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Home >> Acura >> 2017 >> RDX AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System & Engine Mechanical - Testing & Troubleshooting >> Inputs and Outputs >> PCM Connector for Inputs and Outputs (2016-18)

PCM Connector for Inputs and Outputs (2016-18)

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

PCM Inputs and Outputs at PCM Connector A (51P) 

GHH72932Courtesy of HONDA, U.S.A., INC.
Terminal number Terminal name Description
1 IG1 MISS SOL (POWER SOURCE FOR SOLENOID VALVES) Power source for solenoid valves
2 SHIFT LOCK SOL (SHIFT LOCK SOLENOID) Drives shift lock solenoid
3 ST CUT RLY1 CL- (STARTER CUT RELAY 1) Drives starter cut relay 1
4 ST CUT RLY2 CL- (STARTER CUT RELAY 2) Drives starter cut relay 2
5 FAN LO SIGNAL (A/C CONDENSER FAN RELAY) Drives A/C condenser fan relay
6 FAN HI SIGNAL (RADIATOR FAN RELAY/FAN CONTROL RELAY) Drives radiator fan relay and fan control relay
7 FI MAIN RLY CL- (PGM-FI MAIN RELAY 1/IGNITION COIL RELAY) Drives PGM-FI main relay 1 and ignition coil relay
8 FUEL PUMP RLY CL- (PGM-FI MAIN RELAY 2) Drives PGM-FI main relay 2
9 F CAN-H (F-CAN COMMUNICATION A SIGNAL HIGH) Sends and receives communication signal
10 F CAN-L (F-CAN COMMUNICATION A SIGNAL LOW) Sends and receives communication signal
11 Not used  
12 Not used  
13 DBW RLY CL- (ELECTRONIC THROTTLE CONTROL SYSTEM (ETCS) CONTROL RELAY) Drives electronic throttle control system (ETCS) control relay
14 FI SUB RLY CL- (PGM-FI SUBRELAY) Drives PGM-FI subrelay
15*1 VSV (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 Not used  
18 IG1 FUEL PUMP (IGNITION SIGNAL) Detects ignition signal
19 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 ELD (ELECTRICAL LOAD DETECTOR (ELD)) Detects ELD signal
23 A/C MG CLUTCH RLY CL- (A/C COMPRESSOR CLUTCH RELAY) Drives A/C compressor clutch relay
24 BKSWNC (BRAKE PEDAL POSITION SWITCH) Detects brake pedal position switch signal
25*2 STOP SW (BRAKE PEDAL POSITION SWITCH) Detects brake pedal position switch signal
25*3 BRK DIAG (BRAKE PEDAL POSITION SWITCH) Detects brake pedal position switch signal

*1: USA and Canada models*2: Without ACC*3: With ACC

Terminal number Terminal name Description
26 START DIAG (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 SENSOR (ENGINE COOLANT TEMPERATURE (ECT) SENSOR 2) Detects ECT sensor 2 signal
32 FGP (MASS AIR FLOW (MAF) SENSOR +SIDE) Detects MAF sensor signal
33 PADDLE SW UP (PADDLE SHIFTER + (UPSHIFT SWITCH)) Detects paddle shifter + (upshift switch) signal
34 PADDLE SW DOWN (PADDLE SHIFTER - (DOWNSHIFT SWITCH)) Detects paddle shifter - (downshift 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 NEP (ENGINE SPEED PULSE) Outputs engine speed pulse
41 VCC3 (SENSOR VOLTAGE) Provides sensor reference voltage
42 VCC4 (SENSOR VOLTAGE) Provides sensor reference voltage
43 SG3 (SENSOR GROUND Sensor ground
44 SG4 (SENSOR GROUND) Sensor ground
45 APS1 (ACCELERATOR PEDAL POSITION (APP) SENSOR A) Detects APP sensor A signal
46 APS2 (ACCELERATOR PEDAL POSITION (APP) SENSOR B) Detects APP sensor B signal
47 PD SENSOR (A/C PRESSURE SENSOR) Detects A/C pressure sensor signal
48 Not used  
49 VSP (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 ACC*3: With ACC

PCM Inputs and Outputs at PCM Connector B (51P) 

GHH72933Courtesy 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
Terminal number Terminal name Description
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 (A/T 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 INJ1 (No. 1 INJECTOR) Drives No. 1 injector
15 INJ2 (No. 2 INJECTOR) Drives No. 2 injector
16 INJ3 (No. 3 INJECTOR) Drives No. 3 injector
17 INJ4 (No. 4 INJECTOR) Drives No. 4 injector
18 INJ5 (No. 5 INJECTOR) Drives No. 5 injector
19 INJ6 (No. 6 INJECTOR) Drives No. 6 injector
20 GND2 (POWER 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 D and S position signals
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 (TRANSMISSION RANGE SWITCH S POSITION) Detects transmission range switch S position signal
35 Not used  
36 Not used  
37 OPPLSW (LINE PRESSURE SWITCH) Detects line pressure switch signal
38 ATPRVS (TRANSMISSION RANGE SWITCH RVS POSITION) Detects transmission range switch R 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 Inputs and Outputs at PCM Connector C (51P) 

GHH72934Courtesy 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 AFHT B2 (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 Not used  
18 Not used  
19 Not used  
20 GND3 (POWER GROUND) Ground for PCM
21 NC (OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR) Detects output shaft speed (countershaft) 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
Terminal number Terminal name Description
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 Not used  
51 Not used