Electronic/Powertrain Control Module (ECM/PCM)

Engine Control (ECM):

GF16 = MAT SIGNAL
BB5 = MAT, MAP GROUND
GF15 = MAP SIGNAL
BA4 = +5 VOLT REFERENCE
BA5 = +5 VOLT REFERENCE
GF13 = TPS SIGNAL
B6 = TPS, CTS, A/C PRESS GROUND
GE16 = CTS SIGNAL
GE14 = OXYGEN SENSOR SIGNAL
GE15 = OXYGEN SENSOR GROUND
GF7 = COOLANT TEMP LIGHT CONTROL
BB1 = BATTERY
BC16 = BATTERY
BD13 = P/S PRESSURE SIGNAL (PSPS)
BD16 = P/N SWITCH
BA12 = GROUND
BD1 = GROUND
BA11 = FUEL PUMP CONTROL
BC12 = INJECTOR DRIVER 1,4
BC10 = INJECTOR DRIVER 2,3
BD5 = PEAK AND HOLD
BD6 = ENABLE JUMPER 1 AND 4
BC13 = PEAK AND HOLD
BC15 = PEAK AND HOLD ENABLE JUMPER 2,3

Engine Control (ECM):

GE5 = IAC COIL "B" HI
GE6 = IAC COIL "B" LO
GE3 = IAC COIL "A" HI
GE4 = IAC COIL "A" LO
GF1 = CCP DRIVER
BA6 = IGNITION
BA5 = + 5 VOLT REFERENCE
GF14 = A/C PRESSURE SIGNAL
BB6 = TPS, CTS, A/C PRESSURE GROUND
GF2 = A/C CLUTCH ENABLE
BC9 = A/C REQUEST
BC3 = NON-A/C PROGRAM (FOR NON-A/C CARS)
GE8 = FAN DRIVER
GE7 = SERVICE ENGINE SOON
GE12 = ALDL DIAGNOSTIC ENABLE
BA8 = SERIAL DATA

ECM Wiring Diagram:

***UPDATED BY TSB 90-6E-6 DATED JANUARY 1990





BB10 = VSS HI
BB9 = VSS LO
BB11 = 4000 P/MI SPEEDO/ODO
BD9 = IGNITION LO REFERENCE
BD8 = 2X
BC5 = 1X
BC8 = EST
BC7 = BYPASS
GF9 = KNOCK SIGNAL
BD15 = 3RD GEAR SWITCH (AUTO)
BD4 = 2ND GEAR SWITCH (AUTO)
GF4 = TORQUE CONVERTER (AUTO) UPSHIFT LIGHT (MAN.)
BC4 = BRAKE SIGNAL