Oil Pressure Check

1. Lift carpeting from transmission housing, then remove access plate.
2. Remove plug from front left side of transmission and connect suitable pressure gauge to transmission. Connect tachometer to engine and apply brakes
3. With gear selector in Neutral and engine operating at 1000 RPM, oil pressure should be 55-70 psi.
4. With gear selector in Drive and engine idling at normal idle, oil pressure should be 60-85 psi. Increase engine speed to 1000 RPM. Oil pressure should be 60-90 psi.
5. With gear selector in 2 or 1 range, operate engine at 1000 RPM. Oil pressure should be 135 to 160 psi.
6. With gear selector in R, operate engine at 1000 RPM. Oil pressure should be 95-150 psi.
7. With gear selector in drive, operate engine at 1000 RPM with downshift switch activated. Oil pressure should be 90-100 psi (6.3-7.7 kg/cm2).
8. Disconnect vacuum line from modulator and raise and support vehicle so drive wheels are free to turn. With gear selector in drive, and brakes released, operate engine at 1000 RPM and note pressure reading. Slowly increase engine speed to 3000 RPM and check for a pressure drop of 10 psi. If pressure drop is greater than 10 psi, valve body is not performing satisfactorily. If pressure drop is less than 10 psi, inspect governor and governor feed system for proper operation.
9. Reconnect vacuum line. With vehicle supported as described in step 8, place gear selector in Drive and operate engine at 3000 RPM. Release accelerator and note oil pressure reading as engine speed drops to 1200-2000 RPM. Oil pressure reading should be 55-70 psi (3.8-4.9 kg/cm2).
10. In the above steps where low line pressure readings are indicated, check for low fluid level, dirty filter, damaged pump, internal circuit leaks, or internal case leaks. Where high line pressure readings are indicated, check for vacuum leaks, damaged modulator, malfunctioning detent system, or control valve assembly or damaged pump.