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

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

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