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 MANUALSPONTIAC1989GRAND PRIX V6-191 3.1LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTDIAGRAMSELECTRICAL DIAGRAMSELECTRONIC/POWERTRAIN CONTROL MODULE (ECM/PCM)NON-TURBOCHARGED MODEL
1989 Pontiac Grand Prix V6-191 3.1L
Non-Turbocharged Model
1989 Pontiac Grand Prix V6-191 3.1LSECTION Non-Turbocharged Model
ECM Wiring Diagram, Part 1 Of 3:
B3 = DIAGNOSTIC TEST
B5 = SERIAL DATA INPUT
B7 = A/T TCC CONTROL
C20 = 2ND GEAR SIGNAL
D6 = 3RD GEAR SIGNAL
D22 = 4TH GEAR SIGNAL
D11 = PARK NEUTRAL SWITCH (A/T)
C2 = VSS INPUT
B1 = SERVICE ENGINE SOON LIGHT
A13 = COOLANT LIGHT CONTROL
B7 = SHIFT LIGHT CONTROL (MT)
B8 = BUFFERED SPEED OUTPUT
A18 = AIR DIVERT CONTROL
A10 = CANISTER PURGE CONTROL
A4 = EGR CONTROL
C12 = 5 VOLT REFERENCE
C18 = EGR VALVE POSITION SIGNAL
C5 = SENSOR GROUND
C22 = MAP SIGNAL
C7 = 5 VOLT REFERENCE
C14 = COOLANT LEVEL SENSOR SIGNAL
C16 = COOLANT TEMPERATURE SIGNAL
ECM Wiring Diagram, Part 2 Of 3:
C3 = BYPASS
C9 = EST
D13 = REFERENCE
D19 = GROUND
D9 = INJECTOR DRIVER 2,4,6
D3 = INJECTOR DRIVER 1,3,5
C4 = MAT SIGNAL
C10 = SENSOR GROUND
C5 = SENSOR GROUND
C15 = TPS SIGNAL
C12 = +5 VOLT REFERENCE
D17 = BATTERY FEED
C1 = BATTERY FEED
D7 = FUEL PUMP RELAY DRIVE (12V)
A20 = FUEL PUMP SIGNAL
ECM Wiring Diagram, Part 3 Of 3:
A1 = IAC COIL "A" HI
A7 = IAC COIL "A" LO
A8 = IAC COIL "B" HI
A2 = IAC COIL "B" LO
D4 = ECM AND INJECTOR DRIVER GROUND
C6 = ECM AND INJECTOR DRIVER GROUND
D10 = ECM AND INJECTOR DRIVER GROUND
D12 = ECM AND INJECTOR DRIVER GROUND
A22 = OXYGEN SENSOR GROUND
A16 = OXYGEN SENSOR SIGNAL
B10 = ISOLATED IGNITION FEED
D16 = POWER STEERING SIGNAL
A11 = ESC SIGNAL
A9 = FAN #1 CONTROL
A3 = FAN #2 CONTROL
D21 = FAN #1 REQUEST
B20 = FAN #2 REQUEST
C17 = A/C REQUEST
B12 = A/C LOW PRESSURE SIGNAL
A12 = A/C RELAY CONTROL
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.