CONTROL SYSTEM


Engine-ECU or Engine-A-M/T-ECU

In accordance with the data input by the sensors, the engine-ECU or engine-A-M/T-ECU determines (calculates) optimal control and actuates the output actuators to suit the constantly changing driving conditions.
The engine-ECU or engine-A-M/T-ECU consists of a 32-bit microprocessor, random access memory (RAM), read only memory (ROM), and input-output (I/O interface).
It has adopted a rewritable flash-memory ROM in which the control data can be changed or corrected through the use of a special tool. In addition, it has adopted an electrically erasable programmable read only memory (EEPROM) so that the learned correction data will not be deleted even if the battery is disconnected.
Furthermore, the engine-A-M/T-ECU that is used on the automated manual transmission vehicles effects integrated control of the engine and the transmission.
ECU Connector Input / Output Pin Arrangement

7
 Throttle valve control servo (+)
 80
 Ignition switch-ST
8
 No. 1 injector
 81
 Fuel pump relay
9
 No. 2 injector
 82
 Backup power supply
10
 No. 1 ignition coil
 83
 Accelerator pedal position sensor (main)
11
 Neutral position sensor <Vehicles with AS&G system>
 84
 Accelerator pedal position sensor (main) ground
12
 Camshaft position sensor
 85
 Accelerator pedal position sensor (main) power supply
13
 Crank angle sensor
 86
 Accelerator pedal position sensor (sub) power supply
14
 Engine coolant temperature sensor
 87
 Accelerator pedal position sensor (sub) ground
15
 Throttle position sensor (main)
 88
 Accelerator pedal position sensor (sub)
16
 Throttle position sensor (sub)
 90
 Hood buzzer switch <Vehicles with AS&G system>
17
 Manifold absolute pressure sensor
 91
 Auto Stop & Go (AS&G) OFF switch <Vehicles with AS&G system>
20
 Detonation sensor (+)
 92
 Power supply
21
 Detonation sensor (-)
 93
 Throttle valve control servo ground
22
 Throttle valve control servo (-)
 94
 Oxygen sensor heater (rear)
23
 No. 3 injector
 95
 A/C compressor relay
24
 No. 4 injector <135 engine>
 97
 Oxygen sensor (front)
25
 No. 2 ignition coil
 98
 Oxygen sensor (front) ground
26
 Neutral position sensor earth <Vehicles with AS&G system>
 99
 Oxygen sensor (rear) ground
27
 Camshaft position sensor ground
 100
 Oxygen sensor (rear)
28
 Crank angle sensor ground
 101
 Clutch switch (B) <Vehicles with AS&G system>
29
 Engine coolant temperature sensor ground
 105
 CAN Hi
30
 Throttle position sensor ground
 106
 CAN Lo
31
 Throttle position sensor power supply
 107
 Engine control relay
32
 Manifold absolute pressure sensor power supply
 108
 Throttle valve control servo ground
33
 Manifold absolute pressure sensor ground
 110
 Battery current sensor power supply <Vehicles with AS&G system>
38
 Purge control solenoid valve
 111
 Battery current sensor <Vehicles with AS&G system>
40
 No. 3 ignition coil
 112
 Battery current sensor earth <Vehicles with AS&G system>
41
 Neutral position sensor power supply <Vehicles with AS&G system>
 113
 Clutch switch (A) <Vehicles with AS&G system>
50
 Oil pressure switch
 115
 Starter cut relay monitor <Vehicles with AS&G system>
51
 Alternator L terminal
 116
 Starter cut relay <Vehicles with AS&G system>
52
 Oil control valve <135 engine>
 120
 Starter active signal <Vehicles with AS&G system>
53
 Alternator G terminal
 122
 Ignition switch-IG
54
 Alternator FR terminal
 123
 Throttle valve control servo relay
55
 No. 4 ignition coil <135 engine>
 125
 Starter relay <Vehicles without AS&G system>, Starter control relay <Vehicles with AS&G system>
56
 Intake air temperature sensor
 127
 Brake vacuum sensor power supply <Vehicles with AS&G system>
75
 Ground
 128
 Brake vacuum sensor <Vehicles with AS&G system>
76
 Ground
 130
 Brake vacuum sensor earth <Vehicles with AS&G system>
77
 Power supply
 131
 Battery temperature sensor <Vehicles with AS&G system>
78
 Throttle valve control servo power supply
 135
 Capacitor relay <Vehicles with AS&G system>
79
 Oxygen sensor heater (front)
 136
 Flash EEPROM data rewriting power supply