LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 2021 >> CR-V LX, AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> Remove, Overhaul & Install >> Engine Control System / Engine Mechanical - Testing & Troubleshooting (Except Hybrid) >> Connector View >> PCM Connector for Inputs and Outputs (2.4 L Engine) (2017 2018 2019)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

PCM Connector for Inputs and Outputs (2.4 L Engine) (2017 2018 2019)

PCM Connector for Inputs and Outputs 

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

PCM Inputs and Outputs at PCM Connector A (□) (51P) (female terminals) 

GHH426918Courtesy of HONDA, U.S.A., INC.
Terminal number Terminal name Description
1 F-CAN L (F-CAN COMMUNICATION SIGNAL LOW) Sends and receives communication signal
2 F-CAN H (F-CAN COMMUNICATION SIGNAL HIGH) Sends and receives communication signal
3 FI MAIN RLY CL- (PGM-FI MAIN RELAY 1) Drives PGM-FI main relay 1
4 IG1 FUEL PUMP (IGNITION SIGNAL) Detects ignition signal
5 FI MAIN RLY OUT (POWER SOURCE) Power source for PCM
6 INJ RLY OUT (INJECTOR POWER SOURCE) Power source for PCM (injector driver)
7 INJ RLY OUT (INJECTOR POWER SOURCE) Power source for PCM (injector driver)
8 Not used  
9 FAN LO SIGNAL (RADIATOR FAN CONTROL) Drives radiator fan relay
10 FAN HI SIGNAL (RADIATOR FAN CONTROL) Drives A/C condenser fan relay and fan control relay
11 IG1 MISS SOL (POWER SOURCE FOR PCM) Power source for PCM
12 SHIFT LOCK SOL (SHIFT LOCK SOLENOID) Drives shift lock solenoid
13 A/C MG CLUTCH RLY CL- (A/C COMPRESSOR CLUTCH RELAY) Drives A/C compressor clutch relay
14 FUEL PUMP RLY CL- (FUEL PUMP RELAY) Drives PGM-FI main relay 2
15 INJ RLY CL- (INJECTOR DRIVER RELAY) Drives injector relay
16 Not used  
17 *1 VSV (EVAPORATIVE EMISSION (EVAP) CANISTER VENT SHUT VALVE) Drives EVAP canister vent shut valve
18 ACC/IG2 CUT RELAY CL- (ACC/IG2 CUT RELAY) Drive ACC cut relay and IG2 cut relay
19 DBW RLY- (ELECTRONIC THROTTLE CONTROL SYSTEM (ETCS) CONTROL RELAY) Drives PGM-FI subrelay
20 Not used  
21 S-NET (SERIAL COMMUNICATION FOR IMMOBILIZER) Sends and receives communication signal
22 Not used  
23 Not used  

*1: USA models

Terminal number Terminal name Description
24 BKSWNC (BRAKE PEDAL POSITION SWITCH) Detects brake pedal position switch signal
25 VSP (VEHICLE SPEED SIGNAL OUTPUT) Sends vehicle speed signal
26 Not used  
27 Not used  
28 SG6 (SENSOR GROUND) Sensor ground
29 VCC6 (SENSOR VOLTAGE) Provides sensor reference voltage
30 SG4 (SENSOR GROUND)  
31 VCC4 (SENSOR VOLTAGE) Provides sensor reference voltage
32 Not used  
33 ST CUT RLY1 CL- (STARTER CUT RELAY 1) Drives starter cut relay 1
34 ST CUT RLY2 CL- (STARTER CUT RELAY 2) Drives starter cut relay 2
35 Not used  
36 Not used  
37 STOP SW (BRAKE PEDAL POSITION SWITCH) Detects brake pedal position switch signal
38 APS2 (ACCELERATOR PEDAL POSITION (APP) SENSOR B) Detects APP sensor B signal
39 SG5 (SENSOR GROUND) Sensor ground
40 VCC5 (SENSOR VOLTAGE) Provides sensor reference voltage
41 PD SENSOR (A/C PRESSURE SENSOR) Detects A/C pressure sensor signal
42 *1 PTANK (FUEL TANK PRESSURE (FTP) SENSOR) Detects FTP sensor signal
43 TW2 SENSOR (ENGINE COOLANT TEMPERATURE (ECT) SENSOR 2) Detects ECT sensor 2 signal
44 Not used  
45 APS1 (ACCELERATOR PEDAL POSITION (APP) SENSOR A) Detects APP sensor A signal
46 Not used  
47 START DIAG (STARTER SIGNAL LOAD) Detects starter signal
48 SCS (SERVICE CHECK SIGNAL) Detects service check signal
49 Not used  
50 Not used Detects clutch pedal position switch B signal
51 Not used  

*1: USA models

PCM Inputs and Outputs at PCM Connector B (□) (51P) (female terminals) 

GHH426919Courtesy of HONDA, U.S.A., INC.
Terminal number Terminal name Description
1 INJ H1 (No. 1 INJECTOR +) Drives No. 1 injector
2 INJ L1 (No. 1 INJECTOR -) Drives No. 1 injector
3 INJ H4 (No. 4 INJECTOR +) Drives No. 4 injector
4 INJ L4 (No. 4 INJECTOR -) Drives No. 4 injector
5 INJ H2 (No. 2 INJECTOR +) Drives No. 2 injector
6 INJ L2 (No. 2 INJECTOR -) Drives No. 2 injector
7 INJ H3 (No. 3 INJECTOR +) Drives No. 3 injector
8 INJ L3 (No. 3 INJECTOR -) Drives No. 3 injector
9 GND INJ 1 (INJECTOR GROUND) Ground for PCM (injector driver)
10 GND INJ 2 (INJECTOR GROUND) Ground for PCM (injector driver)
11 GND1 (PCM GROUND) Ground for PCM
12 GND2 (PCM GROUND) Ground for PCM
13 Not used  
14 Not used  
15 PCS (EVAPORATIVE EMISSION (EVAP) CANISTER PURGE VALVE) Drives EVAP canister purge valve
16 Not used  
17 Not used  
18 VTS (ROCKER ARM OIL CONTROL SOLENOID) Drives rocker arm oil control solenoid
19 Not used  
20 Not used  
21 *1 VTM (ROCKER ARM OIL PRESSURE SWITCH) Detects rocker arm oil pressure switch signal
22 Not used  
23 Not used  
24 IGN01 (No. 1 IGNITION COIL PULSE) Drives No. 1 ignition coil
25 IGN02 (No. 2 IGNITION COIL PULSE) Drives No. 2 ignition coil
26 IGN03 (No. 3 IGNITION COIL PULSE) Drives No. 3 ignition coil
27 IGN04 (No. 4 IGNITION COIL PULSE) Drives No. 4 ignition coil
28 Not used  
29 Not used  
30 TDC (CAMSHAFT POSITION (CMP) SENSOR B) Detects CMP sensor B signal
31 Not used  
32 VGP (MASS AIR FLOW (MAF) SENSOR +SIDE) Detects MAF sensor signal
33 VGM (MASS AIR FLOW (MAF) SENSOR -SIDE) Ground for MAF sensor
34 ENG OP SW (OIL PRESSURE SWITCH) Detects oil pressure switch signal
35 Not used  
36 Not used  
37 Not used  
38 CRKN (CRANKSHAFT POSITION (CKP) SENSOR) Detects CKP sensor signal
39 CAM (CAMSHAFT POSITION (CMP) SENSOR A) Detects CMP sensor A signal
40 LIN (LOCAL INTERCONNECT NETWORK) Sends and receives communication signal
41 Not used  
42 Not used  
43 Not used  
44 Not used  
45 Not used  
46 THL1 (THROTTLE POSITION (TP) SENSOR A) Detects TP sensor A signal
47 THL2 (THROTTLE POSITION (TP) SENSOR B) Detects TP sensor B signal

*1: USA models

Terminal number Terminal name Description
48 VCC3 (SENSOR VOLTAGE) Provides sensor reference voltage
49 SG3 (DBW) (SENSOR GROUND) Sensor ground
50 TW (ENGINE COOLANT TEMPERATURE (ECT) SENSOR 1) Detects ECT sensor 1 signal
51 TA (INTAKE AIR TEMPERATURE (IAT) SENSOR) Detects IAT sensor signal

*1: USA models

PCM Inputs and Outputs at PCM Connector C (o) (51P) (female terminals) 

GHH426920Courtesy of HONDA, U.S.A., INC.
Terminal number Terminal name Description
1 PGM (POWER GROUND ETCS) Ground for PCM
2 VBDBW (IGNITION SIGNAL ETCS) Detects ignition signal
3 LC LS (CVT LOCK-UP CLUTCH CONTROL SOLENOID VALVE) Drives CVT lock-up clutch control solenoid valve
4 DR LS (CVT DRIVE PULLEY PRESSURE CONTROL SOLENOID VALVE) Drives CVT drive pulley pressure control solenoid valve
5 CPC LS (CVT CLUTCH PRESSURE CONTROL SOLENOID VALVE) Drives CVT clutch pressure control solenoid valve
6 VTC (VTC OIL CONTROL SOLENOID VALVE) Drives VTC oil control solenoid valve
7 AFHT (AIR FUEL RATIO (A/F) SENSOR (SENSOR 1) HEATER CONTROL) Drives A/F sensor (sensor 1) heater
8 GND3 (PCM GROUND) Ground for PCM
9 SO2 HT (SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S) (SENSOR 2) HEATER) Drives secondary HO2S (sensor 2) heater
10 DN LS (CVT DRIVEN PULLEY PRESSURE CONTROL SOLENOID VALVE) Drives CVT driven pulley pressure control solenoid valve
11 MTR1 (THROTTLE ACTUATOR -SIDE) Ground for throttle actuator
12 MTR2 (THROTTLE ACTUATOR +SIDE) Drives throttle actuator
13 HPUMP H (HIGH PRESSURE FUEL PUMP +) Drives high pressure fuel pump
14 HPUMP L (HIGH PRESSURE FUEL PUMP -) Drives high pressure fuel pump
15 Not used  
16 Not used  
17 SOL C (SHIFT SOLENOID VALVE O/P) Drives shift solenoid valve O/P
18 Not used  
19 SOL B (SHIFT SOLENOID VALVE B) Drives shift solenoid valve B
20 Not used  
21 NT (TORQUE CONVERTER TURBINE SPEED SENSOR) Detects torque converter turbine speed sensor signal
22 Not used  
23 ATP RVS (TRANSMISSION RANGE SWITCH RVS POSITION) Detects transmission range switch R position signal
24 ATP N (TRANSMISSION RANGE SWITCH N POSITION) Detects transmission range switch N position signal
Terminal number Terminal name Description
25 ATP D (TRANSMISSION RANGE SWITCH D POSITION) Detects transmission range switch D position signal
26 ATP FWD (TRANSMISSION RANGE SWITCH FWD POSITION) Detects transmission range switch FWD position signal
27 ATP R (TRANSMISSION RANGE SWITCH R POSITION) Detects transmission range switch R position signal
28 KSGND (KNOCK SENSOR GROUND) Sensor ground for knock sensor
29 KS (KNOCK SENSOR) Detects knock sensor signal
30 VCC2 (SENSOR VOLTAGE) Provides sensor reference voltage
31 SG2 (SENSOR GROUND) Sensor ground
32 VELL DD (CVT SPEED SENSOR) Detects CVT speed sensor signal
33 NDR DD (CVT DRIVE PULLEY SPEED SENSOR) Detects CVT drive pulley speed sensor signal
34 ATP P (TRANSMISSION RANGE SWITCH P POSITION) Detects transmission range switch P position signal
35 Not used  
36 Not used  
37 TATF (TRANSMISSION FLUID TEMPERATURE SENSOR) Detects transmission fluid temperature sensor signal
38 SO2 (SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S) (SENSOR 2)) Detects secondary HO2S (sensor 2) signal
39 SO2SG (SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S (SENSOR 2)) SENSOR GROUND) Sensor ground for secondary HO2S (sensor 2)
40 Not used  
41 VCC1 (SENSOR VOLTAGE) Provides sensor reference voltage
42 SG1 (SENSOR GROUND) Sensor ground
43 ATP S (TRANSMISSION RANGE SWITCH S POSITION) Detects transmission range switch S position signal
44 ATP L (TRANSMISSION RANGE SWITCH L POSITION) Detects transmission range switch L position signal
45 PB (MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR) Detects MAP sensor signal
46 PF (FUEL RAIL PRESSURE SENSOR) Detects fuel rail pressure sensor signal
47 AFS- (AIR FUEL RATIO (A/F) SENSOR (SENSOR 1) -SIDE) Detects A/F sensor (sensor 1) signal
48 AFS+ (AIR FUEL RATIO (A/F) SENSOR (SENSOR 1) +SIDE) Detects A/F sensor (sensor 1) signal
49 PDN (CVT DRIVEN PULLEY PRESSURE SENSOR) Detects CVT driven pulley pressure sensor signal
50 Not used  
51 Not used