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 MANUALSCHEVROLET1997ASTRO VAN 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTRANSMISSION POSITION SENSOR/SWITCHTESTING AND INSPECTION
1997 Chevrolet Astro Van 2WD V6-4.3L VIN W
Transmission Position Sensor/Switch: Testing and Inspection
1997 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION Testing and Inspection
Diagnostic Chart:
Diagnostic Chart:
Diagnostic Chart:
Test Description
Tools Required
^ J 39775 4L60-E Jumper Harness
^ J 39200 Digital Multimeter
^ J 35616 Connector Test Adapter kit
Important: Whenever the transmission 20-way connector is disconnected and the engine is running, multiple DTCs will set. Be sure to clear these codes when you are finished with this procedure
Important: This procedure tests the Automatic Transmission Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) circuits and the Automatic Transmission Fluid Temperature (TFT) Sensor circuit. Do not use this procedure to test other Automatic Transmission circuits, refer to 4L60-E Automatic Transmission Internal Wiring Harness check. Testing and Inspection
RENDER: 1.0x
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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.