Line Pressure/EPC Pressure Test

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

This test verifies that the line pressure is within specification.






1. Connect a 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.
3. If the line pressure is not within specification, check EPC pressure.
4. Connect a pressure gauge to the Electronic Pressure Control (EPC) pressure tap.
5. Start the engine and check the EPC pressure.
6. If the EPC pressure is not within specification, perform Pinpoint Test E to diagnose the EPC operation.

Line Pressure Diagnosis Chart:

7. If EPC operation is OK, refer to the Line Pressure Diagnosis Chart for line pressure concern causes.