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ECU Plug '89-91 JDM SiR '90-1 US Integra 88-91 US Civic/CRX Si or HF 

88-89 US Integra

 88-91 US Civic/CRX DX or Std. 85-7 US Civic/CRX Si 

86-87 US Integra
A1 #1 injector #1 injector #1 injector Aux injector #1 injector
A2 Ground Ground Ground Ground Ground
A3 #2 injector #2 injector #2 injector Aux injector #2 injector
A4 Ground Ground Ground Ground Ground
A5 #3 injector #3 injector #3 injector Main injector #3 injector
A6 Ground Ground Ground Ground Ground
A7 #4 injector #4 injector #4 injector Main injector #4 injector
A8 VTEC solenoid - - Lock-up control solenoid valve (AT) -
A9 - - - - -
A10 Pressure regulator cut-off solenoid valve Pressure regulator cut-off solenoid valve EGR activation (HF) - -
A11 EACV EACV EACV EACV Idle control solenoid (Civic) EACV (Integra) 
A12 Main relay Main relay Main relay Main relay Main relay
A13 Main relay Main relay Main relay Main relay Main relay
A14 Main relay Main relay Main relay Main relay Main relay
A15 Main relay Main relay Main relay Main relay Main relay
A16 Ground Ground Ground Ground Ground
A17 - - - - -
A18 Ground Ground Ground Ground Ground
- - - - - -
B1 Hazard fuse Hazard fuse Hazard fuse Hazard fuse -
B2 - - Shift up indicator (HF) Dashpot valve(Si) Tandem valve -
B3 A/C clutch relay A/C clutch relay A/C clutch relay A/C clutch relay -
B4 - - - - -
B5 VTEC pressure switch - Alternator Alternator -
B6 Check engine light Check engine light Check engine light Check engine light Check engine light
B7 - - Heater fan switch (HF) - -
B8 A/C switch A/C switch A/C switch A/C switch -
B9 - - Reverse switch (HF) - -
B10 Crank angle sensor Crank angle sensor Crank angle sensor - -
B11 Traces to fuse box - Clutch switch (HF) - -
B12 Crank angle sensor Crank angle sensor Crank angle sensor - -
B13 Ignition switch Ignition switch Ignition switch Ignition switch Ignition switch
B14 Alternator Alternator Alternator Alternator Alternator
B15 Igniter Igniter Igniter Igniter -
B16 Speed sensor Speed sensor Speed sensor Speed sensor -
B17 Igniter Igniter Igniter Igniter -
B18 - - - - -
B19 Knock sensor P/S oil pressure switch Electronic load detector Electronic load detector -
B20 Ignition timing adjusting connector Ignition timing adjusting connector Ignition timing adjusting connector Ignition timing adjusting connector Idle mixture adjuster sensor
C1 Cylinder sensor Cylinder sensor Cylinder sensor Crank angle sensor Crank angle sensor
C2 Cylinder sensor Cylinder sensor Cylinder sensor Crank angle sensor Crank angle sensor
C3 TDC TDC TDC TDC TDC
C4 TDC TDC TDC TDC TDC
C5 Intake air temperature sensor (TA) Intake air temperature sensor (TA) Intake air temperature sensor (TA) Intake air temperature sensor (TA) Intake air temperature sensor (TA)
C6 TW sensor TW sensor TW sensor TW sensor TW sensor
C7 Throttle angle sensor Throttle angle sensor Throttle angle sensor Throttle angle sensor Throttle angle sensor
C8 O2 sensor - EGR sensor (HF) - -
C9 PA sensor PA sensor PA sensor PA sensor PA sensor
C10 Brake switch Brake switch      
C11 MAP sensor MAP sensor MAP sensor MAP sensor MAP sensor
C12 Sensor ground Sensor ground Sensor ground Sensor ground Sensor ground
C13 Sensor signal voltage  Sensor signal voltage  Sensor signal voltage  Sensor signal voltage  Sensor signal voltage 
C14 MAP sensor MAP sensor MAP sensor MAP sensor MAP sensor
C15 MAP sensor MAP sensor MAP sensor MAP sensor MAP sensor
C16 O2 sensor O2 sensor O2 sensor O2 sensor O2 sensor
- - -