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

Fig 1: Identifying PCM Connector C (49P) Terminals
G08078953Courtesy of AMERICAN HONDA MOTOR CO., INC.
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 LT 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 BRN IG1ETCS (IGNITION SIGNAL ETCS) Detects ignition signal With ignition switch ON (II): battery voltage
5 PUR SO2SHTCB1 (REAR SECONDARY HEATED OXYGEN SENSOR (REAR SECONDARY HO2S) (BANK 1, SENSOR 2) HEATER CONTROL) Drives rear secondary HO2S (Bank 1, sensor 2) heater With ignition switch ON (II): battery voltage With warmed up engine running: duty controlled
6 TAN AFSHTCB1 (REAR AIR FUEL RATIO (REAR A/F) SENSOR (BANK 1, SENSOR 1) HEATER CONTROL) Drives rear A/F sensor (Bank 1, sensor 1) heater With ignition switch ON (II): battery voltage With warmed up engine running: about 0 V or duty controlled
7 YEL SO2SHTCB2 (FRONT SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S) (BANK 2, SENSOR 2) HEATER CONTROL) Drives front secondary HO2S (Bank 2, sensor 2) heater With ignition switch ON (II): battery voltage With warmed up engine running: duty controlled
8 GRY AFSHTCB2 (FRONT AIR FUEL RATIO (FRONT A/F) SENSOR (BANK 2, SENSOR 1) HEATER CONTROL) Drives front A/F sensor (Bank 2, sensor 1) heater With ignition switch ON (II): battery voltage With warmed up engine running: about 0 V or duty controlled
9 PUR 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 LT BLU EGR (EXHAUST GAS RECIRCULATION (EGR) VALVE) Drives EGR valve With EGR operating: duty controlled Without EGR operating: about 0 V
11 RED VCC6 (SENSOR VOLTAGE) Provides sensor reference voltage With ignition switch ON (II): about 5.0 V
12 TAN VCC2 (SENSOR VOLTAGE) Provides sensor reference voltage With ignition switch ON (II): about 5.0 V
16 GRY SG2 (SENSOR GROUND) Sensor ground Less than 0.2 V at all times
17 LT GRN ATPD (TRANSMISSION RANGE SWITCH D) Detects transmission range switch D position signal In D: about 0 V In any position other than D: about 5.0 V
18 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: about 5.0 V
19 PNK ATPRVS (TRANSMISSION RANGE SWITCH RVS) Detects transmission range switch RVS position signal In P, R, and N: about 0 V In any position other than P, R, and N: about 5.0 V
20 BLU SHA (SHIFT SOLENOID VALVE A) Drives shift solenoid valve A With engine running in R, D (in 2nd and 3rd gears), and 2: battery voltage With engine running in P, N, D (in 1st, 4th and 5th gears) and 1: 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
22 PUR 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)
23 YEL SO2SGB1 (REAR SECONDARY HEATED OXYGEN SENSOR (REAR SECONDARY HO2S (BANK 1, SENSOR 2)) SENSOR GROUND) Sensor ground for rear secondary HO2S (Bank 1, sensor 2) With ignition switch ON (II): about 1.5 V
24 RED 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 In R: about 0 V In any position other than R: more than 5.0 V
26 PUR ATPN (TRANSMISSION RANGE SWITCH N) Detects transmission range switch N position signal In N: about 0 V In any position other than N: battery voltage
27 LT GRN OP2SW (TRANSMISSION FLUID PRESSURE SWITCH A (2ND CLUTCH)) Detects transmission fluid pressure switch A (2nd clutch) signal With ignition switch ON (II):
  • Without 2nd clutch pressure: battery voltage
  • With 2nd clutch pressure: about 0 V
28 TAN SHB (SHIFT SOLENOID VALVE B) Drives shift solenoid valve B With engine running in P, R, N, D (in 1st, 2nd, and 5th gears), 2, and 1: battery voltage With engine running in D (in 3rd and 4th gears): about 0 V
30 BLU 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 PNK 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 GRN TATF (ATF TEMPERATURE SENSOR) Detects ATF temperature sensor signal With ignition switch ON (II): about 0.2-4.0 V (about 1.8 V at operating temperature, depending on ATF temperature)
34 PUR 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 range switch 1 position signal In 1: about 0 V In any position other than 1: about 5.0 V
36 WHT SO2SGB2 (FRONT SECONDARY HEATED OXYGEN SENSOR (FRONT SECONDARY HO2S (BANK 2, SENSOR 2)) SENSOR GROUND) Sensor ground for front secondary HO2S (Bank 2, sensor 2) With ignition switch ON (II): about 1.5 V
37 BLU OP4SW (TRANSMISSION FLUID PRESSURE SWITCH C (4TH CLUTCH)) Detects transmission fluid pressure switch C (4th clutch) signal With ignition switch ON (II):
  • Without 4th clutch pressure: battery voltage
  • With 4th clutch pressure: about 0 V
38 LT BLU OP3SW (TRANSMISSION FLUID PRESSURE SWITCH B (3RD CLUTCH)) Detects transmission fluid pressure switch B (3rd clutch) signal With ignition switch ON (II):
  • Without 3rd clutch pressure: battery voltage
  • 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), D3 (in 2nd gear), and 2: about 0 V
40 RED 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 LG1 (LOGIC GROUND) Ground circuit for PCM Less than 0.2 V at all times
42 BLU ALTL (ALTERNATOR L SIGNAL) Detects alternator L signal With ignition switch ON (II): about 0 V With engine running: battery voltage
43 GRN ALTC (ALTERNATOR CONTROL) Sends alternator control signal With warmed up engine running: about 7.5 V (depending on electrical load)
44 RED ALTF (ALTERNATOR FR SIGNAL) Detects alternator FR signal With engine running: about 0-5.0 V (depending on electrical load)
46 RED ATP2 (TRANSMISSION RANGE SWITCH 2) Detects transmission range switch 2 position signal In 2: about 0 V In any position other than 2: about 5.0 V
47 BLU KS(KNOCK SENSOR) Detects knock sensor signal With engine knocking: pulses
48 WHT IMT+ (INTAKE MANIFOLD TUNING (IMT) ACTUATOR + SIDE) Drives IMT actuator With ignition switch ON (II): battery voltage
49 BLU IMT - (INTAKE MANIFOLD TUNING (IMT) ACTUATOR - SIDE) Drives IMT actuator With ignition switch ON (II): battery voltage