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 MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLEDESCRIPTION AND OPERATIONFLUID POWER FLOW DESCRIPTIONPARK - ENGINE RUNNING
1990 Chevrolet Lumina APV V6-191 3.1L
Park - Engine Running
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Park - Engine Running
In this range, the torque converter is filled and all clutches and the band are released. The transaxle is in Park, and line pressure is regulated to approximately 70 psi.
With selector lever in Park position, oil from the pump is directed to the following:
1. Pressure regulator valve.
2. Converter and lubrication system.
3. Pump slide.
4. Manual valve.
5. Pressure relief valve.
6. Line pressure tap.
Oil flows from the pump to the pressure regulator valve which regulates pump pressure. When pump output exceeds the demand of line pressure, oil from the pressure regulator valve is directed to the converter feed passage to fill the converter. Converter return oil flows to transaxle cooler, and oil from the cooler goes to the transaxle lubrication system.
Oil is also directed from the pressure regulator valve to the pump slide to decrease pump output to the pressure of the regulator valve spring force, or 70 psi. Line pressure acts on the pressure relief valve which will relieve any pressure above 300-450 psi.
Line pressure at the manual valve is available for use in other drive ranges.
With selector lever in Park position, oil from the pump is directed to the following:
1. Pressure regulator valve.
2. Converter and lubrication system.
3. Pump slide.
4. Manual valve.
5. Pressure relief valve.
6. Line pressure tap.
Oil flows from the pump to the pressure regulator valve which regulates pump pressure. When pump output exceeds the demand of line pressure, oil from the pressure regulator valve is directed to the converter feed passage to fill the converter. Converter return oil flows to transaxle cooler, and oil from the cooler goes to the transaxle lubrication system.
Oil is also directed from the pressure regulator valve to the pump slide to decrease pump output to the pressure of the regulator valve spring force, or 70 psi. Line pressure acts on the pressure relief valve which will relieve any pressure above 300-450 psi.
Line pressure at the manual valve is available for use in other drive ranges.
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.