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 MANUALSCHEVROLET1994K 2500 SUBURBAN 4WD V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSSHIFT LIGHTTESTING AND INSPECTION
1994 Chevrolet K 2500 Suburban 4WD V8-350 5.7L
Shift Light: Testing and Inspection
1994 Chevrolet K 2500 Suburban 4WD V8-350 5.7LSECTION Testing and Inspection
Manual Transmission Shift Light Chart:
Manual Transmission Shift Light Circuit:
Circuit Description:
The control module uses information from the following inputs to control the shift light:
^ Engine Coolant Temperature (ECT) sensor.
^ Throttle Position (TP) sensor.
^ Vehicle Speed Sensor (VSS).
^ RPM.
The control module uses the measured RPM and the vehicle speed to calculate what gear the vehicle is in. It's this calculation that determines when the shift light should be turned "ON"
Chart Test Description: Number(s) below refer to circled number(s) on the diagnostic chart.
1. This should not turn "ON" the shift light. If the light is "ON," there is a short to ground in CKT 456 wiring, or a fault in the control module.
2. This should turn "ON" the shift light.
3. This checks for an open in the shift light circuit, or a faulty control module.
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.