Need 1994 civic wiring diagram for p28 ECU?

Answer 1

This here is a list of the wires for the main wiring harness using a P28 OBD1 CIVIC ecu. This is the harness that lies inside of the cabin against the firewall, not the engine harness that connects to the main harness at the strut towers. The plug "A" is the largest of the three, "B" is the smallest, aslo in the center, and the "D" plug is the middle sized plug.

A1 BRN INJ1 INJ1

A2 YEL INJ4 INJ4

A3 RED INJ2 INJ2

A4 ORN/WHT VTS VTEC solenoid

A5 LT BLU INJ3 INJ3

A6 ORN/BLK PO2SHTC O2 sensor (heating element)

A7 GRN/YEL FLR1 fuel pump

A8 (empty)

A9 GRN/WHT IACV IAC valve

A10 (empty)

A11 (empty)

A12 YEL/GRN FANC Fan Output

A13 GRN/ORN MIL MIL (check engine light)

A14 (empty)

A15 BLK/RED ACC (a/c compressor clutch)

A16 WHT/YEL ALT C alternator

A17

A18 (empty)

A19 (a/t trans only)

A20 RED PCS EVAP purge control solenoid

A21 RED/GRN ICM ICM

A22 (empty)

A23 BLK PG1 ground

A24 BLK PG2 ground

A25 YEL/BLK IGP2 to main relay and to gound for o

A26 BRN/BLK LG1 gound

B1 YEL/BLK IGP2 to pin A25

B2 BRN/BLK LG2 ground to shields for CYP & TDC

B3 (a/t trans only)

B4 (a/t trans only)

B5 BLU/RED ACS a/c switch

B6 (empty)

B7 (a/t trans only)

B8 BRN/RED PSPSW PSP switch

B9 BLU/WHT clutch interlock switch

B10 YEL/BLU VSS vehicle speed sensor

B11 ORN CYP P CYP -P

B12 WHT CYP M CYP -M

B13 ORN/BLU TDC P TDC -P

B14 WHT/BLU TDC M TDC -M

B15 BLU/GRN CKP P CKP -P

B16 BLU/YEL CKP M CKP -M

D1 WHT/BLU VBU Back Up Power

D2 GRN/WHT BKSW brake switch

D3 KS Knock Sensor

D4 BRN SCS service check connector

D5 (empty)

D6 ORN/BLU VTM VTEC pressure switch

D7 LT BLU TXD/RXD (data link connector)

D8 (empty)

D9 PNK ALT F alternator

D10 GRN/RED ELD electric load detector

D11 RED/BLU TPS TPS Signal

D12 YEL/GRN

D13 RED/WHT ECT ECT sensor

D14 WHT PHO2S O2 sensor

D15 RED/YEL IAT IAT sensor

D16 WHT/YEL VREF VREF

D17 WHT MAP Map Signal

D18 (a/t trans only)

D19 YEL/GRN VCC1 MAP 5V

D20 YEL/WHT VCC2 TPS 5V

D21 GRN/BLU SG1 MAP GND

D22 GRN/WHT SG2 TPS GND