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

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

Courtesy of AMERICAN HONDA MOTOR CO., INC.

NOTE: Standard battery voltage is about 12 V.

BATTERY VOLTAGE SPECIFICATION

Terminal number

Wire color

Terminal name

Description

Signal

BLK

PGMETCS (POWER GROUND ETCS)

Ground circuit for PCM

Less than 1.0 Vat all times

BLU⁽¹⁾
LT BLU⁽²⁾

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

YEL/GRN⁽¹⁾
BRN⁽²⁾

IG1ETCS (IGNITION SIGNAL ETCS)

Detects ignition signal

With ignition switch ON (II): battery voltage

BLK/WHT⁽¹⁾
PUR⁽²⁾

SO2SHTCB1 (REAR SECONDARY HEATED OXYGEN SENSOR (REAR SECOND ARY HO2S) HEATER)

Drives rear secondary HO2S heater (Bank 1, sensor 2)

With ignition switch ON (II): battery voltage
With warmed up engine running: duty controlled

BLK/WHT⁽¹⁾
TAN⁽²⁾

AFS HTCB1 (REAR AIR FUEL RATIO (REAR A/F) SENSOR HEATER CONTROL BANK 1, SENSOR 1)

Drives rear A/F sensor heater (Bank 1, sensor 1)

With ignition switch ON (II): battery voltage
With warmed up engine running: about 0 V or duty controlled

GRN/RED⁽¹⁾
YEL⁽²⁾

SO2SHTCB2 (FRONT SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S) HEATER)

Drives front secondary HO2S heater (Bank 2, sensor 2)

With ignition switch ON (II): battery voltage
With warmed up engine running: duty controlled

GRN/WHT⁽¹⁾
GRY⁽²⁾

AFSHTCB2 (FRONT AIR FUEL RATIO (FRONT A/F) SENSOR HEATER CONTROL BANK 2, SENSOR 1)

Drives front A/F sensor heater (Bank 2, sensor 1)

With ignition switch ON (II): battery voltage
With warmed up engine running: about 0 V or duty controlled

9⁽¹⁾

GRN/RED

SHD (SHIFT SOLENOID VALVE D)

Drives shift solenoid valve D

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

9⁽²⁾

GRN

SHD (SHIFT SOLENOID VALVE C)

Drive shift solenoid valve C

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

BLU/RED⁽¹⁾
LT BLU⁽²⁾

EGR (EXHAUST GAS RECIRCULATION (EGR) VALVE)

Drives EGR valve

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

YEL/BLU⁽¹⁾
RED⁽²⁾

VCC6 (SENSOR VOLTAGE)

Provides sensor reference voltage

With ignition switch ON (II): about 5.0 V

YEL/BLU⁽¹⁾
TAN⁽²⁾

VCC2 (SENSOR VOLTAGE)

Provides sensor reference voltage

With ignition switch ON (II): about 5.0 V

RED/GRN⁽¹⁾
RED⁽²⁾

PDSW (A/C PRESSURE SWITCH)

Detects A/C pressure switch signal

With A/C pressure switch ON: about 0 V
With A/C pressure switch OFF: battery voltage

GRN/RED⁽¹⁾
GRN⁽²⁾

SG6 (SENSOR GROUND)

Sensor ground

Less than 1.0 Vat all times

GRN/YEL⁽¹⁾
GRY⁽²⁾

SG2 (SENSOR GROUND)

Sensor ground

Less than 1.0 V at all times

YEL/GRN⁽¹⁾
BLK⁽²⁾

ATPD (TRANSMISSION RANGE SWITCH D)

Detects transmission range switch D position signal input

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

BLU/YEL⁽¹⁾
YEL⁽²⁾

ATP FWD (TRANSMISSION RANGE SWITCH FWD POSITION)

Detects transmission range switch FWD position signal

In D, D3, and 2: about 0 V
In any position other than D, D3, and 2: about 5.0 V

RED/WHT⁽¹⁾
PNK⁽²⁾

ATP RVS (TRANSMISSION RANGE SWITCH RVS POSITION)

Detects transmission range switch RVS position signal input

In P, R, and N: about 0 V
In any position other than P, R, and N: about 5.0 V

20⁽¹⁾

BLU/YEL

SHA (SHIFT SOLENOID VALVE A)

Drives shift solenoid valve A

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

20⁽²⁾

TAN

SHB (SHIFT SOLENOID VALVE B)

Drive shift solenoid valve B)

With engine running in P, R, N, 2, 1, and D (in 1st, 2nd, and 5th gears): about 0V

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

RED/YEL⁽¹⁾
LT GRN⁽²⁾

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)

WHT

ATPR (TRANSMISSION RANGE SWITCH R)

Detects transmission range switch R position signal input

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

RED/BLK⁽¹⁾
PUR⁽²⁾

ATPN (TRANSMISSION RANGE SWITCH N)

Detects transmission range switch N position signal input

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

BLU/BLK⁽¹⁾
LT GRN⁽²⁾

OP2SW (2ND CLUTCH TRANSMISSION FLUID PRESSURE SWITCH)

Detects 2nd clutch transmission fluid pressure switch input

With ignition switch ON (II):

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 P, R, N, 2, and 1, D (in 1st, 2nd, and 5th gears), and D3 (in 1st and 2nd gears): battery voltage
With engine running in D (in 3rd and 4th gears): about 0 V

28⁽²⁾

BLU

SHA (SHIFT SOLENOID VALVE A)

Drive shift solenoid valve A

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

RED/WHT⁽¹⁾
PNK⁽²⁾

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⁽¹⁾
GRN⁽²⁾

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)

WHT/BLK⁽¹⁾
PUR⁽²⁾

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)

BRN

ATP1 (TRANSMISSION RANGE SWITCH 2-1)

Detects transmission switch 1 signal input

In 1: about 0 V
In any position other than 1: about 5.0 V

36⁽²⁾

WHT

SO2SGB2 (FRONT SECONDARY HEATED OXYGEN SENSOR (FRONT SECONDARY HO2S (BANK 2, SENSOR2)) SENSOR GROUND

Sensor ground for front secondary HO2S (Bank 2, sensor 2)

With ignition switch ON (II): about 1.5 V

BLU/YEL⁽¹⁾
BLU⁽²⁾

OP4SW (4TH CLUTCH TRANSMISSION FLUID PRESSURE SWITCH)

Detects 4th clutch transmission fluid pressure switch input

With ignition switch ON (II):

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

BLU/WHT⁽¹⁾
LT BLU⁽²⁾

OP3SW (3RD CLUTCH TRANSMISSION FLUID PRESSURE SWITCH)

Detects 3rd clutch transmission fluid pressure switch input

With ignition switch ON (II):

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

39⁽¹⁾

GRN

SHC (SHIFT SOLENOID VALVE C)

Drives shift solenoid valve C

With engine running in 1, D (in 1st, 3rd, and 5th gears), and D3 (in 1st and 3rd gears): battery voltage
With engine running in P, R, N, 2, D (in 2nd and 4th gears), and D3 (in 2nd gear): about 0 V

RED/YEL⁽¹⁾
RED⁽²⁾

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⁽¹⁾
BRN⁽²⁾

LG1 (LOGIC GROUND)

Ground circuit for PCM

Less than 1.0 Vat all times

WHT/BLU⁽¹⁾
BLU⁽²⁾

ALTL (ALTERNATOR L SIGNAL)

Detects alternator L signal

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

WHT/GRN⁽¹⁾
GRN⁽²⁾

ALTC (ALTERNATOR CONTROL)

Sends alternator control signal

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

WHT/RED⁽¹⁾
RED⁽²⁾

ALTF (ALTERNATOR FR SIGNAL)

Detects alternator FR signal

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

BLU/YEL⁽¹⁾
PUR⁽²⁾

OPSW (OIL PRESSURE SWITCH)

Detects engine oil pressure signal

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

RED

ATP2 (TRANSMISSION RANGE SWITCH 2)

Detects transmission range switch 2 position signal input

In 2: about 0 V
In any position other than 2: battery voltage

RED/BLU⁽¹⁾
BLU⁽²⁾

KS (KNOCK SENSOR)

Detects knock sensor signal

With engine knocking: pulses

WHT/BLU⁽¹⁾
WHT⁽²⁾

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

Drives IMT actuator

With ignition switch ON (II): about 0 V

WHT/RED⁽¹⁾
BLU⁽²⁾

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

Drives IMT actuator

With ignition switch ON (II): about 0 V

⁽¹⁾	'09-11 models

⁽²⁾

'12 model