ECM/PCM Inputs and Outputs at Connector E (31P)

Fig 1: Identifying ECM/PCM Connector E (31P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

NOTE: Standard battery voltage is about 12 V.

ECM/PCM CONNECTOR E REFERENCE TABLE

Terminal number

Wire color

Terminal name

Description

Signal

GRN

ECT2 (ENGINE COOLANT TEMPERATURE SENSOR 2)

Detects ECT sensor 2 signal

With ignition switch ON (II): about 0.1- 4.9 V (depending on engine coolant temperature)

2⁽¹⁾

WHT/BLU

SLS (SHIFT LOCK SOLENOID)

Drives shift lock solenoid

With ignition switch ON (II), in P position, brake pedal pressed, and accelerator released: about 0 V

BRN/YEL

LG3 (LOGIC GROUND)

Ground for ECM/PCM control circuit

Less than 1.0 V at all times

WHT/GRN

SG3 (SENSOR GROUND)

Sensor ground

Less than 1.0 V at all times

YEL/BLU

VCC3 (SENSOR VOLTAGE)

Provides sensor voltage

With ignition switch ON (II): about 5.0 V
With ignition switch OFF: about 0 V

RED/YEL

MRLY (PGM-FI MAIN RELAY)

Drives PGM-FI main relay 1 (Fl MAIN) Power source for DTC memory

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

ORN

AFSHTCR (AIR FUEL RATIO (A/F) SENSOR HEATER CONTROL RELAY)

Drives A/F sensor heater relay

With ignition switch ON (II): about 0 V

BLK/YEL

IG1 (IGNITION SIGNAL)

Detects ignition signal

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

WHT

CANH (CAN COMMUNICATION SIGNAL HIGH)

Sends communication signal

With ignition switch ON (II): pulses

GRN/WHT

FANC (RADIATOR FAN CONTROL)

Drives radiator fan relay

With radiator fan running: about 0 V
With radiator fan stopped: battery voltage

LT GRN

FTP (FUEL TANK PRESSURE (FTP) SENSOR)

Detects FTP sensor signal

With ignition switch ON (II) and fuel fill cap removed: about 2.5 V

GRN/BLK

ELD (ELECTRICAL LOAD DETECTOR)

Detects ELD signal

With ignition switch ON (II): about 0.1-4.8 V (depending on electrical load)

LT GRN/BLK

PSPSW (POWER STEERING PRESSURE SWITCH SIGNAL)

Detects PSP switch signal

At idle with steering wheel straight ahead: about 0 V
At idle with steering wheel at full lock: battery voltage

GRN/YEL

IMOFPR (IMMOBILIZER FUEL PUMP RELAY)

Drives PGM-FI main relay 2 (FUEL PUMP)

0 V for 2 seconds after turning ignition switch ON (II), then battery voltage

RED

ACC (A/C CLUTCH RELAY)

Drives A/C clutch relay

With compressor ON: about 0 V
With compressor OFF: battery voltage

LT GRN/RED

VSV (EVAPORATIVE EMISSION (EVAP) CANISTER VENT SHUT VALVE)

Drives EVAP canister vent shut valve

With ignition switch ON (II): battery voltage

⁽¹⁾

A/T

Fig 2: Identifying ECM/PCM Connector E (31P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

NOTE: Standard battery voltage is about 12 V.

ECM/PCM CONNECTOR E REFERENCE TABLE

Terminal number

Wire color

Terminal name

Description

Signal

WHT/RED

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

Detects secondary HO2S (sensor 2) signal

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

GRN/RED

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

Drives secondary HO2S heater

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

WHT/BLK

BKSW (BRAKE PEDAL POSITION SWITCH)

Detects brake pedal position switch signal

With brake pedal released: about 0 V With brake pedal pressed: battery voltage

RED

CANL (CAN COMMUNICATION SIGNAL LOW)

Sends communication signal

With ignition switch ON (II): pulses

26⁽¹⁾, ⁽²⁾

BLU

VSSOUT (VEHICLE SPEED SIGNAL OUTPUT)

Sends vehicle spped signal

Depending on vehicle speed: pulses

WHT

IMOCD (IMMOBILIZER CODE)

Detects immobilizer signal

BRN

SCS (SERVICE CHECK SIGNAL)

Detects service check signal

With service check signal shorted using HDS: about 0 V With service check signal open: about 5.0 V

RED/WHT

WEN (WRITE ENABLE SIGNAL)

Detects write enable signal

With ignition switch ON (II): about 0 V

⁽¹⁾

⁽²⁾	With navigation system