Electronic/Engine Control Module (ECM)

ECM Wiring Diagram Except 4L80-E Transmission (Part 1 Of 4):

A8 = SERIAL DATA.
A9 = DIAGNOSTIC TEST.
A12 = SYSTEM GROUND.
D6 = OXYGEN SENSOR GROUND.
D1 = SYSTEM GROUND.
C9 = CRANK SIGNAL.
D7 = OXYGEN SENSOR SIGNAL.
A11 = MAP GROUND.
C11 = MAP SIGNAL.
C14 = +5V REFERENCE.
C13 = TPS SIGNAL.
D2 = SENSOR GROUND.
C10 = CTS SIGNAL.
C5 = IAC COIL "A" HI.
C6 = IAC COIL "A" LO.
C4 = IAC COIL "B" HI.
C3 = IAC COIL "B" LO.

ECM Wiring Diagram Except 4L80-E Transmission (Part 2 Of 4):

B8 = A/C SIGNAL.
B1 = 12 VOLT.
C16 = 12 VOLT.
A1 = FUEL PUMP RELAY DRIVE (12V).
B2 = FUEL PUMP SIGNAL.
A5 = SERVICE ENGINE SOON LIGHT CONTROL.
C7 = HIGH GEAR SWITCH SIGNAL.
A7 = A/T TCC CONTROL (GROUND).
A7 = M/T SHIFT LAMP (GROUND).

ECM Wiring Diagram Except 4L80-E Transmission (Part 3 Of 4):

A10 = VEHICLE SPEED SENSOR SIGNAL.
B10 = PARK NEUTRAL SWITCH.
A4 = EGR SOLENOID.
A4 = EVRV SOLENOID.
A6 = 12 VOLT IGNITION.
B7 = KNOCK RETARD SIGNAL (ESC).

ECM Wiring Diagram Except 4L80-E Transmission (Part 4 Of 4):

D16 = INJECTOR DRIVER.
D14 = INJECTOR DRIVER.
D4 = EST.
B5 = REFERENCE.
D5 = BYPASS.
B3 = REF. LOW.