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PCM Inputs and Outputs at Connector C (O) (44P)

Fig 1: Identifying PCM Connector C Terminals
G04545849Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE: Standard battery voltage is 12 V.
TERMINALS DESCRIPTION CHART

Terminal number Wire color Terminal name Description Signal
1 BLK PGMETCS (POWER GROUND ETCS) Ground circuit for PCM circuit Less than 1.0 V at all times
2 BLU ETCSM+ (THROTTLE ACTUATOR +SIDE) Drives throttle actuator With ignition switch ON (II): 0 V
3 GRN ETCSM- (THROTTLE ACTUATOR-SIDE) Ground for throttle actuator With ignition switch ON (II): 0 V
4 YEL/GRN IG1ETCS (IGNITION SIGNAL ETCS) Detects ignition signal With ignition switch ON (II): battery voltage
5 BLK/WHT SO2SHTCB1 (REAR SECONDARY HEATED OXYGEN SENSOR (REAR SECONDARY HO2S) HEATER) Drives rear secondary HO2S heater (Bank 1, sensor 2) With ignition switch ON (II): battery voltage With fully warmed up engine running: duty controlled
6 BLK/WHT AFSHTCB1 (REAR AIR FUEL RATIO (REAR A/F) SENSOR HEATER CONTROL BANK 1, SENSOR 1) Drives rear A/F sensor heater (Bank 1, sensor 1) With ignition switch ON (II): battery voltage
With fully warmed up engine running: about 0 V or pulses
7 GRN/RED SO2SHTCB2 (FRONT SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S) HEATER) Drives front secondary HO2S heater (Bank 2, sensor 2) With ignition switch ON (II): battery voltage
With fully warmed up engine running: duty controlled
8 GRN/WHT AFSHTCB2 (FRONT AIR FUEL RATIO (FRONT A/F) SENSOR HEATER CONTROL BANK 2, SENSOR 1) Drives front A/F sensor heater (Bank 2, sensor 1) With ignition switch ON (II): battery voltage
With fully warmed up engine running: about 0 V or pulses
9 BLU/RED EGR (EXHAUST GAS RECIRCULATION (EGR) VALVE) Drives EGR valve With EGR operating: duty controlled
With EGR not operating: about 0 V
10 WHT VLBLB1 (LABEL RESISTER BANK 1) Detects rear A/F sensor (Bank 1, sensor 1) LABEL signal With engine running: 0.4-4.6 V
11 WHT/RED VLBLB2 (LABEL RESISTER BANK 2) Detects front A/F sensor (Bank 2, sensor 1) LABEL signal With engine running: 0.4-4.6 V
13 YEL/BLU VCC2 (SENSOR VOLTAGE) Provides sensor voltage Ignition switch ON (II): about 5 V
14 GRN/YEL SG2 (SENSOR GROUND) Sensor ground Less than 1.0 V at all times
15 BLU/WHT OP3SW (3RD CLUTCH TRANSMISSION FLUID PRESSURE SWITCH) Detects 3rd clutch transmission fluid pressure switch input With ignition switch ON (II):
  • Without 3rd clutch pressure: about 5 V
  • With 3rd clutch pressure: about 0 V
16 BLU/YEL OP4SW (4TH CLUTCH TRANSMISSION FLUID PRESSURE SWITCH) Detects 4th clutch transmission fluid pressure switch input With ignition switch ON (II):
  • Without 4th clutch pressure: about 5 V
  • With 4th clutch pressure: about 0 V
17 BLU/YEL ATPFWD (TRANSMISSION RANGE SWITCH D/2 POSITION) Detects transmission range switch D, 2 position signal In D, D3 and 2 position: about 0 V
In any other position: battery voltage
18 GRN SHC (SHIFT SOLENOID VALVE C) Drives shift solenoid valve C Battery voltage in these position:
  • 1
  • D and D3 in 1st, 3rd, and 5th gear 0 V in these positions:
  • 2
  • D and D3 in 2nd gear
  • D in 4th gear
19 RED LSA (A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A) Drives A/T clutch pressure control solenoid valve A With ignition switch ON (II): pulsing signal
20 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)
23 GRN/WHT SHB (SHIFT SOLENOID VALVE B) Drives shift solenoid valve B Battery voltage in these positions:
  • 2 and 1
  • D, and D3 in 1st, 2nd, and 3rd gear
  • P, R, and N 0 V in these positions:
  • D in 4th and 5th gear
24 GRN/YEL VTS (VTEC SOLENOID VALVE) Drives VTEC solenoid valve At idle: about 0 V
25 BLU/YEL SHA (SHIFT SOLENOID VALVE A) Drives shift solenoid valve A Battery voltage in these positions:
  • 2 and 1
  • D, and D3 in 1st and 2nd gear
  • D in 5th gear 0 V in these positions:
  • D and D3 in 3rd gear
  • D in 4th gear
  • P, R, and N
26 RED/YEL IAT (INTAKE AIR TEMPERATURE (IAT) SENSOR) Detects IAT sensor signal With ignition switch ON (II): about 0.1-4.8 V (depending on intake air temperature)
27 RED/WHT ECT1 (ENGINE COOLANT TEMPERATURE (ECT) SENSOR 1) Detects ECT sensor 1 signal With ignition switch ON (II): about 0.1-4.8 V (depending on engine coolant temperature)
28 BLU/YEL ATFT (ATF TEMPERATURE SENSOR) Detects ATF temperature signal With ignition switch ON (II): about 0.2-4.0 V (about 1.8 V at operating temperature) (depending on ATF temperature)
30 WHT ATPR (TRANSMISSION RANGE SWITCH R) Detects transmission range switch R position signal input In the R position: 0 V
In any other position: battery voltage
31 RED/BLK ATPN (TRANSMISSION RANGE SWITCH NEUTRAL) Detects transmission range switch N position signal input In the N position: 0 V
In any other position: battery voltage
32 YEL ATPD (TRANSMISSION RANGE SWITCH D) Detects transmission range switch D position signal input In the D position: 0 V
In any other position: battery voltage
33 RED ATPD3 (TRANSMISSION RANGE SWITCH D3) Detects transmission switch D3 signal input In the D3 position: 0 V
In other than the D3 position: battery voltage
34 BLU ATP2 (TRANSMISSION RANGE SWITCH 2) Detects transmission switch 2 signal input In the 2 position: 0 V
In any other position: battery voltage
35 BRN ATP1 (TRANSMISSION RANGE SWITCH 1) Detects transmission switch 1 signal input In the 1 position: 0 V
In other than the 1 position: battery voltage
36 GRN/RED ECT2 (ENGINE COOLANT TEMPERATURE (ECT) SENSOR 2) Detects ECT sensor 2 signal With ignition switch ON (II): about 0.1-4.8 V (depending on engine coolant temperature)
37 RED/YEL PCS (EVAPORATIVE EMISSION (EVAP) CANISTER PURGE VALVE) Drives EVAP canister purge valve With engine running, engine coolant below 140°F (60°C): battery voltage
With engine running, engine coolant above 140°F (60°C): duty controlled
38 WHT/GRN ALTC (ALTERNATOR CONTROL) Sends alternator control signal With engine running and fully warmed up: battery voltage (depending on electrical load)
39 GRN/YEL SG6 (SENSOR GROUND) Sensor ground Less than 1.0 V at all times
40 BRN/YEL LG1 (LOGIC GROUND) Ground circuit for PCM circuit Less than 1.0 V at all times
41 WHT/RED ALTF (ALTERNATOR FR SIGNAL) Detects alternator FR signal With engine running: 0-5 V (depending on electrical load)
42 RED/BLU KS (KNOCK SENSOR) Detects knock sensor signal With engine knocking: pulses
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