1994 MAZDA MX-5 Workshop Manual

P ANTILOCK BRAKE SYSTEM (ABS) Troubleshooting procedure 2. ALTEnuAtOR TEST START mtmE (ALTWJATOR TESTED BY RWNa ENQlNE) 3. A88 SYSTEM TEST TURN IGNITION K€Y ON (00 NOT ROES EWWE) - - 1. LOCATE ABS CONTROL UNIT. 2. DISCONNECT CONTROL UNlT HARNESS CONNECTOR FROM CONTROL UNIT. 3. CONNECT ABS TESTER HARNESS TO CONTROL UNlT HARNESS CON- NECTOR. 4. TURN IGNITION KEY TO ON POSITION. TESTER WlLL RAPIDLY DISPLAY SEVERAL MESSAGES DURING AN INITIAL SEGMENT CHECK I THEN 1 I MAZDA ABS 2 TEST 1 4 I YES ENG RUN? NO 1 I MAZDA ALT TEST I CHK ALTERNATOR NO FAULT DETECTED t I TURN OFF ENGINE I TESTER WlLL RAPIDLY DISPLAY SEVERAL MESSAGES DURING AN INITIAL SEGMENT CHECK. I THEN t 1 YES ENG RUN? NO t 1 MAZDA ABS 2 TEST I Gartner Banana

ANTILOCK BRAKE SYSTEM (ABS) P 4.8Y8TW VOLTAQE CHECKS * AFTER DISPLAY INDICATES A FAULT MESSAGE. REFER TO APPLCABLE SHOP MANUAL FOR ADDITIONAL DIAGNOSTIC INF OR- MATION. (Cont .) I TESTER AUTOMATICALLY PERFORMS MULTIPLE SYSTEM VOLTAGE TESTS IF NO FAULTS ARE IF FAULTS ARE DETECTED. TESTER DETECTED. TESTER WILL DISPLAY THE CORRESPOND- WILL ADVANCE TO ING FAULT MESSAGE(S) AS SHOWN NEXT TEST. BELOW. VALVE +, iLeI1 Fronl Valve Ogln) RF VALVE OPEN ( (R9M Fronl Valve Open) IREAR VALVE OPEN/ CHK ABS DIODE (Check ABS 01ode) CHK CONT MOD GND (Chock Control Module Ground) CHK SYSTEM GND (Check Syslrm Ground) CHK LF SPD SENS (Check Left Fronl SpHd Sm.wl CHK RF SPD SENS (Check R9hl Fronl Sped Sonsor) CHK LR SPD SENS (Check Left bar Sp..d Smw) CHK RR SPD SENS (Check Rghl Rear S.nror) I TESTER DISPLAY WlLL ALTERNATE ABOVE MESSAGES WITH I /YES CONTINUE? NO[ - & TESTER WlLL DISPLAY PRESS: -0A- SAME FAULT MESSAGE. 1 IF NO ADDITlbNAL FAULTS IF ADDITIONAL FAULTS ARE ARE DETECTED. TESTER WlLL DETECTED, TESTER WlLL ADVANCE TO NEXT TEST. DISPLAY NEXT FAULT I MESSAGE. 1 (Cant.) Gartner Banana

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