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

Fig 1: Identifying PCM Inputs And Outputs At PCM Connector C (49P)

Courtesy 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	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	IG1ETCS (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 (Bank 1, sensor 2) heater	With ignition switch ON (II): 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): battery voltage With warmed up engine running: about 0 V or pulses
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): 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): battery voltage With warmed up engine running: about 0 V or pulses
9	GRN/WHT	SHC (SHIFT SOLENOID VALVE C)	Drives shift solenoid valve C	With engine running in N and D during no lock-up condition: about 0 V With engine running in P, R, and D during lock-up condition: battery voltage
10	BLU/RED	EGR (EXHAUST GAS RECIRCULATION (EGR) VALVE)	Drives EGR valve	With EGR operating: duty controlled Without EGR operating: about 0 V

Fig 1: Identifying PCM Inputs And Outputs At PCM Connector C (49P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Terminal number

Wire color

Terminal name

Description

Signal

YEL/BLU

VCC6 (SENSOR VOLTAGE)

Provides sensor reference voltage

With ignition switch ON (II): about 5.0 V

YEL/BLU

VCC2 (SENSOR VOLTAGE)

Provides sensor reference voltage

With ignition switch ON (II): about 5.0 V

14⁽¹⁾

WHT/GRN

OP5SW (TRANSMISSION FLUID PRESSURE SWITCH D (5TH CLUTCH))

Detects transmission fluid pressure switch D (5th clutch) signal

With ignition switch ON (II):

Without 5th clutch pressure: battery voltage
With 5th clutch pressure: about 0 V

14⁽²⁾

WHT/GRN

OP5SW (TRANSMISSION FLUID PRESSURE SWITCH D (5TH CLUTCH))

Detects transmission fluid pressure switch D (5th clutch) signal

With ignition switch ON (II):

Without 5th clutch pressure: about 5.0 V
With 5th clutch pressure: about 0 V

GRN/RED

SG6 (SENSOR GROUND)

Sensor ground

Less than 0.2 V at all times

GRN/YEL

SG2 (SENSOR GROUND)

Sensor ground

Less than 0.2 V at all times

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

17⁽²⁾

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: battery voltage

18⁽¹⁾

BLU/YEL

ATPFWD (TRANSMISSION RANGE SWITCH FWD)

Detects transmission range switch FWD position signal

In D and S: about 0 V
In any position other than D and S: about 5.0 V

18⁽²⁾

BLU/YEL

ATPFWD (TRANSMISSION RANGE SWITCH FWD)

Detects transmission range switch FWD position signal

In D and S: about 0 V
In any position other than D and S: battery voltage

19⁽¹⁾

RED/WHT

ATPRVS (TRANSMISSION RANGE SWITCH RVS)

Detects transmission range switch RVS position signal

In R: about 0 V
In any position other than R: about 5.0 V

19⁽²⁾

RED/WHT

ATPRVS (TRANSMISSION RANGE SWITCH RVS)

Detects transmission range switch RVS position signal

In R: about 0 V
In any position other than R: battery voltage

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

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

NOTE: Check the label on the PCM to see if it was made by Keihin or Continental. Refer to the GENERAL TROUBLESHOOTING INFORMATION for more details.

⁽¹⁾	Continental PCM

⁽²⁾	Keihin PCM

Fig 1: Identifying PCM Inputs And Outputs At PCM Connector C (49P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Terminal number

Wire color

Terminal name

Description

Signal

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): about 1.5 V

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⁽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

25⁽²⁾

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

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) signal

With ignition switch ON (II):

Without 2nd clutch pressure: battery voltage
With 2nd clutch pressure: about 0 V

27⁽²⁾

BLU/BLK

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: about 5.0 V
With 2nd clutch pressure: about 0 V

BLU/RED

SHB (SHIFT SOLENOID VALVE B)

Drives shift solenoid valve B

With engine running in 1st, 2nd, and 3rd gears (upshift condition): battery voltage
With engine running in any gear other than 1st, 2nd, 3rd (upshift condition): about 0 V

31⁽¹⁾

WHT/BLK

OP6SW (TRANSMISSION FLUID PRESSURE SWITCH E (6TH CLUTCH))

Detects transmission fluid pressure switch E (6th clutch) signal

With ignition switch ON (II):

Without 6th clutch pressure: battery vltage
With 6th clutch pressure: about 0 V

31⁽²⁾

WHT/BLK

OP6SW (TRANSMISSION FLUID PRESSURE SWITCH E (6TH CLUTCH))

Detects transmission fluid pressure switch E (6th clutch) signal

With ignition switch ON (II):

Without 6th clutch pressure: about 5.0 V
With 6th clutch pressure: about 0 V

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)

BLU/YEL

TATF (ATF TEMPERATURE SENSOR)

Detects AFT temperature signal

With ignition switch ON (II): about 0.2-4.0 V (about 1.8 V at operating temperature, depending on ATF temperature)

NOTE: Check the label on the PCM to see if it was made by Keihin or Continental. Refer to the GENERAL TROUBLESHOOTING INFORMATION for more details.

⁽¹⁾	Continental PCM

⁽²⁾	Keihin PCM

Fig 1: Identifying PCM Inputs And Outputs At PCM Connector C (49P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Terminal number

Wire color

Terminal name

Description

Signal

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)

WHT/BLU

OPPLSW (LINE PRESSURE SWITCH)

Detects line pressure switch signal

With ignition switch ON (II):

Without line pressure: battery voltage
With line pressure: about 0 V

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): about 1.5 V

37⁽¹⁾

BLU/YEL

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

37⁽²⁾

BLU/YEL

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: about 5.0 V
With 4th clutch pressure: about 0 V

38⁽²⁾

BLU/WHT

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

38⁽²⁾

BLU/WHT

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: about 5.0 V
With 3rd clutch pressure: about 0 V

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

BRN/YEL

LG1 (LOGIC GROUND)

Ground circuit for PCM

Less than 0.2 V at all times

WHT/BLU

ALTL (ALTERNATOR L SIGNAL)

Detects alternator L signal

With ignition switch ON (II): about 0 V
With engine running: battery voltage

WHT/GRN

ALTC (ALTERNATOR CONTROL)

Sends alternator control signal

With warmed up engine running: about 7.5 V (depending on electrical load)

WHT/RED

ALTF (ALTERNATOR FR SIGNAL)

Detects alternator FR signal

With engine running: about 0-5.0 V (depending on electrical load)

BLU/YEL

OPSW (OIL PRESSURE SWITCH)

Detects engine oil pressure signal

With ignition switch ON (II): battery voltage
With engine running: about 0 V

NOTE: Check the label on the PCM to see if it was made by Keihin or Continental. Refer to the GENERAL TROUBLESHOOTING INFORMATION for more details.

⁽¹⁾	Continental PCM

⁽²⁾	Keihin PCM