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

Fig 1: Identifying PCM Connector C (◦) (49P) Terminal Identification
G07361783Courtesy of AMERICAN HONDA MOTOR CO., INC.
CONNECTOR TERMINALS REFERNCE CHART

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 IG1 ETCS (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
CONNECTOR TERMINALS REFERNCE CHART

Terminal number Wire color Terminal name Description Signal
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 GRN SHC (SHIFT SOLENOID VALVE C) Drives shift solenoid valve C With engine running in N, and in D and S during no lock-up condition: about 0 V
With engine running in P and R, and in D and S during lock-up condition: battery voltage
10 LT GRN EGR (EXHAUST GAS RECIRCULATION (EGR) VALVE) Drives EGR valve With EGR operating: duty controlled
With EGR not operating: about 0 V
11 PUR Not used Not used  
12 TAN VCC2 (SENSOR VOLTAGE) Provides sensor reference voltage With ignition switch ON (II): about 5.0 V
14 LT BLU OP5SW (TRANSMISSION FLUID PRESSURE SWITCH D (5TH CLUTCH)) Detects transmission fluid pressure switch D (5th clutch) With engine running
  • Without 5th clutch pressure: about 5.0 V
  • With 5th clutch pressure: about 0 V
15 GRN Not used Not used  
16 GRY SG2 (SENSOR GROUND) Sensor ground Less than 0.2 V at all times
Fig 2: Identifying PCM Connector C (◦) (49P) Terminal Identification
G07361785Courtesy of AMERICAN HONDA MOTOR CO., INC.
CONNECTOR TERMINALS REFERNCE CHART

Terminal number Wire color Terminal name Description Signal
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: battery voltage
18 YEL ATPFWD (TRANSMISSION RANGE SWITCH FWD) Detects transmission range switch FWD signal In D and S: about 0 V
In any position other than D and S: battery voltage
19 PNK ATPRVS (TRANSMISSION RANGE SWITCH RVS) Detects transmission range switch RVS signal In R: about 0 V
In any position other than R: battery voltage
20 BLU SHA (SHIFT SOLENOID VALVE A) Drives shift solenoid valve A With engine running in P, N, D (in 1st and 2nd gears), and S (in 1st and 2nd gears): battery voltage
With engine running in R, D (in 3rd, 4th, 5th, and 6th gears), and S (in 3rd, 4th, 5th, and 6th 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
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 LT GRN 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: battery voltage
Fig 3: Identifying PCM Connector C (◦) (49P) Terminal Identification
G07361786Courtesy of AMERICAN HONDA MOTOR CO., INC.
CONNECTOR TERMINALS REFERNCE CHART

Terminal number Wire color Terminal name Description Signal
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) With engine running
  • Without 2nd clutch pressure: about 5.0 V
  • With 2nd clutch pressure: about 0 V
28 TAN SHB (SHIFT SOLENOID VALVE B) Drives shift solenoid valve B With engine running in D (1st, 2nd, and 3rd gears) and S (1st 2nd, and 3rd gears): battery voltage
With engine running in P, R, N, D (4th, 5th, and 6th gears), and S (4th, 5th, and 6th gears): about 0 V
31 WHT OP6SW (TRANSMISSION FLUID PRESSURE SWITCH E (6TH CLUTCH)) Detects transmission fluid pressure switch E (6th clutch) With engine running
  • Without 6th clutch pressure: about 5.0 V
  • With 6th clutch pressure: about 0 V
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 signal With ignition switch ON (II): about 0.2-4.0 V (about 1.8 V at operating temperature, depending on ATF temperature)
Fig 4: Identifying PCM Connector C (◦) (49P) Terminal Identification
G07361787Courtesy of AMERICAN HONDA MOTOR CO., INC.
CONNECTOR TERMINALS REFERNCE CHART

Terminal number Wire color Terminal name Description Signal
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 OPPLSW (LINE PRESSURE SWITCH) Detects line pressure switch signal With engine running
  • With low line pressure: about 5.0 V
  • Without low line pressure: about 0 V
36 GRN SO2SGB2 (FRONT SECONDARY HEATED OXYGEN SENSOR (FRONT SECONDARY HO2S (BANK2, 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) With engine running
  • Without 4th clutch pressure: about 5.0 V
  • 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) With engine running
  • Without 3rd clutch pressure: about 5.0 V
  • With 3rd clutch pressure: 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
Fig 5: Identifying PCM Connector C (◦) (49P) Terminal Identification
G07361788Courtesy of AMERICAN HONDA MOTOR CO., INC.
CONNECTOR TERMINALS REFERNCE CHART

Terminal number Wire color Terminal name Description Signal
42 YEL 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)
45 BLU OPSW (OIL PRESSURE SWITCH) Detects engine oil pressure signal With ignition switch ON (II): battery voltage
With engine running: about 0 V
46 RED ATPS (TRANSMISSION RANGE SWITCH S) Detects transmission switch S position signal In S: about 0 V
In any position other than S: battery voltage
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 PUR IMT- (INTAKE MANIFOLD TUNING (IMT) ACTUATOR -SIDE) Drives IMT actuator With ignition switch ON (II): battery voltage
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