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.

Terminal number

Wire color

Terminal name

Description

Signal

GRN/WHT

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

YEL/BLU

VCC2 (SENSOR VOLTAGE)

Provides sensor reference voltage

With ignition switch ON (II): about 5.0 V

C14⁽¹⁾

WHT/GRN

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

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

With ignition switch ON (II):

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

C14⁽²⁾

WHT/GRN

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

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

With ignition switch ON (II):

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

C15

GRN/RED

SG6 (SENSOR GROUND)

Sensor ground

Less than 0.2 V at all times

C16

GRN/YEL

SG2 (SENSOR GROUND)

Sensor ground

Less than 0.2 V at all times

C17⁽¹⁾

YEL/GRN

ATPD (TRANSMISSION RANGE SWITCH D)

Detects transmission range switch D position signal

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

C17⁽²⁾

YEL/GRN

ATPD (TRANSMISSION RANGE SWITCH D)

Detects transmission range switch D position signal

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

C18⁽¹⁾

BLU/YEL

ATPFWD (TRANSMISSION RANGE SWITCH FWD)

Detects transmission range switch FWD position signal

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

C18⁽²⁾

BLU/YEL

ATPFWD (TRANSMISSION RANGE SWITCH FWD)

Detects transmission range switch FWD position signal

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

C19⁽¹⁾

RED/WHT

ATPRVS (TRANSMISSION RANGE SWITCH RVS)

Detects transmission range switch RVS position signal

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

C19⁽²⁾

RED/WHT

ATPRVS (TRANSMISSION RANGE SWITCH RVS)

Detects transmission range switch RVS position signal

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

NOTE: Check the label on the PCM to see if it was made by Keihin or Continental. Refer to the GENERAL TROUBLESHOOTING INFORMATION for more details.

⁽¹⁾	Keihin PCM

⁽²⁾	Continental PCM

Fig 1: Identifying PCM Connector C (◦) (49P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Terminal number

Wire color

Terminal name

Description

Signal

C20

BLU/YEL

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 A/T clutch pressure control solenoid valve A

With ignition switch ON (II): current controlled

C25⁽¹⁾

WHT

ATPR (TRANSMISSION RANGE SWITCH R)

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)

Detects transmission range switch R position signal

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

C26

RED/BLK

ATPN (TRANSMISSION RANGE SWITCH N)

Detects transmission range switch N position signal

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

C27⁽¹⁾

BLU/BLK

OP2SW (TRANSMISSION FLUID PRESSURE SWITCH A (2ND CLUTCH))

Detects transmission fluid pressure switch A (2nd clutch) signal

With ignition switch ON (II):

Without 2nd clutch pressure: about 5.0 V
With 2nd clutch pressure: about 0 V

C27⁽²⁾

BLU/BLK

OP2SW (TRANSMISSION FLUID PRESSURE SWITCH A (2ND CLUTCH))

Detects transmission fluid pressure switch A (2nd clutch) signal

With ignition switch ON (II):

Without 2nd clutch pressure: battery voltage
With 2nd clutch pressure: about 0 V

C28

BLU/RED

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⁾

WHT/BLK

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

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

With ignition switch ON (II):

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

C31⁽²⁾

WHT/BLK

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

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

With ignition switch ON (II):

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

C33

BLU/YEL

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)

NOTE: Check the label on the PCM to see if it was made by Keihin or Continental. Refer to the GENERAL TROUBLESHOOTING INFORMATION for more details.

⁽¹⁾	Keihin PCM

⁽²⁾	Continental PCM

Fig 1: Identifying PCM Connector C (◦) (49P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Terminal number

Wire color

Terminal name

Description

Signal

C35

WHT/BLU

OPPLSW (LINE PRESSURE SWITCH)

Detects line pressure switch signal

With ignition switch ON (II):

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

C37⁽¹⁾

BLU/YEL

OP4SW (TRANSMISSION FLUID PRESSURE SWITCH C (4TH CLUTCH))

Detects transmission fluid pressure switch C (4th clutch) signal

With ignition switch ON (II):

Without 4th clutch pressure: about 5.0 V
With 4th clutch pressure: about 0 V

C37⁽²⁾

BLU/YEL

OP4SW (TRANSMISSION FLUID PRESSURE SWITCH C (4TH CLUTCH))

Detects transmission fluid pressure switch C (4th clutch) signal

With ignition switch ON (II):

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

C38⁽¹⁾

BLU/WHT

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

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

With ignition switch ON (II):

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

C38⁽²⁾

BLU/WHT

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

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

With ignition switch ON (II):

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

C41

BRN/YEL

LG1 (LOGIC GROUND)

Ground circuit for PCM

Less than 0.2 V at all times

C46⁽¹⁾

YEL

ATPS (TRANSMISSION RANGE SWITCH S)

Detects transmission range switch S position signal

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

C46⁽²⁾

YEL

ATPS (TRANSMISSION RANGE SWITCH S)

Detects transmission range switch S position signal

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

NOTE: Check the label on the PCM to see if it was made by Keihin or Continental. Refer to the GENERAL TROUBLESHOOTING INFORMATION for more details.

⁽¹⁾	Keihin PCM

⁽²⁾	Continental PCM