Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1992SUBURBAN 3/4 TON 2WD V8-454 7.4LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDIAGRAMSWITH 4L80E AUTOMATIC TRANSMISSION
1992 Chevrolet Suburban 3/4 Ton 2WD V8-454 7.4L
With 4L80E Automatic Transmission
1992 Chevrolet Suburban 3/4 Ton 2WD V8-454 7.4LSECTION With 4L80E Automatic Transmission
ECM Connector Terminal End View (Part 1 Of 2):
A1 = FUEL PUMP RELAY DRIVE.
A2 = SHIFT SOLENOID "B" CONTROL.
A3 = SHIFT SOLENOID "A" CONTROL.
A4 = TCC SOLENOID CONTROL.
A6 = EAC CONTROL (7.4L under 8500 GVW).
A7 = SERVICE ENGINE SOON LIGHT CONTROL.
A11 = EVRV (EGR) CONTROL.
A12 = BRAKE SIGNAL.
B2 = RANGE "C" SIGNAL.
B3 = RANGE "B" SIGNAL.
B4 = RANGE "A" SIGNAL.
B5 = TRANSMISSION OUTPUT SPEED SIGNAL (4WD).
B6 = TRANSMISSION OUTPUT SPEED SENSOR GROUND.
B7 = FORCE MOTOR LOW.
B8 = FORCE MOTOR HIGH.
B9 = TRANSMISSION INPUT SPEED SIGNAL.
B10 = TRANSMISSION INPUT SPEED SENSOR GROUND.
B11 = VEHICLE SPEED AND TRANS OUTPUT SPEED SIGNAL (2WD).
B12 = A/C SIGNAL.
ECM Connector Terminal End View (Part 2 Of 2):
C1 = FUSED IGNITION FEED.
C2 = SYSTEM GROUND.
C3 = SYSTEM GROUND.
C4 = TPS REFERENCE VOLTAGE.
C5 = TPS SIGNAL.
C6 = IAC COIL "A" HIGH.
C7 = IAC COIL "A" LOW.
C8 = IAC COIL "B" LOW.
C9 = IAC COIL "B" HIGH.
C10 = MAP SENSOR SIGNAL.
C11 = SERIAL DATA.
C13 = OXYGEN SENSOR GROUND.
C14 = OXYGEN SENSOR SIGNAL.
C15 = INJECTOR #2 CONTROL.
C16 = INJECTOR #1 CONTROL.
D1 = BATTERY VOLTAGE FEED.
D2 = MAP/TTS SENSOR GROUND.
D3 = TPS/CTS SENSOR GROUND
D4 = MAP REFERENCE VOLTAGE.
D5 = ESC (KNOCK) SIGNAL.
D6 = DIAGNOSTIC TEST TERMINAL.
D7 = FUEL PUMP SIGNAL.
D11 = EST CONTROL.
D12 = EST BYPASS.
D13 = EST REFERENCE LOW.
D14 = EST REFERENCE HIGH.
D15 = TRANSMISSION TEMP SIGNAL.
D16 = COOLANT TEMP SIGNAL.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.