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Draper M111 manual

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Table of contents for the manual

  • Page 1

    Lotus Service Notes Section EMN Page 1 ENGINE MANAGEMENT & FUEL INJECTION SECTION EMN - M1 1 1 ELISE Section Page Introduction & Component Location EMN.1 3 'Lotus Check' Scanner T ool EMN.2 4 Throttle Cable Adjustment EMN.3 7 Electronic Control Module (ECM) EMN.4 7 Relay Module EMN.5 8 Manifold Absolute Pressure (MAP) Sensor EMN.6[...]

  • Page 2

    Lotus Service Notes Section EMN Page 2 COMPONENT LOCA TION DIAGRAM em196[...]

  • Page 3

    Lotus Service Notes Section EMN Page 3 EMN.1 - INTRODUCTION Key to Component Location Diagram 1. Fuel pump 14. Cam angle sensor (VVC only) 2. Engine coolant temperature (ECT) sensor 15. Idle air control (IAC) valve 3. W ater temperature gauge sender (vertical) 16. Throttle postion (TP) sensor 4. Crankshaft position sensor 17. Throttle body 5. Oxyge[...]

  • Page 4

    Lotus Service Notes Section EMN Page 4 paired with 4, and 2 with 3), the sp ark in the cylinder on the exhaust stroke being 'wasted'. The twin coil pa ck is mounted on the cylinder block as for standard engines. On VVC engines, the variable valve control mechanism is also controlled by the ECM. T wo solenoid valves attached to the hydraul[...]

  • Page 5

    Lotus Service Notes Section EMN Page 5 T o Connect 'Lotus Check' T o connect the equipment, proceed as follows: i) . Plug the power harness into the scanner tool and the printer; ii). Insert the MEMS 1.9 (standard engine) or MEMS 2J (VVC engine) programme card into the scanner tool slot, label uppermost. iii). Open the front and rear comp[...]

  • Page 6

    Lotus Service Notes Section EMN Page 6 test. Run a further test to verify the repair . Prog The 'programme' menu is available only on the MEMS 2J card, and allows matching of the engine management and security 5AS modules if one or the other is replaced. At the instant of ignition is switch on, the security 5AS module sends a unique coded[...]

  • Page 7

    Lotus Service Notes Section EMN Page 7 EMN.3 - THROTTLE CABLE ADJUSTMENT Before adjusting the cable, first check that the pedal end of the cable is correctly located, and that the cable is correctly routed with no sharp bends or entrapment. Do not attempt to adjust the throttle cable or idle speed by means of the stop screw on the throttle body , w[...]

  • Page 8

    Lotus Service Notes Section EMN Page 8 Before removing an ECM, first disconnect the battery earth lead before pressing the retaining barb and unplugging the harness connector(s). On standard cars, the MAP sensor is contained within the ECM body , with the sensor hose connecting to a spigot on the underside of the unit. On pre 'boot box' c[...]

  • Page 9

    Lotus Service Notes Section EMN Page 9 MN.6 - MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR The MAP signal is fundament al to the calculation of air consumption and fuel calibration. The ECM provides a 5 volt supply and earth path to the sensor , which returns a voltage representing the manifold pressure. On standard engines, the MAP sensor is contained [...]

  • Page 10

    Lotus Service Notes Section EMN Page 10 EMN.7 - CRANKSHAFT POSITION SENSOR The signals provided by the crankshaft position sensor enable the ECM to determine: - engine speed; - crankshaft position. The inductive type sensor is mounted by a single fixing into a flange at the right hand rear of the cylinder block, where it protrudes towards reluctor [...]

  • Page 11

    Lotus Service Notes Section EMN Page 11 EMN.8 - ENGINE COOLANT TEMPERA TURE (ECT) SENSOR The ECM requires a coolant temperature input signal in order to increase fuel delivery and maintain driveability during the cold running and warm-up phase. The signal from this sensor is used for many different parameters within the engine management system to [...]

  • Page 12

    Lotus Service Notes Section EMN Page 12 EMN.9 - INT AKE AIR TEMPERA TURE (IA T) SENSOR The intake air temperature (IA T) sensor is fitted into the inlet manifold tract of no.4 cylinder , and is a transducer with a negative temperature coef ficient, such that its electrical resist ance reduces with increasing temperature. Using this signal in conjun[...]

  • Page 13

    Lotus Service Notes Section EMN Page 13 EMN.10 - THROTTLE POSITION (TP) SENSOR The throttle position (TP) sensor is a potentiometer fitted directly to the end of the throttle spindle, and provides the ECM with information on both throttle opening, and rate of change of throttle opening. For example, when a fully closed throttle and appropriate engi[...]

  • Page 14

    Lotus Service Notes Section EMN Page 14 EMN.1 1 - IDLE AIR CONTROL (IAC) V AL VE The idle air control (IAC) valve is mounted on the intake plenum, and controls an air p assage which by- passes the throttle valve. When the pintle of the valve is fully extended, the p assage is closed off for a minimum idle speed, but as the ECM commands the IAC step[...]

  • Page 15

    Lotus Service Notes Section EMN Page 15 EMN.12 - OXYGEN (O 2 ) SENSOR The MEMS system operates a 'closed loop' fuel control system whereby the output signal from an oxygen sensor in the exhaust system is monitored by the ECM, which constantly adjust s the air/fuel ratio to that providing the most efficient conversion of gases by the cat a[...]

  • Page 16

    Lotus Service Notes Section EMN Page 16 EMN.13 - CAMSHAFT POSITION SENSOR (VVC versions only) The camshaf t position sensor has two functions: i) to provide an engine position reference for the sequen- tial injection; ii) to measure the actual inlet cam period as controlled by the VVC mechanism. The inductive type sensor is mounted on the right han[...]

  • Page 17

    Lotus Service Notes Section EMN Page 17 EMN.14 - VVC MECHANISM CONTROL SOLENOIDS The inlet cam period is determined by a hydraulic control unit (HCU) mounted on the right hand front of the cylinder head. The HCU uses two solenoids to operate a spool valve and control a piston and rack mechanism, which outputs from the HCU via a control shaf t to th[...]

  • Page 18

    Lotus Service Notes Section EMN Page 18 EMN.15 - OIL TEMPERA TURE SENSOR An oil temperature sensor is mounted in the top of the VVC hydraulic control unit. The oil temperature is used by the ECM to determine how quickly the VVC mechanism will respond to cam period change com- mands. T o replace the sensor , unplug the electrical connector (brown), [...]

  • Page 19

    Lotus Service Notes Section EMN Page 19 EMN.16 - FUEL SYSTEM The fuel system is a high pressure recirculating type, using an 'in tank' submerged 3-st age impeller pump, an in line canister filter , a common fuel rail supplying all four injectors, and a fuel pressure regulating valve controlling the return line to the tank. W ARNING: The f[...]

  • Page 20

    Lotus Service Notes Section EMN Page 20 Fuel Pump Switching The fuel pump is controlled by the ECM via the fuel pump relay located in the relay module, and is energised under the following conditions: . When the ignition is first switched on, the ECM grounds the pump relay coil for a few seconds in order to pressurise the fuel rail, and then switch[...]

  • Page 21

    Lotus Service Notes Section EMN Page 21 function of the regulator is to maintain a const ant pressure dif ferential across the injectors at all times. i.e. a constant dif ference between fuel pressure supplied to the injector , and inlet manifold pressure at the port injector nozzle. By using an intake plenum pressure signal to supplement regulator[...]

  • Page 22

    Lotus Service Notes Section EMN Page 22 Push Fit Connectors The fuel rail feed and return hoses are equipped with push fit connectors to allow easy powertrain re- moval. The feed line connector is colour coded orange, and the return line connector green. Note that the feed line should not be opened without first carrying out the fuel pressure relie[...]

  • Page 23

    Lotus Service Notes Section EMN Page 23 Fuel Rail and Pressure Regulator V alve - Replacement Do not attempt to remove the pressure regulator valve from the fuel rail; The valve is supplied only as an assembly with the rail. The fuel rail is removed from the engine complete with the four fuel injectors. 1. De-pressurise the fuel system, and disconn[...]

  • Page 24

    Lotus Service Notes Section EMN Page 24 8. T o remove an injector from the rail, unplug the harness connector , remove the clip, and withdraw the injector from the rail. Discard the two 'O' rings. 9. Before re-fitting the injectors and rail, clean the injector recesses in the rail and inlet manifold, and fit each injector with 2 new &apos[...]

  • Page 25

    Lotus Service Notes Section EMN Page 25 Distributor A rotor arm is mounted on a 'D' shaped extension to the rear end of the inlet camshaft, and is ret ained by a patchlock screw . Always replace the screw , or retreat with Loctite 242. The rotor arm incorporates a sup- pressor and has a resistance value of 1.25 kohms. The distributor cap [...]