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1. u e REAL WORLD Fim WWAL Olagnosin Dee owner of an TO pc up tuac romper that the wi Ores wearing enp on fie Oost semine nn emm wher fs pirinc wate woe efeassc lhu matma cam Zw ara uf he Doug A walleye yoke pulis Ow rhe Tus phon oF eter tee Deter rae fem 4 MT trube lary ie frs PRAGA Meet be metet Dom tection aput rat te Dosen proc wat Ty elise Uu tft an ertiocs tratung Ihe wes Stad The teat 390p n Gao wer enm atio bono rere tff a Gash bangs on y Mo Check few uice um fte conten Tw dte tti send o rt puer beer wer A ated Hon The DUC ALSI ax fus awe uf wh fre Waiter Paisi g coo om 4 mc erty a temo net come d oem Hered te be s gx pakiri jpe te ferret conti seid The ae Fata i tw Ime wes Getty aces t o me oco ment of Tw Ocftecphrse Serine grovemso Wn After Dipesing The slm ww o Tuwuh st ames Te im pono ax PmWAL md Correctly ALWAYS LEARNING A Automotive Technology Fifth Edition PEARSON James Halderman had WF ABS DIAGNOSIS AND SERVICE amp REAL WORLD FIX te i ME The Nervous Taurus A customer compeained that sometimes during normal braking the AGS would be actwated just before coming lo a stop Howwver the ABS Soft wodo not come oen The sarvice tochnician was abia to duplicate the conditon and there were no DTCs stored Using a scan Idol to moniter the wheol npaed nnnvaors the technician decoversd that Wwe heft front where sowed wuss sbghlly different a the ofvers A th2. ES T mT 107 ABS DIAGNOSIS AND SERVICE Automotive Technology Fifth Edition P ALWAYS LEARNING gy James Halderman EARSON we I ABS DIAGNOSIS AND SERVICE x Figure 107 1 On most vehicles equipped with ABS the amber ABS and red BRAKE warning lamp should come on as a bulb check when the ignition is first switched on Automotive Technology Fifth Edition pP ALWAYS LEARNING gy James Halderman EARSON p IF ABS DIAGNOSIS AND SERVICE J v Figure 107 2 A thorough visual inspection should include carefully inspecting around the electrohydraulic unit for signs of obvious problems or the installation of aftermarket devices such as alarm systems Automotive Technology Fifth Edition P ALWAYS LEARNING gy James Halderman EARSON rr I ABS DIAGNOSIS AND SERVICE TECH TIP ALWAYS LEARNING 4utom hnology Fifth Edition PEARSON James n T WOR ABS DIAGNOSIS AND SERVICE FREQUENTLY ASKED QUESTION What s That Notes and Vibration dithebed to ley are feet an occasional groaning nose It i uoua Fond anc felt trroagh the vernice after finer buing sturiad ane driver Bacaute occurs when tent be yg Given i formed oF reverse many Technicians have dlarned thn trararnission of related driveline componentn Tie 6 cemmanty heard on many ABS welvolas aa part of a system check Ar soon as the ABS controller aereis spesd bom thie swivel tene sensors ater en ignition eyclus ort ihe conteoteor wil run ihe pump ether
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4. every fime or whee aor the aceumciator pesmsung amp below a certain asui This can occur while the vehicle is being backed aut of a dive Way or being driven forward because wheel sensors cam only detect apeed not direction Balora senous and mayor topaia are attemoted to curs a noise malle sure that it is tot the normal ARG self thes activatiin sequence of avaris James Halderman ALWAYS LEARNING Automotive Technology Fifth Edition P E A RS N rr I ABS DIAGNOSIS AND SERVICE EY Figure 107 3 General Motors diagnostic connector on a pre 1996 vehicle Flash codes are available by using a jumper wire to ground terminal A to terminal H GROUND HiME Ae A H TOOL James Halderman ALWAYS LEARNING A Automotive Technology Fifth Edition P E A RS N wr Wey ABS DIAGNOSIS AND SERVICE Figure 107 4 Connecting a jumper wire from the diagnostic connector to ground The exact location of this diagnostic connector varies with the exact vehicle model and year COMPUTER MODULE DIAGNOSTIC CONNECTOR CONNECT JUMP A WIRE MERE Automotive Technology Fifth Edition P ALWAYS LEARNING gy James Halderman EARSON ww Wey ABS DIAGNOSIS AND SERVICE Figure 107 5 Chrysler diagnostic connector location varies with the model and year DIAGNOSTIC CONNECTOR RIGHT COWL PANEL ALWAYS LEARNING Automotive Technology Fifth Edition PEARSON James Halderman p IF ABS DIAGNOSIS AND SERVICE
5. is determined by the speed of the rotating sensor TOOTHED ASA A 7L 7I Nii RING SENSOR GAP ELECTRONIC BRAKE CONTROL MODULE EBCM Automotive Technology Fifth Edition pP ALWAYS LEARNING gy James Halderman EARSON ya Figure 107 10 Measuring the resistance of a wheel speed sensor WHEEL SPEED SENSOR CONNECTOR ALWAYS LEARNING Automotive Technology Fifth Edition PEARSON James Halderman had WF ABS DIAGNOSIS AND SERVICE Figure 107 11 A scope can be used to check for proper operation of a wheel speed sensor JA ELLE LAU Automotive Technology Fifth Edition P ALWAYS LEARNING f James Halderman EARSON had WOR ABS DIAGNOSIS AND SERVICE Li a Figure 107 12 A broken tooth on a wheel speed sensor tone ring shows on the scope trace as a missing wave L Li D i p SViee NF St mj Automotive Technology Fifth Edition P ALWAYS LEARNING gy James Halderman EARSON bad WF ABS DIAGNOSIS AND SERVICE Figure 107 13 Use a nonmagnetic brass or plastic feeler gauge to check wheel speed sensor gap j A steel gauge would be attracted by the magnet in the sensor and would produce a drag on the gauge as it is moved between the sensor and the tone ring This drag could be interpreted as a correct clearance reading TONE WHEEL SPEED RING SENSOR TIP Automotive Technology Fifth Edition P ALWAYS LEARNING gy James Halderman EARSON h
6. ad WOR ABS DIAGNOSIS AND SERVICE Lj B i Figure 107 14 a Always use a nonferrous brass or plastic feeler thickness gauge when measuring the gap between the toothed ring and the wheel speed sensor MEASURE WITH NONFERROUS FEELER GAUGE SPEED SENSOR gt TOOTHED RING a Automotive Technology Fifth Edition P ALWAYS LEARNING gy James Halderman EARSON rr my ABS DIAGNOSIS AND SERVICE Figure 107 14 b Sometimes a sensor is equipped with a paper spacer that is the exact thickness of the spacing required between the toothed ring and the sensor If equipped the sensor is simply installed with the paper touching the toothed wheel A typical gap ranges from 0 020 to 0 050 in 0 5 to 1 3 mm J WHEEL SPEED SENSOR Automotive James Hald hnology Fifth Edition in PEARSON ALWAYS LEARNING my ABS DIAGNOSIS AND SERVICE TECH TIP a PA arence in outside ALWAYS LEARNING e 10tiv An y Fifth Edition PEARSON rr my ABS DIAGNOSIS AND SERVICE P er CHART 107 1 Um Len Peer Wher Deest rss Bitten he OAM ay emet ren went Lr Metter UMP patrare pena pelirrrrybni e Multa tes ma SEM Dene dan Chun wm jnas omm hapert Penn UK Gente tota rmt dum 111744 CH Regn Peo Mpe yent Sores Covet fani Partrrmans URIA EDOM Igy larut noza CU CCN Het Derzsi COOL UA Poo Ment Tyr Corp Wilkami IMG Pary Meme Creat Ope rune COME ot
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9. le wee vf in armi if fer come w ager pa acm m m o n LL ss ea a tates Wie md am sei nas me DTO i De ate e tows Fue patani c9 tiith apeett ead P ad bue n 4 e I ITI o Hu om Www tt m n ee ww ole ihe t ss 4 iee be Nji ma ree Um t itm pci ow w Tt ue cn dos n e m 110 ctn ooo i me m dres of me tome etum d I pes patei peage 07h ALWAYS LEARNING XZ utomotive James Hald echnology Fifth Edition nan DT PEARSON TY WF ABS DIAGNOSIS AND SERVICE Ly E Figure 107 8 A breakout box is being used to diagnose an ABS problem The controller computer is located in the trunk of this vehicle and a digital multimeter is being used to measure resistance and voltage at various points in the system following the service manual procedure ALWAYS LEARNING a 10tiv i y Fifth Edition PEARSON rr I ABS DIAGNOSIS AND SERVICE TESCH TI ALWAYS LEARNING is 10tiv a y Fifth Edition PEARSON had WOR ABS DIAGNOSIS AND SERVICE Figure 107 9 Typical wheel speed sensor When a tooth on the sensor ring is close to the sensor the _ strength of the magnetic field is stronger because the metal of the tooth conducts magnetic lines of force better than air When the tooth moves away the magnetic field strength is reduced It is this changing magnetic field strength that produces the changing voltage Frequency of the signal
10. orough visual inspection revemiod mat the lone wheel Gareer ring was cracked Thm onmek ereuted a dierent wheel speed signal to the ABS controller than the athar wheem and the controller activated the ABS ss it wauki mormolly that was why thoru were no DTCs Other thang That could heave conse thee prenilem which is often called ialus rmodutation include a bont wheel mnmatched fire azes or metal debes arnurd the sensor bo Automotive Technology Fifth Edition P ALWAYS LEARNING gy James Halderman EARSON bd WF ABS DIAGNOSIS AND SERVICE b Figure 107 6 A scan tool is the recommended method to use to access General Motors Teves Mark IV systems Automotive Technology Fifth Edition P ALWAYS LEARNING gy James Halderman EARSON rr ey ABS DIAGNOSIS AND SERVICE a t j a Figure 107 7 The Delphi Delco VI attaches to the side of the master cylinder and connects hydraulically through transfer tube assemblies MASTER ind CYONDER i LF RF SOLENOID SOLENOID VALVE VALVE Lr MOCULATION d MOOULATION PsTON ith PISTON MONT LEFT REAN REAN ALWAYS LEARNING 4Utomotive Technology Fifth Edition P E A RS N James Halderman rr my ABS DIAGNOSIS AND SERVICE Tre Hyer AUS Anime Wereg batt Joe ca iP an nira ort arid a og leoo Mere gar u Ve et aant rm eat T Ww i anh Ant any DI Ph y apiy dup AUS y fom num ofl Hm ig eun ano e Fe yra I AN stom te
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