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

Fig 1: Identifying PCM Inputs & Outputs Connector C Terminals (49P)
G05961231Courtesy of AMERICAN HONDA MOTOR CO., INC.
TERMINAL DESCRIPTION TABLE

Terminal number Wire color Terminal name Description Signal
1 BLK PGMETCS (POWER GROUND ETCS) Ground circuit for PCM Less than 0.2 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) (BANK 1, SENSOR 2) HEATER CONTROL 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 duty controlled
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 duty controlled
9 GRN/RED SHD (SHIFT SOLENOID VALVE D) Drives shift solenoid valve D With engine running in N, and in D and 2 during no lock-up condition: about 0 V With engine running in P and R, and in D 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 reference voltage With ignition switch ON (II): about 5.0 V
15 GRN/RED SG6 (SENSOR GROUND) Sensor ground Less than 0.2 V at all times
16 GRN/YEL SG2 (SENSOR GROUND) Sensor ground Less than 1.0 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 FWD) Detects transmission range switch FWD position signal In D, 2 and 1: about 0 V
In any position other than D, 2 and 1: battery voltage
19 RED/WHT ATPRVS (TRANSMISSION RANGE SWITCH RVS) Detects transmission range switch RVS 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, D (in 2nd and 3rd gears) and second: battery voltage
With engine running in P, N, D (in 1st, 4th and 5th gears), and 1: about 0 V
21 RED LSA (ATT CLUTCH PRESSURE CONTROL SOLENOID VALVE A) Drives A/T clutch pressure control solenoid valve A With ignition switch ON (II): current controlled
22 BLU/YEL POIL (ENGINE OIL PRESSURE SENSOR) Detects rocker arm oil pressure sensor signal With ignition switch ON (II): about 0.8 V (depending on engine oil pressure)
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
26 RED/BLK ATPN (TRANSMISSION RANGE SWITCH N) Detects transmission range switch N position signal input In N: about 0 V
In any position other than N: battery voltage
27 BLU/BLK OP2SW (2ND CLUTCH TRANSMISSION FLUID PRESSURE SWITCH) Detects transmission fluid pressure switch A (2nd clutch) signal With ignition switch ON (II):
  • Without 2nd clutch pressure: about 5.0 V
  • With 2nd clutch pressure: about 0 V
28 GRN/WHT SHB (SHIFT SOLENOID VALVE B) Drives shift solenoid valve B With engine running in P, R, N, 2, D (in 1st, 2nd and 5th gears): battery voltage
With engine running in D (in 3rd and 4th gears): about 0 V
30 BLU/YEL VCMSWB (ROCKER ARM OIL PRESSURE SWITCH B) Detects rear rocker arm oil pressure switch signal With ignition switch ON (II) or at idle: battery voltage
32 RED/WHT ECT1 (ENGINE COOLANT TEMPERATURE SENSOR (ECT) SENSOR 1) Detects ECT sensor 1 signal With ignition switch ON (II): about 0.1-4.8 V (depending on engine coolant temperature)
33 BLU/YEL ATFT (TATF 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)
34 WHT/BLK EGRP (EXHAUST GAS RECIRCULATION (EGR) VALVE POSITION SENSOR) Detects EGR valve position sensor signal With engine running: about 1.2-3.0 V (depending on EGR valve lift)
35 BRN ATP1 (TRANSMISSION RANGE SWITCH 1) Detects transmission switch 1 signal In 1: about 0 V
In any position other than 1: battery voltage
37 BLU/YEL OP4SW (4TH CLUTCH TRANSMISSION FLUID PRESSURE SWITCH) Detects 4th clutch transmission fluid pressure switch signal With ignition switch ON (II):
  • Without 4th clutch pressure: about 5.0 V
  • With 4th clutch pressure: about 0 V
38 BLU/WHT OP3SW (3RD CLUTCH TRANSMISSION FLUID PRESSURE SWITCH) Detects transmission fluid pressure switch B (3rd clutch) signal 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 (in 1st, 3rd and 5th gears), and 1: battery voltage With engine running in P, R, N, D (in 2nd and 4th gears), and D3 (in 2nd gear), and 2: 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 Less than 0.2 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: about 7.5 V (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)
46 BLU ATP2 (TRANSMISSION RANGE SWITCH 2) Detects transmission switch 2 signal input In 2: about 0 V
In any position other than 2: 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