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

Fig 1: Identifying PCM Connector Terminals C (49P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

NOTE: Check the label on the PCM to see if it was made by Keihin or Continental. Refer to the General Troubleshooting Information .

PCM CONNECTOR TERMINALS REFERENCE CHART C (49P)

Terminal number

Wire color

Terminal name

Description

Signal

BLK

PGMETCS (POWER GROUND ETCS)

Ground circuit for PCM

Less than 0.2 V at all times

LT BLU

ETCSM+ (THROTTLE ACTUATOR +SIDE)

Drives throttle actuator

With ignition switch ON (II): about 0 V

GRN

ETCSM- (THROTTLE ACTUATOR-SIDE)

Ground for throttle actuator

With ignition switch ON (II): about 0 V

BRN

IG1 ETCS (IGNITION SIGNAL ETCS)

Detects ignition signal

With ignition switch ON (II): battery voltage

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

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

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

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⁽¹⁾

GRN

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 and R, and in D and L during lock-up condition: battery voltage

9⁽²⁾⁽³⁾

GRN

SHC (SHIFT SOLENOID VALVE C)

Drives shift solenoid valve C

With engine running in D (in 1st, 3rd, and 5th), and L (in 1st): battery voltage
With engine running in P, R, N, and D (in 2nd and 4th): about 0 V

9⁽²⁾⁽⁴⁾

PUR

SHD (SHIFT SOLENOID VALVE D)

Drives shift solenoid valve D

With engine running in N, D, and L during lock-up condition: battery voltage
With engine running in P, R, N, and D during no lock-up condition: about 0 V

LT BLU

EGR (EXHAUST GAS RECIRCULATION (EGR) VALVE)

Drives EGR valve

With EGR operating: duty controlled With EGR not operating: about 0 V

RED

VCC6 (SENSOR VOLTAGE)

Provides sensor reference voltage

With ignition switch ON (II): about 5.0 V

GRN

VCC2 (SENSOR VOLTAGE)

Provides sensor reference voltage

With ignition switch ON (II): about 5.0 V

Not used

14⁽¹⁾⁽³⁾

LT BLU

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

14⁽¹⁾⁽⁴⁾

LT BLU

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

15⁽¹⁾

GRN

SG6 (SENSOR GROUND)

Sensor ground

Less than 0.2 V at all times

GRY

SG2 (SENSOR GROUND)

Sensor ground

Less than 0.2 V at all times

17⁽³⁾

LT GRN

ATPD (TRANSMISSION RANGE SWITCH D POSITION)

Detects transmission range switch D position signal

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

17⁽⁴⁾

LT GRN

ATPD (TRANSMISSION RANGE SWITCH D POSITION)

Detects transmission range switch D position signal

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

18⁽³⁾

YEL

ATPFWD (TRANSMISSION RANGE SWITCH FWD POSITION)

Detects transmission range switch FWD position signal

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

18⁽⁴⁾

YEL

ATPFWD (TRANSMISSION RANGE SWITCH FWD POSITION)

Detects transmission range switch FWD position signal

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

19⁽¹⁾⁽³⁾

PNK

ATPRVS (TRANSMISSION RANGE SWITCH RVS POSITION)

Detects transmission range switch RVS position signal

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

19⁽¹⁾⁽⁴⁾

PNK

ATPRVS (TRANSMISSION RANGE SWITCH RVS POSITION)

Detects transmission range switch P, R, and N positions signal

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

19⁽²⁾⁽³⁾

PNK

ATPRVS (TRANSMISSION RANGE SWITCH RVS POSITION)

Detects transmission range switch RVS position signal

In P, R, and N: about 0 V
In any position other than P, R, and N: battery voltage

19⁽²⁾⁽⁴⁾

PNK

ATPRVS (TRANSMISSION RANGE SWITCH RVS POSITION)

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⁽¹⁾

BLU

SHA (SHIFT SOLENOID VALVE A)

Drives shift solenoid valve A

With engine running in 1st and 2nd: battery voltage
With engine running in any gear other than 1st and 2nd: about 0 V

20⁽²⁾⁽³⁾

TAN

SHB (SHIFT SOLENOID VALVE B)

Drives shift solenoid valve B

With engine running in P, R, N, D (in 1st, 2nd, and 5th), and L (in 1st): battery voltage
With engine running in D (in 3rd and 4th): about 0 V

20⁽²⁾⁽⁴⁾

BLU

SHA (SHIFT SOLENOID VALVE A)

Drives shift solenoid valve A

With engine running in D (in 2nd and 3rd), L (in 2nd), and R: battery voltage
With engine running in P, N, D (in 1st, 4th, and 5th), and L (in 1st): 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

PUR

POIL (ENGINE OIL PRESSURE)

Detects rocker arm oil pressure sensor signal

With ignition switch ON (II): about 0.8 V (depending on engine oil pressure)

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

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⁽³⁾

WHT

ATPR (TRANSMISSION RANGE SWITCH R POSITION)

Detects transmission range switch R position signal

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

25⁽⁴⁾

WHT

ATPR (TRANSMISSION RANGE SWITCH R POSITION)

Detects transmission range switch R position signal

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

PUR

ATPN (TRANSMISSION RANGE SWITCH N POSITION)

Detects transmission range switch N position signal

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

27⁽³⁾

LT GRN

OP2SW (TRANSMISSION FLUID PRESSURE SWITCH A (2ND CLUTCH))

Detects transmission fluid pressure switch A (2nd clutch) signal

With engine running:

Without 2nd clutch pressure: about 5.0 V
With 2nd clutch pressure: about 0 V

27⁽⁴⁾

LT GRN

OP2SW (TRANSMISSION FLUID PRESSURE SWITCH A (2ND CLUTCH))

Detects transmission fluid pressure switch A (2nd clutch) signal

With engine running:

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

28⁽¹⁾

TAN

SHB (SHIFT SOLENOID VALVE B)

Drives shift solenoid valve B

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

28⁽²⁾⁽³⁾

BLU

SHA (SHIFT SOLENOID VALVE A)

Drives shift solenoid valve A

With engine running in D (in 2nd and 3rd), L (in 2nd), and R: battery voltage
With engine running in P, N, D (in 1st, 4th, and 5th), and L (in 1st): about 0 V

28⁽²⁾⁽⁴⁾

TAN

SHB (SHIFT SOLENOID VALVE B)

Drives shift solenoid valve B

With engine running in P, R, N, D (in 1st, 2nd, and 5th), and L (in 1st and 2nd): battery voltage
With engine running in D (in 3rd and 4th): about 0 V

Not used

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

31⁽¹⁾⁽³⁾

GRN

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

Detects transmission fluid pressure switch E (6th clutch)

With ignition switch ON (II)

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

31⁽¹⁾⁽⁴⁾

GRN

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

Detects transmission fluid pressure switch E (6th clutch)

With ignition switch ON (II)

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

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)

GRN

TATF (ATF TEMPERATURE SENSOR)

Detects ATF temperature signal

With ignition switch ON (II): about 0.2-4.0 V (about 1.8 V with warmed up engine, depending on ATF temperature)

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⁽¹⁾⁽³⁾

BRN

OPPLSW (LINE PRESSURE SWITCH)

Detects line pressure switch

With engine running

Without line pressure: about 5.0 V
With line pressure: about 0 V

35⁽¹⁾⁽⁴⁾

BRN

OPPLSW (LINE PRESSURE SWITCH)

Detects line pressure switch

With engine running

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

GRN

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⁽³⁾

BLU

OP4SW (TRANSMISSION FLUID PRESSURE SWITCH C (4TH CLUTCH))

Detects transmission fluid pressure switch C (4th clutch) signal

With engine running:

Without 4th clutch pressure: about 5.0 V
With 4th clutch pressure: about 0 V

37⁽⁴⁾

BLU

OP4SW (TRANSMISSION FLUID PRESSURE SWITCH C (4TH CLUTCH))

Detects transmission fluid pressure switch C (4th clutch) signal

With engine running:

Without 4th clutch pressure: battery voltage
With 4th clutch pressure: about 0 V

38⁽³⁾

LT BLU

OP3SW (TRANSMISSION FLUID PRESSURE SWITCH B (3RD CLUTCH))

Detects transmission fluid pressure switch B (3rd clutch) signal

With the engine running:

Without 3rd clutch pressure: about 5.0 V
With 3rd clutch pressure: about 0 V

38⁽⁴⁾

LT BLU

OP3SW (TRANSMISSION FLUID PRESSURE SWITCH B (3RD CLUTCH))

Detects transmission fluid pressure switch B (3rd clutch) signal

With the engine running:

Without 3rd clutch pressure: battery voltage
With 3rd clutch pressure: about 0 V

39⁽²⁾⁽⁴⁾

GRN

SHC (SHIFT SOLENOID VALVE C)

Drives shift solenoid valve C

With engine running in D (in 1st, 3rd, and 5th), and L (in 1st): battery voltage
With engine running in P, R, N, D (in 2nd and 4th), and L (in 2nd): about 0 V

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

BRN

LG1 (LOGIC GROUND)

Ground circuit for PCM

Less than 0.2 V at all times

BLU

ALTL (ALTERNATOR L SIGNAL)

Detects alternator L signal

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

GRN

ALTC (ALTERNATOR CONTROL)

Sends alternator control signal

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

RED

ALTF (ALTERNATOR FR SIGNAL)

Detects alternator FR signal

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

Not used

46⁽³⁾

RED

ATPL (TRANSMISSION RANGE SWITCH L POSITION)

Detects transmission range switch L position signal

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

46⁽⁴⁾

RED

ATPL (TRANSMISSION RANGE SWITCH L POSITION)

Detects transmission range switch L position signal

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

BLU

KS (KNOCK SENSOR)

Detects knock sensor signal

With engine knocking: pulses

WHT

IMT+ (INTAKE MANIFOLD TUNING (IMT) ACTUATOR +SIDE)

Drives IMT actuator

With ignition switch ON (II): battery voltage

BLU

IMT- (INTAKE MANIFOLD TUNING (IMT) ACTUATOR-SIDE)

Drives IMT actuator

With ignition switch ON (II): battery voltage

⁽¹⁾	6-speed A/T model

⁽²⁾	5-speed A/T model

⁽³⁾	Keihin PCM

⁽⁴⁾	Continental PCM