Page 2 - Lotus Service Notes Section EMN; COMPONENT LOCATION DIAGRAM
Lotus Service Notes Section EMN Page 2 COMPONENT LOCATION DIAGRAM em196
Page 3 - After start enrichment
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. Water temperature gauge sender (vertical) 16. Throttle postion (TP) sensor 4. Cran...
Page 4 - is mounted on the cylinder block as for standard engines.
Lotus Service Notes Section EMN Page 4 paired with 4, and 2 with 3), the spark in the cylinder on the exhaust stroke being 'wasted'. The twin coil pack is mounted on the cylinder block as for standard engines. On VVC engines, the variable valve control mechanism is also controlled by the ECM. Two so...
Page 5 - To connect the equipment, proceed as follows:
Lotus Service Notes Section EMN Page 5 To Connect 'Lotus Check' To 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 uppermos...
Page 6 - Unless this is performed, the engine will not run.
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 s...
Page 7 - Inputs; ECM
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 b...
Page 8 - power down position, ready for the next engine start.; Oxygen Sensor Heater Relay
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 und...
Page 9 - require that the ECM be replaced.
Lotus Service Notes Section EMN Page 9 MN.6 - MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR The MAP signal is fundamental 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. O...
Page 10 - Missing poles are positioned as follows, relative to no.1 cylinder:
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 cy...
Page 11 - will be substituted, and the cooling fan energised.
Lotus Service Notes Section EMN Page 11 EMN.8 - ENGINE COOLANT TEMPERATURE (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 p...
Page 12 - the ignition timing and avoid knock.
Lotus Service Notes Section EMN Page 12 EMN.9 - INTAKE AIR TEMPERATURE (IAT) SENSOR The intake air temperature (IAT) sensor is fitted into the inlet manifold tract of no.4 cylinder, and is a transducer with a negative temperature coefficient, such that its electrical resistance reduces with increasi...
Page 13 - Acceleration enrichment:; screws to pull the sensor into position.; Clamping plate
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,...
Page 14 - independently of the throttle butterfly.
Lotus Service Notes Section EMN Page 14 EMN.11 - IDLE AIR CONTROL (IAC) VALVE The idle air control (IAC) valve is mounted on the intake plenum, and controls an air passage which by- passes the throttle valve. When the pintle of the valve is fully extended, the passage is closed off for a minimum idl...
Page 15 - strength constantly sways either side of the ideal setting.
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 adjusts the air/fuel ratio to that providing the most eff...
Page 16 - Camshaft position sensor
Lotus Service Notes Section EMN Page 16 EMN.13 - CAMSHAFT POSITION SENSOR (VVC versions only) The camshaft 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 ...
Page 17 - the current period measured by the cam position sensor.
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, whi...
Page 18 - Oil temperature sensor
Lotus Service Notes Section EMN Page 18 EMN.15 - OIL TEMPERATURE 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. To replace the se...
Page 19 - pockets in the supply line of a stopped hot engine.
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-stage impeller pump, an in line canister filter, a common fuel rail supplying all four injectors, and a fuel pressure regulating valve controlling the re...
Page 21 - To check the fuel pressure:; does not exceed gauge capacity.; Fuel filter
Lotus Service Notes Section EMN Page 21 function of the regulator is to maintain a constant pressure differential across the injectors at all times. i.e. a constant difference between fuel pressure supplied to the injector, and inlet manifold pressure at the port injector nozzle. By using an intake ...
Page 22 - Push Fit Connectors
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 ...
Page 23 - Fuel Rail and Pressure Regulator Valve - Replacement
Lotus Service Notes Section EMN Page 23 Fuel Rail and Pressure Regulator Valve - 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 injecto...
Page 24 - with the spring clip.; Standard Engines; Idle Speed Control
Lotus Service Notes Section EMN Page 24 8. To 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, ...
Page 25 - Distributor; VVC Engines; suspected of being contaminated should be renewed.
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 retained by a patchlock screw. Always replace the screw, or retreat with Loctite 242. The rotor arm incorporates a sup- pressor and has a resistance valu...
