1G ECU Pinouts, Horizontal Layout


 
Pin Connection   Pin Connection
101 Ground 106 Ground
102 Power supply 107 Power supply (to MPI Control Relay and ??)
103 Battery backup power supply (constant 12V) 108 Ignition switch - ST
104 Neutral safety switch (AT only, grounded in MTs) 109 Ignition pulse detect (tach)
105 Wastegate solenoid valve 110 Ignition switch - 1G
 
Pin Connection   Pin Connection
51 No. 1 Injector 60 No. 3 Injector
52 No. 2 Injector 61 No. 4 Injector
53 EGR Control Solenoid Valve (90-93 CA only, 94 all) 62 Purge control solenoid valve
54 Power transistor for #1 and #4 coils 63 MPI Control relay
55 Power transistor for #2 and #3 coils 64 Check engine light
56 MPI Control relay 65 Air conditioner relay
57 Fuel pressure control valve 66 MPI Control relay
58 Coil "A1" for idle speed control motor 67 Coil "B1" for idle speed control motor
59 Coil "A2" for idle speed control motor 68 Coil "B2" for idle speed control motor
 
Pin Connection   Pin Connection
1 Self-Diagnosis Output 13 Control relay (Fuel pump drive signal)
2 Diagnosis/Data transfer select terminal 14 Air flow sensor active filter reset (idle switch)
(switch with 6 if using a 91-94 ECU in a 90 or vvs)
Stock wire color - Green
3 Turbo gauge 15 EGR temperature sensor (90-93 CA only, 94 all)
4 Oxygen Sensor 16 Barometric pressure sensor (MAF)
5 Power steering oil pressure switch 17 Sensors ground
6 Idle position switch
(switch with 14 if using a 91-94 ECU in a 90 or vvs)
Stock wire color - Green/White
18 Vehicle speed sensor (reed switch)
7 Air conditioner switch 19 Throttle position sensor
8 Intake air temperature sensor (MAF) 20 Coolant temperature sensor
9 Detonation sensor 21 Crank angle sensor (RPM)
10 Air flow Sensor (MAF) 22 Top dead center sensor
11 ABS control unit (AWD, ABS only) 23 Power supply for MAF sensors (5volts)
12 Ignition timing adjustment connector 24 Sensors ground







1G ECU Pinouts, Vertical Layout
  Pin Connection   Pin Connection
12 Ignition timing adjustment connector 24 Sensors ground
11 ABS control unit (AWD, ABS only) 23 Power supply for MAF sensors (5volts)
10 Air flow Sensor (MAF) 22 Top dead center sensor
9 Detonation sensor 21 Crank angle sensor (RPM)
8 Intake air temperature sensor (MAF) 20 Coolant temperature sensor
7 Air conditioner switch 19 Throttle position sensor
6 Idle position switch
(switch with 14 if using a 91-94 ECU in a 90 or vvs)
Stock wire color - Green/White
18 Vehicle speed sensor (reed switch)
5 Power steering oil pressure switch 17 Sensors ground
4 Oxygen Sensor 16 Barometric pressure sensor (MAF)
3 Turbo gauge 15 EGR temperature sensor (90-93 CA only, 94 all)
2 Diagnosis/Data transfer select terminal 14 Air flow sensor active filter reset (idle switch)
(switch with 6 if using a 91-94 ECU in a 90 or vvs)
Stock wire color - Green
1 Self-Diagnosis Output 13 Control relay (Fuel pump drive signal)
 
Pin Connection   Pin Connection
59 Coil "A2" for idle speed control motor 68 Coil "B2" for idle speed control motor
58 Coil "A1" for idle speed control motor 67 Coil "B1" for idle speed control motor
57 Fuel pressure control valve 66 MPI Control relay
56 MPI Control relay 65 Air conditioner relay
55 Power transistor for #2 and #3 coils 64 Check engine light
54 Power transistor for #1 and #4 coils 63 MPI Control relay
53 EGR Control Solenoid Valve (90-93 CA only, 94 all) 62 Purge control solenoid valve
52 No. 2 Injector 61 No. 4 Injector
51 No. 1 Injector 60 No. 3 Injector
 
Pin Connection   Pin Connection
105 Wastegate solenoid valve 110 Ignition switch - 1G
104 Neutral safety switch (AT only, grounded in MTs) 109 Ignition pulse detect (tach)
103 Battery backup power supply (constant 12V) 108 Ignition switch - ST
102 Power supply 107 Power supply (to MPI Control Relay and ??)
101 Ground 106 Ground