Line Pressure Check

Line Pressure Check





Tools Required

J 21867 Pressure Gage

Warning

Keep the brakes applied at all times in order to prevent unexpected vehicle motion. Personal injury may result if the vehicle moves unexpectedly.

1. Install a scan tool.
2. Start the engine.
3. Inspect the transmission for the proper fluid level. Refer to Transmission Fluid Check (Transmission Fluid Check).
4. Use the scan tool to inspect for any active or stored diagnostic trouble codes.
5. Inspect the manual linkage at the transmission for proper function.
6. Turn the engine OFF.

Note: You may need to remove or disconnect components in order to gain access to the transmission line pressure test hole plug.

7. Remove the line pressure test hole plug.
8. Install the J 21867 .
9. Access the Scan Tool Transmission Output Controls for the Line PC Solenoid.
10. Start the engine.

Note: In order to achieve accurate line pressure readings, the following procedure should be performed at least three times.

The scan tool commands line pressures in increments of approximately 200 Kpa (30 psi). However, these pressure values are not displayed on the scan tool screen.

Control the Line PC Solenoid in PARK or NEUTRAL with the engine speed at approximately 1500 RPM and the TFT between 35-55°C (95-131°F). This protects the clutches from extreme high or low line pressures and ensures a consistent pump capacity.

11. Use the scan tool to increase and decrease line pressure, allowing the pressure to stabilize between increments.
12. Compare the pressure readings on the gage with the table below.
13. If the pressure readings on the gage are erratic, or increment by more than approximately 200-300 Kpa (30-40 psi), refer to Fluid Pressure High or Low (Fluid Pressure High or Low).
14. Turn the engine OFF.
15. Remove the J 21867 .

Caution: Refer to Fastener Caution (Fastener Caution).

16. Install the line pressure test hole plug. Tighten the pressure plug to 11 Nm (97 lb in).