Mazda MX-5 Miata (1997+). Manual — part 7

Fig. 1: Identifying Data Link Connector (DLC) Terminals
Courtesy of MAZDA MOTORS CORP.

ABS WARNING LIGHT REMAINS ILLUMINATED DURING DRIVING UNTIL IGNITION IS
TURNED OFF

1. Check for ABS DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES under DIAGNOSIS &

TESTING. If no DTCs are present, go to next step.

2. Check ABS Control Module (ABS CM) connector for poor connection. Drive vehicle and recheck ABS

warning light. If ABS warning light remains illuminated during driving and goes out when ignition is
turned off, replace ABS CM. If ABS warning light does not remain illuminated during driving, a
temporary poor contact in wiring may have occurred and ABS is now functioning properly.

ABS WARNING LIGHT ILLUMINATES/GOES OUT WITH VEHICLE STOPPED AND DURING
DRIVING

1. Check for ABS DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES under DIAGNOSIS &

TESTING. If no DTCs are present, go to next step.

2. Turn ignition off. Disconnect ABC Control Module (ABS CM) connector. See COMPONENT

LOCATIONS . Turn ignition on. Check if ABS warning light illuminates. If ABS warning light
illuminates, go to next step. If ABS warning light does not illuminate, repair ABS warning light wiring
harness or instrument cluster.

1997 Mazda MX-5 Miata

ANTI-LOCK BRAKE SYSTEM 1997 BRAKES Mazda - Anti-Lock

3. Turn ignition off. Disconnect ABS CM connector. Measure voltage between terminals "A" and AB of

ABS CM harness connector. See Fig. 3 . Also, measure voltage between terminals "A" and AC of ABS
CM ha rness connector, and between terminals "A" and AM of ABS CM harness connector. If battery
voltage is present, go to next step. If battery voltage is not present, repair wiring harness.

4. Turn ignition off. Reconnect ABS CM connector. Drive vehicle and recheck ABS warning light. If ABS

warning light illuminates/goes out with vehicle stopped and during driving, replace ABS CM. If ABS
warning light does not illuminate/go out with vehicle stopped and during driving, a temporary poor
contact in wiring may have occurred and ABS is now functioning properly.

ABS WARNING LIGHT INDICATES NORMAL, BUT ABS DOES NOT OPERATE PROPERLY

Check for ABS DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES under DIAGNOSIS &
TESTING. If no DTCs are present, inspect mechanical system.

PRE-DIAGNOSIS INSPECTION

Visually inspect ABS components for possible cause of anti-lock problem. Visual inspection may help identify
cause of a simple malfunction. Ensure ABS warning light is functioning properly. See TROUBLE
SHOOTING .

ABS warning light illuminates under the following conditions:



Vehicle operated on snow or ice with parking brake activated, or a dragging brake at one wheel.



Different size tires being used.



Tires with different traction characteristics are used on same axle.



Vehicle is jacked up and drive wheels spin for 20 seconds or more with ignition on.



Low battery voltage.

If ABS warning light illuminates because of these conditions, turn ignition off, then back on. ABS warning light
will go out and no DTCs for described conditions will be stored in ABS control module memory.

DIAGNOSIS & TESTING

Diagnose ABS using New Generation Star (NGS) Tool (49-T088-0A0) and Adapter Harness (49-F066-002).
See RETRIEVING DIAGNOSTIC TROUBLE CODES . On all models, test ABS control module using
DVOM and adapter harness. See ABS CONTROL MODULE under COMPONENT TESTING .

If ABS test equipment is unavailable, test each component of ABS. See COMPONENT TESTING . If all
ABS components test okay, replace ABS control module with a known-good module and retest system.

RETRIEVING DIAGNOSTIC TROUBLE CODES

Using New Generation Star (NGS) Tool

1. Turn ignition off. Connect New Generation Star (NGS) Tool (49-T088-0A0) to Data Link Connector

1997 Mazda MX-5 Miata

ANTI-LOCK BRAKE SYSTEM 1997 BRAKES Mazda - Anti-Lock

(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

DTC

Probable 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

Fig. 2: Reading Diagnostic Trouble Code Output
Courtesy of MAZDA MOTORS CORP.

CLEARING CODES

1. Turn ignition off. Connect a jumper wire between TBS terminal and GND terminal of Data Link

Connector (DLC). See Fig. 1 . Turn ignition on. Output all diagnostic trouble codes stored in ABS control
module memory. When first code is repeated, depress brake pedal 10 times at intervals of less than one
second.

2. When codes are cleared, ABS warning light will illuminate for 3 seconds, then go out. ABS operation

should return to normal control. If ABS warning light does not operate as described and ABS does not
return to normal operation, repeat procedure ensuring brake pedal interval does not exceed one second.

DIAGNOSTIC TROUBLE CODE (DTC) TESTING

* PLEASE READ FIRST *

NOTE:

Disconnecting battery does not clear Diagnostic Trouble Codes (DTCs). If DTCs
will not clear, ensure stoplight switch is functioning properly.

NOTE:

See PRE-DIAGNOSIS INSPECTION and DIAGNOSIS & TESTING before
proceeding with DIAGNOSTIC TROUBLE CODE (DTC) TESTING. After repairs
are complete, clear DTCs from ABS control module memory. See CLEARING
CODES under DIAGNOSIS & TESTING.

1997 Mazda MX-5 Miata

ANTI-LOCK BRAKE SYSTEM 1997 BRAKES Mazda - Anti-Lock