1994 MAZDA MX-5 relay

K ON-BOARD DIAGNOSIS SYSTEM Ill I 4. Connect the SST (Self-Diagnosis Checker) to the SST (System Selector) and a ground. 5. Set the SELECT SW to position A. 6. Turn on the ignition switch. ii 7. Verify that "88" flashes on the digital display and that the buzzer sounds for 3 seconds. 8. If "88" does not flash, check the main relay and 2s and 2Q terminals of the powertrain control module (transmis- sion) for an open or short circuit. 9. If "88" flashes and the buzzer sounds continuously for more than 20 seconds, check the wiring to terminal 1C of the powertrain control module (Transmission) for an open or short circuit. If necessary, replace the powertrain control module (Transmission) and repeat from step 2. 10. Note any code(s) and check for the cause(s). Repair as necessary. (Refer to page K-12.) 11. After repairs are made, do the After-Repair Procedure (page K-21) to verify that there are no remaining codes. Troubleshooting If a diagnostic trouble code is shown on the SST (Self-Diagnosis Checker), check for the cause by using the ch&t related to the code shown. Diagnostic trouble code ~U)DE NO. 1 LOCATION OF MALFUNCTION I BUZZER (HOLD INDICATOR LIGHT FLASH CYCLE) Throttle position sensor or circuit 06 Vehicle speed sensor or circuit 55 ON OFF Vehicle speed pulse generator or circuit 60 - 61 1-2 shift solenoid valve or circuit 62 - -- - 3-2 control solenoid valve or circuit 64 T 2-3 shift solenoid valve or circuit 63 - 3-4 shift solenoid valve or circuit -----a Lockup control solenoid valve or circuit -- --i---- - - - audrur - -, -. - 0.4 sec. - --I-& cl.2sec + 2 1.6sec * - 4 sec - - Gartner Banana

Before beginning any service procedure. refer to section T of this manual for air bag system service warnings and audio antitheft system alarm conditions . BRAKING SYSTEM INDEX ....................................... P- 2 OUTLINE ..................................... P- 4 SPEClFlCATlONS ........................... P- 4 BRAKE SYSTEM ............................. P- 5 PREPARATION ............................. P- 5 TROUBLESHOOTING GUIDE ................ P- 6 AIR BLEEDING ............................. P- 7 BRAKE HYDRAULIC LINE ................... P- 7 BRAKE FLUID .............................. P- 8 ............................. BRAKE PEDAL P- 9 MASTER CYLINDER (STANDARD) ............ P-11 MASTER CYLINDER (ABS) .................. P-14 POWER BRAKE UNIT ....................... P-20 PROPORTIONING BYPASS VALVE ........... P-23 FRONT BRAKE (DISC) ...................... P-25 CALIPER ................................... P-28 REAR BRAKE (DISC) ........................ P-29 CALIPER ................................... P-32 PARKING BRAKE SYSTEM .................... P-34 TROUBLESHOOTING GUIDE ................ P-34 PARKING BRAKE LEVER .................... P-34 PARKING BRAKE CABLE .................... P-36 ANTILOCK BRAKE SYSTEM (ABS) ............ P-37 DESCRIPTION .............................. P-37 PREPARATION ............................. P-37 TROUBLESHOOTING GUIDE ................ P-38 CIRCUIT DIAGRAM ......................... P-52 HYDRAULIC UNIT ........................... P-53 ........................ ABS CONTROL UNIT P-55 RELAYS .................................... P-56 ABS WHEEL SPEED SENSOR (FRONT) ....... P-58 ABS SENSOR ROTOR (FRONT) .............. P-59 ABS WHEEL SPEED SENSOR (REAR) ........ P-60 ABS SENSOR ROTOR (REAR) ............... P-61 25UOPX-001 Gartner Banana

INDEX P ANTILOCK BRAKE SYSTEM (ABS) 1. Hydraulic unit 5. ABS sensor rotor (front) Removal / Installation ......... page P-53 Removal / Ins~ection / ................. Disassembly / Assembly ...... page P-54 Installation page P-59 2. ABS control unit 6. ABS wheel-speed sensor (rear) Removal I Installation ......... page P-55 Removal 1 Inspection I ................. 3. Relays Installation page P-60 Removal / Inspection / 7. ABS sensor rotor (rear) ......... ................. w Installation page P-56 Removal / Inspection page P-61 .................. 4. ABS wheel-speed sensor (front) Installation page P-62 Removal / Inspection / ................. Installation page P-58 Gartner Banana

P ANTILOCK BRAKE SYSTEM (ABS) MOTOR RELAY I I VALVE RELAY / I Check motor relay 1. Disconnect the negative battery cable. 2. Remove the motor relay. 3. Connect an ohmmeter and check for continuity at the .,i relay terminals. 4. If continuity is not as specified, replace the motor relay. 5. If OK, check the wiring harness (Motor relay - Control unit main fuse [ABS 60A1). Check pump motor Disconnect the control unit 2-pin connector and check for continuity between terminal a (FIN) wire and ground. If there is no continuity, replace the hydraulic unit. d 0 Check valve relay 1. Disconnect the negative battery cable. 2. Release the valve relay locks from the hydraulic unit and remove the valve relay. 3. Using an ohmmeter, check continuity of the relay termi- nals. M: Indicates continuity Connect to a 0 12V - c I b d 0 I I C++3: lndicates continuity Ground - b 4. If continuity is not as specified, replace the valve relay. b 0 e Connect to 12V I Ground c 0 a b c d Gartner Banana

ANTILOCK BRAKE SYSTEM (ABS) P ABS CONTROL UNIT 35-PIN CONNECTOR OHMMETER 15UOPX-OI Check rotor Check the rotor for missing or damaged teeth and replace as necessary. Check alternator Refer to section G. Check wheel-speed sensor Caution To prevent damage to the terminals, create a probe by wrapping a thin wire around the tester lead before inserting. 1. Using an ohmmeter, check for continuity at the control unit connector terminals. 0----0: Indicates continuity Right front Left rear Right rear 2. If the continuity is not as specified, check the wiring har- ness (Wheel-speed sensor - Control unit). 3. If the continuity is OK, check voltage between 1K and 1 G, 10 and 1 Q, 1 U and 1 F, and 1 L and 1 P while rotating the wheel one rotation per second by hand. 4. If voltage is not approximately 50 mV--60 mV, the wheel-speed sensor is faulty. 5. If voltage is approximately 50 mV-60 mV, the control unit is faulty. 1L Check hydraulics Verify that all brake fluid connections are tight and that no fluid is leaking. IP 1Q Left front 0--0 Check hydraulic unit wiring 1. Verify that the hydraulic unit connectors are properly secured. 2. Verify that the valve relay and motor relay are properly secured. IG 1K 0-4 1U 10 S-0 IF 0-4 Gartner Banana

ANTILOCK BRAKE SYSTEM (ABS) P HYDRAULIC UNIT Removal 1 lnstallation 1. Disconnect the negative battery cable. - 2. Remove in the order shown in the figure, referring to Removal Note. 3. The only serviceable parts of the hydraulic unit are the valve relay and the motor relay. If there is a failure of any other part, replace the hydraulic unit assembly. 4. Install in the reverse order of removal, referring to Installation Note. 5. Add brake fluid, bleed the air, and check for fluid leakage. 1. Connectors 3. Nut bolts 2. Brake pipes 4. Hydraulic unit Removal / lnstallation Note . . . . page P-55 Gartner Banana

P ANTILOCK BRAKE SYSTEM (ABS) Disassembly 1 Assembly 1. Disassemble in the order shown in the figure. 2. Assemble in the reverse order of disassembly, referring to Assembly Note. 2.2-2.6 Nm [22-27 kgfcm, 2&29 [2--3,14--22) 6.9-9.8 Nm (70-1 00 kgfcm, 81-47 Inlbf) 1 15--25 11 S-2.5,11-18) 19-25 [1.92.6,14--19) t4.m [kgfm, Wlbf) 25uopx-o: 1. Nut, washer . 2. ABS bracket 3. Connector bolt 4. Gasket 5. Pipe joint 6. Bolt 7. Clip Installation Note 8. Cover 9. Motor relay ................... Inspection page P-56 10. Valve relay ................... Inspection page P-57 11. Casing 12. Mount 13. Stud ................. below 14. Nut, washer 15. Ground wire 16. Hydraulic unit Assembly note A SECTION A-A Clip Secure only the larger part of the wiring harness in the clips. The 2-pin connector part of the harness should re- main outside the clips. Gartner Banana

P ANTILOCK BRAKE SYSTEM (ABS) RELAYS Removal 1 Inspection / Installation 1. Disconnect the negative battery cable. 2. Remove in the order shown. 3. Inspect all parts and replace as necessary. 4. Install in the reverse order of removal. 1. Cover 3. Valve relay 2. Motor relay Inspection ................... page P-57 Inspection ....................... below lnspection Motor relay 1. Disconnect the negative battery cable. 2. Release the motor relay lock from the hydraulic unit and remove the motor relay. 3. Connect an ohmmeter and check for continuity at the relay terminals. Ground M: Indicates continuity 4. If continuity is not as specified, replace the motor relay. 5. If OK, check the wiring harness (Motor relay - Control unit main fuse [ABS 60A1). Gartner Banana