PCM A/T Control System Inputs and Outputs at PCM connector C ◦ (49P)

Fig 1: Identifying PCM Connector C (49P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

TERMINALS DESCRIPTION CHART

Terminal number

Wire color

Terminal name

Description

Signal

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

C12

GRN

VCC2(SENSOR VOLTAGE)

Provides sensor reference voltage

With ignition switch ON (II): about 5.0 V

C14⁽¹⁾

LT BLU

OP5SW (TRANSMISSION FLUID PRESSURE SWITCH D (5TH CLUTCH))

Detects transmission fluid pressure switch D (5th clutch) signal

With engine running:

Without 5th clutch pressure: about 5.0 V
With 5th clutch pressure: about 0 V

C14⁽²⁾

LT BLU

OP5SW (TRANSMISSION FLUID PRESSURE SWITCH D (5TH CLUTCH))

Detects transmission fluid pressure switch D (5th clutch) signal

With engine running:

Without 5th clutch pressure: battery voltage
With 5th clutch pressure: about 0 V

C15

GRN

SG6 (SENSOR GROUND)

Sensor ground

Less than 0.2 V at all times

C16

GRY

SG2 (SENSOR GROUND)

Sensor ground

Less than 0.2 V at all times

C17⁽¹⁾

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

C17*2

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

C18⁽¹⁾

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

C18⁽²⁾

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

C19⁽¹⁾

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

C19⁽²⁾

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: about 5.0 V

C20

BLU

SHA (SHIFT SOLENOID VALVE A)

Drives shift solenoid valve A

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

C21

RED

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

Drives AT clutch pressure control solenoid valve A

With ignition switch ON (II): current controlled

C25⁽¹⁾

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

C25⁽²⁾

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

C26

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

C27⁽¹⁾

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

C27⁽²⁾

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

C28

TAN

SHB (SHIFT SOLENOID VALVE B)

Drives shift solenoid valve B

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

C31⁽¹⁾

GRN

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

Detects transmission fluid pressure switch E (6th clutch) signal

With engine running:

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

C31⁽²⁾

GRN

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

Detects transmission fluid pressure switch E (6th clutch) signal

With engine running:

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

C33

GRN

TATF (ATF TEMPERATURE SENSOR)

Detects ATF temperature sensor signal

With ignition switch ON (II): about 0.2-4.0 V (about 1.8 V at operating temperature, depending on ATF temperature)

C35⁽¹⁾

BRN

OPPLSW (LINE PRESSURE SWITCH)

Detects line pressure switch signal

With engine running:

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

C35⁽²⁾

BRN

OPPLSW (LINE PRESSURE SWITCH)

Detects line pressure switch signal

With engine running:

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

C37⁽¹⁾

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

C37⁽²⁾

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

C38⁽¹⁾

LT BLU

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

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

With engine running:

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

C38⁽²⁾

LT BLU

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

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

With engine running:

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

C41

BRN

LG1 (LOGIC GROUND)

Ground circuit for PCM

Less than 0.2 V at all times

C46⁽¹⁾

RED

ATPL (TRANSMISSION RANGE SWITCH L POSITION)

Detects transmission switch L position signal input

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

C46⁽²⁾

RED

ATPL (TRANSMISSION RANGE SWITCH L POSITION)

Detects transmission switch L position signal input

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

⁽¹⁾	Keihin PCM

⁽²⁾	Continental PCM