LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 2021 >> Pilot Elite >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> Engine Control System / Engine Mechanical - Service, Testing & Troubleshooting >> Connector For Inputs And Outputs View >> PCM (6-Speed A/T) (2016 2017 2018 2019 2020)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

PCM (6-Speed A/T) (2016 2017 2018 2019 2020)

PCM Connector for Inputs and Outputs 

Connector Index
PCM Connector A (51P)
PCM Connector B (51P)
PCM Connector C (51P)

PCM Connector A (□) (51P) (female terminals) 

GHH308387Courtesy of HONDA, U.S.A., INC.
Terminal number Terminal name Description
1 IG1 VB SOL (POWER SOURCE FOR SOLENOID VALVES) Power source for solenoid valves
2 SLS (SHIFT LOCK SOLENOID) Drives shift lock solenoid
3 STRLY1 (STARTER CUT RELAY 1) Drives starter cut relay 1
4 STRLY2 (STARTER CUT RELAY 2) Drives starter cut relay 2
5 FAN LO (RADIATOR FAN CONTROL) Drives A/C condenser fan relay
6 FAN HIGH (RADIATOR FAN CONTROL) Drives radiator fan relay and fan control relay
7 M RLY (PGM-FI MAIN RELAY 1/IGNITION COIL RELAY) Drives PGM-FI main relay 1 and ignition coil relay
8 IMOFLR (IMMOBILIZER FUEL PUMP RELAY) Drives PGM-FI main relay 2
9*2 F-CAN_H (F-CAN COMMUNICATION SIGNAL HIGH) Sends and receives communication signal
9*3 F-CAN A_H (CAN COMMUNICATION SIGNAL HIGH) Sends and receives communication signal
10*2 F-CAN_L (F-CAN COMMUNICATION SIGNAL LOW) Sends and receives communication signal
10*3 F-CAN A_L (CAN COMMUNICATION SIGNAL LOW) Sends and receives communication signal
11 Not used  
12 Not used  
13 DBW RLY (ELECTRONIC THROTTLE CONTROL SYSTEM (ETCS) CONTROL RELAY) Drives electronic throttle control system (ETCS) control relay
14 LAF RLY (PGM-FI SUBRELAY) Drives PGM-FI subrelay
15*1 VSS (EVAPORATIVE EMISSION (EVAP) CANISTER VENT SHUT VALVE) Drives EVAP canister vent shut valve
16 ATP-R (TRANSMISSION RANGE SWITCH R POSITION) Detects transmission range switch R position signal
17 INJ RLY (INJECTOR RELAY) Drives injector relay
18 IG1 FUEL PUMP (IGNITION SIGNAL) Detects ignition signal
19*1 VCC6 (SENSOR VOLTAGE) Provides sensor reference voltage
20 SG6 (SENSOR GROUND) Sensor ground
21 VGM (MASS AIR FLOW (MAF) SENSOR -SIDE) Ground for MAF sensor signal
22 Not used  
23 ACC (A/C COMPRESSOR CLUTCH RELAY) Drives A/C compressor clutch relay
24 CANCEL SW (BRAKE PEDAL POSITION SWITCH) Detects brake pedal position switch signal
25 STOP SW (BRAKE PEDAL POSITION SWITCH) Detects brake pedal position switch signal
26 STRLD (STARTER SIGNAL LOAD) Detects starter cut relay signal
27 STS (STARTER SWITCH SIGNAL) Detects starter switch signal
28 Not used  
29 Not used  
30*1 PTANK (FUEL TANK PRESSURE (FTP) SENSOR) Detects FTP sensor signal
31 TW2 SNSR (ENGINE COOLANT TEMPERATURE (ECT) SENSOR 2) Detects ECT sensor 2 signal
32 VGP (MASS AIR FLOW (MAF) SENSOR +SIDE) Detects MAF sensor signal
33 Not used  
34 D4 SW (D4 SWITCH) Detects D4 switch signal
35 Not used  
36 Not used  
37 ATP-P (TRANSMISSION RANGE SWITCH P POSITION) Detects transmission range switch P position signal
38 S-NET (SERIAL COMMUNICATION FOR IMMOBILIZER) Sends and receives communication signal
39 SCS (SERVICE CHECK SIGNAL) Detects service check signal
40 Not used  
41 VCC3 (SENSOR VOLTAGE) Provides sensor reference voltage
42 VCC4 (SENSOR VOLTAGE) Provides sensor reference voltage
43 PGND (SENSOR GROUND) Sensor ground
44 SGND (SENSOR GROUND) Sensor ground
45 AP1 (ACCELERATOR PEDAL POSITION (APP) SENSOR A) Detects APP sensor A signal
46 AP2 (ACCELERATOR PEDAL POSITION (APP) SENSOR B) Detects APP sensor B signal
47 Not used  
48 Not used  
49 VSP OUT (VEHICLE SPEED SIGNAL OUTPUT) Sends vehicle speed signal
50 CRK OUT (CRANKSHAFT POSITION (CKP) OUTPUT SIGNAL) Sends CKP signal to engine mount control unit
51 TDC OUT (CAMSHAFT POSITION (CMP) OUTPUT SIGNAL) Sends CMP signal to engine mount control unit

*1: USA and Canada models

*2: Without CAN gateway

*3: With CAN gateway

PCM Connector B (□) (51P) (female terminals) 

GHH308388Courtesy of HONDA, U.S.A., INC.
Terminal number Terminal name Description
1 IG1(VBSOL) (POWER SOURCE FOR SOLENOID VALVES) Power source for solenoid valves
2 SHA (SHIFT SOLENOID VALVE A) Drives shift solenoid valve A
3 SHC (SHIFT SOLENOID VALVE C) Drives shift solenoid valve C
4 SHB (SHIFT SOLENOID VALVE B) Drives shift solenoid valve B
5 PLA (LINE PRESSURE SOLENOID VALVE A) Drives line pressure solenoid valve A
6 LSA (A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A) Drives A/T clutch pressure control solenoid valve A
7 LSB (A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE B) Drives A/T clutch pressure control solenoid valve B
8 LSC (A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C) Drives A/T clutch pressure control solenoid valve C
9 LSD (AT CLUTCH PRESSURE CONTROL SOLENOID VALVE D) Drives A/T clutch pressure control solenoid valve D
10 IGP (POWER SOURCE) Power source for PCM
11 GND1 (POWER GROUND) Ground for PCM
12 Not used  
13 Not used  
14 INJ Ti 1 (No. 1 INJECTOR CONTROL DRIVE SIGNAL) No. 1 injector drive signal
15 INJ Ti 2 (No. 2 INJECTOR CONTROL DRIVE SIGNAL) No. 2 injector drive signal
16 INJ Ti 3 (No. 3 INJECTOR CONTROL DRIVE SIGNAL) No. 3 injector drive signal
17 INJ Ti 4 (No. 4 INJECTOR CONTROL DRIVE SIGNAL) No. 4 injector drive signal
18 INJ Ti 5 (No. 5 INJECTOR CONTROL DRIVE SIGNAL) No. 5 injector drive signal
19 INJ Ti 6 (No. 6 INJECTOR CONTROL DRIVE SIGNAL) No. 6 injector drive signal
20 GND2 LG (LOGIC GROUND) Ground for PCM
21 IGN PULSE5 (No. 5 IGNITION COIL PULSE) Drives No. 5 ignition coil
22 IGN PULSE6 (No. 6 IGNITION COIL PULSE) Drives No. 6 ignition coil
23 ATPD (TRANSMISSION RANGE SWITCH D POSITION) Detects transmission range switch D position signal
24 OP2SW (TRANSMISSION FLUID PRESSURE SWITCH A (2ND CLUTCH)) Detects transmission fluid pressure switch A (2nd clutch) signal
25 OP3SW (TRANSMISSION FLUID PRESSURE SWITCH B (3RD CLUTCH)) Detects transmission fluid pressure switch B (3rd clutch) signal
26 OP4SW (TRANSMISSION FLUID PRESSURE SWITCH C (4TH CLUTCH)) Detects transmission fluid pressure switch C (4th clutch) signal
27 OP5SW (TRANSMISSION FLUID PRESSURE SWITCH D (5TH CLUTCH)) Detects transmission fluid pressure switch D (5th clutch) signal
28 OP6SW (TRANSMISSION FLUID PRESSURE SWITCH E (6TH CLUTCH)) Detects transmission fluid pressure switch E (6th clutch) signal
29 ATPFWD (TRANSMISSION RANGE SWITCH FWD POSITION) Detects transmission range switch FWD position signal
30 ATPN (TRANSMISSION RANGE SWITCH N POSITION) Detects transmission range switch N position signal
31 THL1 (THROTTLE POSITION (TP) SENSOR A) Detects TP sensor A signal
32 IGN PULSE3 (No. 3 IGNITION COIL PULSE) Drives No. 3 ignition coil
33 IGN PULSE4 (No. 4 IGNITION COIL PULSE) Drives No. 4 ignition coil
34 ATPS(ATPL) (TRANSMISSION RANGE SWITCH L POSITION) Detects transmission range switch L position signal
35 PF (FUEL RAIL PRESSURE SENSOR) Detects fuel rail pressure sensor signal
36 Not used  
37 OPPLSW (LINE PRESSURE SWITCH) Detects line pressure switch signal
38 ATPRVS (TRANSMISSION RANGE SWITCH RVS POSITION) Detects transmission range switch RVS position signal
39 TATF (ATF TEMPERATURE SENSOR) Detects ATF temperature sensor signal
40 THL2 (THROTTLE POSITION (TP) SENSOR B) Detects TP sensor B signal
41 IGN PULSE1 (No. 1 IGNITION COIL PULSE) Drives No. 1 ignition coil
42 IGN PULSE2 (No. 2 IGNITION COIL PULSE) Drives No. 2 ignition coil
43 VCC2 (SENSOR VOLTAGE) Provides sensor reference voltage
44 VCC5 (SENSOR VOLTAGE) Provides sensor reference voltage
45 SG2 (SENSOR GROUND) Sensor ground
46 SG5 (SENSOR GROUND) Sensor ground
47 OP SENSOR (ENGINE OIL PRESSURE) Detects rocker arm oil pressure sensor signal
48 NM (INPUT SHAFT (MAINSHAFT) SPEED SENSOR) Detects input shaft (mainshaft) speed sensor signal
49 Not used  
50 LIN (LOCAL INTERCONNECT NETWORK) Sends and receives communication signal
51 TDC (CAMSHAFT POSITION (CMP) SENSOR) Detects CMP sensor signal

PCM Connector C (□) (51P) (female terminals) 

GHH308389Courtesy of HONDA, U.S.A., INC.
Terminal number Terminal name Description
1 PGM (POWER GROUND) Ground for PCM
2 MTR2 (THROTTLE ACTUATOR +SIDE) Drives throttle actuator
3 MTR1 (THROTTLE ACTUATOR -SIDE) Ground for throttle actuator
4 IG1M (IGNITION SIGNAL ETCS) Detects ignition signal
5 SO2HT B1 (REAR SECONDARY HEATED OXYGEN SENSOR (REAR SECONDARY HO2S (BANK 1, SENSOR 2) HEATER CONTROL) Drives rear secondary HO2S (Bank 1, sensor 2) heater
6 AFHT B1 (REAR AIR FUEL RATIO (REAR A/F) SENSOR (BANK 1, SENSOR 1) HEATER CONTROL) Drives rear A/F sensor (Bank 1, sensor 1) heater
7 SO2HT B2 (FRONT SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S (BANK 2, SENSOR 2) HEATER CONTROL) Drives front secondary HO2S (Bank 2, sensor 2) heater
8 AFHTB2 (FRONT AIR FUEL RATIO (FRONT A/F) SENSOR (BANK 2, SENSOR 1) HEATER CONTROL) Drives front A/F sensor (Bank 2, sensor 1) heater
9 Not used  
10 Not used  
11 CRK (CRANKSHAFT POSITION (CKP) SENSOR) Detects CKP sensor signal
12 PCS (EVAPORATIVE EMISSION (EVAP) CANISTER PURGE VALVE) Drives EVAP canister purge valve
13 E EGR (EXHAUST GAS RECIRCULATION (EGR) VALVE) Drives EGR valve
14 CSS (ROCKER ARM OIL CONTROL SOLENOID B (BANK 1)) Drives rocker arm oil control solenoid B (Bank 1)
15 VTSB1 (ROCKER ARM OIL CONTROL SOLENOID A (BANK 1)) Drives rocker arm oil control solenoid A (Bank 1)
16 VTSB2 (ROCKER ARM OIL CONTROL SOLENOID A (BANK 2)) Drives rocker arm oil control solenoid A (Bank 2)
17 INJF1 (INJECTOR DIAG SIGNAL1) No. 1, No. 5 injector return signal
18 INJF2 (INJECTOR DIAG SIGNAL2) No. 3, No. 4 injector return signal
19 INJF3 (INJECTOR DIAG SIGNAL3) No. 2, No. 6 injector return signal
20 GND3 (POWER GROUND) Ground for PCM
21 NC (OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR) Detects output shaft (countershaft) speed sensor signal
22 VTMB1 (ROCKER ARM OIL PRESSURE SWITCH A (BANK 1)) Detects rocker arm oil pressure switch A (Bank 1) signal
23 VTMB2 (ROCKER ARM OIL PRESSURE SWITCH A (BANK 2)) Detects rocker arm oil pressure switch A (Bank 2) signal
24 Not used  
25 VSB1 (VS CELL + BANK 1) Detects rear A/F sensor (Bank 1, sensor 1) VS cell signal
26 VCENTB1 (VIRTUAL GROUND BANK 1) Provides reference voltage for rear A/F sensor (Bank 1, sensor 1)
27 Not used  
28 VSB2 (VS CELL + BANK 2) Detects front A/F sensor (Bank 2, sensor 1) VS cell signal
29 VCENTB2 (VIRTUAL GROUND BANK 2) Provides reference voltage for front A/F sensor (Bank 2, sensor 1)
30 SO2B1 (REAR SECONDARY HEATED OXYGEN SENSOR (REAR SECONDARY HO2S (BANK 1, SENSOR 2))) Detects rear secondary HO2S (Bank 1, sensor 2) signal
31 SO2B2 (FRONT SECONDARY HEATED OXYGEN SENSOR (FRONT SECONDARY HO2S (BANK 2, SENSOR 2))) Detects front secondary HO2S (Bank 2, sensor 2) signal
32 VCC1 (SENSOR VOLTAGE) Provides sensor reference voltage
33 SG1 (SENSOR GROUND) Sensor ground
34 VCMSW (ROCKER ARM OIL PRESSURE SWITCH B (BANK 1)) Detects rocker arm oil pressure switch B (Bank 1) signal
35 Not used  
36 Not used  
37 IPB1 (IP CELL + BANK 1) Detects rear A/F sensor (Bank 1, sensor 1) pump cell signal
38 IPB2 (IP CELL + BANK 2) Detects front A/F sensor (Bank 2, sensor 1) pump cell signal
39 SO2SGB1 (REAR SECONDARY HEATED OXYGEN SENSOR (REAR SECONDARY HO2S (BANK 1, SENSOR 2)) SENSOR GROUND) Sensor ground for rear secondary HO2S (Bank 1, sensor 2)
40 SO2SGB2 (FRONT SECONDARY HEATED OXYGEN SENSOR (FRONT SECONDARY HO2S (BANK 2, SENSOR 2)) SENSOR GROUND) Sensor ground for front secondary HO2S (Bank 2, sensor 2)
41 KSB1 (KNOCK SENSOR 1 (BANK 1)) Detects knock sensor 1 (Bank 1) signal
42 KSSGB1 (KNOCK SENSOR 1 (BANK 1) GROUND) Sensor ground for knock sensor 1 (Bank 1)
43 KSB2 (KNOCK SENSOR 2 (BANK 2)) Detects knock sensor 2 (Bank 2) signal
44 KSSGB2 (KNOCK SENSOR 2 (BANK 2) GROUND) Sensor ground for knock sensor 2 (Bank 2)
45 PB (MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR) Detects MAP sensor signal
46 EGRL (EXHAUST GAS RECIRCULATION (EGR) VALVE POSITION SENSOR) Detects EGR valve position sensor signal
47 Not used  
48 TW (ENGINE COOLANT TEMPERATURE SENSOR (ECT) SENSOR 1) Detects ECT sensor 1 signal
49 TA (INTAKE AIR TEMPERATURE (IAT) SENSOR) Detects IAT sensor signal
50 FPF (HIGH PRESSURE FUEL PUMP) Detects high pressure fuel control solenoid return signal
51 HPTI (HIGH PRESSURE FUEL PUMP) Detects high pressure fuel control solenoid drive signal