Oil Pressure Check

WARNING:Brakes must be applied at all times during this test to prevent any unexpected vehicle motion. Total test running time should not exceed two minutes, or transmission damage could occur.


1. Connect Tech 1 scan tool or equivalent to vehicle ALDL connector.




2. Connect suitable oil pressure gauge to line pressure tap.

3. Start engine and ensure transmission is at normal operating temperature and fluid level is full.

4. Check for trouble codes and repair if necessary.

5. With gear selector in Park, access "Override Force Motor" test on the scan tool, then increase force motor current in 0.1 amp increments (allowing five seconds for pressure to stabilize) and note pressure reading. Compare results with pressure chart. Line pressure will pulse either high or low every 10 seconds to keep force motor plunger free. This is normal and will not harm transmission.

6. If pressure readings differ greatly from pressure chart or if pressure is not within 35 - 177 psi in drive, park or neutral ranges and 67 - 324 psi in reverse range, refer to "Troubleshooting."