged, replace brakeline. If brakeline is okay, go to next
step.
6. Check hydraulic unit. See HYDRAULIC UNIT under COMPONENT TESTING
. Replace as
necessary. If hydraulic unit is okay, go to next step.
7. Clear DTCs. See CLEARING CODES
under DIAGNOSIS & TESTING. Recheck for DTCs after
driving vehicle from a stop to faster than 6.2 MPH. If DTC 11, 12, 13 or 14 is displayed, replace ABS
control module. If DTC 11, 12, 13 or 14 is not displayed, a temporary poor contact in wiring may have
occurred and ABS is now functioning properly.
DTC 15: WHEEL SPEED SENSOR, SENSOR ROTOR, HYDRAULIC UNIT OR WIRING HARNESS
If DTC 15 is displayed, perform DTCS 11
, 12, 13 & 14: WHEEL SPEED SENSOR, SENSOR ROTOR,
HYDRAULIC UNIT OR WIRING HARNESS test.
DTCS 22, 23, 24, 25, 26 & 27: SOLENOID VALVE OR WIRING HARNESS
1. Check ABS control module connector for poor connection. See COMPONENT LOCATIONS
. Repair
as necessary. If connection is okay, go to next step.
2. Check suspect solenoid valve with valve relay installed. See SOLENOID VALVES
under
COMPONENT TESTING. Replace as necessary. If solenoid valve with valve relay installed is okay, go
to next step.
3. Check suspect solenoid valve with valve relay removed. See SOLENOID VALVES
under
COMPONENT TESTING. Replace solenoid valve as necessary. If solenoid valve with valve relay
removed is oka
y, go to next step.

1997 Mazda MX-5 Miata
ANTI-LOCK BRAKE SYSTEM 1997 BRAKES Mazda - Anti-Lock
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Fig. 12: Identifying Valve Relay Terminals
Courtesy of MAZDA MOTORS CORP.
WHEEL SPEED SENSORS
On-Vehicle Inspection
Remove wheel. Inspect wheel speed sensor for looseness and damage. Replace as necessary. Measure clearance
between wheel speed sensor and sensor rotor. See Fig. 13
. Clearance should be .012-.043" (.3-1.1 mm). If
clearance is not as specified, replace wheel speed sensor or sensor rotor.
Resistance Test
Disconnect wheel speed sensor connector. Using ohmmeter, measure resistance between wheel speed sensor
terminals. Resistance should be 800-1200 ohms. If resistance is not as specified, replace wheel speed sensor.
Voltage Test
Ensure vehicle is on level surface. Raise and support vehicle on safety stands. Disconnect wheel speed sensor
connector. Using voltmeter, while rotating wheel one revolution per second, measure voltage between wheel
speed sensor terminals. Voltage should be .25-1.2 volts (AC). If voltage is not as specified, replace wheel speed

1997 Mazda MX-5 Miata
ANTI-LOCK BRAKE SYSTEM 1997 BRAKES Mazda - Anti-Lock
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sensor or sensor rotor.
Fig. 13: Measuring Wheel Speed Sensor Clearance

Courtesy of MAZDA MOTORS CORP.
WHEEL SPEED SENSOR ROTORS
Inspection
Perform a comprehensive visual inspection of wheel speed sensor rotor. If any teeth are damaged or missing, or
any other damage is noted, replace wheel speed sensor rotor.
REMOVAL & INSTALLATION
ABS CONTROL MODULE
Removal & Installation
1. Disconnect negative battery cable. Roll back carpet from passenger-side footwell. Remove ABS control
module protector panel (if equipped).

1997 Mazda MX-5 Miata
ANTI-LOCK BRAKE SYSTEM 1997 BRAKES Mazda - Anti-Lock
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