CONTROL UNIT


ENGINE-ECU




Engine-ECU is installed in the engine room. Engine-ECU judges (calculates) the optimum control to deal with the constant minute changes in driving conditions based on information input from the sensors and drives the actuator. Engine-ECU is composed of 32-bit microprocessor and Random Access Memory (RAM), Read Only Memory (ROM) and Input /Output interface. Engine-ECU uses flash-memory ROM that allows re-writing of data so that change and correction of control data is possible using special tools. It also uses Electrically Erasable Programmable Read Only Memory (EEPROM) so that studied compensation data is not deleted even if battery terminals are disconnected.

ENGINE-ECU CONNECTOR INPUT/OUTPUT PIN ARRANGEMENT




1
 Oil feeder control valve
 2
 No. 1 injector
3
 No. 2 injector
 4
 Ignition coil No. 1
5
 Ignition coil No. 2
 6
 Starter active signal
8
 Crank angle sensor
 9
 Sensor supplied voltage
10
 Throttle position sensor (main)
 11
 Throttle position sensor (sub)
12
 Power supply voltage applied to throttle position sensor
 13
 Throttle position sensor earth
14
 Camshaft position sensor
 15
 Throttle valve control servo (+)
16
 Throttle valve control servo (-)
 18
 No. 3 injector
19
 No. 4 injector
 20
 Ignition coil No. 3
21
 Ignition coil No. 4
24
 Crank angle sensor earth
25
 Left bank detonation sensor
 26
 Engine coolant temperature sensor
27
 Engine coolant temperature sensor earth
 28
 Right bank detonation sensor
29
 Right bank detonation sensor earth
 30
 Camshaft position sensor earth
33
 Right bank oxygen sensor (front) heater
 34
 Left bank oxygen sensor (front) heater
35
 Left bank oxygen sensor (rear) heater
 36
 Engine oil pressure switch (for warning lamp)
37
 Purge control solenoid valve
 38
 Left bank oxygen sensor (front)
39
 Left bank oxygen sensor (front) offset voltage
 40
 Left bank oxygen sensor (rear)
41
 Left bank oxygen sensor (rear) offset voltage
 42
 Left bank detonation sensor earth
44
 Power supply voltage applied to manifold absolute pressure sensor
 45
 Manifold absolute pressure sensor
46
 Manifold absolute pressure sensor earth
 49
 Right bank oxygen sensor (rear) heater
50
 No. 5 injector
 51
 No. 6 injector
52
 Ignition coil No. 5
 53
 Ignition coil No. 6
54
 Right bank oxygen sensor (front)
 55
 Right bank oxygen sensor (front) offset voltage
56
 Right bank oxygen sensor (rear)
 57
 Right bank oxygen sensor (rear) offset voltage
58
 Power steering fluid pressure switch
 60
 Alternator G terminal
61
 Alternator FR terminal
 62
 Alternator L terminal
71
 Throttle valve control servo earth
 72
 Throttle valve control servo power supply
73
 Engine control relay
 74
 Accelerator pedal position sensor (main)
75
 Power supply voltage applied to accelerator pedal position sensor (main)
 76
 Accelerator pedal position sensor (main) earth
77
 Accelerator pedal position sensor (sub)
 78
 Power supply voltage applied to accelerator pedal position sensor (sub)
79
 Accelerator pedal position sensor (sub) earth
 81
 Earth
82
 Power supply
 83
 Throttle valve control servo earth
84
 Throttle valve control servo relay
 87
 Air flow sensor
88
 Air flow sensor earth
 89
 Intake air temperature sensor
90
 CAN interface (high)
 91
 CAN interface (low)
92
 Ignition switch-IG
 93
 Earth
96
 Fuel pump relay
 102
 A/C compressor relay
103
 Flash EP-ROM power supply
 104
 Backup power supply
105
 Ignition switch-ST
 106
 Starter relay