MULTIPOINT FUEL INJECTION (MPI) <4G63-Non-Turbo>

Transcription

1 13A-1 GROUP 13A MULTIPOINT FUEL INJECTI (MPI) <4G63-Non-Turbo> CTENTS GENERAL INFORMATI A-2 FUEL INJECTI CTROL A-6 IDLE SPEED CTROL (ISC) A-7 IGNITI TIMING AND DISTRIBUTI CTROL A-8 EGR CTROL, PURGE CTROL A-8 OTHER CTROL FUNCTIS A-8 DIAGNOSIS SYSTEM A-9

2 13A-2 The control is based upon that to the 4G6-MPI engine used in the SPACE WAG. It incorporates the following enhancements: MULTIPOINT FUEL INJECTI (MPI) <4G63-Non-Turbo> GENERAL INFORMATI GENERAL INFORMATI M Improvements Bimetal type limiter in throttle body has been discontinued. Idle position switch has been discontinued. Remarks Simplified structure Changed to a control logic that is based primarily on throttle position signals. SYSTEM BLOCK DIAGRAM Air flow Intake air temperature Barometric pressure Engine coolant temperature Throttle position A/C switch A/C load signal A/C pressure Camshaft position Crank angle Vehicle speed Power steering fluid pressure switch Detonation Oxygen (front) Oxygen (rear) Ignition switch-ig Ignition switch-st Alternator FR terminal Power supply Engine-ECU Fuel injection control Idle speed control Ignition timing control Engine control relay control Fuel pump relay control A/C relay control Fan motor control (Radiator, A/C condenser) Alternator control Air flow filter reset control Engine warning lamp control Oxygen heater control EGR control Purge control Diagnosis output RAM data transmission No. 1 injector No. 2 injector No. 3 injector No. 4 injector Idle speed control servo (Stepper motor) No. 1, No. 4 ignition coil No. 2, No. 3 ignition coil Engine control relay Fuel pump relay Tachometer A/C compressor relay Fan controller (Radiator, A/C condenser) Alternator G terminal Air flow reset signal Engine warning lamp (check engine lamp) Oxygen heater (front) Oxygen heater (rear) EGR control solenoid valve Purge control solenoid valve Diagnosis output terminal AK204337AB

3 CTROL SYSTEM DIAGRAM MULTIPOINT FUEL INJECTI (MPI) <4G63-Non-Turbo> 13A-3 GENERAL INFORMATI 1 Oxygen (front) 2 Oxygen (rear) 3 Air flow 4 Intake air temperature 5 Throttle position 6 Camshaft position 7 Crank angle 8 Barometric pressure 9 Engine coolant temperature 10 Detonation Power supply Ignition switch-ig Ignition switch-st A/C switch A/C load signal A/C pressure Power steering fluid pressure switch Alternator FR terminal Vehicle speed Engine-ECU 1 Injector 2 Idle speed control servo (Stepper motor) 3 EGR control solenoid valve 4 Purge control solenoid valve Engine control relay Fuel pump relay A/C compressor relay Ignition coil Fan controller Engine warning lamp Diagnosis output Alternator G terminal Oxygen heater Tachometer 6 Camshaft position 5 Throttle position 4 Intake air temperature 2 Idle speed control servo (Stepper motor) 3 Air flow 8 Barometric pressure Fuel pressure regulator M M A Air To fuel tank From fuel pump 1 Oxygen (front) EGR valve Canister Catalytic converter 1 Injector 9 Engine coolant temperature 3 EGR control solenoid valve 10 Detonation 7 Crank angle 2 Oxygen (rear) 4 Purge control solenoid valve Catalytic converter AK204338AB

4 13A-4 MULTIPOINT FUEL INJECTI (MPI) <4G63-Non-Turbo> GENERAL INFORMATI LIST OF COMPENT FUNCTIS Name Function ECU Engine-ECU Uses the signals input from the various s to control operation of actuators in accordance with the driving conditions. Sensors Ignition switch-ig Detects the /OFF position of the ignition switch. When this signal is input to the engine-ecu, power is supplied to components such as the injectors, air flow, idle speed control servo and crank angle. Ignition switch-st Detects whether the engine is cranking. The engine-ecu controls the fuel injection, throttle valve opening angle and ignition timing to the appropriate settings based on this signal. Air flow Senses air intake volume using Karman flow meter. In accordance with this information and engine speed, engine-ecu controls injectors' basic activation duration. Barometric pressure Oxygen Intake air temperature Engine coolant temperature Throttle position Vehicle speed Detonation Camshaft position Crank angle Alternator FR terminal Power steering fluid pressure switch Senses atmospheric pressure using semiconductor diffused pressure. In accordance with data from this, engine-ecu determines vehicle's altiude above sea level and adjusts fuel injection rate as a function of altitude to ensure appropriate air/fuel ratio. Detects the concentration of oxygen in the exhaust gas by means of zirconia and platinum electrodes. The engine-ecu judges whether the air/fuel mixture ratio is at the stoichiometric ratio based on this concentration. Detects the temperature of the intake air by means of a thermistor. The engine-ecu corrects the fuel injection amount to the correct amount corresponding to the intake air temperature based on the voltage output from this. Detects the temperature of the engine coolant by means of a thermistor. The engine-ecu detects how warm the engine is based on the signal from this, and uses this to control the fuel injection amount, idle speed and ignition timing. Detects the throttle valve opening angle by means of a potentiometer. The engine-ecu controls the throttle valve and also determines the optimum fuel injection for how quick the throttle valve is opened based on the voltage output from this. Uses magnetic resistance element to sense vehicle speed. It output 4 pulses per its rotation. Detects cylinder block vibration when knocking is generated by the piezoelectric element. The engine-ecu controls retardation of the ignition timing according to the knocking strength. Detects the No. 1 cylinder compression top dead center position by means of a hall element. Detects the crank angle by means of a Hall element. The engine-ecu controls the injectors based on the signal from this. Detects the energizing duty ratio of the alternator field coil. Detects whether there is a power steering load present by means of a contact switch.

5 Name MULTIPOINT FUEL INJECTI (MPI) <4G63-Non-Turbo> 13A-5 GENERAL INFORMATI Sensors A/C switch Detects the /OFF condition of the A/C. Actuators A/C load signal A/C pressure Diagnosis control terminal A/C inputs the drive state of the compressor (low load/high load) to the engine-ecu. The engine-ecu controls the A/C idle-up engine speed using this signal. A/C detects the refrigerant pressure and inputs the load of the A/C compressor to the engine-ecu. If diagnosis codes have been stored in memory, they can be displayed through the flashing of the engine warning lamp by connecting this terminal to the vehicle earth. Engine control relay Turns the engine-ecu power circuit on and off. Injector Drives the fuel injection by means of drive signals from the engine-ecu. Multiple spray hole type is used. Ignition coil (with power transistor) Idle speed control (ISC) servo steeper motor EGR control solenoid valve Fuel pump relay Fan controller Purge control solenoid valve Alternator G terminal A/C relay Oxygen heater Engine warning lamp Tachometer Function Interrupts the ignition coil primary current in accordance with the ignition signals from the engine-ecu, in order to generate a high voltage for ignition. The throttle valve bypass air amount during idling and deceleration is controlled with the signal from the engine-ecu. Controls the EGR flow through signals under the duty control from engine-ecu. Turns the pump on and off. Controls the radiator and condenser fan speeds smoothly by means of signals from the engine-ecu. Controls the amount of purge air introduced to the air intake plenum through signals under the duty control from the engine-ecu. Controls the amount of power generated by the alternator by means of signals from the engine-ecu. Controls the operation of the A/C compressor. Heats up the oxygen in response to the signals from the engine-ecu. llluminates to notify the driver of any abnormalities when a problem occurs with any of the s. The tachometer in the speedometer indicates the engine speed.

6 13A-6 The control arrangement is basically the same as that 4G6-MPI engine using SPACE WAG. MULTIPOINT FUEL INJECTI (MPI) <4G63-Non-Turbo> FUEL INJECTI CTROL FUEL INJECTI CTROL M SYSTEM CFIGURATI DIAGRAM Fuel pressure regulator From fuel pump Air flow Intake air temperature To fuel tank Engine coolant temperature Throttle position Engine-ECU Camshaft position Catalytic converter Crank angle Barometric pressure Oxygen (front) Oxygen (rear) Detonation Ignition switch-st Catalytic converter AK204339AB

7 MULTIPOINT FUEL INJECTI (MPI) <4G63-Non-Turbo> 13A-7 IDLE SPEED CTROL (ISC) The idle speed control (ISC) is basically the same as that of the 4G6-MPI engine of the previous SPACE WAG, except for the following changes: SYSTEM CFIGURATI DIAGRAM IDLE SPEED CTROL (ISC) M The bimetal type limiter has been discontinued and the has been simplified. Barometric pressure Intake temperature Engine coolant temperature Throttle position Idle speed control servo (stepper motor) Engine-ECU Camshaft position Crank angle A/C switch To intake manifold From air cleaner Speed adjusting screw Power steering fluid pressure switch Alternator FR terminal Ignition switch-ig Ignition switch-st AK204340AB

8 13A-8 MULTIPOINT FUEL INJECTI (MPI) <4G63-Non-Turbo> IGNITI TIMING AND DISTRIBUTI CTROL IGNITI TIMING AND DISTRIBUTI CTROL The control arrangement is basically the same as that 4G6-MPI engine using SPACE WAG. SYSTEM CFIGURATI DIAGRAM M Air flow Intake temperature Engine coolant temperature Ignition coil B Ignition coil A Ignition switch Camshaft position Engine-ECU Crank angle Barometric pressure Detonation Ignition switch-st Spark plugs Cylinder No Battery AK AB Refer to EMISSI CTROL SYSTEM EGR CTROL, PURGE CTROL M OTHER CTROL FUNCTIS The following controls are basically the same as those of the 4G6-MPI engine of the SPACE WAG: Fan motor control Power supply Fuel pump relay control Oxygen heater control A/C pressure relay control Air flow filter reset control Alternator control M

9 MULTIPOINT FUEL INJECTI (MPI) <4G63-Non-Turbo> 13A-9 DIAGNOSIS SYSTEM Engine -ECU has been provided with the following functions for easier inspection. DIAGNOSIS CODE The diagnosis and engine warning lamp items are given in the table below. DIAGNOSIS SYSTEM M FREEZE-FRAME DATA When the engine-ecu detects a problem and stores the resulting diagnosis code, the engine condition at that time is also memorized. The M.U.T.-II/III can then be used to analyze this data in order to increase the effectiveness of troubleshooting. The freeze-frame data display items are given below. Item No. Data Unit 21 Engine coolant temperature C 22 Engine speed r/min 24 Vehicle speed km/h 80 Long-term fuel compensation (long-term fuel trim) % 82 Short-term fuel compensation (short-term fuel trim) % 88 Fuel control condition Open loop Closed loop Open loop owing to drive condition Open loop owing to malfunction Closed loop based on one oxygen 97 Calculated lode value % Code No. Diagnosis item Main diagnosis contents Engine warning lamp P0100 Air flow -related circuits P0105 P0110 P0115 Barometric pressure Intake air temperature Engine coolant temperature -related circuits -related circuits -related circuits P0120 Throttle position -related circuits P0125* Feedback monitor Oxygen not operating P0130 P0135 Oxygen (front) <Sensor 1> Oxygen heater (front) <Sensor 1> -related circuits heater-related circuits

10 13A-10 MULTIPOINT FUEL INJECTI (MPI) <4G63-Non-Turbo> DIAGNOSIS SYSTEM Code No. Diagnosis item Main diagnosis contents Engine warning lamp P0136 P0141 Oxygen (rear) <Sensor 2> Oxygen heater (rear) <Sensor 2> -related circuits heater-related circuits P0170 Abnormal fuel Leanness or richness problem P0201 No. 1 injector injector-related circuits P0202 No. 2 injector injector-related circuits P0203 No. 3 injector injector-related circuits P0204 No. 4 injector injector-related circuits P0300 Random cylinder mis-fire detection Abnormal ignition signal (Mis-firing) P0301* No. 1 cylinder mis-fire detection Mis-firing P0302* No. 2 cylinder mis-fire detection P0303* No. 3 cylinder mis-fire detection P0304* No. 4 cylinder mis-fire detection P0325 Detonation Abnormal output P0335 Crank angle Abnormal output P0340 Camshaft position Abnormal output P0403 Exhaust gas recirculation (EGR) control solenoid valve solenoid valve-related circuits P0420 Catalyst deterioration Abnormal exhaust gas purification performance of catalyst P0443 Purge control solenoid valve solenoid valve-related circuits P0500 Vehicle speed -related circuits P0505 Idle speed control Idle speed control servo inoperable P0551* Power steering fluid pressure switch -related circuits P0622 Alternator FR terminal Open circuit in -related circuits P1603* Battery back-up line Open circuit in -related circuits P1610 Immobilizer Open circuit in -related circuits Engine-ECU Abnormality in engine-ecu

11 MULTIPOINT FUEL INJECTI (MPI) <4G63-Non-Turbo> 13A-11 DIAGNOSIS SYSTEM NOTE: When the first time a malfunction is detected, the engine-ecu does not store a fault code. However, if the same malfunction is again detected the next time the engine is operated, a fault code is stored. For s or components marked with "*" to be diagnosed, when the first time a malfunction is detected, a fault code is stored and the engine warning lamp is illuminated. DATA LIST FUNCTI The data list items are given in the table below Item No. Inspection item Unit 11 Oxygen (front) mv 12 Air flow Hz 13 Intake air temperature C 14 Throttle position mv 16 Power supply voltage V 18 Cranking signal (ignition switch-st) /OFF 21 Engine coolant temperature C 22 Crank angle r/min 25 Barometric pressure kpa 27 Power steering fluid pressure switch /OFF 28 A/C switch /OFF 3A A/C pressure mv 41 Injectors ms 44 Ignition advance BTDC 45 Idle speed control (stepper motor) position STEP 49 A/C relay /OFF 59 Oxygen (rear) mv 12* Air flow gm/s 13* Intake air temperature C 21* Engine coolant temperature C 22* Crank angle r/min 24* Vehicle speed signal km/h 44* Ignition advance deg 81* Long-term fuel compensation % 82* Short-term fuel compensation % 87* Calculated load valve % 88* Fuel control condition Closed loop/open loop drive condition 8A* Throttle position (Throttle valve opening rate) % A1* Oxygen (front) V A2* Oxygen (rear) V NOTE: Items marked "*" will not appear if a data list is selected in the check mode.

12 13A-12 MULTIPOINT FUEL INJECTI (MPI) <4G63-Non-Turbo> DIAGNOSIS SYSTEM ACTUATOR TEST FUNCTI The actuator test items are given in the table below Item No. Inspection item Drive contents 01 Injectors Cut fuel to No.1 injector 02 Cut fuel to No.2 injector 03 Cut fuel to No.3 injector 04 Cut fuel to No.4 injector 07 Fuel pump Fuel pump operates and fuel is recirculated 08 Purge control solenoid valve Solenoid valve turns from OFF to 10 EGR control solenoid valve Solenoid valve turns from OFF to 17 Basic ignition timing Set to ignition adjustment mode 21 Fan controller Drive the fan motor