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Home >> Acura >> 2009 >> TL Base >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Auxiliary Emission Control Systems >> Fuel And Emissions Systems >> System Description >> ECM/PCM Inputs and Outputs at ECM/PCM Connector A (□) (49P)
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ECM/PCM Inputs and Outputs at ECM/PCM Connector A (□) (49P)

Fig 1: Identifying ECM/PCM Connector A (49P) Terminal
G06679422Courtesy of AMERICAN HONDA MOTOR CO., INC.
TERMINAL DESCRIPTION CHART

Terminal number Wire color Terminal name Description Signal
1(2) PUR VBSOL2 (POWER SOURCE FOR SOLENOID VALVES) Power source for solenoid valve With ignition switch ON (II)/vehicle in ON mode: battery voltage
2(1) WHT RVS (REVERSE LOCKOUT SOLENOID) Drives reverse lockout solenoid With vehicle speed below 9 mph (15 km/h): battery voltage
With vehicle speed above 12 mph (20 km/h): about 0 V
2(2) PNK SLS (SHIFT LOCK SOLENOID) Drives shift lock solenoid With ignition switch ON (II)/vehicle in ON mode, in P, brake pedal pressed, and accelerator pedal released: about 0 V
3 LT GRN STRLY (STARTER RELAY) Drives starter cut relay With ignition switch ON (II)/vehicle in ON mode: about 0 V
4 GRN FANL (RADIATOR FAN CONTROL) Drives A/C condenser fan relay With condenser fan running: about 0 V
With condenser fan stopped: battery voltage
5 BRN FANH (RADIATOR FAN CONTROL) Drives radiator fan relay With radiator fan running at high speed: about 0 V
With radiator fan stopped or running at low speed: battery voltage
6 RED MRLY (PGM-FI MAIN RELAY 1) Drives PGM-FI main relay 1 With ignition switch ON (II)/vehicle in ON mode: about 0 V
With ignition switch in LOCK (0)/vehicle in OFF mode: battery voltage
7 ORN BKSWNC (BRAKE PEDAL POSITION SWITCH) Detects brake pedal position switch signal With ignition switch ON (II)/vehicle in ON mode and brake pedal released: battery voltage
With ignition switch ON (II)/vehicle in ON mode and brake pedal pressed: about 0 V
8 LT GRN BKSW (BRAKE PEDAL POSITION SWITCH) Detects brake pedal position switch signal With brake pedal released: about 0 V
With brake pedal pressed: battery voltage
9 LT BLU VG - (MASS AIR FLOW (MAF) SENSOR-SIDE) Ground for MAF sensor signal  
10 BLU ELD (ELECTRICAL LOAD DETECTOR (ELD)) Detects ELD signal With ignition switch ON (II)/vehicle in ON mode: about 0.1-4.8 V (depending on electrical load)
11 GRY IMOFPR (IMMOBILIZER FUEL PUMP RELAY) Drives PGM-FI main relay 2 0 V for 2 seconds after turning ignition switch ON (II)/vehicle in ON mode, then battery voltage
12 LT BLU MCS (ENGINE MOUNT CONTROL SOLENOID VALVE) Drives engine mount control solenoid valve At idle: about 0 V
Above idle: battery voltage
13 GRY ACC (A/C CLUTCH RELAY) Drives A/C clutch relay With compressor ON: about 0 V
With compressor OFF: battery voltage
16 RED ATPP (TRANSMISSION RANGE SWITCH P) Detects transmission range switch P position signal In P: about 0 V
In any position other than P: more than 5.0 V
17(1) PNK MTCLSW (CLUTCH PEDAL POSITION SWITCH A) Detects clutch pedal position switch A signal With vehicle in ON mode and clutch pedal pressed: about 0 V
With vehicle in ON mode and clutch pedal released: battery voltage
18 GRN APSA (ACCELERATOR PEDAL POSITION (APP) SENSOR A) Detects APP sensor A signal With ignition switch ON (II)/vehicle in ON mode and accelerator pedal pressed: about 4.7 V
With ignition switch ON (II)/vehicle in ON mode and accelerator pedal released: about 1.0 V
19 PNK APSB (ACCELERATOR PEDAL POSITION (APP) SENSOR B) Detects APP sensor B signal With ignition switch ON (II)/vehicle in ON mode and accelerator pedal pressed: about 2.3 V
With ignition switch ON (II)/vehicle in ON mode and accelerator pedal released: about 0.5 V
20 BRN VG+(MASS AIR FLOW (MAF) SENSOR +SIDE) Detects MAF sensor signal At idle with warmed up engine and no electrical load: about 1.1-1.6V (between VG+ terminal and VG- terminal)
21 RED ECT2 (ENGINE COOLANT TEMPERATURE (ECT) SENSOR 2) Detects ECT sensor 2 signal With ignition switch ON (II)/vehicle in ON mode: about 0.1-4.8 V (depending on engine coolant temperature)
22 RED VSV (EVAPORATIVE EMISSION (EVAP) CANISTER VENT SHUT VALVE) Drives EVAP canister vent shut valve With ignition switch ON (II)/vehicle in ON mode: battery voltage
23 YEL VBUM (VOLTAGE BACK UP) Power source for ECM/PCM memory Battery voltage at all times
24 RED VCC3 (SENSOR VOLTAGE) Provides sensor reference voltage With ignition switch ON (II)/vehicle in ON mode: about 5.0 V
25 BRN VCC4 (SENSOR VOLTAGE) Provides sensor reference voltage With ignition switch ON (II)/vehicle in ON mode: about 5.0 V
26 BLU SG3 (SENSOR GROUND) Sensor ground Less than 0.2 V at all times
27 GRN SG4 (SENSOR GROUND) Sensor ground Less than 0.2 V at all times
28 PNK STRLD Detects starter cut relay With starter ON: battery voltage
29 WHT ETCSRLY (ELECTRONIC THROTTLE CONTROL SYSTEM (ETCS) CONTROL RELAY) Drives electronic throttle control system (ETCS) control relay With ignition switch ON (II)/vehicle in ON mode: about 0 V
30 BLU VSSOUT (VEHICLE SPEED SIGNAL OUTPUT) Sends vehicle speed signal Depending on vehicle speed: pulses
31 LT GRN STS (STARTER SWITCH SIGNAL) Detects starter switch signal With ignition switch in START (III)/vehicle in START mode: battery voltage
With ignition switch in any position other than START (III)/vehicle in any mode other than START mode: about 0 V
32 ORN SCS (SERVICE CHECK SIGNAL) Detects service check signal With service check signal shorted with the HDS: about 0 V
With service check signal opened: about 5.0 V
33 BLU NEP (ENGINE SPEED PULSE) Outputs engine speed pulse With engine running: pulses
36(2) BRN SUPP (PADDLE SHIFTER + (UPSHIFT SWITCH)) Detects paddle shifter+ (upshift switch) signal With ignition switch ON (II)/vehicle in ON mode, and paddle shifter+ (upshift switch) pressed: about 0 V
With ignition switch ON (II)/vehicle in ON mode, and paddle shifter+ (upshift switch) released: battery voltage
37(2) PUR SDNP (PADDLE SHIFTER - (DOWNSHIFT SWITCH)) Detects paddle shifter- (downshift switch) signal With ignition switch ON (II)/vehicle in ON mode, and paddle shifter- (downshift switch) pressed: about 0 V
With ignition switch ON (II)/vehicle in ON mode, and paddle shifter- (downshift switch) released: battery voltage
39 LT GRN FTP (FUEL TANK PRESSURE (FTP) SENSOR) Detects FTP sensor signal With ignition switch ON (II)/vehicle in ON mode, and fuel fill cap removed: about 2.5 V
40 GRY SUBRLY (PGM-FI SUBRELAY) Drives PGM-FI subrelay With ignition switch ON (II)/vehicle in ON mode: about 0 V
41 BRN LG3 (LOGIC GROUND) Ground circuit for ECM/PCM Less than 0.2 V at all times
42(3) LT BLU FPCD (FUEL PUMP CONTROL MODULE DIAGNOSIS) Detects fuel pump control module diagnosis With ignition switch ON (II)/vehicle in ON mode: about 5.0 V
At idle: about 10.0 V
43(3) PNK FPC (FUEL PUMP CONTROL) Sends fuel pump control module control signal With ignition switch ON (II)/vehicle in ON mode: pulses
With ignition switch OFF/vehicle in OFF mode: about 0 V
44 RED WEN (WRITE ENABLE SIGNAL) Detects write enable signal With ignition switch ON (II)/vehicle in ON mode: about 0 V
46 LT GRN S-NET5V (SERIAL COMMUNICATION FOR IMMOBILIZER) Sends serial communication signal With ignition switch ON (II)/vehicle in ON mode: pulses (about 4.4 V)
With key removed from ignition switch or vehicle in OFF mode: about 1.4 V
47(1) BRN CRMTCLS (CLUTCH PEDAL POSITION SWITCH B) Detects clutch pedal position switch B signal With vehicle in ON mode and clutch pedal pressed: battery voltage
With vehicle in ON mode and clutch pedal released: about 0 V
48 WHT CANH (CAN COMMUNICATION SIGNAL HIGH) Sends communication signal With ignition switch ON (II)/vehicle in ON mode: pulses
49 BLK CANL (CAN COMMUNICATION SIGNAL LOW) Sends communication signal With ignition switch ON (II)/vehicle in ON mode: pulses
(1) M/T
(2) A/T
(3) '09 model with SH-AWD