# 1995 Honda Accord ## ECU pinout 37820-P0A-A51 ![Connector Pinout](Images/Accord_pinout.png) [94 accord ex ecu pinout](http://honda-tech.com/showthread.php?t=2377726) ## 26 pin | | | | | | | --- | ------------------------------------ | --------- | --------------------------------------------------------------- | ---------------------------- | | A1 | W63 | BRowN | Injector \#1 | Output | | A2 | W64 | YEL | Injector \#4 | Output | | A3 | W61 | RED | Injector \#2 | Output | | A4 | W62 | GRN/YEL | VTEC Solenoid Valve | Output | | A5 | W59 | BLUe | Injector \#3 | Output | | A6 | W60 | ORG/BLK | O2 Heater | Output, sink/low | | A7 | W57 | GRN/BLK | Fuel Pump Relay | Output, sink/low | | A8 | W58 | \* | \* | \* | | A9 | W55 | BLK/BLU | Idle Air Control Valve | Output, sink/low. 500Hz | | A10 | W56 | GRN/WHT | Engine Mount Control | Output | | A11 | W53 | RED | EGR SOL | Output | | A12 | W54 | GReeN | Radiator Fan Control Module | Output | | A13 | W51 | LTGRN/RED | MIL | Output, low-side | | A14 | W52 | WHT/YEL | Fuel Injection Air Control | | | A15 | W49 | RED/BLU | A/C compressor clutch relay | Output | | A16 | W50 | WHT/GRN | Alternator Control | | | A17 | W47 | \* | \* | \* | | A18 | W48 | BRN/WHT | FAS (TCM) | | | A19 | W45 | ORG/GRN | Intake Air Resonator Control Solenoid valve | Output | | A20 | W46 | RED/YEL | PCS | | | A21 | W43 | YEL/GRN | Ignition Control Module | Output, \~12v | | A22 | W44 | \* | \* | \* | | A23 | W41 | BLK | Power Ground | Ground | | A24 | W42 | BLK | Power Ground | Ground | | A25 | W39 | YEL/BLK | Power Source | Input, +12 if ignition is on | | A26 | W40 | BRN/BLK | Logic Ground | Ground | ## 16 pin | | | | | | | --- | ---- | -------------------- | -------------------------------------------------- | --------------------------------------------------------- | | B1 | W37 | YEL/BLK | Power Source | Input, constant +12V | | B2 | W38 | BRN/BLK | Logic Ground | Ground | | B3 | W35 | WHT/RED | AFS A (TCM) Up/Down shift signal | | | B4 | W36 | GRN | AFS B (TCM) Up/Down shift signal | | | B5 | W33 | RED/WHT | AC Pres Switch | | | B6 | W34 | \* | \* | \* | | B7 | W31 | lightLTGRN | AT Gear Pos Part/Neutral | Input | | B8 | W32 | GRN | Power Steering Pres Sw | Input, indicates high power steering load | | B9 | W29 | BLU RED (or BLK/GRN) | STS | | | B10 | W30 | ORG | Vehicle Speed Sensor | Input (grounded 4 times per speedometer cable revolution) | | B11 | W27 | ORanGe | CYP Signal | Input, one pulse per cam rev | | B12 | W28 | WHT | CYP Ground | | | B13 | CAM- | ORG BLU | TDC Signal | Input, four pulses per cam revolution | | B14 | CAM+ | WHT BLU | TDC Ground | | | B15 | CNK- | BLU GRN | CKP Signal | Input, 24 pulses per cam | | B16 | CNK+ | BLU YEL | CKP Ground | | ## 22 pin | | | | | | | --- | ------------------------------------ | -------------- | -------------------------------------------------- | ------------------------------------------- | | D1 | W21 | WHT YEL | Voltage Back Up | Input, constant +12V | | D2 | W22 | | Brake Switch | Input | | D3 | W19 | \* | \* | \* | | D4 | W20 | RED | Service Check Signal | Input, ground to activate | | D5 | W17 | BLU/WHT | Baro OUT | | | D6 | W18 | BLU/BLK | VTEC Pressure Switch | Input | | D7 | W15 | lightLTGRN RED | TXD/RXD data link | | | D8 | W16 | \* | \* | \* | | D9 | W13 | WHT RED | ALT FR Signal | | | D10 | W14 | GRN RED | Electrical Load Detector | Input (signals headlight, radio etc) | | D11 | W11 | RED/BLK | Throttle Position Sensor | Input | | D12 | W12 | WHT/BLK | EGR Lift Sensor | Input | | D13 | W9 | RED/WHT | Engine Coolant Temperature Sensor | Input | | D14 | W10 | WHT RED | Primary O2 Sensor | Input | | D15 | W7 | RED YEL | Intake Air Temperature Sensor | Input (bias pull-up 1.5K) | | D16 | W8 | \* | \* | \* | | D17 | W5 | WHiTe/YELlow | MAP Sensor | Input: 0.32V @ -13.9 PSI, 4.84V @ 10.94 PSI | | D18 | W6 | lightLTGRN/BLK | VREF | Output for TCM +5V | | D19 | W3 | YEL/WHT | VCC1 MAP sensor power supply | Output +5V | | D20 | W4 | YEL BLU | VCC2 TPS, EGVL sensor power supply | Output +5V | | D21 | W1 | GRN/WHT | SG1 MAP sensor GND | Ground | | D22 | W2 | GRN BLU | SG2 - Sensors Ground | ground | ![Wiring Diagram](Images/Honda_1.png) ![Wiring Diagram](Images/Honda_2.png) ![Wiring Diagram](Images/Honda_3.png) ## Components [Honda F22B1 Engine - Wikipedia]]() Fuel Injector 06164-P0A-A00 248cc/min Low impedance MAP sensor 37830-P05-A01 ECT sensor 37870-PJ7-003 ![ECT Sensor Coorelation](Images/Honda_ECT.png) IAT 37880-P0A-A02 DISTRIBUTOR ASSY D4T92-04 ignition control module 30120-P0A-A01 ## TCM pinout tcm 28100-P0H-A02 ## TCM 26 pin | | | | | | --- | ------------ | ------------------------ | ------ | | A1 | \* | \* | \* | | A2 | \* | \* | \* | | A3 | GRN/WHT | Shift solenoid control B | Output | | A4 | GRN/YEL | Lockup solenoid B | Output | | A5 | BLU/YEL | Shift solenoid control A | Output | | A6 | YELlow | Lockup solenoid A | Output | | A7 | \* | \* | \* | | A8 | | D4 light control | Output | | A9 | BLUe | Engine Speed from dizzy | Input | | A10 | \* | \* | \* | | A11 | | Selector "1" input | | | A12 | \* | \* | \* | | A13 | | Selector "2" input | | | A14 | \* | \* | \* | | A15 | | Selector "D3" input | | | A16 | \* | \* | \* | | A17 | Lt GRN/BLacK | Selector "D4" input | | | A18 | WHT/GRN | Shift lock control | | | A19 | Lt GRN | Park/Neutr input | | | A20 | WHT/YEL | Battery input | | | A21 | | Reverse input | Input | | A22 | | A/C on input | Input | | A23 | | Ignition input | | | A24 | | Ignition input | | | A25 | BRN/BLK | Ground | Ground | | A26 | BRN/BLK | Ground | Ground | ## TCM 22 pin | | | | | | --- | ---------- | -------------------------------- | -------- | | D1 | \* | \* | \* | | D2 | \* | Brake switch | Input | | D3 | | Baro Pressure | Input | | D4 | \* | \* | \* | | D5 | | Engine Coolant Temp sensor | Input | | D6 | | Service Check Conn | | | D7 | | Throttle Position Sensor | Input | | D8 | \* | \* | \* | | D9 | ORG | Vehicle Speed Sensor | Input | | D10 | \* | \* | \* | | D11 | GRN | Up/Down shift sig | | | D12 | | Mainshaft speed Sensor Ground | Ground | | D13 | WHT/RED | Up/Down shift sig | | | D14 | \* | \* | \* | | D15 | | Countershaft speed | Input | | D16 | BRN/WHiTe | Shift Ack | | | D17 | | Countershaft speed Sensor Ground | Ground | | D18 | LT GRN/BLK | Voltage Reference | Input +5 | | D19 | | Mainshaft speed | Input | | D20 | \* | \* | \* | | D21 | \* | \* | \* | | D22 | \* | \* | \* | ### diagram ![Wiring Diagram](Images/TCM.png) ![Wiring Diagram](Images/TCM_2.png) ## trigger signal Measured 845 ohms between pins B15 / B16 also same for B14 / B13 and same for B12 / 11. ![Scope Screenshot](Images/Distributor_timing_obd1.jpg) ## stock ECU schematics highlights IC1: main chip, OKI 66911, DIP Inputs: TDC input: HIC1#10, TTL signal: HIC1##8, goes to IC7#35 CYP input: HIC1#15, TTL signal: HIC1##12, goes to IC1#27 CKP input: HIC1#19, TTL signal: HIC1##17, goes to IC1#34 Outputs: Ignition module: IC7#28 via R28 & Q22 See also [Honda Prelude 1993](Honda-Prelude-1993)