ECM/PCM Inputs and Outputs At Connector B (Δ) (49P)

Fig 1: Identifying ECM/PCM Inputs & Outputs Connector B (49P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

CONNECTOR TERMINAL REFERENCE TABLE

Terminal number

Wire color

Terminal name

Description

Signal

BRN ⁽⁵⁾
BLK ⁽⁷⁾

PG2 (POWER GROUND)

Ground circuit for ECM/PCM circuit

Less than 0.2 V at all times

BLU/RED ⁽⁵⁾
LT BLU ⁽⁷⁾

EGR (EXHAUST GAS RECIRCULATION (EGR) VALVE)

Drives EGR valve

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

YEL/BLU ⁽⁵⁾
RED ⁽⁷⁾

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

BLK/WHT ⁽⁵⁾
GRN ⁽⁷⁾

SO2SHTC (SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S) HEATER (SENSOR 2))

Drives secondary HO2S heater (sensor 2)

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

YEL/RED ⁽⁵⁾
TAN ⁽⁷⁾

OPSW (OIL PRESSURE SWITCH)

Detects engine oil pressure signal

With ignition switch OFF: about 0 V
With engine running: battery voltage

8⁽¹⁾

BLU/RED ⁽⁵⁾
BLU ⁽⁷⁾

OP2SW (2ND CLUTCH TRANSMISSION FLUID PRESSURE SWITCH)

Detects 2nd clutch transmission fluid pressure switch input signal

With ignition switch ON (II):
Without 2nd clutch pressure: about 5.0 V
With 2nd clutch pressure: about 0 V

9⁽¹⁾

BLU/WHT ⁽⁵⁾
PNK ⁽⁷⁾

OP3SW (3RD CLUTCH TRANSMISSION FLUID PRESSURE SWITCH)

Detects 3rd clutch transmission fluid pressure switch input signal

With ignition switch ON (II):
Without 3rd clutch pressure: about 5.0 V
With 3rd clutch pressure: about 0 V

BLK

PG1 (POWER GROUND)

Ground circuit for ECM/PCM circuit

Less than 0.2 V at all times

11⁽¹⁾

BLU/BLK ⁽⁵⁾6
LT GRN ⁽⁷⁾7

SHA (SHIFT SOLENOID VALVE A)

Drives shift solenoid valve A

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

12⁽¹⁾

GRN/RED ⁽⁵⁾
RED ⁽⁷⁾

SHD (SHIFT SOLENOID VALVE D)

Drives shift solenoid valve D

With engine running in P, R: battery voltage
With engine running in N: about 0 V

13⁽¹⁾

RED/BLK ⁽⁵⁾
WHT ⁽⁷⁾

ATPN (TRANSMISSION RANGE SWITCH IN N)

Detects transmission range switch N position input signal

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

14⁽¹⁾

BLU/BLK ⁽⁵⁾
GRN ⁽⁷⁾

ATPP (TRANSMISSION RANGE SWITCH IN P)

Detects transmission range switch P position input signal

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

15⁽¹⁾

WHT ⁽⁵⁾
PUR ⁽⁷⁾

ATPR (TRANSMISSION RANGE SWITCH IN R)

Detects transmission range switch R position input signal

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

16⁽³⁾

RED ⁽⁵⁾
LT BLU ⁽⁷⁾

ATPD3 (TRANSMISSION RANGE SWITCH IN D3)

Detects transmission range switch D3 position input signal

In D3: about 0 V
In any position other than D3: battery voltage

16⁽²⁾

RED ⁽⁵⁾
LT BLU ⁽⁷⁾

ATPS (TRANSMISSION RANGE SWITCH IN S)

Detects transmission range switch S position input signal

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

17⁽³⁾

BLU

ATP2-1 (TRANSMISSION RANGE SWITCH 2-1)

Detects transmission range switch 2 and 1 position input signal

In 2 and 1: about 0 V
In any position other than 2 and 1: battery voltage

18⁽¹⁾

WHT/RED ⁽⁵⁾
RED ⁽⁷⁾

NM (INPUT SHAFT (MAINSHAFT) SPEED SENSOR)

Detects input shaft (mainshaft) speed sensor signal

With ignition switch ON (II): about 0 V or about 5.0 V
With engine running in N: pulses

YEL/BLU ⁽⁵⁾
TAN ⁽⁷⁾

VCC2 (SENSOR VOLTAGE)

Provides sensor voltage

With ignition switch ON (II): about 5.0 V

21⁽¹⁾

GRN ⁽⁵⁾
BLU ⁽⁷⁾

SHC (SHIFT SOLENOID VALVE C)

Drives shift solenoid valve C

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

22⁽¹⁾

PNK

ATPD (TRANSMISSION RANGE SWITCH IN D)

Detects transmission range switch D position input signal

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

23⁽¹⁾

YEL

ATPRVS (TRANSMISSION RANGE SWITCH IN RVS)

Detects transmission range switch R position input signal

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

RED/WHT ⁽⁵⁾
PNK ⁽⁷⁾

ECT1 (ENGINE COOLANT TEMPERATURE (ECT) SENSOR 1)

Detects ECT sensor 1 signal

With ignition switch ON (II): about 0.1-4.8 V (depending on engine coolant temperature)

26⁽¹⁾

BLU/YEL ⁽⁵⁾
RED ⁽⁷⁾

LSC (AH" CLUTCH PRESSURE CONTROL SOLENOID VALVE C)

Drives A/T clutch pressure control solenoid valve C

With ignition switch ON (II): duty controlled

27⁽¹⁾

GRN/WHT ⁽⁵⁾
PUR ⁽⁷⁾

SHB (SHIFT SOLENOID VALVE B)

Drives shift solenoid valve B

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

28⁽¹⁾

RED/YEL ⁽⁵⁾
WHT ⁽⁷⁾

TATF (ATF TEMPERATURE SENSOR)

Detects ATF temperature signal

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

29⁽¹⁾

BLU/YEL ⁽⁵⁾
TAN ⁽⁷⁾

ATPFWD (TRANSMISSION RANGE SWITCH IN FWD)

Detects transmission range switch D, D3, 2 and S position input signals

In D, D3, 2, and S: about 0 V
In any position other than D, D3, 2 and S: battery voltage

WHT/BLK ⁽⁵⁾
PUR ⁽⁷⁾

EGRP (EXHAUST GAS RECIRCULATION (EGR) VALVE POSITION SENSOR)

Detects EGR valve position sensor signal

With engine running: about 1.2-3.5 V (depending on EGR valve)

RED/GRN ⁽⁵⁾
GRN ⁽⁷⁾

VG+ (MASS AIR FLOW (MAF) SENSOR+SIDE)

Detects MAF sensor signal

At idle with warmed up engine and no electrical load: about 1.7 V

RED/YEL ⁽⁵⁾
TAN ⁽⁷⁾

IAT (INTAKE AIR TEMPERATURE (IAT) SENSOR)

Detects IAT sensor signal

With ignition switch ON (II): about 0.1-4.0 V

BLK/RED ⁽⁵⁾
PUR

VG-(MASS AIR FLOW (MAF) SENSOR-SIDE)

Ground for MAF sensor signal

Less than 0.2 V at all times

GRN/YEL ⁽⁵⁾
GRY ⁽⁷⁾

SG2 (SENSOR GROUND)

Sensor ground

Less than 0.2 V at all times

GRN/YEL ⁽⁵⁾
LT GRN ⁽⁷⁾

VTS (ROCKER ARM OIL CONTROL SOLENOID)

Drives rocker arm oil control solenoid

At idle: about 0 V

WHT/RED ⁽⁴⁾
PNK ⁽⁶⁾

SHO2S (SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S) SENSOR 2)

Detects secondary HO2S (sensor 2) signal

With throttle fully opened at idle, and warmed up engine: above 0.6 V
With throttle quickly closed: below 0.4 V

37⁽⁶⁾

BLU

SHO2SG (SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S) SENSOR 2 GROUND)

Ground for secondary HO2S (sensor 2)

Less than 0.2 volts at all times

BLK/WHT ⁽⁵⁾
LT BLU ⁽⁷⁾

NC (OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR)

Detects output shaft (countershaft) speed sensor signal

With ignition switch ON (II): about 0 V or about 5.0 V Driving: pulses

40⁽¹⁾

RED/BLK ⁽⁵⁾
LT BLU ⁽⁷⁾

LSA (A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A)

Drives A/T clutch pressure control solenoid valve A

With ignition switch ON (II): duty controlled

WHT/GRN ⁽⁵⁾
GRN ⁽⁷⁾

ALTC (ALTERNATOR CONTROL)

Sends alternator control signal

With warmed up engine running: about 5.0 V (depending on electrical load)

WHT/BLU ⁽⁵⁾
LT BLU ⁽⁷⁾

ALTL (ALTERNATOR L SIGNAL)

Detects alternator L signal

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

WHT/RED ⁽⁵⁾
RED ⁽⁷⁾

ALTF (ALTERNATOR FR SIGNAL)

Detects alternator FR signal

With engine running: about 2.6-3.7 V (depending on electrical load)

48⁽¹⁾

BRN/WHT ⁽⁵⁾
YEL ⁽⁷⁾

LSB (A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE B)

Drives A/T clutch pressure control solenoid valve B

With ignition switch ON (II): duty controlled

⁽¹⁾

A/T

⁽²⁾	A/T (with paddle shifter)

⁽³⁾	A/T (without paddle shifter)

⁽⁴⁾	2009-10 models

⁽⁵⁾	2009-10 models and 2011-12 models (M/T)

⁽⁶⁾	2011-12 models

⁽⁷⁾	2011-12 models (A/T)