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 MANUALSCHEVROLET1993FORWARD CONTROL 7.4 NREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - V6SELF-DIAGNOSTIC TESTSCODE 16, TRANSMISSION OUTPUT SPEED 4.3L "S" & "T" SERIES UTILITY VEHICLES WITH M/T & 4.3L WITH 4L60E TRANSMISSIONNOTES
1993 Chevrolet Forward Control 7.4 N
Code 16, Transmission Output Speed 4.3L "S" & "T" Series Utility Vehicles With M/T & 4.3L With 4L60E Transmission: Notes
1993 Chevrolet Forward Control 7.4 NSECTION Notes
VSS signal buffer supplies 2002 pulses per mile to PCM on vehicle speed signal circuit. Code 16 will set if this signal is lost due to an open or grounded signal line.
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- This tests for battery voltage at VSS buffer.
- This tests for proper ground path for VSS buffer.
- This tests for VSS buffer signal to PCM.
- This test checks for faulty connections and a faulty VSS buffer.
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.