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.
1992 GMC Suburban 1/2 Ton 2WD V8-350 5.7LFACTORY OEM SERVICE PROCEDURE
Without 4L60E/4L80E Automatic Transmission
ECM Wiring Diagram (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 SENSOR GROUND.
C11 = MAP SIGNAL.
C14 = +5 VOLT REFERENCE.
C13 = TPS SIGNAL.
D2 = SENSOR GROUND.
C10 = CTS SIGNAL.
C5 = IAC COIL "A" HIGH.
C6 = IAC COIL "A" LOW.
C4 = IAC COIL "B" HIGH.
C3 = IAC COIL "B" LOW.
ECM Wiring Diagram (Part 2 Of 4):
B8 = A/C REQUEST SIGNAL.
B1 = IGNITION FEED.
C16 = IGNITION FEED.
A1 = FUEL PUMP RELAY DRIVE.
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 (Part 3 Of 4):
A10 = VSS SIGNAL.
B10 = PARK/NEUTRAL SWITCH.
A4 = EGR SOLENOID.
A4 = EVRV SOLENOID.
C2 = EAC SOLENOID.
A6 = IGNITION FEED.
B7 = KNOCK RETARD SIGNAL(ESC).
ECM Wiring Diagram (Part 4 Of 4):
D16 = INJECTOR DRIVER.
D14 = INJECTOR DRIVER.
D4 = EST.
B5 = REFERENCE HIGH.
D5 = BYPASS.
B3 = REFERENCE LOW.
Factory Service Tools
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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.
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