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ECM/PCM inputs and Outputs at ECM/PCM Connector C (◦) (49P)

Fig 1: Identifying ECM/PCM Inputs And Outputs At ECM/PCM Connector C (◦) (49P) Terminals
G08069273Courtesy of AMERICAN HONDA MOTOR CO., INC.
Terminal number Wire color Terminal name Description Signal
1 BLK PGMETCS (POWER GROUND ETCS) Ground circuit for ECM/PCM Less than 0.2 V at all times
2 BLU ETCSM+ (THROTTLE ACTUATOR +SIDE) Drives throttle actuator With ignition switch ON (II)/vehicle in ON mode: about 0 V
3 GRN ETCSM- (THROTTLE ACTUATOR -SIDE) Ground for throttle actuator With ignition switch ON (II)/vehicle in ON mode: about 0 V
4 YEL/GRN IG1ETCS (IGNITION SIGNAL ETCS) Detects ignition signal With ignition switch ON (II)/vehicle in ON mode: battery voltage
5 BLK/WHT 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)/vehicle in ON mode: battery voltage
With warmed up engine running: duty controlled
6 BLK/WHT 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)/vehicle in ON mode: battery voltage
With warmed up engine running: about 0 V or duty controlled


Fig 1: Identifying ECM/PCM Inputs And Outputs At ECM/PCM Connector C (◦) (49P) Terminals
G08069274Courtesy of AMERICAN HONDA MOTOR CO., INC.
Terminal number Wire color Terminal name Description Signal
7 GRN/RED 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)/vehicle in ON mode: battery voltage
With warmed up engine running: duty controlled
8 GRN/WHT 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)/vehicle in ON mode: battery voltage
With warmed up engine running: about 0 V or duty controlled
9(1) GRN/WHT SHC (SHIFT SOLENOID VALVE C) Drives shift solenoid valve C With engine running in N, 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 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)/vehicle in ON mode: about 5.0 V
12 YEL/BLU VCC2 (SENSOR VOLTAGE) Provides sensor reference voltage With ignition switch ON (II)/vehicle in ON mode: about 5.0 V
14(1) WHT/GRN OP5SW (TRANSMISSION FLUID PRESSURE SWITCH D (5TH CLUTCH)) Detects transmission fluid pressure switch D (5th clutch) With engine running:
  • Without 5th clutch pressure: battery voltage
  • With 5th clutch pressure: about 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 0.2 V at all times
(1) A/T


Fig 1: Identifying ECM/PCM Inputs And Outputs At ECM/PCM Connector C (◦) (49P) Terminals
G08069275Courtesy of AMERICAN HONDA MOTOR CO., INC.
Terminal number Wire color Terminal name Description Signal
17(1) YEL/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(1) BLU/YEL ATPFWD (TRANSMISSION RANGE SWITCH FWD) Detects transmission range switch D, S positions signal In D and S: about 0 V
In any position other than D and S: about 5.0 V
19(1) RED/WHT ATPRVS (TRANSMISSION RANGE SWITCH RVS) Detects transmission range switch R position signal In R: about 0 V
In any position other than R: about 5.0 V
20(1) BLU/YEL SHA (SHIFT SOLENOID VALVE A) Drives shift solenoid valve A With engine running in 1st and 2nd gears: battery voltage
With engine running in any gear other than 1st and 2nd: about 0 V
21(1) RED LSA (A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A) Drives A/T clutch pressure control solenoid valve A With ignition switch ON (II)/vehicle in ON mode: current controlled
23 WHT/RED 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)/vehicle in ON mode: about 1.5 V
24 RED/YEL IAT (INTAKE AIR TEMPERATURE (IAT) SENSOR) Detects IAT sensor signal With ignition switch ON (II)/vehicle in ON mode: about 0.1-4.8 V (depending on intake air temperature)
25(1) 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
(1) A/T


Fig 1: Identifying ECM/PCM Inputs And Outputs At ECM/PCM Connector C (◦) (49P) Terminals
G08069276Courtesy of AMERICAN HONDA MOTOR CO., INC.
Terminal number Wire color Terminal name Description Signal
26(1) RED/BLK 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(1) BLU/BLK OP2SW (TRANSMISSION FLUID PRESSURE SWITCH A (2ND CLUTCH) Detects transmission fluid pressure switch A (2nd clutch) With engine running:
  • Without 2nd clutch pressure: battery voltage
  • With 2nd clutch pressure: about 0 V
28(1) GRN/WHT SHB (SHIFT SOLENOID VALVE B) Drives shift solenoid valve B With engine running in 1st, 2nd, and 3rd gears: battery voltage
With engine running in any gear other than 1st, 2nd, and 3rd: about 0 V
31(1) WHT/BLK OP6SW (TRANSMISSION FLUID PRESSURE SWITCH E (6TH CLUTCH)) Detects transmission fluid pressure switch E (6th clutch) With engine running:
  • Without 6th clutch pressure: battery voltage
  • With 6th clutch pressure: about 0 V
32 RED/WHT ECT1 (ENGINE COOLANT TEMPERATURE SENSOR (ECT) SENSOR 1) Detects ECT sensor 1 signal With ignition switch ON (II)/vehicle in ON mode: about 0.1- 4.8 V (depending on engine coolant temperature)
33(1) BLU/YEL TATF (ATF TEMPERATURE SENSOR) Detects ATF temperature signal With ignition switch ON (II)/vehicle in ON mode: about 0.2- 4.0 V (about 1.8 V at operating temperature, depending on ATF temperature)
(1) A/T


Fig 1: Identifying ECM/PCM Inputs And Outputs At ECM/PCM Connector C (◦) (49P) Terminals
G08069277Courtesy of AMERICAN HONDA MOTOR CO., INC.
Terminal number Wire color Terminal name Description Signal
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(1) WHT/BLU OPPL SW (LINE PRESSURE SWITCH) Detects line pressure switch With engine running:
  • Without line pressure: battery voltage
  • With line pressure: about 0 V
36 BLU 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)/vehicle in ON mode: about 1.5 V
37(1) BLU/YEL OP4SW (CLUTCH TRANSMISSION FLUID PRESSURE SWITCH C (4TH CLUTCH)) Detects clutch transmission fluid pressure switch C (4th clutch) With engine running:
  • Without 4th clutch pressure: battery voltage
  • With 4th clutch pressure: about 0 V
38(1) BLU/WHT OP3SW (TRANSMISSION FLUID PRESSURE SWITCH B (3RD CLUTCH)) Detects transmission fluid pressure switch B (3rd clutch) With engine running:
  • Without 3rd clutch pressure: battery voltage
  • With 3rd clutch pressure: 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 ECM/PCM Less than 0.2 V at all times
(1) ATT


Fig 1: Identifying ECM/PCM Inputs And Outputs At ECM/PCM Connector C (◦) (49P) Terminals
G08069278Courtesy of AMERICAN HONDA MOTOR CO., INC.
Terminal number Wire color Terminal name Description Signal
42 WHT/BLU ALTL (ALTERNATOR L SIGNAL) Detects alternator L signal With ignition switch ON (II)/vehicle in ON mode: about 0 V
With engine running: battery voltage
43 WHT/GRN ALTC (ALTERNATOR CONTROL) Sends alternator control signal With 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)
45 BLU/YEL OPSW (OIL PRESSURE SWITCH) Detects engine oil pressure signal With ignition switch ON (II)/vehicle in ON mode: battery voltage
With engine running: about 0 V
46(1) RED ATPS (TRANSMISSION RANGE SWITCH S) Detects transmission switch S position signal In S: about 0 V
In any position other than S: about 5.0 V
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)/vehicle in ON mode: about 0 V
49 WHT/RED IMT- (INTAKE MANIFOLD TUNING (IMT) ACTUATOR -SIDE) Drives IMT actuator With ignition switch ON (II)/vehicle in ON mode: about 0 V
(1) A/T
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