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Home >> Acura >> 2011 >> RDX 2.3 TB2 >> Repair and Diagnosis >> Engine Performance >> System >> Fuel And Emissions Systems >> System Description >> PCM Inputs and Outputs at PCM Connector B (Δ) (44P)
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PCM Inputs and Outputs at PCM Connector B (Δ) (44P)

Fig 1: Identifying PCM B (Δ) (44P) Connector End View
G08059224Courtesy of AMERICAN HONDA MOTOR CO., INC.
Terminal number Wire color Terminal name Description Signal
1 BLK PG2 (POWER GROUND) Ground circuit for PCM circuit Less than 0.2 V at all times
2 GRN/YEL VTS (ROCKER ARM OIL CONTROL SOLENOID) Drives rocker arm oil control solenoid At idle: about 0 V
3 YEL/BLU PCS (EVAPORATIVE EMISSION (EVAP) CANISTER PURGE VALVE) Drives EVAP canister purge valve With engine running, engine coolant below 140°F (60°C): battery voltage
With engine running, engine coolant above 140°F (60°C): duty controlled
4 BLK/WHT SO2SHTC (SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S) HEATER CONTROL (SENSOR 2)) Drives secondary HO2S heater (sensor 2) With ignition switch ON (II): battery voltage With warmed up engine running: duty controlled
5 GRN/BLK PBMPA (BRAKE BOOSTER PRESSURE) Detects brake booster pressure sensor signal With ignition switch ON (II) and brake pedal released: about 2.0 V
7 YEL/RED OPSW (OIL PRESSURE SWITCH) Detects engine oil pressure signal With ignition switch ON (II): battery voltage With engine running: about 0 V
8 BLU/RED OP2SW (TRANSMISSION FLUID PRESSURE SWITCH A (2ND CLUTCH)) Detects transmission fluid pressure switch A (2nd clutch) signal With engine running:
Without 2nd clutch pressure: about 5.0 V
With 2nd clutch pressure: about 0 V
9 BLU/WHT OP3SW (TRANSMISSION FLUID PRESSURE SWITCH B (3RD CLUTCH)) Detects transmission fluid pressure switch B (3rd clutch) signal With engine running:
Without 3rd clutch pressure: about 5.0 V
With 3rd clutch pressure: about 0 V


Fig 1: PCM Connector B (Δ) (44P) Terminals Layout
G08059225Courtesy of AMERICAN HONDA MOTOR CO., INC.
Terminal number Wire color Terminal name Description Signal
11 BLU/YEL SHA (SHIFT SOLENOID VALVE A) Drives shift solenoid valve A With engine running in D (in 2nd and 3rd gears), S (in 2nd and 3rd gears), and R: battery voltage
With engine running in P, N, D (in 1st, 4th, and 5th gears), and S (in 1st, 4th, and 5th gears): about 0 V
12 RED/BLK ATPN (TRANSMISSION RANGE SWITCH N POSITION) Detects transmission range switch N position signal With ignition switch ON (II), in N: about 0 V
With ignition switch ON (II), in any position other than N: about 5.0 V
13 BLU/BLK ATPP (TRANSMISSION RANGE SWITCH P POSITION) Detects transmission range switch P position signal With ignition switch ON (II), in P: about 0 V
With ignition switch ON (II), in any position other than P: more than 5.0 V
14 WHT ATPR (TRANSMISSION RANGE SWITCH R POSITION) Detects transmission range switch R position signal With ignition switch ON (II), in R: about 0 V
With ignition switch ON (II), in any position other than R: more than 5.0 V
15 RED ATPS (TRANSMISSION RANGE SWITCH S POSITION) Detects transmission range switch S position signal With ignition switch ON (II), in S: about 0 V
With ignition switch ON (II), in any position other than S: battery voltage
16 WHT/BLU SUPP PADDLE SHIFTER + (UPSHIFT SWITCH) Detects paddle shifter (upshift switch) signal With ignition switch ON (II):
  • Paddle shifter (upshift switch) pressed: about 0V
  • Paddle shifter (upshift switch) released: battery voltage
17 RED NM (INPUT SHAFT (MAINSHAFT) SPEED SENSOR) Detects input shaft (mainshaft) speed sensor signal With ignition switch ON (II): about 0 V or about 5.0 V
With engine running in N: about 2.5 V (pulses)
18 YEL/BLU VCC2 (SENSOR VOLTAGE) Provides sensor reference voltage With ignition switch ON (II): about 5.0 V


Fig 1: PCM Connector B (Δ) (44P) Terminals Layout
G08059226Courtesy of AMERICAN HONDA MOTOR CO., INC.
Terminal number Wire color Terminal name Description Signal
20 GRN SHC (SHIFT SOLENOID VALVE C) Drives shift solenoid valve C With engine running in D (in 1st, 3rd, and 5th gears), and S (in 1st, 3rd, and 5th gears): battery voltage
With engine running in P, R, N, D (in 2nd and 4th gears), and S (in 2nd and 4th gears): about 0V
21 YEL ATPD (TRANSMISSION RANGE SWITCH D POSITION) Detects transmission range switch D position signal With ignition switch ON (II), in D: about 0 V With ignition switch ON (II), in any position other than D: battery voltage
22 RED/WHT ATPRVS (TRANSMISSION RANGE SWITCH RVS) Detects transmission range switch RVS signal With ignition switch ON (II), in P, R, and N: about 0 V With ignition switch ON (II), in D and S: battery voltage
23 RED/WHT ECT1 (ENGINE COOLANT TEMPERATURE (ECT) SENSOR 1) Detects ECT sensor 1 signal With ignition switch ON (II): about 0.1-4.8 V (depending on engine coolant temperature)
24 YEL SHD (SHIFT SOLENOID VALVE D) Drives shift solenoid valve D With engine running in N, D, and S during no lock-up conditions: about 0 V
With engine running in P and R, and in D and S during lock-up conditions: battery voltage
25 GRN/RED LSC (A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C) Drives A/T clutch pressure control solenoid valve C With ignition switch ON (II): current controlled
26 GRN/WHT SHB (SHIFT SOLENOID VALVE B) Drives shift solenoid valve B With engine running in P, R, N, D (in 1st, 2nd, and 5th gears), and S (in 1st, 2nd, and 5th gears): battery voltage
With engine running in D (in 3rd and 4th gears), and S (in 3rd and 4th gears): about 0 V
27 BLU/YEL TATF (ATF TEMPERATURE SENSOR) Detects ATF temperature sensor signal With ignition switch ON (II): about 0.2-4.0 V (about 1.8 V at operating temperature, depending on ATF temperature)


Fig 1: PCM Connector B (Δ) (44P) Terminals Layout
G08059227Courtesy of AMERICAN HONDA MOTOR CO., INC.
Terminal number Wire color Terminal name Description Signal
28 BLU/YEL ATPFWD (TRANSMISSION RANGE SWITCH FWD POSITION) Detects transmission range switch FWD signal With ignition switch ON (II), in D and S: about 0 V
With ignition switch ON (II), in any position other than D and S: battery voltage
29 RED/BLK VPMPRLYD (VACUUM PUMP RELAY SIGNAL LOAD) Detects electric vacuum pump signal load At idle with electric vacuum pump off: about 2.3 V
With electric vacuum pump on: about 14.0 V
30 RED/GRN VG+ (MASS AIR FLOW (MAF) SENSOR +SIDE) Detects MAF sensor signal At idle: 1.1-1.6 V (between VG+ terminal and VG-terminal)
31 RED/YEL IAT2 (INTAKE AIR TEMPERATURE (IAT) 2 SENSOR) Detects IAT2 sensor signal With ignition switch ON (II): about 0.1-4.0 V
32 BLK/RED VG-(MASS AIR FLOW (MAF) SENSOR-SIDE) Ground for MAF sensor signal  
33 GRN/YEL SG2 (SENSOR GROUND) Sensor ground Less than 0.2 V at all times
34 WHT VPMPRLY (VACUUM PUMP RELAY) Drives electric vacuum pump relay With electric vacuum pump off: about 0 V
With electric vacuum pump on: about 14.0 V
35 BRN/WHT LSB (A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE B) Drives A/T clutch pressure control solenoid valve B With ignition switch ON (II): current controlled
36 BLK PG1 (POWER GROUND) Ground circuit for PCM circuit Less than 0.2 V at all times
40 BRN/WHT SDNP PADDLE SHIFTER-(DOWNSHIFT SWITCH) Detects paddle shifter-(downshift switch) signal With ignition switch ON (II):
  • Paddle shifter- (downshift switch) pressed: about 0 V
  • Paddle shifter- (downshift switch) released: about 5.0 V
41 WHT/GRN ALTC (ALTERNATOR CONTROL) Sends alternator control signal With warmed up engine running: 5.0 V (depending on electrical load)
42 WHT/BLU ALTL (ALTERNATOR L SIGNAL) Detects alternator L signal With ignition switch ON (II): about 0 V
With engine running: battery voltage
43 WHT/RED ALTF (ALTERNATOR FR SIGNAL) Detects alternator FR signal With engine running: about 2.6-3.4 V (depending on electrical load)
44 RED LSA (A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A) Drives A/T clutch pressure control solenoid valve A With ignition switch ON (II): current controlled
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