Honda Bmw 5 Service Manual
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ignition System Crankshaft speed sensor, replacing (M62 and M62TU engines) The crankshaft speed sensor reads a toothed pulse wheel mounted on the flywheel. If the Engine Control Module(ECM) does not receive an impulse signal from the crankshaft speed sensor during cranking, the engine will not start. If the OBD II system misfire detection protocol detects a catalyst damag- ing fault due to a malfunction in the crankshaft speed sensor components, the Check Engine light (Malfunction Indicator Light or MIL) will be Illuminated. 4 The crankshaft speed sensor (arrow) is mounted in the right lower side of the bell housing. - Remove speed sensor by disconnecting electrical harness connector and unbolting sensor from bell housing. Do not discard shims, if present. - Installation is the reverse of removal. Clean mounting surface before installing new sensor, and install shims, if present. < If the flywheel was replaced, the speed sensor must be checked for correct installation depth. * Crank engine in direction of rotation using crankshaft bolt until a full pulse tooth is centered in the opening for the re- moved speed sensor. Measure depth ro top of tooth from speed sensor p~lse generator mounting s~rface on transmission. 4 Measure length of pulse generator from mounting surface to end (A). - Subtract length of pulse generator (A) from distance to pulse tooth from mounting area on transmission. This measure- ment is the gap between the pulse sensor and flywheel. Use shims available from BMW to increase gap as needed to reach specification. Pulse sensor gap End of sensor to flywheel teeth 0.55 + 0.2 rnrn (0.0217 t 0.008 in)
I Ignition System Camshaft position sensors The camshaft position sensors are used by the englne man- agement system for VANOS control, sequential fuel injection and knock control. Intake camshaft position sensor, replacing (M52,M52 TU and M54 engines) - Make certain ignition has been turned off. - Remove plastic cover from above fuel injectors by prying off bolt covers and removing cover mounting bolts. Remove complete air filter housing: Disconnect electrical harness connector on mass air flow sensor (A). Detach vacuum line at intake boot (B). Loosen hose clamp at intake boot and detach air duct con- nections (C). * Disconnect cold air duct tube (D). Remove filter housing mounting screws (E). - Disconnect harness connector from VANOS solenoid and unscrew solenoid from VANOS control unit. Be prepared with shop rags to catch oil released from VANOS unit. Remove camshaft sensor (arrow) from left front of cyl~nder head, next to top of oil filter housing. Disconnect camshaft sensor harness from under intake manifold. Prior to removal, attach a stiff piece of wire to the harness connector end to preserve proper routing of harness for reinstallation. Installation is reverse of removal, noting the following: Use new O-rings when installing sensor and solenoid. Be sure wiring is rerouted in same orientation. Use scan tool to read out and clear ECM fault memory Tightening torques - Intake camshaft sensor to cylinder head 10 Nrn (7 ft-lb) VANOS solenoid to VANOS control unit 30 Nm (22 ft-lb)
120-15 Ignition system1 Exhaust camshaft position sensor, replacing (M52 TU and M54 engines) - Make sure ignition has been turned off. 4 Working at front of engine on exhaust (right) side, detach ex- haust camshaft position sensor electrical harness connector (arrow) and remove sensor. - Installation is reverse of removal, noting the following: Use a new O-ring when installing sensor. - Use scan tool to read out and clear ECM fault memory. Tightening torque Exhaust camshaft sensor to cylinder head 10 Nm (7 ft-lb) Intake camshaft position sensor, replacing (M62 and M62 TU engines) - Make sure ignition has been turned off 4 Remove top engine cover by releasing quick release fasten- ers (arrows) by pressing down. 4 Remove air filter housing and mass air flow sensor: Disconnect mass air flow sensor and intalte air tempera- ture sensor electrical harnesses (A and B). Remove air filter housing mounting fastener (arrow). Loosen hose clamps (C and D). Remove hose at idle air stabilizer. Remove air filter housing with mass air flow sensor. - Remove intalte hose from throttle body.
120-1 6 Ignition System Remove camshaft sensor (arrow) from front of right cylinder head. Disconnect camshaft sensor harness from cable duct above right cylinder head. Installation is reverse of removal, noting the following: Use new O-ring when installing sensor. Be sure wiring is rerouted in same orientation. Use scan tool to read out and clear ECM fault memory. Tightening torque Intake camshaft sensor to timing chain 5 Nm (3.5 ft-lb) cover Knock sensors Knock sensors, replacing (M52, M52 TU and M54 engines) The knock sensors are bolted to the left side of the cylinder block under the intake manifold. - Remove intalte manifold as described in 113 Cylinder Head Removal and Installation. D~sconnect knock sensor electrical harness connector (A) on left side of engine cylinder block. Remove knock sensor mount~ng bolts (arrows) on side of cyllnder block. Remove sensors. Note the installed angle of the lnocl~ sensor on the bloc/( be- fore removing it. Reinstall the sensor in the same position. Be sure to use a torque wrench when tightening the sensor mounting bolt. < Clean lknock sensor contact surface on engine bloclc and sensor (arrows) before installing ltnock sensor. Tightening torque Knock sensor to head 20 Nm (15 ft-lb) - Use scan tool to read out and clear ECM fault memory. Knock sensors, replacing (M62 and M62 TU engines) The knock sensors are bolted to the side of the cylinder block under the intake manifold.
Ignition System Remove intake manifold as described in 113 Cylinder Head Remaval and Installation. Remove knock sensor mounting bolts (arrows) on side of cylinder block. Remove sensors. I CAUTION- I Note the installedangle of the knock sensors on the bloclt be- fore removalit. Reinstall the sensors in the same position. Be sure to use a torque wrench when tightening the sensor mounting bolts. Clean lknoclc sensor contact surfaces on engine bloclc and sensors before installing. Tightening torque Knock sensor to engine bloclc 20 Nm (15 ft-lb) - Use scan tool to read out and clear ECM fault memory. - Installation is reverse of removal.
121-1 121 Battery. Starter. Alternator General ........................... .I2 1.2 Special tools ........................ .I2 1.2 Engine electrical system ............... .I2 1.2 Battery Safety Terminal ............... .I2 1.3 Warnings and cautions ................. 121 -4 Battery ............................ 121-5 Battery testing ...................... .I2 1.5 Hydrometer testing ................... .I2 1.5 Battery open-circuit voltage test ......... .I2 1.6 Battery load voltage test ................ 121 -6 Closed-circuit current measurement ..... .I2 1.7 Battery charging ...................... 121 -9 Battery safety terminal, replacing ......... 121-9 Alternator (generator) ............. .I2 1.10 Alternator. basic .................... .I2 1.11 Alternator with multi-function control (MFR) ...................... .I2 1.11 Water-cooled alternator ............... 121 -12 Charging System Troubleshooting . 121-12 Charging system quick-check .......... 121-13 Charging system. checking ............ 121-13 Alternator. removing and installing (6-cylinder engine) .................. 121 -1 5 Alternator. removing and installing (M62 engine. air cooled) .............. 121-16 Alternator. removing and installing (M62 TU engine. water cooled) ......... 121-1 8 Starter ........................... 121 -1 9 Starter troubleshooting ............... 121 -1 9 Starter. removing and installing (6-cylinder engine) .................. 121-20 Starter. removing and installing (V-8 engine) ........................ 121 -21 Solenoid switch. removing and installing . . 121-23
- - Battery, Starter, Alternator This section covers the battery, alternator, starter and associ- ated components of the electrical system. Troubleshooting information forthese components isfound in Table a. Battery, alternator and starter troubleshooting. For additional electrical troubleshooting information, see 600 Electrical System-General. Special tools 4 Automotive digital multimeter CAUTION- Only use a digital multirneter when testing automotive electri- I) cal components. 4 Closed-circuit current measurement adaptor (Tool No. BMW 61 2 300) Engine electrical system The alternator and starter are wired directly to the battery. To prevent accidental shorts that might blow a fuse or damage wires and electrical components, always disconnect the negative (-) battery cable before working on the electrical system. Various versions of alternators, voltage regulators, starters, and batteries are used in E39 cars. Replace components ac- cording to the original equipment specification.
Battery, Starter, ~lternatorl @ TO fuse & relay panel Battery Safety Terminal A Battery Safety Terminal (BST) controlled by the Multiple Restraint System (MRS) control unit was introduced for mod- el year 1998 vehicles. The system will disconnect electrical power to the engine compartment in the event of a significant impact. The MRS system fires an encapsulated pyrotechnic device in the positive (+) battery terminal that disconnects power to the engine compartment, but maintains power to the exterior lights and interior of the vehicle. point 002125~1 Table a. Battery, alternator and starter troubleshooting 1- /Starter motor or solenoid faulty. l~est starter. Symptom Engine does not crank Engine cranks slowly or not at all, solenoid clicits when starter is operated. I I Battery will not stay IShort circuit draining battery. l~est for excessive current drain with everything Probable cause Fault in immobilizer system (EWS) -Clean Battery cables loose, dirty or corroded. Battery discharged. Battery to body ground cable in trunk loose, dirty or corroded Poor connection at starter motor terminal 30. Corrective action Try another ignition key. If problem persists, contact your authorized BMW dealer. or replace cables. See 020 ~aintenance. Charge battery and test. Replace if necessary. inspect ground cable. Clean, tighten or replace if necessary. Checlc connections, test for voltage at starter. Test for voltage at neutral safety or clutch interloclc switch. charged more than a few days. I~atter~ faulty. /Test battery and replace if necessary. Short driving trips and high electrical drain on charging system does not allow battery to recharge. . I I Battery cables loose, dirty or corroded. Iclean or replace cables. See 020 Maintenance. Evaluate driving style. Where possible, reduce electrical consumption when malting short trips. Drive belt@) loose, worn or damaged. IAlternator or voltage regulator faulty. /Test alternator and voltage regulator. Inspect or replace ribbed belt@). See 020 Maintenance.
.-. . Battery, Starter, Alternator Warnings and cautions WARNING - Wear goggles, rubber gloves, and a rubber apron when working around the battery or battery acid (electrolyte). Battery acid contains sulfuric acid and can cause skin irritation and burning. If acid is spilled on your skin or clothing, flush the area at once with large quantities of water. If electrolyte gets into your eyes, flush them with large quantities of clean water for several minutes and call a physician. Batteries that are being charged or are fully charged give off explosive hydrogen gas. Keep sparks and open flames away. Do not smoke. CA UTIOI\C Only use a digital multimeter when testing automotive elec- trical components. . If a repair procedure specifies disconnecting the bat- tery, follow the instruction for safety reasons. Prior to disconnecting the battery, read the battery dis- connection cautions in 001 General Cautions and Warnings. Models with MS43 engine management: Allow at least 3 minutes to elapse after turning ignition ley to OFFpo- sition before disconnecting battery. This willallow sum- cient tinie to complete the DMJL (fuel tank pressure) test * Disconnecting the battery cables may erase fault codes stored in ECM memory. Always disconnect the negative (-) battery cable first and reconnect it last. Cover the battery post with an in- sulating material whenever the cable is removed. Do not disconnect battery, alternator or starter wires while the engine is running. 0 Never reverse the battery cables. Even a momentary wrong connection can damage the alternator or other electrical components. Do not depend on the color of insulation to tell battery positive and negative cables apart. Label cables before removing. The slide-tilt sunroof may fail to function properly after disconnecting and reconnecting the battery. Reinitial- ize sunroof as described in 540 Sunroof.