From the factory workshop manual:
Note: The DTC items should be available through a normal OBD2 code reader as "C" codes, however, if you do not have a code reader, this will let you retrieve the ABS codes anyway.2005 - Miata - Workshop Manual - BrakesABS ON-BOARD DIAGNOSISOn-Board Diagnostic (OBD) Test Description
- The OBD test inspects the integrity and function of the ABS and outputs the results when requested by the specific tests.
- On-board diagnostic test also:
- Provides a quick inspection of the ABS.
- Is usually performed at the start of each diagnostic procedure.
- Provides verification after repairs to ensure that no other faults occurred during service.
- The OBD test is divided into 3 tests:
- Read/clear diagnostic results, PID monitor and record and active command modes.
- Read/clear diagnostic results
- This function allows you to read or clear DTCs in the ABS HU/CM memory.
- PID/data monitor and record
- This function allows you to access certain data values, input signals, calculated values, and system status information.
- Active command modes
- This function allows you to control devices through the SST (WDS or equivalent).
Reading DTCs ProcedureUsing SST (WDS or equivalent)1. Connect WDS or equivalent to the vehicle DLC‐2 16‐pin connector located on the left side of the steering column.
2. Retrieve DTC with WDS or equivalent.
Without using SST (WDS or equivalent)CAUTION:
Connecting to the wrong DTS terminal may cause a malfunction. Carefully connect only to the specified terminal.1. Connect the TBS terminal at DLC to body ground using a jumper wire.
2. Turn the ignition key to ON (engine OFF).
3. After the ABS warning light illuminates for 3 seconds, the ABS warning light indicates DTCs.
4. After completion of repairs, clear DTCs.
Clearing DTCs ProceduresUsing SST (WDS or equivalent)After repairs have been made, perform the Reading DTCs Procedure.
1. Erase DTC with WDS or equivalent.
Without using SST (WDS or equivalent)CAUTION:
Connecting to the wrong DTS terminal may cause a malfunction. Carefully connect only to the specified terminal.1. Connect the TBS terminal at the DLC to body ground using a jumper wire.
2. Turn the ignition key to ON (engine OFF).
3. Output all stored DTCs.
4. After verifying that the first code is repeated, depress the brake pedal 10 times or more at intervals of less than 1 seconds.
5. Turn the ignition key to OFF and disconnect the jumper wire.
NOTE:
DTCs cannot be cleared if the following occur:
a. If intervals of depressing the brake pedal exceed 1 seconds.
b. The brake switch has failed.PID/Data Monitor and Record Procedure
1. Connect WDS or equivalent to the vehicle DLC-2 16-pin connector located on the left side of the steering column.
2. Access and monitor PIDs with WDS or equivalent.
Active Command Modes Procedure
1. Connect WDS or equivalent to the vehicle DLC-2 16-pin connector located on the left side of the steering column.
2. Turn the ignition key to ON (Engine OFF) or start engine.
3. Activate active command modes with WDS or equivalent.