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 MANUALSCHEVROLET1993CAPRICE WAGON RWD V8-350 5.7LREPAIR AND DIAGNOSISDIAGRAMSELECTRICAL DIAGRAMSPOWERTRAIN MANAGEMENTSYSTEM DIAGRAMELECTRONIC/POWERTRAIN CONTROL MODULE (ECM/PCM)
1993 Chevrolet Caprice Wagon RWD V8-350 5.7L
Electronic/Powertrain Control Module (ECM/PCM)
1993 Chevrolet Caprice Wagon RWD V8-350 5.7LSECTION Electronic/Powertrain Control Module (ECM/PCM)
ECM Wiring Diagram (1 Of 5):
A8 = SERIAL DATA
A9 = DIAGNOSTIC TEST TERMINAL
A12 = ECM GROUND
D1 = ECM GROUND
D6 = OXYGEN SENSOR GROUND
D7 = OXYGEN SENSOR SIGNAL
C12 = IAT SENSOR SIGNAL
C10 = COOLANT TEMPERATURE SIGNAL
A11 = CTS, TPS & IAT SENSOR GROUND
C13 = TPS SIGNAL
C14 = +5V REFERENCE
C11 = MAP SENSOR SIGNAL
D2 = MAP SENSOR GROUND
C9 = CRANK SIGNAL
C5 = IAC COIL "A" HIGH
C6 = IAC COIL "A" LOW
C4 = IAC COIL "B" HIGH
C3 = IAC COIL "B" LOW
ECM Wiring Diagram:
B10 = PARK/NEUTRAL SWITCH SIGNAL
A5 = "SERVICE ENGINE SOON" LIGHT CONTROL
C7 = 4TH GEAR SWITCH SIGNAL
A7 = TCC CONTROL
D16 = INJECTOR DRIVER 1
D14 = INJECTOR DRIVER 2
D4 = EST
B5 = REFERENCE
D5 = BYPASS
B3 = DISTRIBUTOR REFERENCE LOW
ECM Wiring Diagram:
C16 = BATTERY +
B1 = BATTERY +
A1 = FUEL PUMP RELAY DRIVE
A12 = ECM GROUND
B2 = FUEL PUMP SIGNAL (VOLTAGE MONITOR)
C8 = A/C REQUEST
C2 = A/C CLUTCH RELAY
ECM Wiring Diagram:
A3 = CANISTER PURGE SOLENOID CONTROL
A10 = VSS SIGNAL
B7 = SPARK RETARD SIGNAL (ESC)
A6 = IGNITION FEED
C1 = ELECTRIC DIVERTER VALVE (EDV) SOLENOID CONTROL
A4 = EGR SOLENOID CONTROL
C8 = POWER STEERING PRESSURE SWITCH INPUT
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.