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DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
PCM Connector For Inputs And Outputs (V6) (2018-19)
2018 Acura TLX Base, 2.4L EngSECTION PCM Connector For Inputs And Outputs (V6) (2018-19)
| 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)
| Terminal number | Terminal name | Description |
|---|---|---|
| 1 | Not used | |
| 2 *1 | CST | Detects signal from DC-DC converter |
| 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 A_H (F-CAN COMMUNICATION A SIGNAL HIGH) | Sends and receives communication signal |
| 10 | F-CAN A_L (F-CAN COMMUNICATION A SIGNAL LOW) | Sends and receives communication signal |
| 11 | F-CAN B_H (F-CAN COMMUNICATION B SIGNAL HIGH) | Sends and receives communication signal |
| 12 | F-CAN B_L (F-CAN COMMUNICATION B SIGNAL LOW) | Sends and receives communication signal |
| 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 *2 | VSV (EVAPORATIVE EMISSION (EVAP) CANISTER VENT SHUT VALVE) | Drives EVAP canister vent shut valve |
| 16 | Not used | |
| 17 | INJ RLY CL- (INJECTOR RELAY) | Drives injector relay |
| 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 | Not used | |
| 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 | 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 | FPCD (FUEL PUMP CONTROL MODULE DIAGNOSIS) | Detects fuel pump control module diagnosis signal |
| 29 | FPC (FUEL PUMP CONTROL) | Sends fuel pump control module control signal |
| 30 *2 | 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 | VGP (MASS AIR FLOW (MAF) SENSOR +SIDE) | Detects MAF sensor signal |
| 33 | Not used | |
| 34 | Not used | |
| 35 | Not used | |
| 36 *1 | MAP SNSR BRAKE VOUT | Detects brake booster pressure sensor signal |
| 37 | Not used | |
| 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 *3 | 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: With auto idle stop system
*2: USA and Canada models
*3: With navigation
PCM Inputs and Outputs at PCM Connector B (Δ) (51P) (female terminals)
| Terminal number | Terminal name | Description |
|---|---|---|
| 1 | IG1 (VBSOL) (POWER SOURCE FOR SOLENOID VALVES) | Power source for solenoid valves |
| 2 | Not used | |
| 3 | Not used | |
| 4 | Not used | |
| 5 | Not used | |
| 6 | Not used | |
| 7 | Not used | |
| 8 | Not used | |
| 9 | Not used | |
| 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 (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 | Not used | |
| 24 | Not used | |
| 25 | Not used | |
| 26 | Not used | |
| 27 | Not used | |
| 28 | Not used | |
| 29 | Not used | |
| 30 | Not used | |
| 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 | Not used | |
| 35 | PF (FUEL RAIL PRESSURE SENSOR) | Detects fuel rail pressure sensor signal |
| 36 | Not used | |
| 37 | Not used | |
| 38 | Not used | |
| 39 | Not used | |
| 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 | Not used | |
| 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 (o) (51P) (female terminals)
| 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 | 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 | Not used | |
| 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 pump return signal |
| 51 | HPTI (HIGH PRESSURE FUEL PUMP) | Detects high pressure fuel pump drive signal |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.