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




Terminal No.
Terminal code
Terminal name
Terminal No.
Terminal code
Terminal name
1
OCVI
Inlet oil feeder control valve
2
INJ1
No. 1 injector
3
INJ2
No. 2 injector
4
CIL1
No. 1 ignition coil
5
CIL2
No. 2 ignition coil
6
NTSW
Starter active signal
8
SGT
Crank angle sensor
9
5V
Sensor supplied voltage
10
TPSM
Throttle position sensor (main)
11
TPSS
Throttle position sensor (sub)
12
TPS5
Power supply voltage applied to throttle position sensor
13
TPSE
Throttle position sensor earth
14
CPI
Inlet camshaft position sensor
15
ETV+
Throttle valve control servo (+)
16
ETV-
Throttle valve control servo (-)
18
INJ3
No. 3 injector
19
INJ4
No. 4 injector
20
CIL3
No. 3 ignition coil
21
CIL4
No. 4 ignition coil
24
SGTE
Crank angle sensor earth
25
K/S
Detonation sensor (+)
26
WTS
Engine coolant temperature sensor
27
WTSE
Engine coolant temperature sensor earth
30
CPIE
Inlet camshaft position sensor earth
34
OHFL
Oxygen sensor (front) heater
35
OHRL
Oxygen sensor (rear) heater
36
OPSW
Oil pressure switch
37
PURG
Purge control solenoid valve
38
O2FL
Oxygen sensor (front)
39
OFLE
Oxygen sensor (front) offset voltage
40
O2RL
Oxygen sensor (rear)
41
ORLE
Oxygen sensor (rear) offset voltage
42
K/SE
Detonation sensor (-)
44
MAP5
Power supply voltage applied to manifold absolute pressure sensor
45
MAP
Manifold absolute pressure sensor
46
MAPE
Manifold absolute pressure sensor earth
60
ALTG
Alternator G terminal
61
ALTF
Alternator FR terminal
62
ALTL
Alternator L terminal
71
RSG
Throttle valve control servo earth
72
RSB
Power supply voltage applied to throttle valve control servo
73
C/R
Engine control relay
74
APSM
Accelerator pedal position sensor (main)
75
APS5
Power supply voltage applied to accelerator pedal position sensor (main)
76
APSE
Accelerator pedal position sensor (main) earth
77
APSS
Accelerator pedal position sensor (sub)
78
5VV
Power supply voltage applied to accelerator pedal position sensor (sub)
79
EV
Accelerator pedal position sensor (sub) earth
81
GNDE
Engine-ECU earth
82
BAT1
Power source
83
RSH
Throttle valve control servo earth
84
C/RL
Throttle valve control servo relay
87
AFS
Air flow sensor
88
AFSE
Air flow sensor earth
89
ATS
Intake air temperature sensor
90
CANH
CAN interface (high)
91
CANL
CAN interface (low)
92
IGN
Ignition switch-IG
93
GNDE
Engine-ECU earth
96
FP/R
Fuel pump relay
97
AFS5
Air flow sensor reference voltage
102
AC/R
A/C compressor relay
103
FMB
Flash EP-ROM data rewriting power source
104
BACK
Backup power source
105
ST
Ignition switch-ST
106
STRL
Starter relay
108
BRK
Brake switch