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 MANUALSCHEVROLET1992S10/T10 P/U 4WD V6-173 2.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOUTPUT DRIVERDESCRIPTION AND OPERATION
1992 Chevrolet S10/T10 P/U 4WD V6-173 2.8L
Output Driver: Description and Operation
1992 Chevrolet S10/T10 P/U 4WD V6-173 2.8LSECTION Description and Operation
Quad/Output Driver Module
The Control Module in this vehicle controls most components with electronic switches which complete a ground circuit when turned on.
When the switches are arranged in groups of 4, they can independently control up to 4 outputs and are called Quad Drivers.
When the switches are arranged in groups of 7, they can independently control up to 7 outputs and are called Output Drivers.
Not all outputs are always used.
Shorted solenoid. relay coil. or harness- Solenoids and relays are turned "ON" and "OFF" by the PCM or VCM using internal electronic switches called "drivers." Each driver is part of a group of four called "quad-drivers." Failure of one driver can damage any other driver in the set.
A shorted solenoid, relay coil. or harness will not damage the "quad-drivers" in this VCM/PCM, but will cause the circuit and controlled component to be inoperative. When the circuit fault is not present or has been repaired, the "quad-driver" will again operate in a normal manner due to its fault protected design. If a fault has been repaired in a circuit, controlled by a "quad-driver," the original VCM/PCM should be reinstalled and the circuit checked for proper operation. PCM replacement will not be necessary if the repaired circuit or component operates correctly.
The J 39200 DVM testers, or equivalent, provide a fast, accurate means of checking for a shorted coil, or a short to battery voltage.
The replacement VCM/PCM may be faulty - After the VCM/PCM is replaced, the system should be rechecked for proper operation. If the diagnostic chart again indicates that the VCM/PCM is the problem, substitute a known good VCM/PCM.
The Control Module in this vehicle controls most components with electronic switches which complete a ground circuit when turned on.
When the switches are arranged in groups of 4, they can independently control up to 4 outputs and are called Quad Drivers.
When the switches are arranged in groups of 7, they can independently control up to 7 outputs and are called Output Drivers.
Not all outputs are always used.
Shorted solenoid. relay coil. or harness- Solenoids and relays are turned "ON" and "OFF" by the PCM or VCM using internal electronic switches called "drivers." Each driver is part of a group of four called "quad-drivers." Failure of one driver can damage any other driver in the set.
A shorted solenoid, relay coil. or harness will not damage the "quad-drivers" in this VCM/PCM, but will cause the circuit and controlled component to be inoperative. When the circuit fault is not present or has been repaired, the "quad-driver" will again operate in a normal manner due to its fault protected design. If a fault has been repaired in a circuit, controlled by a "quad-driver," the original VCM/PCM should be reinstalled and the circuit checked for proper operation. PCM replacement will not be necessary if the repaired circuit or component operates correctly.
The J 39200 DVM testers, or equivalent, provide a fast, accurate means of checking for a shorted coil, or a short to battery voltage.
The replacement VCM/PCM may be faulty - After the VCM/PCM is replaced, the system should be rechecked for proper operation. If the diagnostic chart again indicates that the VCM/PCM is the problem, substitute a known good VCM/PCM.
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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.