ECM/PCM Inputs and Outputs at Connector C (◦) (49P): Notes

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

Courtesy of AMERICAN HONDA MOTOR CO., INC.

CONNECTOR TERMINAL REFERENCE TABLE

Terminal number

Wire color

Terminal name

Description

Signal

WHT ⁽²⁾
PNK⁽⁴⁾

IG1ETCS (IGNITION SIGNAL ETCS)

Detects ignition signal

With ignition switch ON (II): battery voltage

BRN⁽²⁾
BLK⁽⁴⁾

PGM ETCS (POWER GROUND ETCS)

Ground circuit for ECM/PCM circuit

Less than 0.2 V at all times

YEL

ETCSM- (THROTTLE ACTUATOR-SIDE)

Ground for throttle actuator

With ignition switch ON (II) and accelerator pedal released: about 0 V
With ignition switch ON (II) and accelerator pedal pressed: about 1.8 V

YEL/RED ⁽²⁾
TAN ⁽⁴⁾

ETCSM+ (THROTTLE ACTUATOR +SIDE)

Drives throttle actuator

About 1.5 V immediately after turning ignition switch ON (II), then about 0 V

BRN ⁽²⁾
LT GRN ⁽⁴⁾

INJ1 (No. 1 INJECTOR)

Drives No. 1 injector

At idle: duty controlled
With ignition switch ON (II): battery voltage

RED ⁽²⁾
TAN ⁽⁴⁾

INJ2 (No. 2 INJECTOR)

Drives No. 2 injector

BLU

INJ3 (No. 3 INJECTOR)

Drives No. 3 injector

YEL ⁽²⁾
RED ⁽⁴⁾

INJ4 (No. 4 INJECTOR)

Drives No. 4 injector

GRN

AFSHTC (AIR FUEL RATIO (A/F) SENSOR HEATER CONTROL (SENSOR 1))

Drives A/F sensor heater (sensor 1)

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

BLK/RED ⁽²⁾
TAN ⁽⁴⁾

IG1 (IGNITION SIGNAL)

Detects ignition signal

With ignition switch ON (II): battery voltage

GRN/RED ⁽²⁾
PUR ⁽⁴⁾

MAP (MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR)

Detects MAP sensor signal

With ignition switch ON (II): about 3.0 V
At idle: about 1.0 V (depending on engine speed)

BLU ⁽²⁾
WHT ⁽⁴⁾

VCC3 (SENSOR VOLTAGE)

Provides sensor reference voltage

With ignition switch ON (II): about 5.0 V

YEL/RED ⁽²⁾
PNK ⁽⁴⁾

VCC1 (SENSOR VOLTAGE)

Provides sensor reference voltage

With ignition switch ON (II): about 5.0 V

GRN/WHT ⁽²⁾
BLU ⁽⁴⁾

SG1 (SENSOR GROUND)

Sensor ground

Less than 0.2 V at all times

WHT

IGPLS1 (No. 1 IGNITION COIL PULSE)

Drives No. 1 ignition coil

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

WHT/GRN ⁽²⁾
GRN ⁽⁴⁾

IGPLS2 (No. 2 IGNITION COIL PULSE)

Drives No. 2 ignition coil

WHT/BLK ⁽²⁾
TAN ⁽⁴⁾

IGPLS3 (No. 3 IGNITION COIL PULSE)

Drives No. 3 ignition coil

WHT/BLU ⁽²⁾
LT BLU ⁽⁴⁾

IGPLS4 (No. 4 IGNITION COIL PULSE)

Drives No. 4 ignition coil

RED/BLK ⁽²⁾
PUR ⁽⁴⁾

TPSA (THROTTLE POSITION (TP) SENSOR A)

Detects TP sensor A signal

With ignition switch ON (II) and accelerator pedal released: about 0.8 V
With ignition switch ON (II) and accelerator pedal pressed: about 3.9 V

RED

TPSB (THROTTLE POSITION (TP) SENSOR B)

Detects TP sensor B signal

With ignition switch ON (II) and accelerator pedal released: about 1.7 V
With ignition switch ON (II) and accelerator pedal pressed: about 4.1 V

BLU/BLK ⁽²⁾
BLU ⁽⁴⁾

VTPSW (ROCKER ARM OIL PRESSURE SWITCH)

Detects rocker arm oil pressure switch signal

At idle: about 0 V

RED ⁽²⁾
PNK ⁽⁴⁾

AFS+ (AIR FUEL RATIO (A/F) SENSOR (SENSOR 1) +SIDE)

Detects A/F sensor (sensor 1) signal

At idle: about 2.2 V

RED/YEL ⁽²⁾
TAN ⁽⁴⁾

AFS- (AIR FUEL RATIO (A/F) SENSOR (SENSOR 1) -SIDE)

Detects A/F sensor (sensor 1) signal

At idle: about 1.8 V

GRN

CMP (CAMSHAFT POSITION (CMP) SENSOR)

Detects CMP sensor signal

With engine, running: pulses

BLU

CKP (CRANKSHAFT POSITION (CKP) SENSOR)

Detects CKP sensor signal

With engine running: pulses

GRN ⁽²⁾
BLU ⁽⁴⁾

SG3 (SENSOR GROUND)

Sensor ground

Less than 0.2 V at all times

BRN/YEL ⁽²⁾
BRN ⁽⁴⁾

LG1 (LOGIC GROUND)

Ground circuit for ECM/PCM circuit

Less than 0.2 V at all times

RED/BLU ⁽¹⁾
WHT ⁽³⁾

KS (KNOCK SENSOR)

Detects knock sensor signal

With engine knocking: pulses

BRN/YEL ⁽²⁾
BRN ⁽⁴⁾

LG2 (LOGIC GROUND)

Ground circuit for ECM/PCM circuit

Less than 0.2 V at all times

⁽¹⁾	2009-10 models

⁽²⁾	2009-10 models and 2011-12 models (M/T)

⁽³⁾	2011-12 models

⁽⁴⁾	2011-12 models (A/T)