## Fuel and Emissions System Description - Supplement

### PCM Inputs and Outputs at Connector A (31P)

NOTE: Standard battery voltage is 12 V.

Terminal number | Wire color | Terminal name | Description | Signal
--- | --- | --- | --- | ---
1 | BLK/WHT | PO2SHTC (PRIMARY HEATED OXYGEN SENSOR (PRIMARY HO2S) HEATER CONTROL) | Drives primary HO2S heater | With ignition switch ON (II): battery voltage With fully warmed up engine running: duty controlled
2 | YEL/BLK | IGP2 (POWER SOURCE) | Power source for the PCM circuit | With the ignition switch ON (II): battery voltage With the ignition switch OFF: about 0 V
3 | YEL/BLK | IGP1 (POWER SOURCE) | Power source for the PCM circuit | With the ignition switch ON (II): battery voltage With the ignition switch OFF: about 0 V
4 | BLK | PG2 (POWER GROUND) | Ground for the PCM circuit | Less than 0.1 V at all times
5 | BLK | PG1 (POWER GROUND) | Ground for the PCM circuit | Less than 0.1 V at all times
6 | WHT | PHO2S (PRIMARY HEATED OXYGEN SENSOR (PRIMARY HO2S) SENSOR 1) | Detects primary HO2S sensor (sensor 1) signal | With throttle fully opened from idle with fully warmed up engine: about 0.6 V With throttle quickly closed: below 0.4 V
7 | BLU | CKP (CRANKSHAFT POSITION SENSOR) | Detects CKP sensor signal | With engine running: pulses
9 | RED/BLU | KS (KNOCK SENSOR) | Detects knock sensor signal | With engine knocking: pulses With ignition switch ON (II): about 0 V
10 | GRN/BLK | SG2 (SENSOR GROUND) | Sensor ground | Less than 0.1 V at all times
11 | GRN/WHT | SG1 (SENSOR GROUND) | Sensor ground | Less than 0.1 V at all times
12 | BLK/BLU | IACV (IDLE AIR CONTROL (IAC) VALVE) | Drives IAC valve | With engine running: duty controlled
13 | WHT/BLK | EGRP (EXHAUST GAS RECIRCULATION (EGR) VALVE POSITION SENSOR) | Detects EGR valve position sensor signal | With engine running: 1.2 V-2.0 V (depending on EGR valve lift)
15 | RED/BLK | TPS (THROTTLE POSITION (TP) SENSOR) | Detects TP sensor signal | With throttle fully open: about 4.8 V With throttle fully closed: about 0.5 V

Terminal number | Wire color | Terminal name | Description | Signal
--- | --- | --- | --- | ---
16 | WHT/BLK | IGPLS3E (No. 3 REAR IGNITION COIL PULSE) | Drives No. 3 rear ignition coil | With ignition switch ON (II): about 0 V With engine running: pulses
18 | BLU/WHT | VABS (VEHICLE SPEED SIGNAL FROM ABS) | Input vehicle speed from ABS control unit | Depending on vehicle speed: pulses
19 | RED/GRN | MAP (MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR) | Detects MAP sensor signal | With ignition switch ON (II): about 3 V At idle: about 1.0 V (depending on engine speed)
20 | YEL/BLU | VCC2 (SENSOR VOLTAGE) | Provides sensor voltage | With ignition switch ON (II): about 5 V With ignition switch OFF: about 0 V
21 | YEL/RED | VCC1 (SENSOR VOLTAGE) | Provides sensor voltage | With ignition switch ON (II): about 5 V With ignition switch OFF: about 0 V
23 | BRN/BLK | LG2 (LOGIC GROUND) | Ground for the PCM circuit | Less than 0.1 V at all times
24 | BRN/BLK | LG1 (LOGIC GROUND) | Ground for the PCM circuit | Less than 0.1 V at all times
26 | GRN | TDC (TOP DEAD CENTER (TDC) SENSOR) | Detects DTC sensor | With engine running: pulses
27 | WHT/BLU | IGPLS4I (No. 4 FRONT IGNITION COIL PULSE) | Drives No. 4 front ignition coil | With ignition switch ON (II): about 0 V With engine running: pulses
28 | WHT/BLK | IGPLS3I (No. 3 FRONT IGNITION COIL PULSE) | Drives No. 3 front ignition coil
29 | WHT/GRN | IGPLS2I (No. 2 FRONT IGNITION COIL PULSE) | Drives No. 2 front ignition coil
30 | WHT | IGPLS1I (No. 1 FRONT IGNITION COIL PULSE) | Drives No. 1 front ignition coil

### PCM Inputs and Outputs at Connector B (24P)

NOTE: Standard battery voltage is 12 V.

Terminal number | Wire color | Terminal name | Description | Signal
--- | --- | --- | --- | ---
1 | WHT | IGPLS1E (No. 1 REAR IGNITION COIL PULSE) | Drives No. 1 rear ignition coil | With ignition switch ON (II): about 0 V With engine running: pulses
2 | YEL | INJ4 (No. 4 INJECTOR) | Drives No. 4 injector | With ignition switch ON (II): battery voltage At idle: duty controlled
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 | FANC (RADIATOR FAN CONTROL) | Drives radiator fan relay | With radiator fan running: about 0 V With radiator fan stopped: battery voltage
7 | GRN/WHT | HLCLS+ (CVT DRIVEN PULLEY CONTROL VALUE+ SIDE) | Drives CVT driven pulley control value | With ignition switch ON (II): pulsing signal
8 | RED/WHT | ECT (ENGINE COOLANT TEMPERATURE SENSOR) | Detects ECT sensor signal | With the ignition switch ON (II): about 0.1-4.8 V (depending on engine coolant temperature)
10 | WHT/GRN | IGPLS2E (No. 2 REAR IGNITION COIL PULSE | Drives No. 2 rear ignition coil | With ignition switch ON (II): about 0 V With engine running: pulses
11*1 | RED/WHT | M IND (M INDICATOR) | Drives M indicator light. | With M indicator light turned ON : about 6 V With M indicator light turned OFF : 0 V voltage
12*1 | LT GRN | S IND (S INDICATOR) | Drives S indicator light. | With S indicator light turned ON : about 6 V With S indicator light turned OFF : 0 V voltage
13 | WHT/RED | ALTF (ALTERNATOR FR SIGNAL) | Detects alternator FR signal | With engine running:about 0 V-5 V (depending on electrical load)
14 | PNK | EGR (EXHAUST GAS RECIRCULATION (EGR) VALVE) | Drives EGR valve | With EGR operating: duty controlled With EGR not operating: about 0 V
16 | YEL | SCLS+ (CVT START CLUTCH PRESSURE CONTROL VALVE + SIDE | Drives CVT start clutch pressure control valve | With ignition switch ON (II): pulsing signal
17 | RED/YEL | IAT (INTAKE AIR TEMPERATURE SENSOR) | Detects IAT sensor signal | With ignition switch ON (II): about 0.1 V-4.8 V (depending on intake air temperature)
18 | WHT/GRN | ALTC (ALTERNATOR CONTROL) | Sends alternator control signal | With engine running: about 0 V-5 V (depending on electrical load)
19*1 | LT GRN/RED | S-DN (DOWN SHIFT SWITCH) | Detects downshift switch signal | Steering shift switch pushed toward downshift position (marked with -): 0 V Steering shift switch in neutral position : about 5 V
20*1 | YEL | S-UP (UP SHIFT SWITCH) | Detects upshift switch signal | Steering shift switch pushed toward upshift position (marked with +): 0 V Steering shift switch in neutral position : about 5 V
21 | RED/YEL | PCS (EVAPORATIVE EMISSION (EVAP) CANISTER PURGE VALVE) | Drives EVAP canister purge valve | With engine running, engine coolant below 70°C (158°F): about 0 V With engine running, engine coolant above 70°C (158°F): duty controlled
22 | WHT/BLU | IGPLS4E (No. 4 REAR IGNITION COIL PULSE | Drives No. 4 rear ignition coil | With ignition switch ON (II): about 0 V With engine running: pulses
24 | BLU/WHT | SHLS+ (CVT DRIVE PULLEY CONTROL VALVE + SIDE) | Drives CVT drive pulley control valve | With ignition switch ON (II): duty controlled

*1: HONDA CVT +7SPEED MODE system

### PCM Inputs and Outputs at Connector C (22P)

NOTE: Standard battery voltage is 12 V.

Terminal number | Wire color | Terminal name | Description | Signal
--- | --- | --- | --- | ---
1 | PNK/BLK | HLCLS - (CVT DRIVEN PULLEY CONTROL VALVE - SIDE | Drives CVT driven pulley control valve |
6 | GRN/BLK | INHSOL (INHIBITOR SOLENOID CONTROL) | Drives inhibitor solenoid | With inhibitor solenoid ON: battery voltage With inhibitor solenoid OFF: 0 V
7 | RED/BLU | NDR (CVT DRIVE PULLEY SPEED SENSOR) | Detects CVT drive pulley speed sensor signal | With ignition switch ON (II): 0 V or 5 V
8 | PNK/BLU | SCLS- (CVT START CLUTCH PRESSURE CONTROL VALVE B-SIDE) | Drives CVT start clutch pressure control valve |
9 | BLU/WHT | ATPS (TRANSMISSION RANGE SWITCH S POSITION) | Drives transmission range switch S position signal | In S position: 0 V In any other position: about 5 V or battery voltage
10 | WHT | ATPR (TRANSMISSION RANGE SWITCH R POSITION) | Detects transmission range switch R position signal | In R position: 0 V In any other position: about 10 V
11 | BLU | ATPL (TRANSMISSION RANGE SWITCH L POSITION) | Detects transmission range switch L position signal | In L position: 0 V In any other position: about 10 V
12 | LT GRN | ATPNP (TRANSMISSION RANGE SWITCH NEUTRAL/PARK POSITION) | Detects transmission range switch Neutral/Park position signal | In Park or Neutral: 0 V In any other position: about 10 V
13*1 | YEL | MSW (MAIN SWITCH) | Detects main switch (7SPEED MODE) signal | Main switch (7SPPED MODE) pushed: 0 V Main switch (7SPPED MODE) released: about 5 V
15 | WHT | NDN (CVT DRIVEN PULLEY SPEED SENSOR) | Detects CVT driven pulley speed sensor signal | With ignition switch ON (II): 0 V or 5 V
16 | GRN/YEL | SHLS- (CVT DRIVE PULLEY CONTROL VALVE-SIDE) | Drives CVT drive pulley control valve | With ignition switch ON (II): pulses
20 | PNK | ATPD (TRANSMISSION RANGE SWITCH D POSITION) | Detects transmission range switch D position signal | In D position: about 0 V In any other position: about 5 V
22 | WHT/RED | VEL1 (CVT SPEED SENSOR) | Detects CVT speed sensor | Depending on vehicle speed: pulses When vehicle is stopped: about 0 V or about 5 V

*1: HONDA CVT +7SPEED MODE system

### PCM Inputs and Outputs at Connector E (31P)

NOTE: Standard battery voltage is 12 V.

Terminal number | Wire color | Terminal name | Description | Signal
--- | --- | --- | --- | ---
1 | GRN/YEL | IMO FPR (IMMOBILIZER FUEL PUMP RELAY) | Drives PGM-FI main relay 2 | 0 V for 2 seconds after turning ignition switch ON (II), then battery voltage
2*2 | WHT/RED | SHO2S (SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S), SENSOR 2) | Detects secondary HO2S (sensor 2) signal | With throttle fully opened from idle with fully warmed up engine: above 0.6 V With throttle quickly closed: below 0.4 V
3 | BRN/YEL | LG3 (LOGIC GROUND) | Ground for the PCM control circuit | Less than 0.1 V at all times
4 | PNK | SG3 (SENSOR GROUND) | Sensor ground | Less than 0.1 V at all times
5 | GRN/WHT | FUP (FUEL INJECTION SIGNAL) | Sends fuel injection signal to gauge assembly | With ignition switch ON (II): pulses
6*2 | BLK/WHT | SO2SHTC (SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S) HEATER CONTROL) | Drives secondary HO2S heater | With ignition switch ON (II): battery voltage With fully warmed up engine running: duty controlled
7 | RED/YEL | MRLY(PGM-FI MAIN RELAY) | Drives PGM-FI main relay 1 Power source for the DTC memory | With ignition switch ON (II): about 0 V With ignition switch OFF: battery voltage
8*1 | BLU/WHT | LED A | Drives shift indicator | In 7SPEED MODE: in 1st, 2nd, 3rd and 7th: about 0.3 V in 4th, 5th, and 6th: about 5 V
9 | YEL/BLK | IG1 (IGNITION SIGNAL) | Detects ignition signal | With ignition switch ON (II): battery voltage With ignition switch OFF: about 0 V
11 | PNK | DIND (D INDICATOR) | Drives D indicator light | With D indicator light turned ON: about 6 V With D indicator light turned OFF: 0 V
12 | BLU | TAC | Detects evaporator sensor signal | With ignition switch ON (II): about 0.1-4.8 V (depending on evaporator temperature)
15 | GRN/RED | ELD (ELECTRICAL LOAD DETECTOR (ELD)) | Detects ELD signal | With ignition switch ON (II): about 0.1-4.8 V (depending on electrical load)

*1: HONDA CVT +7SPEED MODE system

*2: KG, KE, KR models

Terminal number | Wire color | Terminal name | Description | Signal
--- | --- | --- | --- | ---
18 | RED | ACC (A/C CLUTCH RELAY) | Drives A/C clutch relay | With compressor ON: about 0 V With compressor OFF: battery voltage
20*1 | GRN/BLK | LED C | Drives shift indicator | In 7SPEED MODE: in 2nd, 4th, 6th and 7th: about 0.3 V in 1st, 3rd and 5th: about 5 V
21*1 | RED/WHT | LED B | Drives shift indicator | In 7SPEED MODE: in 1st, 4th, 5th and 7th: about 0.3 V in 2nd, 3rd and 6th: about 5 V
22 | WHT/BLK | BKSW (BRAKE PEDAL POSITION SWITCH) | Detects brake pedal position switch signal | With brake pedal released: about 0 V With brake pedal pressed: battery voltage
23 | RED/WHT | K-LINE | Sends and receives scan tool signal | With ignition switch ON (II): battery voltage
24 | GRN | MTRTW | Sends engine coolant temperture signal | With ignition switch ON (II): pulse
25 | BLU/YEL | VSSOUT (VEHICLE SPEED SENSOR (VSS) OUTPUT SIGNAL) | Sends vehicle speed sensor signal | Depending on vehicle speed: pulses
26 | BLU | NEP (ENGINE SPEED PULSE) | Outputs engine speed pulse | With engine running: pulses
27 | RED/BLU | IMOCD (IMMOBILIZER CODE) | Detects immobilizer signal |
28 | BLU/WHT | ACS (A/C SWITCH SIGNAL) | Detects A/C switch signal | With A/C switch ON: 0 V With A/C switch OFF: about 5 V
29 | BRN | SCS (SERVICE CHECK SIGNAL) | Detects service check signal | With the service check signal shorted with the PGM Tester: about 0 V With the service check signal opened: about 5 V
31 | GRN/ORN | MIL (MALFUNCTION INDICATOR LAMP) | Drives MIL | With MIL turned ON: about 0 V With MIL turned OFF: battery voltage

*1: HONDA CVT +7SPEED MODE system

### PCM Circuit Diagram

PCM Circuit Diagram (cont'd)

PCM Circuit Diagram (cont'd)

PCM Circuit Diagram (cont'd)

PCM Circuit Diagram (cont'd)

PCM Circuit Diagram (cont'd)

PCM Circuit Diagram (cont'd)

PCM Circuit Diagram (cont'd)
LHD model:

PCM Circuit Diagram (cont'd)
LHD model:

PCM Circuit Diagram (cont'd)
LHD model:

PCM Circuit Diagram (cont'd)
RHD model:

PCM Circuit Diagram (cont'd)
RHD model:

PCM Circuit Diagram (cont'd)
RHD model: