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PCM Inputs and Outputs at Connector C (◦) (49P)

Fig 1: Identifying PCM Inputs And Outputs Connector
G05484923Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE: Standard battery voltage is about 12 V.
VOLTAGE REFERENCE CHART

Terminal number Wire color Terminal name Description Signal
1 BLK PGMETCS (POWER GROUND ETCS) Ground circuit for PCM circuit Less than 0.5 V at all times
2 BLU ETCSM + (THROTTLE ACTUATOR + SIDE) Drives throttle actuator With ignition switch ON (II): about 0 V
3 GRN ETCSM - (THROTTLE ACTUATOR - SIDE) Ground for throttle actuator With ignition switch ON (II): about 0 V
4 YEL/GRN IG1 ETCS (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


Fig 1: Identifying PCM Inputs And Outputs Connector
G05484924Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE: Standard battery voltage is about 12 V.
VOLTAGE REFERENCE CHART

Terminal number Wire color Terminal name Description Signal
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 GRN/RED SHD (SHIFT SOLENOID VALVE D) Drives shift solenoid valve D With engine running in N, and in D and D3 during no lock-up condition: about 0 V
With engine running in P and R, and in D and D3 during lock-up condition: battery voltage
10 BLU/RED EGR (EXHAUST GAS RECIRCULATION (EGR) VALVE) Drives EGR valve With EGR operating: duty controlled
With EGR not operating: about 0 V
11 YEL/BLU VCC6 (SENSOR VOLTAGE) Provides sensor reference voltage With ignition switch ON (II): about 5.0 V
12 YEL/BLU VCC2 (SENSOR VOLTAGE) Provides sensor voltage With ignition switch ON (II): about 5.0 V
15 GRN/YEL SG6 (SENSOR GROUND) Sensor ground Less than 0.5 V at all times


Fig 1: Identifying PCM Inputs And Outputs Connector
G05484925Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE: Standard battery voltage is about 12 V.
VOLTAGE REFERENCE CHART

Terminal number Wire color Terminal name Description Signal
16 GRN/YEL SG2 (SENSOR GROUND) Sensor ground Less than 0.5 V at all times
17 YEL/GRN ATPD (TRANSMISSION RANGE SWITCH D) Detects transmission range switch D position signal input In D: about 0 V
In any position other than D: battery voltage
18 BLU/YEL ATPFWD (TRANSMISSION RANGE SWITCH D/D3 POSITION) Detects transmission range switch D, D3 position signal In D and D3: about 0 V
In any position other than D and D3: battery voltage
19 RED/WHT ATPRVS (TRANSMISSION RANGE SWITCH R POSITION) Detects transmission range switch P, R, N position signal input In P, R, and N: about 0 V
In any position other than P, R, and N: battery voltage
20 BLU/YEL. SHA (SHIFT SOLENOID VALVE A) Drives shift solenoid valve A With engine running in R, and in D3 and D (in 2nd, and 3rd gears): battery voltage
With engine running in P and N, D, and D3 (in 1st gear), and D (4th arid 5th gears): about 0 V
21 RED LSA (A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A) Drives A/T clutch pressure control solenoid valve A With ignition switch ON (II): current controlled
24 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)
25 WHT ATPR (TRANSMISSION RANGE SWITCH R) Detects transmission range switch R position signal input In R: about 0 V
In any position other than R: battery voltage


Fig 1: Identifying PCM Inputs And Outputs Connector
G05484927Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE: Standard battery voltage is about 12 V.
VOLTAGE REFERENCE CHART

Terminal number Wire color Terminal name Description Signal
38 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 5.0 V
  • With 3rd clutch pressure: about 0 V
39 GRN SHC (SHIFT SOLENOID VALVE C) Drives shift solenoid valve C With engine running in D and D3 (in 1st and 3rd gears), D (in 5th gear): battery voltage
With engine running in P, R, and N, D, and D3 (2nd gear), arid D (4th gears): about 0 V
40 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
41 BRN/YEL LG1 (LOGIC GROUND) Ground circuit for PCM circuit Less than 0.5 V at all times
42 WHT/BLU ALTL (ALTERNATOR L SIGNAL) Detects alternator L signal With ignition switch ON (II): about 0 V
With engine running: battery voltage
43 WHT/GRN ALTC (ALTERNATOR CONTROL) Sends alternator control signal With fully warmed up engine running battery voltage (depending on electrical load)
44 WHT/RED ALTF (ALTERNATOR FR SIGNAL) Detects alternator FR signal With engine running: about 0-5.0 V (depending on electrical load)
45 BLU/YEL OPSW (OIL PRESSURE SWITCH) Detects engine oil pressure signal With ignition switch ON (II): about 0 V
With engine running: battery voltage


Fig 1: Identifying PCM Inputs And Outputs Connector
G05484928Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE: Standard battery voltage is about 12 V.
VOLTAGE REFERENCE CHART

Terminal number Wire color Terminal name Description Signal
46 RED ATPD3 (TRANSMISSION RANGE SWITCH D3) Detects transmission switch D3 signal input In D3: about 0 V
In any position other than D3: battery voltage
47 RED/BLU KS (KNOCK SENSOR) Detects knock sensor signal With engine knocking: pulses
48 WHT/BLU IMT + (INTAKE MANIFOLD TUNING (IMT) ACTUATOR + SIDE) Drives IMT actuator With ignition switch ON (II): battery voltage
49 WHT/RED IMT - (INTAKE MANIFOLD TUNING (IMT) ACTUATOR - SIDE) Drives IMT actuator With ignition switch ON (II): battery voltage
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