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Home >> Acura >> 2021 >> ILX >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> Engine Control System / Engine Mechanical - Service, Testing And Troubleshooting (Except Hybrid) >> Connector View >> PCM Connector for Inputs and Outputs (2016 2017 2018)
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PCM Connector for Inputs and Outputs (2016 2017 2018)

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) 

GHH468916Courtesy of HONDA, U.S.A., INC.
Terminal number Terminal name Description
1 INJ RLY CL- (INJECTOR RELAY) Drives injector relay
2 F CAN-H (F-CAN COMMUNICATION SIGNAL HIGH) Sends and receives communication signal
3 F CAN-L (F-CAN COMMUNICATION SIGNAL LOW) Sends and receives communication signal
4 Not used  
5 Not used  
6 S-NET (SERIAL COMMUNICATION FOR IMMOBILIZER) Sends and receives communication signal
7 FUEL PUMP RLY CL- (PGM-FI MAIN RELAY 2) Drives PGM-FI main relay 2
8 FI MAIN RLY CL- (PGMFI MAIN RELAY 1/IGNITION COIL RELAY) Drives PGM-FI main relay 1 and ignition coil relay
9 ST CUT RLY1 CL- (STARTER CUT RELAY 1) Drives starter cut relay 1
10 IG1 FUEL PUMP (IGNITION SIGNAL) Detects ignition signal
11 IG1 MISS SOL (POWER SOURCE FOR SOLENOID VALVES) Power source for solenoid valves
12 NEP (ENGINE SPEED PULSE) Outputs engine speed pulse
13 *2 VSP (VEHICLE SPEED SIGNAL OUTPUT) Sends vehicle speed signal
14 *1 VSV (EVAPORATIVE EMISSION (EVAP) CANISTER VENT SHUT VALVE) Drives EVAP canister vent shut valve
15 FAN HI SIGNAL (A/C CONDENSER FAN RELAY/FAN CONTROL RELAY) Drives A/C condenser fan relay and fan control relay
16 FAN LO SIGNAL (RADIATOR FAN RELAY) Drives radiator fan relay
17 SHIFT LOCK SOL (SHIFT LOCK SOLENOID) Drives shift lock solenoid
18 DBW RLY CL- (ELECTRONIC THROTTLE CONTROL SYSTEM (ETCS) CONTROL RELAY) Drives electronic throttle control system (ETCS) control relay
19 INJ RLY OUT (INJECTOR POWER SOURCE) Power source for PCM (injector driver)
20 INJ RLY OUT (INJECTOR POWER SOURCE) Power source for PCM (injector driver)
21 VCC6 (SENSOR VOLTAGE) Provides sensor reference voltage
22 SG6 (SENSOR GROUND) Sensor ground
23 STRLD (STARTER SIGNAL LOAD) Detects starter cut relay signal
24 PD SENSOR (A/C PRESSURE SENSOR) Detects A/C pressure sensor signal
25 Not used  
26 SCS (SERVICE CHECK SIGNAL) Detects service check signal

*1: USA and Canada models*2: With navigation

Terminal number Terminal name Description
27 STOP SW (BRAKE PEDAL POSITION SWITCH) Detects brake pedal position switch signal
28 BKSWNC (BRAKE PEDAL POSITION SWITCH) Detects brake pedal position switch signal
29 ATP-P (TRANSMISSION RANGE SWITCH P POSITION) Detects transmission range switch P position signal
30 Not used  
31 ST CUT RLY2 CL- (STARTER CUT RELAY 2) Drives starter cut relay 2
32 VCC4 (SENSOR VOLTAGE) Provides sensor reference voltage
33 SG4 (SENSOR GROUND) Sensor ground
34 APS1 (ACCELERATOR PEDAL POSITION (APP) SENSOR A) Detects APP sensor A signal
35 *1 PTANK (FUEL TANK PRESSURE (FTP) SENSOR) Detects FTP sensor signal
36 ELD (ELECTRICAL LOAD DETECTOR (ELD)) Detects ELD signal
37 Not used  
38 Not used  
39 STS (STARTER SWITCH SIGNAL) Detects starter switch signal
40 Not used  
41 VCC5 (SENSOR VOLTAGE) Provides sensor reference voltage
42 SG5 (SENSOR GROUND) Sensor ground
43 APS2 (ACCELERATOR PEDAL POSITION (APP) SENSOR B) Detects APP sensor B signal
44 TW2 SENSOR (ENGINE COOLANT TEMPERATURE (ECT) SENSOR 2) Detects ECT sensor 2 signal
45 PADDLE SW UP (PADDLE SHIFTER + (UPSHIFT SWITCH)) Detects paddle shifter + (upshift switch) signal
46 PADDLE SW DOWN (PADDLE SHIFTER - (DOWNSHIFT SWITCH)) Detects paddle shifter - (downshift switch) signal
47 FI SUB RLY CL- (PGM-FI SUBRELAY) Drives PGM-FI subrelay
48 A/C MG CLUTCH RLY CL- (A/C COMPRESSOR CLUTCH RELAY) Drives A/C compressor clutch relay
49 Not used  
50 Not used  
51 Not used  

*1: USA and Canada models*2: With navigation

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

GHH468917Courtesy of HONDA, U.S.A., INC.
Terminal number Terminal name Description
1 PCS (EVAPORATIVE EMISSION (EVAP) CANISTER PURGE VALVE) Drives EVAP canister purge valve
2 Not used  
3 SVSP (INTAKE MANIFOLD TUNING (IMT) ACTUATOR +SIDE) Drives IMT actuator
4 SVSM (INTAKE MANIFOLD TUNING (IMT) ACTUATOR -SIDE) Drives IMT actuator
5 SHA (SHIFT SOLENOID VALVE A) Drives shift solenoid valve A
6 LSE (CLUTCH PRESSURE CONTROL SOLENOID VALVE E) Drives clutch pressure control solenoid valve E
Terminal number Terminal name Description
7 LSA (CLUTCH PRESSURE CONTROL SOLENOID VALVE A) Drives clutch pressure control solenoid valve A
8 LSC (CLUTCH PRESSURE CONTROL SOLENOID VALVE C) Drives clutch pressure control solenoid valve C
9 IGP(ECU) (POWER SOURCE) Power source for PCM
10 Not used  
11 SHB (SHIFT SOLENOID VALVE B) Drives shift solenoid valve B
12 SHC (SHIFT SOLENOID VALVE C) Drives shift solenoid valve C
13 SHE (SHIFT SOLENOID VALVE E) Drives shift solenoid valve E
14 AFHT (AIR FUEL RATIO (A/F) SENSOR (SENSOR 1) HEATER CONTROL) Drives A/F sensor (sensor 1) heater
15 SO2HT (SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S (SENSOR 2) HEATER CONTROL) Drives secondary HO2S (sensor 2) heater
16 HT GND (POWER GROUND) Ground for PCM
17 LSB (CLUTCH PRESSURE CONTROL SOLENOID VALVE B) Drives clutch pressure control solenoid valve B
18 LSD (CLUTCH PRESSURE CONTROL SOLENOID VALVE D) Drives clutch pressure control solenoid valve D
19 LSPLA (LINE PRESSURE CONTROL SOLENOID VALVE) Drives line pressure control solenoid valve
20 GND1 (POWER GROUND) Ground for PCM
21 AFS- (AIR FUEL RATIO (A/F) SENSOR (SENSOR 1) -SIDE) Detects A/F sensor (sensor 1) signal
22 AFS+ (AIR FUEL RATIO (A/F) SENSOR (SENSOR 1) +SIDE) Detects A/F sensor (sensor 1) signal
23 PF (FUEL RAIL PRESSURE SENSOR) Detects fuel rail pressure sensor signal
24 PB (MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR) Detects MAP sensor signal
25 TW (ENGINE COOLANT TEMPERATURE SENSOR (ECT) SENSOR 1) Detects ECT sensor 1 signal
26 TA (INTAKE AIR TEMPERATURE (IAT) SENSOR) Detects IAT sensor signal
27 TATF (ATF TEMPERATURE SENSOR) Detects ATF temperature sensor signal
28 SVM (INTAKE MANIFOLD TUNING (IMT) ACTUATOR SENSOR) Detects IMT actuator sensor signal
29 Not used  
30 SG1 (SENSOR GROUND) Sensor ground
31 VCC1 (SENSOR VOLTAGE) Provides sensor reference voltage
32 NC (OUTPUT SHAFT SPEED SENSOR) Detects output shaft speed sensor signal
33 NM (INPUT SHAFT SPEED SENSOR) Detects input shaft speed sensor signal
34 STRKA (SHIFT FORK A POSITION SENSOR) Detects shift fork A position sensor signal
35 STRKB (SHIFT FORK B POSITION SENSOR) Detects shift fork B position sensor signal
36 STRKC (SHIFT FORK C POSITION SENSOR) Detects shift fork C position sensor signal
37 PCL2 (EVEN CLUTCH PRESSURE SENSOR) Detects EVEN clutch pressure sensor signal
38 PCL1 (ODD CLUTCH PRESSURE SENSOR) Detects ODD clutch pressure sensor signal
39 SG2 (SENSOR GROUND) Sensor ground
40 VCC2 (SENSOR VOLTAGE) Provides sensor reference voltage
41 NEVEN (EVEN GEAR SHAFT SPEED SENSOR) Detects even gear shaft speed sensor signal
42 NODD (ODD GEAR SHAFT SPEED SENSOR) Detects odd gear shaft speed sensor signal
43 CAM (CAMSHAFT POSITION (CMP) SENSOR A) Detects CMP sensor A signal
44 STRKD (SHIFT FORK D POSITION SENSOR) Detects shift fork D position sensor signal
45 PCLR (REVERSE CLUTCH PRESSURE SENSOR) Detects reverse clutch pressure sensor signal
46 SO2 (SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S) (SENSOR 2)) Detects secondary HO2S (sensor 2) signal
47 SO2SG (SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S (SENSOR 2) SENSOR GROUND) Sensor ground for secondary HO2S (sensor 2)
48 LIN (LOCAL INTERCONNECT NETWORK) Sends and receives communication signal
49 SHD (SHIFT SOLENOID VALVE D) Drives shift solenoid valve D
50 VGM (MASS AIR FLOW (MAF) SENSOR -SIDE) Ground for MAF sensor signal
51 VGP (MASS AIR FLOW (MAF) SENSOR +SIDE) Detects MAF sensor signal

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

GHH468918Courtesy of HONDA, U.S.A., INC.
Terminal number Terminal name Description
1 INJ L1 (No. 1 INJECTOR -) Drives No. 1 injector
2 INJ H1 (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 HPUMP H (HIGH PRESSURE FUEL PUMP +) Drives fuel control solenoid (built into high pressure fuel pump)
6 HPUMP L (HIGH PRESSURE FUEL PUMP -) Drives fuel control solenoid (built into high pressure fuel pump)
7 MTR1 (THROTTLE ACTUATOR -SIDE) Ground for throttle actuator
8 MTR2 (THROTTLE ACTUATOR +SIDE) Drives throttle actuator
9 PGM (POWER GROUND) Ground for PCM
10 VBDBW (IGNITION SIGNAL ETCS) Detects ignition signal
11 INJ L2 (No. 2 INJECTOR -) Drives No. 2 injector
12 INJ H2 (No. 2 INJECTOR +) Drives No. 2 injector
13 INJ H3 (No. 3 INJECTOR +) Drives No. 3 injector
14 INJ L3 (No. 3 INJECTOR -) Drives No. 3 injector
15 INJ GND1 (INJECTOR GROUND) Ground for PCM (injector driver)
16 INJ GND2 (INJECTOR GROUND) Ground for PCM (injector driver)
17 GND2 (POWER GROUND) Ground for PCM
18 Not used  
19 IGN02 (No. 2 IGNITION COIL PULSE) Drives No. 2 ignition coil
20 IGN01 (No. 1 IGNITION COIL PULSE) Drives No. 1 ignition coil
21 ATP-FWD1 (TRANSMISSION RANGE SWITCH FWD 1 POSITION) Detects transmission range switch D position signal
22 ATP-RVS1 (TRANSMISSION RANGE SWITCH RVS 1 POSITION) Detects transmission range switch R position signal
23 ATP-D (TRANSMISSION RANGE SWITCH D POSITION) Detects transmission range switch D position signal
24 Not used  
25 *1 VTM (ROCKER ARM OIL PRESSURE SWITCH) Detects rocker arm oil pressure switch signal
26 VTC (VTC OIL CONTROL SOLENOID VALVE) Drives VTC oil control solenoid valve
27 Not used  
28 THL1 (THROTTLE POSITION (TP) SENSOR A) Detects TP sensor A signal
29 THL2 (THROTTLE POSITION (TP) SENSOR B) Detects TP sensor B signal
30 KS GND (KNOCK SENSOR GROUND) Sensor ground for knock sensor
31 KNOCK (KNOCK SENSOR) Detects knock sensor signal
32 ATP-FWD2 (TRANSMISSION RANGE SWITCH FWD 2 POSITION) Detects transmission range switch D position signal
33 ATP-RVS2 (TRANSMISSION RANGE SWITCH RVS 2 POSITION) Detects transmission range switch R position signal

*1: USA and Canada models

Terminal number Terminal name Description
34 ATP-R (TRANSMISSION RANGE SWITCH R POSITION) Detects transmission range switch R position signal
35 Not used  
36 Not used  
37 Not used  
38 Not used  
39 SG3(DBW) (SENSOR GROUND) Ground for PCM (TP sensor)
40 VCC3(DBW) (SENSOR VOLTAGE) Provides sensor reference voltage (TP sensor)
41 Not used  
42 ATP-S (TRANSMISSION RANGE SWITCH N POSITION) Detects transmission range switch S position signal
43 ATP-N (TRANSMISSION RANGE SWITCH N POSITION) Detects transmission range switch N position signal
44 ENG OP SW (OIL PRESSURE SWITCH) Detects engine oil pressure switch signal
45 Not used  
46 VTS (ROCKER ARM OIL CONTROL SOLENOID) Drives rocker arm oil control solenoid
47 Not used  
48 CRKN (CRANKSHAFT POSITION (CKP) SENSOR) Detects CKP sensor signal
49 TDC (CAMSHAFT POSITION (CMP) SENSOR B) Detects CMP sensor B signal
50 IGN03 (No. 3 IGNITION COIL PULSE) Drives No. 3 ignition coil
51 IGN04 (No. 4 IGNITION COIL PULSE) Drives No. 4 ignition coil

*1: USA and Canada models