Brought to you by BirfMark ENGINE CONTROL 58 Brought to you by BirfMark SYSTEM OUTLINE THE ENGINE CONTROL SYSTEM UTILIZES A MICROCOMPUTER AND MAINTAINS OVERALL CONTROL OF THE ENGINE, ETC. AN OUTLINE OF THE ENGINE CONTROL IS GIVEN HERE. 1. INPUT SIGNALS (1) ENGINE COOLANT TEMP. SIGNAL CIRCUIT THE ENGINE COOLANT TEMP. SENSOR DETECTS THE ENGINE COOLANT TEMP. AND HAS A BUILT-IN THERMISTOR WITH A RESISTANCE WHICH VARIES ACCORDING TO THE WATER TEMP. IS INPUT INTO TERMINAL THW OF THE ENGINE CONTROL MODULE AS A CONTROL SIGNAL. (2) INTAKE AIR TEMP. SIGNAL CIRCUIT THE INTAKE AIR TEMP. SENSOR IS INSTALLED IN THE MASS AIR FLOW AND DETECTS THE INTAKE AIR TEMP.
WHICH IS INPUT AS A CONTROL SIGNAL TO TERMINAL THA OF THE ENGINE CONTROL MODULE. (3) OXYGEN DENSITY SIGNAL CIRCUIT THE OXYGEN DENSITY IN THE EXHAUST EMISSION IS DETECTED AND INPUT AS A CONTROL SIGNAL FROM THE HEATED OXYGEN SENSOR (BANK 1 SENSOR 1, BANK 1 SENSOR 2) TO TERMINALS OX1, OX2 OF THE ENGINE CONTROL MODULE. TO STABILIZE DETECTION PERFORMANCE BY THE HEATED OXYGEN SENSOR IS WARMED. (4) RPM SIGNAL CIRCUIT CRANKSHAFT POSITION IS DETECTED BY THE CRANKSHAFT POSITION SENSOR AND THE PICK-UP COIL INSTALLED INSIDE THE DISTRIBUTOR. CRANKSHAFT POSITION IS INPUT AS A CONTROL SIGNAL TO TERMINAL NE2+ OF THE ENGINE CONTROL MODULE, AND ENGINE SPEED IS INPUT TO TERMINAL NE.
(5) THROTTLE POSITION SIGNAL CIRCUIT THE THROTTLE POSITION SENSOR DETECTS THE THROTTLE VALVE OPENING ANGLE AS A CONTROL SIGNAL WHICH IS INPUT INTO TERMINAL VTA OF THE ENGINE CONTROL MODULE. WHEN THE VALVE IS COMPLETELY CLOSED, THE ENGINE IDLING SIGNAL IS INPUT INTO TERMINAL IDL. (6) VEHICLE SPEED CIRCUIT THE VEHICLE SPEED IS DETECTED BY VEHICLE SPEED SENSOR INSTALLED IN THE TRANSMISSION, AND THE SIGNAL IS INPUT TO TERMINAL SPD OF THE ENGINE CONTROL MODULE VIA THE COMBINATION METER. (7) NEUTRAL POSITION SIGNAL CIRCUIT THE PARK/NEUTRAL POSITION SW DETECTS WHETHER THE SHIFT POSITION IS IN “N” AND “P” OR NOT, AND THE SIGNAL IS INPUT INTO TERMINAL STA OF THE ENGINE CONTROL MODULE.
(8) A/C SW SIGNAL CIRCUIT THE OPERATING VOLTAGE OF THE A/C MAGNETIC CLUTCH IS DETECTED, AND THE SIGNAL IS INPUT INTO TERMINAL A/C OF THE ENGINE CONTROL MODULE AS A CONTROL SIGNAL. (9) BATTERY SIGNAL CIRCUIT VOLTAGE IS CONSTANTLY APPLIED TO TERMINAL BATT OF THE ENGINE CONTROL MODULE. WITH THE IGNITION SW TURNED ON, THE VOLTAGE FOR ENGINE CONTROL MODULE START-UP POWER SUPPLY IS APPLIED TO TERMINAL +B OF THE ENGINE CONTROL MODULE VIA THW EFI MAIN RELAY. THE CURRENT FLOW THROUGH THE IGN FUSE FLOWS TO TERMINAL IGSW OF THE ENGINE CONTROL MODULE.
(10) INTAKE AIR VOLUME SIGNAL CIRCUIT INTAKE AIR VOLUME IS DETECTED BY THE MASS AIR FLOW, AND THE SIGNAL IS INPUT TO TERMINAL VG OF THE ENGINE CONTROL MODULE AS A CONTROL SIGNAL. (11) STOP LIGHT SW SIGNAL CIRCUIT THE STOP LIGHT SW IS USED TO DETECT WHETHER THE VEHICLE IS BRAKING OR NOT, AND THE SIGNAL IS INPUT INTO TERMINAL STP OF THE ENGINE CONTROL MODULE AS A CONTROL SIGNAL. (12) STARTER SIGNAL CIRCUIT TO CONFIRM WHETHER THE ENGINE IS CRANKING, THE VOLTAGE IS APPLIED TO THE STARTER MOTOR DURING CRANKING IS DETECTED AND THE SIGNAL IS INPUT INTO TERMINAL NSW OF THE ENGINE CONTROL MODULE AS A CONTROL SIGNAL.
(13) ENGINE KNOCK SIGNAL CIRCUIT ENGINE KNOCKING IS DETECTED BY THE KNOCK SENSOR 1 AND 2, AND THE SIGNAL IS INPUT INTO TERMINALS KNK1 AND KNK2 AS A CONTROL SIGNAL.