User manual MITSUBISHI ENGINE AND EMISSION CONTROL SERVICE SPECIFICATIONS

[. . . ] 17 17-2 ENGINE AND EMISSION CONTROL - Engine Control System 17100010102 ENGINE CONTROL SYSTEM GENERAL INFORMATION A cable-type accelerator mechanism and a suspended-type pedal have been adopted. Accelerator pedal position sensor is used for vehicles with 4G6 engine which is equipped with the electronically-controlled fuel injection system. 17100030139 SERVICE SPECIFICATION Items Accelerator cable play mm Standard value 1-2 ON-VEHICLE SERVICE ACCELERATOR CABLE CHECK AND ADJUSTMENT 17100090243 1. Confirm idle speed is at prescribed value. (Refer to GROUP 11 - On-vehicle Service. ) 4. Confirm there are no sharp bends in accelerator cable. [. . . ] Check the connection condition of the vacuum hoses, (removed, loose, etc. ) and check to be sure that there are no bends or damage. VACUUM HOSE INSTALLATION 1. When connecting the vacuum hoses, they should be securely inserted onto the nipples. Connect the hoses correctly, using the vacuum hose piping diagram as a guide. 17-10 ENGINE AND EMISSION CONTROL - Emission Control System CRANKCASE EMISSION CONTROL SYSTEM GENERAL INFORMATION The crankcase emission control system prevents blow-by gases from escaping inside the crankcase into the atmosphere. Fresh air is sent from the air cleaner into the crankcase through the breather hose. The air becomes mixed with the blow-by gases inside the crankcase. The blow-by gas inside the crankcase is drawn into the intake manifold through the positive crankcase ventilation (PCV) valve. The PCV valve lifts the plunger according to the intake manifold vacuum so as to regulate the flow of blow-by gas properly. In other words, the blow-by gas flow is regulated during low load engine operation to maintain engine stability, while the flow is increased during high load operation to improve the ventilation performance. SYSTEM DIAGRAM Ventilation hose PCV valve Breather hose COMPONENT LOCATION PCV valve <4G9> PCV valve <4G6> ENGINE AND EMISSION CONTROL - Emission Control System 17-11 POSITIVE CRANKCASE VENTILATION SYSTEM CHECK 1. Remove the ventilation hose from the PCV valve. Remove the PCV valve from the rocker cover. Reinstall the PCV valve at the ventilation hose. Place a finger at the opening of the PCV valve and check that vacuum of the intake manifold is felt. PCV valve NOTE At this moment, the plunger in the PCV valve moves back and forth. If vacuum is not felt, clean the PCV valve or replace it. PCV VALVE CHECK 1. Insert a thin rod into the PCV valve from the side shown in the illustration (rocker cover installation side), and move the rod back and forth to check that the plunger moves. If the plunger does not move, there is clogging in the PCV valve. In this case, clean or replace the PCV valve. 17-12 ENGINE AND EMISSION CONTROL - Emission Control System EVAPORATIVE EMISSION CONTROL SYSTEM GENERAL INFORMATION The evaporative emission control system prevents fuel vapours generated in the fuel tank from escaping into the atmosphere. Fuel vapours from the fuel tank flow through the fuel tank pressure control valve and vapour pipe/hose to be stored temporarily in the canister. When driving the vehicle, fuel vapours stored in the canister flow through the purge solenoid and purge port and go into the intake manifold to be sent to the combustion chamber. When the engine coolant temperature is low or when the intake air quantity is small (when the engine is at idle, for example), the engine control unit turns the purge solenoid off to shut off the fuel vapour flow to the intake manifold. This does not only insure the driveability when the engine is cold or running under low load but also stabilize the emission level. SYSTEM DIAGRAM Throttle body Engine-ECU Canister From fuel tank Purge control solenoid valve (ON: Open) Control relay Air flow sensor Engine coolant temperature sensor Intake air temperature sensor Barometric pressure sensor COMPONENT LOCATION Purge control solenoid valve <4G9> Purge control solenoid valve<4G6> ENGINE AND EMISSION CONTROL <4G9> Vacuum hose (red stripe) Emission Control System 17-13 PURGE CONTROL SYSTEM CHECK 1. [. . . ] Connect each clip to the negative ( - ) terminal of power supply in the order given below to test if any vibration occurs (as though the stepper motor is shaking slightly) due to the operation of the stepper motor. (1) Connect terminal No. 1 and terminal No. 4 to negative ( - ) terminal of the power supply. (2) Connect terminal No. 3 and terminal No. 4 to negative ( - ) terminal of the power supply. (3) Connect terminal No. 3 and terminal No. 6 to negative ( - ) terminal of the power supply. [. . . ]