lock MAZDA MX-5 1994 Workshop Manual

P ANTILOCK BRAKE SYSTEM (ABS) (Cont .) I THEN YES LIGHT? NO (Is AntlLock Light On?) PRESS: -OR - t CHK ANTILOCK (Check AntlLock Llght) I T HEN I PRESS: PRESS THE BRAKE PEDAL FIRMLY ANDHOLO PRESSURE I THEN + !YES PRESSED? NO! PRESS: Q -0R- IF NO FAULTS ARE DETECTED, TESTER WILL DISPLAY IF A FAULT IS DETECTED TESTER WILL DISPLAY: PRESS: ql Gartner Banana

ANTILOCK BRAKE SYSTEM (ABS) P I*I (LISTEN) WSH EITHER SWITCH, AND LISTEN FOR PUMP MOTOR TO RUN. (NOTE: PUMP WlLL RUN FOR 5 SfCONDS MAXIMUM.) IF NO FA MT ECTE WlLL 01s 1 IF FAULT IS DETECTED TESTER WlLL DISPLAY: .TS ARE TESTER AY. THEN YOU MUST RESPOND WITHIN 5 SECONDS OR PUMP WlLL SHUT OFF, AND TESTER RETURNS TO START OF "SC PUMP TEST". PRESS: 6 I PRESS: -OR- 0-1' 1 STAT TEST DYNAM (Sc*iclb*l I TESTER WILL TESTER 9 WILL RETURN TO AWANCE TO "SA. ANTI-LOCK NEXT TEST LlQHT TEST". Gartner Banana

ANTILOCK BRAKE SYSTEM (ABS) THESE THREE MESSAGES WlLL ALTERNATE ON THE DISPLAY SCREEN AT 3 112 SE- COND INTERVALS. NOW, SELECT ONE OF THE FOUR WHEELS TO BEGIN THE DY- NAMIC T EST SEQUENCE. PRESS EITHER SWITCH UN- DER "PUSH TO EXIT" DIS- PLAY TO RETURN TO "STAT TEST DYNAM" SELECTION. IMPORTANT: WHEN ENTERING THE DY- NAMIC TEST SEQUENCE, YOU WlLL SELECT ONE OF FOUR WHEELS TO BEGIN. WHEN YOU HAVE FINISHED WITH THAT WHEEL TEST. YOU SHOULD RETURN TO 6A "WHEEL SELECTION". TO SELECT ANOTHER WHEEL. AND REPEAT THESE TEST PROCEDURES FOR ALL FOUR WHEELS. 68. WHEEL SENSOR TEST NOTE: FOR EAcn OF TnE WHEEL TESTS. IT IS NECESSARY TO RAISE THE WHEEL(S) BEING TESTED OFF THE FLOOR. (WHEN TESTING REAR WHEELS. BOTH WHEELS MUST BE RAISED OFF THE FLOOR.) DISPLAY WlLL SHOW THE WHEEL WHICH YOU SELECTED IN EST 6A I HAVE YOUR ASSISTANT SPlN THE WHEEL INDICATED WHILE YOU WATCH THE TESTER. IF SPEED IS INCORRECT, TESTER WlLL DISPLAV: SPIN SLOWER I Gartner Banana

ANTILOCK BRAKE SYSTEM (ABS) P 6B. WHEEL SENSOR TEST 6C. SOLENOID TEST (Cont.) I I NOfE: EACH OFTHE TWO SOLENOID TESTS FOR EACH WHEEL CAN BE CONDUCTED FOR A MAXIMUM OF 15 SECONDS. IF TIME LIMIT IS EXCEEDED. TESTER WILL DISPLAY: I TRY TEST AGAIN I PUSH TEST 1 I PUSH EITHER SWITCH TO START THIS TEST. TESTER WILL DISPLAY: PRESS BRK.. . HOLD I APPLY FIRM PRESSURE TO BRAKE PEDAL. AND FIRMLY THROUGH SOLENOID TEST 1 AND TEST 2. I t (Cont.) Gartner Banana

P ANTILOCK BRAKE SYSTEM (ABS) CAN A! 'RESS: ,- PRESS: TESTER WILL TESTER WILL RETURN TO 5A RETURN TO 6A Gartner Banana

ANTILOCK BRAKE SYSTEM (ABS) P N. SOLENOID TEST HAST HE WHEEL STOPPED SPINNING . AND LOCKED IN PLACE IF NO FAULTS TESlERn low THEN 1 PRESS: 0 -OR- b- I STAT TEST DYNM I I ~ESTGR WILL TESTER WILL RETURN TO SA RETURN TO 8A 41% EITHER SWITCU TO START THIS TEST (mww AWLVIM ~RM pmmmr TO MAKE CCMU IE DETECTED. I W A FAULT IS DETECTED. .AWAME TESTIRmLMIICLAYEITMR STEP. &N MEW: -on- mnw: 1 (Cont .) Gartner Banana

P ANTILOCK BRAKE SYSTEM (AM) 6C. SOLENOID TEST AND IS IT SPINNING? CHECK HYDRAULICS I 1 J PRESS: -OR - I I 1 [STAT TEST DYNAM~ PRESS: 1 TESTER WILL TEST~R WILL RETURN TO 5A RETURN TO 6A 1 YES LOCKED? NO HASTHE WHEEL STOPPEO SPINNING AND LOCKED IN PLACE? 'RESS: i +I BRAKE PRESS: '->I THEN I I PRESS: + TESTER WILL RETURN TO SA TESTER WILL RETURN TO 6A I c IMPORTANT-CONTINUE TO RETURN TO 6A UNTIL ALL FWR WHEELS HAVE BEEN ESTED. Gartner Banana

ANTILOCK BRAKE SYSTEM (ABS) P Inspection of ABS system Check system ground Caution To prevent damage to the terminals, create a probe by wrapping a thin wire around the tester lead before inserting. Check for an open circuit in (B) wire from terminals 1 Dl 1 S, and 2F of the control unit connector and ground. Check antilock warning light 1. Remove the instrument cluster. 2. Connect 12V to terminal 2K (C-Ol), and ground to termi- nal 1 K ((2-01). 3. Verify that the ABS warning light illuminates. 4. If there is no illumination, check the meter fuse, bulb, and wiring harness. 5. If OK, check the wiring harness (Warning light - Control unit - Hydraulic unit) and repair or replace as necessary. Check ABS diode 1. Check the meter fuse, bulb, and wiring harness. 2. Check the wiring harness (Warning light - Control unit - Hydraulic unit). 3. Disconnect the hydraulic unit 12-pin connector. 4. Using an ohmmeter, check for continuity of the terminals. 5. If continuity is not as specified, replace the hydraulic unit. Check front and rear valves 1. Disconnect the hydraulic unit 12-pin connector. 2. Using an ohmmeter, check for resistance of the termi- nals. -- 3. If resistance is not as specified, replace the hydraulic unit. 4. If resistance is as spe'cified, check the wiring harness (Hydraulic unit - ABS control unit). E (YIG) - H (B) (Rear Valve) C (BR) - H (B) (Right Front Valve) A (B/W) - H (B) (Left Front Valve) Check brake light switch 1. Disconnect the brake light switch connector. 2. Check for continuity between the terminals of the switch. Resistance (n) Approx. 1 .O-1.2 Approx. 1.0-1.2 Approx. 1 .+I .2 M : Indicates continuity Depressed brake pedal 3. If the continuity is not as specified, check the STOP fuse and wiring harness (Brake light switch - Control unit). 0 I 0 Released brake pedal 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