Line Pressure Test

CAUTION: Perform the line pressure test prior to performing the stall speed test. If line pressure is low at stall, do not perform the stall speed test or further transmission damage will occur. Do not maintain wide-open throttle in any transmission range for more than 5 seconds or transmission damage may occur.

NOTE: Perform shift linkage check prior to performing this test.

This test verifies the line pressure is within specifications.
1. Connect the Pressure Gauge to the line pressure tap.

Line Pressure Chart:

2. Start the engine and check the line pressures. Refer to the Line Pressure Chart to determine if the line pressure is within specification.

Line Pressure Diagnosis Chart:

3. If the line pressure is not within specifications, perform On-Board Diagnostics and Pinpoint Test E, air pressure check, and clean, inspect and replace the main control system or pump as required.