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 MANUALSGMC1989S15/T15 2WD JIMMY V6-173 2.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTDIAGRAMSELECTRICAL DIAGRAMSELECTRONIC/POWERTRAIN CONTROL MODULE (ECM/PCM)
1989 GMC S15/T15 2WD Jimmy V6-173 2.8L
Electronic/Powertrain Control Module (ECM/PCM)
1989 GMC S15/T15 2WD Jimmy V6-173 2.8LSECTION Electronic/Powertrain Control Module (ECM/PCM)
ECM Wiring Diagram (Part 1 of 3):
A8 = SERIAL DATA.
A9 = DIAGNOSTIC TEST.
A12 = SYSTEM GROUND.
D1 = SYSTEM GROUND.
C9 = CRANK SIGNAL.
D7 = OXYGEN SENSOR SIGNAL.
D6 = OXYGEN SENSOR GROUND.
A11 = SENSOR GROUND.
C11 = MAP SIGNAL.
C14 = +5V REFERENCE.
C13 = TPS SIGNAL.
D2 = SENSOR GROUND.
C10 = COOLANT TEMPERATURE SENSOR.
B8 = A/C SIGNAL.
A2 = A/C RELAY CONTROL.
ECM Wiring Diagram (Part 2 of 3):
C5 = IAC "A" HI.
C6 = IAC "A" LO.
C4 = IAC "B" HI.
C3 = IAC "B" LO.
C12 = E-CELL.
A8 = IGNITION.
D16 = INJECTOR DRIVER.
D14 = INJECTOR DRIVER.
D4 = EST.
B5 = REFERENCE.
D5 = BYPASS.
B3 = REFERENCE LOW.
B1 = 12 VOLTS.
C16 = 12 VOLTS.
A1 = FUEL PUMP RELAY DRIVE (12).
B2 = FUEL PUMP SIGNAL.
ECM Wiring Diagram (Part 3 of 3):
A5 = SERVICE ENGINE SOON LIGHT CONTROL.
A7 = TCC CONTROL (A/T).
A7 = SHIFT LIGHT (M/T).
C2 = EAC SOLENOID.
A10 = VEHICLE SPEED SENSOR.
B10 = PARK NEUTRAL SWITCH (A/T)(12V).
B7 = KNOCK RETARD SIGNAL (ESC).
A6 = 12 VOLT SIGNAL.
A4 = EGR 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.