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PCM A/T Control System Inputs and Outputs

Fig 1: Identifying PCM Connector Terminal Locations
G06164300Courtesy of AMERICAN HONDA MOTOR CO., INC.

PCM CONNECTOR A (31P) 

PCM CONNECTOR A (31P) REFERENCE CHART

Terminal number Wire color Terminal name Description Signal
1 BLK PG2 (POWER GROUND) Ground circuit for PCM circuit Less than 1.0 V at all times
2 BLK PG1 (POWER GROUND) Ground circuit for PCM circuit Less than 1.0 V at all times
3 BRN/YEL LG1 (LOGIC GROUND) Ground circuit for PCM circuit Less than 1.0 V at all times
4 YEL/BLK IGP (POWER SOURCE) Power source for PCM circuit With ignition switch ON (II): battery voltage
With ignition switch OFF: about 0 V
10 BLK/YEL VBSOL (POWER SOURCE FOR SOLENOID VALVES) Power source for solenoid valves With ignition switch ON (II): battery voltage
With ignition switch OFF: about 0 V

PCM CONNECTOR B (24P) 

PCM CONNECTOR B (24P) REFERENCE CHART

Terminal number Wire color Terminal name Description Signal
15 BRN/YEL LG2 (LOGIC GROUND) Ground circuit for PCM Less than 1.0 V at all times
19 BLU NC (OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR) Detects output shaft (countershaft) speed sensor signals With ignition switch ON (II): about 0 V or about 5 V
With driving: pulses
23 RED/BLK ATPN (TRANSMISSION RANGE SWITCH N POSITION) Detects transmission range switch N position signal In N: about 0 V
In any other position: battery voltage

PCM CONNECTOR C (22P) 

PCM CONNECTOR C (22P) REFERENCE CHART

Terminal number Wire color Terminal name Description Signal
1 BLU/YEL SHA (SHIFT SOLENOID VALVE A) Drives shift solenoid valve A With engine running in D (in 2nd and 3rd gears), S (in 2nd and 3rd gears), and R: battery voltage
With engine running in P, N, D (in 1st, 4th, and 5th gears), and S (in 1st, 4th, and 5th gears): about 0 V
2 GRN/RED SHD (SHIFT SOLENOID VALVE D) Drives shift solenoid valve D With engine running in N and D: about 0 V
With engine running in P, N, and D: battery voltage In any other position: depending on conditions
3 BLU/YEL ATFT (ATF TEMPERATURE SENSOR) Detects ATF temperature sensor signal With ignition switch ON (II): about 0.2-4.0 V (depending on ATF temperature)
4 GRN/WHT SG1 (SENSOR GROUND) Sensor ground Less than 1.0 V at all times
6 YEL/RED VCC1 (SENSOR VOLTAGE) Provides sensor voltage With ignition switch ON (II): about 5.0 V
With ignition switch OFF: about 0 V
7 RED LSA (A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A) Drives A/T clutch pressure control solenoid valve A With ignition switch ON (II): pulses
8 GRN/WHT SHB (SHIFT SOLENOID VALVE B) Drives shift solenoid valve B With engine running in P, R, N, D (in 1st, 2nd, and 5th gears), and S (in 1st, 2nd, and 5th gears): battery voltage
With engine running in D (in 3rd and 4th gears) and S (in 3rd and 4th gears): about 0 V
9 BLU/WHT OP3SW (3RD CLUTCH TRANSMISSION FLUID PRESSURE SWITCH) Detects 3rd clutch transmission fluid pressure switch input signal With ignition switch ON (II):
  • Without 3rd clutch pressure: about 5.0 V
  • With 3rd clutch pressure: about 0 V
10 YEL/GRN ATPD (TRANSMISSION RANGE SWITCH D POSITION) Detects transmission range switch D position signal input In D: about 0 V
In any position other than D: battery voltage
11 BLU/BLK OP2SW (2ND CLUTCH TRANSMISSION FLUID PRESSURE SWITCH) Detects 2nd clutch transmission fluid pressure switch input signal With ignition switch ON (II):
  • Without 2nd clutch pressure: about 5.0 V
  • With 2nd clutch pressure: about 0 V
12 GRN/YEL SG2 (SENSOR GROUND) Sensor ground Less than 1.0 V at all times
14 YEL/BLU VCC2 (SENSOR VOLTAGE) Provides sensor voltage With ignition switch ON (II): about 5 V
With ignition switch OFF: about 0 V
15 BRN/WHT LSB (A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE B) Drives A/T clutch pressure control solenoid valve B With ignition switch ON (II): pulses
16 GRN SHC (SHIFT SOLENOID VALVE C) Drives shift solenoid valve C With engine running in D (in 1st, 3rd, and 5th gears) and S (in 1st, 3rd, and 5th gears): battery voltage
With engine running in P, R, N, D (in 2nd and 4th gears), and S (in 2nd and 4th gears): about 0 V
18 RED ATPS (TRANSMISSION RANGE SWITCH S) Detects transmission range switch S signal input In S: about 0 V
In any position other than S: battery voltage
19 BLU/YEL ATPFWD (TRANSMISSION RANGE SWITCH FWD POSITION) Detects transmission range switch signal D and S position input signal In D and S: about 0 V
In any position other than D and S: battery voltage
20 BLU/YEL OP4SW (4TH CLUTCH TRANSMISSION FLUID PRESSURE SWITCH) Detects 4th clutch transmission fluid pressure switch input signal With ignition switch ON (II):
  • Without 4th clutch pressure: about 5.0 V
  • With 4th clutch pressure: about 0 V
21 RED/WHT ATPRVS (TRANSMISSION RANGE SWITCH RVS POSITION) Detects transmission range switch P, R, and N position input signal In P, R, and N: about 0V
In any position other than P, R, and N: battery voltage
22 GRIM/RED LSC (A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C) Drives A/T clutch pressure control solenoid valve C With ignition switch ON (II): pulses

PCM CONNECTOR D (17P) 

PCM CONNECTOR D (17P) REFERENCE CHART

Terminal number Wire color Terminal name Description Signal
6 YEL IG1 (IGNITION SIGNAL) Detects ignition signal With ignition switch ON (II): battery voltage
With ignition switch OFF: about 0 V
8 RED NM (INPUT SHAFT (MAINSHAFT) SPEED SENSOR) Detects input shaft (mainshaft) speed sensor signal With ignition switch ON (II): about 0 V or about 5V
With engine running in N: about 2.5 V
12 ORN VBSOL2 (POWER SOURCE FOR SOLENOID VALVES) Power source for solenoid valves With ignition switch ON (II): battery voltage
With ignition switch OFF: about 0 V
13 GRN ATPP (TRANSMISSION RANGE SWITCH P POSITION) Detects transmission range switch P position input signal In P: about 0V
In any position other than P: battery voltage
15 PUR SDNP (PADDLE SHIFTER - (DOWNSHIFT SWITCH)) Detects paddle shifter - (downshift switch) signal With ignition switch ON (II):
  • Paddle shifter - (downshift switch) pressed: about 0V
  • Paddle shifter - (downshift switch) released: battery voltage
16 PUR ATPR (TRANSMISSION RANGE SWITCH R POSITION) Detects transmission range switch R position input signal In R: about 0V
In any position other than R: about 5 V
17 BLU SUPP (PADDLE SHIFTER + (UPSHIFT SWITCH)) Detects paddle shifter + (upshift switch) signal With ignition switch ON (II):
  • Paddle shifter + (upshift switch) pressed: about 0V
  • Paddle shifter - (downshift switch) released: battery voltage

PCM CONNECTOR E (31P) 

PCM CONNECTOR E (31P) REFERENCE CHART

Terminal number Wire color Terminal name Description Signal
5 GRN MRLY (PGM-FI MAIN RELAY) Drives PGM-FI main relay 1 (FI MAIN) Power source for DTC memory With ignition switch ON (II): about 0 V
With ignition switch OFF: battery voltage
8 LTGRN BKSW (BRAKE PEDAL POSITION SWITCH) Detects brake pedal position switch signal With brake pedal released: about 0 V
With brake pedal pressed: battery voltage
15 WHT CANH (CAN COMMUNICATION SIGNAL HIGH) Sends communication signal With ignition switch ON (II): pulses
16 BRN SCS (SERVICE CHECK SIGNAL) Detects service check signal With the service check signal shorted with the HDS: about 0 V
With the service check signal opened: about 5.0 V
22 PNK SLS (SHIFT LOCK SOLENOID) Drives shift lock solenoid With ignition switch ON (II), in P, brake pedal pressed, and accelerator released: about 0 V
26 BLK CANL(CAN COMMUNICATION SIGNAL LOW) Sends communication signal With ignition switch ON (II): pulses
31 GRN METINH (METER DISPLAY INHIBIT SIGNAL) Sends A/T shift position inhibit signal With ignition switch ON (II): about 10.0 V
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