ECM/PCM Inputs and Outputs at Connector B (24P)
NOTE: Standard battery voltage is 12 V.

Terminal number | Wire color | Terminal name | Description | Signal
--- | --- | --- | --- | ---
1 | BLU/WHT | VTC (VTC OIL CONTROL SOLENOID VALVE) | Drives VTC oil control solenoid valve | With ignition switch ON (II): 0 V
2 | YEL | INJ4 (No. 4 INJECTOR) | Drives No. 4 injector | At idle: duty controlled With ignition switch ON (II): battery voltage
3 | BLU | INJ3 (No. 3 INJECTOR) | Drives No. 3 injector
4 | RED | INJ2 (No. 2 INJECTOR) | Drives No. 2 injector
5 | BRN | INJ1 (No. 1 INJECTOR) | Drives No. 1 injector
6 | GRN/YEL | VTS (VTEC SOLENOID VALVE) | Drives VTEC solenoid valve | At idle: about 0 V
8 | RED/WHT | ECT (ENGINE COOLANT TEMPERATURE SENSOR) | Detects ECT sensor signal | With ignition switch ON (II): about 0.1−4.8 V (depending on engine coolant temperature) With fully warmed up engine: about 0.5−0.7 V
10 | WHT/BLU | ALTL (ALTERNATOR L SIGNAL) | Detects alternator signal | With ignition switch ON (II): about 0 V With engine running: battery voltage
11 *3 | BLU/BLK | VTPSW (VTEC OIL PRESSURE SWITCH) | Detects VTEC oil pressure switch signal | With engine at low engine speed: about 0 V With engine at high engine speed: battery voltage
12 *1 | WHT/BLK | EGRP (EXHAUST GAS RECIRCULATION (EGR) VALVE POSITION SENSOR)) | Detects EGR valve position sensor signal | With engine running: 1.2−3.0 V (depending on EGR valve lift)
13 | WHT/RED | ALTF (ALTERNATOR FR SIGNAL) | Detects alternator FR signal | With engine running: about 0−5 V (depending on electrical load)
15 | BLU/YEL | MCS (ENGINE MOUNT CONTROL SOLENOID VALVE) | Drives engine mount control solenoid valve | At idle: about 0 V Above idle: battery voltage With ignition switch ON (II): battery voltage
16 *1 | BLU/RED | EGR (EXHAUST GAS RECIRCULATION (EGR) VALVE) | Drives EGR valve | With EGR operating: duty controlled With EGR not operating: about 0 V
17 | RED/YEL | IAT (INTAKE AIR TEMPERATURE SENSOR) | Detects IAT sensor signal | With ignition switch ON (II): about 0.1−4.8 V (depending on intake air temperature)
18 | WHT/GRN | ALTC (ALTERNATOR CONTROL) | Sends alternator control signal | With engine running: and fully warmed up: about 8 V
19 *2 | GRN | SEFD (THROTTLE ACTUATOR CONTROL SERIAL SIGNAL) | Sends throttle actuator control serial signal |
20 *2 | BLU | SEDF (THROTTLE ACTUATOR CONTROL SERIAL SIGNAL) | Detects throttle actuator control serial signal |
21 | YEL/BLU | PCS (EVAPORATIVE EMISSION CANISTER PURGE VALVE) | Drives EVAP canister purge valve | With engine running, engine coolant below 65 °C (149 °F): battery voltage With engine running, engine coolant above 65 °C (149 °F): duty controlled

*1: | K20A6 engine
*2: | K24A3 engine
*3: | Except KQ model