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ENGINE CONTROL (5S–FE)<br />
SYSTEM OUTLINE<br />
THIS SYSTEM UTILIZES AN ENGINE CONTROL MODULE (ENGINE ECU (M/T), ENGINE AND ELECTRONIC CONTROLLED<br />
TRANSMISSION ECU (A/T)) AND MAINTAINS OVERALL CONTROL OF THE ENGINE, TRANSMISSION AND SO ON. AN OUTLINE OF THE<br />
ENGINE CONTROL IS EXPLAINED HERE.<br />
1. INPUT SIGNALS<br />
(1) ENGINE COOLANT TEMP. (WATER TEMP.) SIGNAL SYSTEM<br />
THE ENGINE COOLANT TEMP. SENSOR (EFI WATER TEMP. SENSOR) DETECTS THE ENGINE COOLANT TEMP. AND HAS A<br />
BUILT–IN THERMISTOR WITH A RESISTANCE WHICH VARIES ACCORDING TO THE ENGINE COOLANT TEMP. (WATER TEMP.)<br />
THUS THE ENGINE COOLANT TEMP. (WATER TEMP.) IS INPUT IN THE FORM OF A CONTROL SIGNAL TO TERMINAL THW OF<br />
THE ENGINE CONTROL MODULE (ECU).<br />
(2) INTAKE AIR TEMP. SIGNAL SYSTEM<br />
THE INTAKE AIR TEMP. SENSOR (IN–AIR TEMP. SENSOR) IS DETECTS THE INTAKE AIR TEMP., WHICH IS INPUT AS A<br />
CONTROL SIGNAL TO TERMINAL THA OF THE ENGINE CONTROL MODULE (ECU).<br />
(3) OXYGEN SENSOR SIGNAL SYSTEM<br />
THE OXYGEN DENSITY IN THE EXHAUST GASES IS DETECTED AND INPUT AS A CONTROL SIGNAL TO TERMINAL OX1 AND<br />
OX2 OF THE ENGINE CONTROL MODULE (ECU).<br />
(4) RPM SIGNAL SYSTEM<br />
CRANKSHAFT POSITION AND ENGINE RPM ARE DETECTED BY THE PICK–UP COIL INSTALLED INSIDE THE DISTRIBUTOR.<br />
CRANKSHAFT POSITION IS INPUT AS A CONTROL SIGNAL TO TERMINALS G+ AND G2 (CALIFORNIA), OF THE ENGINE<br />
CONTROL MODULE (ECU), AND RPM IS INPUT TO TERMINAL NE+.<br />
(5) THROTTLE SIGNAL SYSTEM<br />
THE THROTTLE POSITION SENSOR DETECTS THE THROTTLE VALVE OPENING ANGLE, WHICH IS INPUT AS A CONTROL<br />
SIGNAL TO TERMINAL VTA OF THE ENGINE CONTROL MODULE (ECU), OR WHEN THE VALVE IS FULLY CLOSED, TO<br />
TERMINAL IDL<br />
(6) VEHICLE SPEED SIGNAL SYSTEM<br />
THE VEHICLE SPEED SENSOR (SPEED SENSOR), INSTALLED INSIDE THE COMBINATION METER, DETECTS THE VEHICLE<br />
SPEED AND INPUTS A CONTROL SIGNAL TO TERMINAL SPD OF THE ENGINE CONTROL MODULE (ECU).<br />
(7) PARK/NEUTRAL POSITION SW (NEUTRAL START SW) SIGNAL SYSTEM (A/T)<br />
THE PARK/NEUTRAL POSITION SW (NEUTRAL START SW) DETECTS WHETHER THE SHIFT POSITION ARE IN NEUTRAL AND<br />
PARKING OR NOT, AND INPUTS A CONTROL SIGNAL TO TERMINAL NSW OF THE ENGINE CONTROL MODULE (ECU).<br />
(8) A/C SW SIGNAL SYSTEM<br />
THE A/C AMPLIFIER INPUTS THE A/C OPERATIONS TO TARMINAL ACA OF THE ENGINE CONTROL MODULE (ECU) AS A<br />
CONTROL SIGNAL.<br />
(9) BATTERY SIGNAL CIRCUIT<br />
VOLTAGE IS CONSTANTLY APPLIED TO TERMINAL BATT OF THE ENGINE CONTROL MODULE (ECU). WHEN THE IGNITION SW<br />
TURNED ON, THE VOLTAGE FOR ENGINE CONTROL MODULE (ECU) START–UP POWER SUPPLY IS APPLIED TO TERMINALS<br />
+B AND +B1 OF ENGINE CONTROL MODULE (ECU) VIA EFI MAIN RELAY. THE CURRENT FLOWING THROUGH THE IGN FUSE<br />
FLOWS TO TERMINAL IGSW OF THE ENGINE CONTROL MODULE (ECU).<br />
(10) INTAKE AIR VOLUME SIGNAL SYSTEM<br />
INTAKE AIR VOLUME IS DETECTED BY THE MANIFOLD ABSOLUTE PRESSURE SENSOR (VACUUM SENSOR) (FOR MANIFOLD<br />
PRESSURE) AND IS INPUT AS A CONTROL SIGNAL TO TERMINAL PIM OF THE ENGINE CONTROL MODULE (ECU).<br />
(11) STA SIGNAL CIRCUIT<br />
TO CONFIRM WHETHER THE ENGINE IS CRANKING, THE VOLTAGE APPLIED TO THE STARTER MOTOR DURING CRANKING IS<br />
DETECTED AND THE SIGNAL IS INPUT INTO TERMINAL STA OF THE ENGINE CONTROL MODULE (ECU) AS A CONTROL<br />
SIGNAL.<br />
(12) ENGINE KNOCK SIGNAL CIRCUIT<br />
ENGINE KNOCKING IS DETECTED BY KNOCK SENSOR AND THE SIGNAL IS INPUT INTO TERMINAL KNK AS A CONTROL<br />
SIGNAL.<br />
(13) ELECTRICAL LOAD SIGNAL SYSTEM<br />
THE SIGNAL WHEN SYSTEMS SUCH AS THE REAR WINDOW DEFOGGER, HEADLIGHTS, ETC. WHICH CAUSE A HIGH<br />
ELECTRICAL BURDEN ARE ON IS INPUT TO TERMINAL ELS AS A CONTROL SIGNAL.<br />
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