Honda Bmw 5 Service Manual
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Fuel lniection 1 Table b. Siemens MS 41.1 ECM pin assignments (continued) Pin lSiqnal 1 Componentlfunction / Notes I - I I 40 1 ground /Crankshaft position sensor /crankshaft position sensor control I - I I 41 1 ground /Camshaft position sensor (CMP) /shielding for CMP sensor I - I I 42 1 ground I~hrottie position sensor (TPS) /TPS ground 43 44 45 46 47 48 49 50 51 ground output output output outout I I I input 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 Camshaft position sensor (CMP) Throttle position sensor (TPS) Throttle position sensor (traction control) Instrument cluster Not used Crankshaft position sensor (Hall effect) I~ot used I I I Fuel pump relay control Camshaft positionlrpm sensor control Voltage supply to TPS (5 vdc) ABSIASC module Instrument cluster, fuel reserve signal Crankshaft position sensor control Power supply (terminal 15) Not used Not used output input ground ground output input output inputloutput ground output input input input I I Battery voltage with key on or engine running Oxygen sensor signal ground 67 Idle speed control valve Power supply Oxygen sensor heater (no. 2 in front catalytic converter) Ignition circuit Knock sensor (cyl. 1-3) Knock sensor (cyl. 1-3) Knock sensor (cyl4-6) Data linic connector (TxD) Oxygen sensor heater (no. 2 behind catalytic converter) Secondary air injection Knock sensor (cyl. 4-6) Camshaft positionlrpm sensor Camshaft positionlrpm sensor Not used Pulse ground with engine at normal temperature with varying engine load 68 Pulsed ground-close signal (see pin 26) Battery voltage from main relay (terminal 87) Oxygen sensor heater ground Ignition circuit monitoring signal Knock sensor Knock sensor signal Knock sensor Diagnostic TxD (transmit) signal to pin 18 in data link connector Oxygen sensor heater ground Secondary air injection control valve Knocic sensor signal Camshaft positionlrpm sensor control Camshaft positionlrpm sensor control ground Oxygen sensor (no. 1 in front of catalytic converter) output Evaporative purge valve control
/Fuel injection Table b. Siemens MS 41.1 ECM pin assignments (continued) 85 86 87 88 CAN-Bus low CAN-Bus high Power supply Diagnostic connector (TxD) inputloutput inpuWoutput input input output Automatic transmission control module (AGS) Automatic transmission control module (AGS) Battery voltage from main relay terminal 87 Diagnostic TxD signal to pin 17 in data link connector
- -. Fuel Injection SIEMENS MIS 42.0 AND 43.0 When system faults are detected, a diagnostic trouble code (DTC) is stored in the engine control module (ECM). The MIL also illuminates if an emissions-related fault is detected. When faults arise, or if the malfunction indicator lamp (MIL) is illuminated, begin troubleshooting by connecting BMW ser- vice tester DISplus, MoDiC, GTI or equivalent scan tool. The capabilities of OBD II software has the potential to save hours of diagnostic time and to help avoid incorrect component re- placement and possible damage to system components. CAUTION- * The tests in this section may set fault codes (DTCs) in tlie ECM and illuminate the MIL. After all testing is completed, access and clear DTC fault memory using an OBD I/ or BMW compatible scan tool. See OBD On-Board Diag- nostics. Only use a dgital multimeter for electrical tests. Relay positions can vary. Be sure to confirm relayposi- tion by identifying the wiring in the socket using the wir- ing diagrams found in ELE Electrical Wiring Diagrams. NOTE- - OBD I1 fault memory. (including an illuminated MIL! can only be reset using the special scan tool. Removing the connector from the ECM or disconnecting the battery will not erase the fault memory. The BMW-dedicated 20-pin diagnostic linlc connector (DLC) is in the right rear of the engine compartment The 20-pin DLC is discontinued on models after 6/2000. The 1 &pin OBD I1 diagnostic connector (arrow) is located inside the car on the lower left dash panel. The MS 42.0 and MS 43.0 systems manage the following functions. - Air: Idle speed valve Electronic throttle Hot film mass air flow (MAF) sensor Resonance-turbulence intake control - Fuel: * Fuel supply Running losseslnon return Fuel injection
Fuel Injection - Ignition: Direct ignition Knock control 4 Primary1 secondary ignition monitoring - Emissions: OBD II compliance Secondary air injection Pre- and post-catalyst oxygen sensors 0 Electrically heated DME-mapped thermostat Misfire detection Evaporative emission control and leak detection Malfunction indicator light (MIL) Performance controls: Dual VANOS control Output of injection signal (TI) for fuel economy gauge Output of engine rpm (TD) for tachometer AIC compressor control 0 Electric radiator cooling fan CAN-Bus communication Stability and traction system (ABSIASCIDSC) interlace Electronic immobilizer (EWS) Cruise control ECM programming
130-25 Fuel injection CONTROL RESONANCE. TURBULENCE ----, VALVE CRANUSHAFT SECONDARY AIR MULTI-FUNCTION ROLLING CODE
130-26 Fuel Injection Resonance- turbulence 0021664
- Fuel Injection ECM relay, testing The engine control module (ECM) relay is energized via the ECM and supplies battery positive (Bc) power to many of the engine management components and subsystems. If this re- lay is faulty, the engine will not start. NOTE- The ECM relay is also referred to as the DME main relay ECM relay powers: ECM Ignition coils * Fuel injection Evaporative leak detection pump Idle air actuator - Camshaft sensors Evaporative emissions valve Hot film mass air flow sensor Fuel pump relay Oxygen sensor heaters 4 Working in right rear of engine compartment: Release interior ventilation filter cover latch (A) and re- move cover. Release plastic locking tab (B). Rotate duct inward (arrow) to unlock from bulk head and remove duct. Release spring lock (C) to remove lower filter housing. Slide filter housing away from inner fender to remove. - Remove electrical box (E-box) cover fasteners and remove cover. With ignition off, remove ECM relay (arrow) in electronics box (E-box) at rear of engine compartment, right side. NOTE- Relay locations can vary Confirm relay identification by matching wiring colors and terminal numbers.
130-28 Fuel Injection ECM Relay 4 Check for voltage at terminal 6 (30) at reiay socket If battery voltage is present continue testing. if battery voltage is not present, check fuse 109 (80-amp fusible link) under passenger seat carpet. See 610 Electri- cal Component Locations. - Reinstall relay and turn ignition on. Gain access to back side of reiay socket and check for ground at terminal 4. If ground is present continue testing. If ground is not present, signal from ECM is missing. Check wire between ECM and relay. - With ignition on and reiay installed, check lor battery voltage at terminal 2. If battery voltage is present, relay has energized and is functioning correctly. If battery voltage is not present and ail earlier tests are OK, relay is faulty and should be replaced. NOTE- If no faults are found during testing but power is not reaching the ECM or other components, check the fuses in the fuse carrier X8680 in the E-box. Mass air flow (MAF) sensor, checking and replacing 4 The hot f~lm mass air flow (MAF) sensor sends a varying volt- age (approx. 0.5 - 4.5 vdc) to the ECM representing the mea- sured Intake air. The alr mass input signal is produced electron~caily uslng an electrically heated metal fllm in the air flow stream. The ECM relay provides the operating voltage to the MAF sensor. As air flows through the sensor, the film is cooled. To maintain the film at a constant temperature, additional current is necessary. It is this additional current that is the basis lor the input signal. If there is no output signal from the MAF sensor, the ECM op- erates the engine using the throttle position and engine rpm inputs. A faulty MAF sensor illuminates the MIL.
Fuel Injection A faulty MAF sensor can produce the following problems: Difficult to restart when engine is hot Engine starts then stalls * Engine starts and runs only with accelerator pedal de- pressed 4 Disconnect electrical harness connector from MAF sensor (B). - Turn ignition on and checlc for voltage and ground at connec- tor. There should be ground at pin 1 and battery voltage at pin 3. - If any faults are found, checlc for wiring breaks between MAF sensor and ECM and between MAF sensor and main DME relay. NOTE- Visually inspect the sensor for damage, missing or blocked screens. The screens affect air flow calibration. Also inspect the sealina 0-rinas where the sensor inserts into the air filter - - housing and intake boot. Ensure the pin connections are clean and tight. 4 Connect a BMW-compatible scan tool or an OED II generic scan tool. Checlc air mass signal (load signal) with the engine at idle. Raise idle speed and checlc that load signal changes with rpm. CAUTION- Be sure ignition is OFFbefore disconnecting or reconnecting DME system components. Remove MAF sensor: Loosen intake boot clamp (A). Disconnect harness connector (6). * Release clip from air filter housing (C) and remove sensor. - Installation is reverse of removal. No adjustment to MAF sensor is possible. Check intake hoses for cracks and vacuum lealts.
Fuel Injection Engine coolant temperature (ECT) sensor, testing and replacing 4 The ECT sensor is located below cylinder 6 intake port at the rear of the engine (1). The ECT sensor is a dual temperature sensor. One circuit provides coolant temperature information to the ECM while the other circuit provides coolant temperature information to the instrument cluster. The ECM determines the correct ignition timing and airlfuel mixture required forthe engine temperature by monitoring an appliedvoltage (5vdc) to the sensor.Thevoltage drop across the sensor varies as the coolant temperature (sensor resis- tance) changes. NOTE- The ECT sensor is an NTC (negative temperature coeffi- cient) type sensor. In other words, as the temperature rises, resistance through the sensor decreases. If the ETC sensor input is faulty or non-plausible, the MIL is il- luminated when the MIL is illuminated when OED II fault crite- ria are exceeded. The ECM assumes a substitute value (80 C 11 76F) to maintain engine operation. The ignition tim- ing is set to a conservativelsafe basic setting. - Remove intake manifold to access ECT sensor on the M52 TU and the M54 engines. See 113 Cylinder Head Removal and Installation. - Check ECT sensor resistance using a multimeter at sensor terminals. WARNING - Due to rislc of personal injury, be sure the engine is cold be- fore removing ECT sensor connector. ECT sensor resistance @ 20°C (68°F) CAUTIOI\C Be sure ignition is OFFbefore disconnecting or reconnecting DME svstem components. 2.2 - 2.7 k 4 Disconnect ECT sensor harness connector (arrow). Un- screw ECT sensor from cylinder head.