Safety Warning
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.
2021 Acura TLX BaseFACTORY OEM SERVICE PROCEDURE
PCM Connector For Inputs And Outputs (2.0L Engine)
PCM Connector for Inputs and Outputs
| Connector Index |
|---|
| PCM Connector A (50P) |
| PCM Connector E (80P) |
PCM Connector A (50P) (female terminals)
| Terminal number | Terminal name | Description |
|---|---|---|
| 1 | INJ_RLY_OUT (INJECTOR POWER SOURCE) | Power source for PCM (injector driver) |
| 2 | INJ_RLY_OUT (INJECTOR POWER SOURCE) | Power source for PCM (injector driver) |
| 3 | VBACT (TURBOCHARGER WASTEGATE CONTROL ACTUATOR POWER SOURCE) | Power source for PCM (turbocharger wastegate control actuator) |
| 4 | SO2HT (SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S) (SENSOR 2) HEATER CONTROL) | Drives secondary HO2S (Sensor 2) heater |
| 5 | FI_MAIN_RLY_CL- (PGM-FI MAIN RELAY 1) | Drives PGM-FI main relay 1, injector relay, ignition coil relay circuit |
| 6 *1 | VSV (EVAPORATIVE EMISSION (EVAP) CANISTER VENT SHUT VALVE) | Drives EVAP canister vent shut valve |
| 7 | +B_VBS/VBU (VOLTAGE BACK UP) | Power source for PCM memory |
| 8 | FI_MAIN_RLY_OUT (POWER SOURCE) | Power source for PCM |
| 9 | Not used | |
| 10 | LIN(FI-ECU) (LOCAL INTERCONNECT NETWORK) | Sends and receives communication signal |
| 11 | FUEL_PUMP_RLY_CL- (IMMOBILIZER FUEL PUMP RELAY) | Drives fuel pump relay |
| 12 | Not used | |
| 13 | GND (GROUND) | Ground for PCM |
| 14 | DC_STS | Outputs DC-DC converter operation signal |
| 15 | ST_CUT_RLY1_CL- (STARTER CUT RELAY 1) | Drives starter cut relay 1 |
*1: USA and Canada models
| Terminal number | Terminal name | Description |
|---|---|---|
| 16 | DBW_RLY_OUT (POWER SOURCE) | Power source for PCM |
| 17 | FAN_LO_SIGNAL (RADIATOR FAN RELAY) | Drives radiator fan relay |
| 18 | FAN_HI_SIGNAL (A/C CONDENSER FAN RELAY/FAN CONTROL RELAY) | Drives A/C condenser fan relay and fan control relay |
| 19 | START_DIAG (STARTER CUT RELAY RETURN SIGNAL) | Detects starter cut relay signal |
| 20 | PF-CAN C_L (CAN COMMUNICATION SIGNAL LOW) | Sends and receives communication signal |
| 21 | PF-CAN C_H (CAN COMMUNICATION SIGNAL HIGH) | Sends and receives communication signal |
| 22 | FPC (FUEL PUMP DRIVER) | Sends fuel pump driver unit signal |
| 23 | ST_CUT_RLY2_CL- (STARTER CUT RELAY 2) | Drives starter cut relay 2 |
| 24 | Not used | |
| 25 | DBW_RLY_CL- (ELECTRONIC THROTTLE CONTROL SYSTEM (ETCS) CONTROL RELAY) | Drives ETCS control relay |
| 26 | STOP_SW (BRAKE PEDAL POSITION SWITCH) | Detects brake pedal position switch signal |
| 27 | SCS (SERVICE CHECK SIGNAL) | Detects service check signal |
| 28 | STS (STARTER SWITCH SIGNAL) | Detects starter switch signal |
| 29 | Not used | |
| 30 | Not used | |
| 31 | Not used | |
| 32 | APS1 (ACCELERATOR PEDAL POSITION (APP) SENSOR A) | Detects APP sensor A signal |
| 33 | PD_SNSR (A/C PRESSURE SENSOR) | Detects A/C pressure sensor signal |
| 34 | APS2 (ACCELERATOR PEDAL POSITION (APP) SENSOR B) | Detects APP sensor B signal |
| 35 | Not used | |
| 36 | PF-CAN A_L (CAN COMMUNICATION SIGNAL LOW) | Sends and receives communication signal |
| 37 | PF-CAN A_H (CAN COMMUNICATION SIGNAL HIGH) | Sends and receives communication signal |
| 38 | PF-CAN B_L (CAN COMMUNICATION SIGNAL LOW) | Sends and receives communication signal |
| 39 | PF-CAN B_H (CAN COMMUNICATION SIGNAL HIGH) | Sends and receives communication signal |
| 40 | S-NET (SERIAL COMMUNICATION FOR IMMOBILIZER) | Sends serial communication signal |
| 41 | Not used | |
| 42 *1 | PTANK (FUEL TANK PRESSURE (FTP) SENSOR) | Detects FTP sensor signal |
| 43 | SG5 (SENSOR GROUND) | Sensor ground |
| 44 | VCC5 (SENSOR VOLTAGE) | Provides sensor reference voltage |
| 45 | VCC4 (SENSOR VOLTAGE) | Provides sensor reference voltage |
| 46 | SG4 (SENSOR GROUND) | Sensor ground |
| 47 | SO2 (SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S) (SENSOR 2)) | Detects secondary HO2S (Sensor 2) signal |
| 48 | SO2_SG (SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S) (SENSOR 2) SENSOR GROUND) | Sensor ground for secondary HO2S (Sensor 2) |
| 49 | BKSWNC (BRAKE PEDAL POSITION SWITCH) | Detects brake pedal position switch signal |
| 50 | Not used |
*1: USA and Canada models
PCM Connector E (80P) (female terminals)
| Terminal number | Terminal name | Description |
|---|---|---|
| 1 | HPUMP H (HIGH PRESSURE FUEL PUMP +) | Drives fuel control solenoid (built into high pressure fuel pump) |
| 2 | INJH4_65V (No. 4 INJECTOR +) | Drives No. 4 injector |
| 3 | INJL1_65V (No. 1 INJECTOR -) | Drives No. 1 injector |
| 4 | INJL3_65V (No. 3 INJECTOR -) | Drives No. 3 injector |
| 5 | INJH2_65V (No. 2 INJECTOR +) | Drives No. 2 injector |
| 6 | INJH3_65V (No. 3 INJECTOR +) | Drives No. 3 injector |
| 7 | GND5(INJ_GND1) (INJECTOR GROUND) | Ground for PCM (injector driver) |
| 8 | GND6(INJ_GND2) (INJECTOR GROUND) | Ground for PCM (injector driver) |
| 9 | Not used | |
| 10 | Not used | |
| 11 | Not used | |
| 12 | Not used | |
| 13 | AFHT_N (AIR FUEL RATIO (A/F) SENSOR (SENSOR 1) HEATER CONTROL) | Drives A/F sensor (Sensor 1) heater |
| 14 | HPUMP L (HIGH PRESSURE FUEL PUMP -) | Drives fuel control solenoid (built into high pressure fuel pump) |
| 15 | INJH1_65V (No. 1 INJECTOR +) | Drives No. 1 injector |
| 16 | INJL4_65V (No. 4 INJECTOR -) | Drives No. 4 injector |
| 17 | INJL2_65V (No. 2 INJECTOR -) | Drives No. 2 injector |
| 18 | Not used | |
| 19 | Not used | |
| 20 | Not used |
| Terminal number | Terminal name | Description |
|---|---|---|
| 21 | Not used | |
| 22 | GND4 (GROUND) | Ground for PCM |
| 23 | GND3 (GROUND) | Ground for PCM |
| 24 | GND2 (GROUND) | Ground for PCM |
| 25 | WGMTR2 (TURBOCHARGER WASTEGATE CONTROL ACTUATOR - SIDE) | Drives turbocharger wastegate control actuator |
| 26 | WGMTR1 (TURBOCHARGER WASTEGATE CONTROL ACTUATOR + SIDE) | Drives turbocharger wastegate control actuator |
| 27 | MTR1 (THROTTLE ACTUATOR) | Drives throttle actuator |
| 28 | MTR2 (THROTTLE ACTUATOR) | Drives throttle actuator |
| 29 | Not used | |
| 30 | Not used | |
| 31 | ACC (A/C COMPRESSOR CLUTCH RELAY CIRCUIT) | Drives A/C compressor clutch relay circuit |
| 32 | CAM_EX (CAMSHAFT POSITION (CMP) SENSOR B) | Detects CMP sensor B signal |
| 33 | Not used | |
| 34 | KSGND (KNOCK SENSOR GROUND) | Sensor ground for knock sensor |
| 35 | KS (KNOCK SENSOR) | Detects knock sensor signal |
| 36 | IG1 (IGNITION SIGNAL) | Detects ignition signal |
| 37 | IGN01 (No. 1 IGNITION COIL PULSE) | Drives No. 1 ignition coil |
| 38 | IGN02 (No. 2 IGNITION COIL PULSE) | Drives No. 2 ignition coil |
| 39 | IGN03 (No. 3 IGNITION COIL PULSE) | Drives No. 3 ignition coil |
| 40 | IGN04 (No. 4 IGNITION COIL PULSE) | Drives No. 4 ignition coil |
| 41 | Not used | |
| 42 | Not used | |
| 43 | TD_CAM (CAMSHAFT POSITION (CMP) SENSOR A) | Detects CMP sensor A signal |
| 44 | CRKP (CRANKSHAFT POSITION (CKP) SENSOR) | Detects CKP sensor signal |
| 45 | SG6 (SENSOR GROUND) | Sensor ground |
| 46 | VTC(EX) (VTC OIL CONTROL SOLENOID VALVE B) | Drives VTC oil control solenoid valve B |
| 47 | Not used | |
| 48 | IP (AIR FUEL RATIO (A/F) SENSOR (SENSOR 1) IP CELL) | Detects A/F sensor (Sensor 1) pump cell |
| 49 | Not used | |
| 50 | THL1 (THROTTLE POSITION (TP) SENSOR A) | Detects TP sensor A signal |
| 51 | THL2 (THROTTLE POSITION (TP) SENSOR B) | Detects TP sensor B signal |
| 52 | TW (ENGINE COOLANT TEMPERATURE (ECT) SENSOR 1) | Detects ECT sensor 1 signal |
| 53 | TA (INTAKE AIR TEMPERATURE (IAT) SENSOR 1) | Detects IAT sensor 1 signal |
| 54 | TW2 (ENGINE COOLANT TEMPERATURE (ECT) SENSOR 2) | Detects ECT sensor 2 signal |
| 55 | INTA (INTAKE AIR TEMPERATURE (IAT) SENSOR 2) | Detects IAT sensor 2 signal |
| 56 | PB (MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR) | Detects MAP sensor signal |
| 57 | P3 (TURBOCHARGER BOOST SENSOR) | Detects turbocharger boost sensor signal |
| 58 | ENGOPSW (ENGINE OIL PRESSURE SWITCH) | Detects engine oil pressure switch signal |
| 59 | P-OIL (ROCKER ARM OIL PRESSURE SENSOR) | Detects rocker arm oil pressure sensor signal |
| 60 | WGL (TURBOCHARGER WASTEGATE CONTROL ACTUATOR POSITION SENSOR) | Detects turbocharger wastegate control actuator position sensor signal |
| 61 | FGP (MASS AIR FLOW (MAF) SENSOR) | Detects MAF sensor signal |
| 62 | Not used | |
| 63 | VCC6 (SENSOR VOLTAGE) | Provides sensor reference voltage |
| 64 | VTC (VTC OIL CONTROL SOLENOID VALVE A) | Drives VTC oil control solenoid valve A |
| 65 | VTS2 (ROCKER ARM OIL CONTROL SOLENOID) | Drives rocker arm oil control solenoid |
| 66 | Not used |
| Terminal number | Terminal name | Description |
|---|---|---|
| 67 | Not used | |
| 68 | Not used | |
| 69 | Not used | |
| 70 | VCC1 (SENSOR VOLTAGE) | Provides sensor reference voltage |
| 71 | SG1 (SENSOR GROUND) | Sensor ground |
| 72 | PF (FUEL RAIL PRESSURE SENSOR) | Detects fuel rail pressure sensor signal |
| 73 | VS (AIR FUEL RATIO (A/F) SENSOR (SENSOR 1) VS CELL) | Detects A/F sensor (Sensor 1) VS cell |
| 74 | VCENT (AIR FUEL RATIO (A/F) SENSOR (SENSOR 1) VIRTUAL GROUND) | Provides reference voltage for A/F sensor (Sensor 1) |
| 75 | VCC3 (SENSOR VOLTAGE) | Provides sensor reference voltage |
| 76 | SG3 (SENSOR GROUND) | Sensor ground |
| 77 | VCC2 (SENSOR VOLTAGE) | Provides sensor reference voltage |
| 78 | SG2 (SENSOR GROUND) | Sensor ground |
| 79 | ABV (TURBOCHARGER BYPASS CONTROL SOLENOID VALVE) | Drives turbocharger bypass control solenoid valve |
| 80 | PCS (EVAPORATIVE EMISSION (EVAP) CANISTER PURGE VALVE) | Drives EVAP canister purge valve |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.