Basic Engine Settings 2. Check that the battery isin good condition. Check that the cables are tight and free of corrosion at both ends. The adaptive engine management system is de- ed and in good condition. Once these limits are exceeded, driveability problems usually 3. Check for prwer and ground at the Engine Control become noticeable. Module ECM. Check the main grounds for the ECM. Check the fuses. Check for sufficient fuel in the tank. If gine light will come on, indicating an emission related the engine ranout of fuel, it will take a little time to re- fault.
See Fuel Injection, store fuel pressure. See Fuel Tank and Fuel Pump. Oxygen Sensors 5. Check for spark at the spark plugs. If the tachometer needle bounces while the engine is crankedby the A high oxygen level in the engine exhaust indicates a lean starter then the ignition system is probably working cor- air-fuel mixture and a low oxygen level indicates a rich mix rectly.
See Ignition System. The oxygen sensor, shown in Fig. Check for any faults through the On-Board Diagnostics voltage signal. Using that feedback signal asan input, the system. DME control module fine tunes the air-fuel mixture. Therefore, The primary input usedby the fuel injection system to deter- when troubleshooting cold engine driveability prob- mine how much fuel should be delivered is the signal from the lems, the oxygensensor canbe ruled out asa possible mass air flow sensor in the intake air ductwork.
As the oxygen sensor ages, its ability to react quickly to changing conditions deteriorates, and it may eventually cease to produce any signal at all. To check the operation of the oxy- gen sensor, see Fuel Injection : NOTE- On and latercars, OBD 11 enhanced emission standards require the engine control module ECM to monitor the oxygen content in the exhaust both before and after the catalytic converter.
Thisallows for tighter control of the tail pipe emissions and also allowsthe ECM to diagnose converter problems. If the DME de- tects that catalytic converter or oxygensensor efficien- cyhas degraded pasta certain pre-programmed limit, it will turn on the Check Engine light, and store a diag- nostic trouble code DTC in the ECM. NOTE- Fig. Regulating oxygen sensor measures oxygen content of ex- gattery Voltage hausY gas as indicator of.
There are many places for unmeasured air to enter theen- gine. First, inspect all hoses, fittings, ducts, seals, and gaskets in the intake air tract for cracks or looseness. It may be neces- sary to remove parts that cannot be fully checked in their in- stalled positions. Also make sure all of the intake manifold and throttle body mounting nuts are tight. In addition to air leaks, air restrictions can also cause drive- ability problems. Remove the air filter and hold it up to a strong light source.
If the filter does not pass light, it is restricted and should be replaced. Also, remove the intake air ductwork and check for oily deposits at the throttle plate. Buildup in this area can cause an erratic idle. Clean away any deposits using a cloth wetted withcarburetor cleaner and reinstall the ductwork. Spraying cleaner may force it into the throt- tle position switch or sensor and cause damage. All of the electrical components in the fuelinjection and igni- tion systems require a minimum voltage to operate properly.
When troubleshooting engine driveability problems, one of Replacement of oxygensensors at the specified intenrals en- the first checks should be to make sure the battery is fully sures that the engine and emission control system wili continue charged and capable of delivering allits power to the electricalto operate as designed. As the oxygen sensor ages, its ability to system.
To make a quick check of battery charge, measure the volt- age across the battery terminals with all cables attached and As the oxygen sensor ages, its ability to react quickly to the ignition off. Lubrication System — Bmw M3 Adobe Acrobat Document 1. Ignition System — Bmw M3 Adobe Acrobat Document 1' Battery, Starter, Alternator — Bmw M3 Fuel Injection — Bmw M3 Adobe Acrobat Document 5.
Fuel Tank and Pump — Bmw M3 Radiator and Cooling System — Bmw M3 Adobe Acrobat Document 2. Exhaust System — Bmw M3 Adobe Acrobat Document BMW E36 Transmission.
It only shows it in the driver's side kick panel and says 1. Comfort relay where applicable. According to the wiring diagram, there is a comfort relay suppling Fuse 1 with power - but BMW have hidden it well because it's not behind the dash like the manuals say it is. E36 — Service Manual. E46 — Service Manual. E90 — Service Manual. E91 — Service Manual. E92 — Service Manual. E34 — Service Manual. E39 — Service Manual.
E60 — Service Manual. E61 — Service Manual. E53 — Service Manual. E70 — Service Manual. E83 — Service Manual. Wiring diagrams include location information, wiring, pin identification, troubleshooting, maintenance, function descriptions, and more. This includes all information that follows wiring and wire connections.
Rhys Williams Thursday, 13 January
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