Line Pressure Tests

Line Pressure Test

Caution:
^ Carry out line pressure test prior to carrying out stall speed test. If line pressure is low at stall, do not carry out stall speed test or further transmission damage will occur. Do not maintain wide open throttle in any gear range for more than five seconds.

Note:
^ Certain sensor failures may cause high EPC, failure mode effect management (FMEM) actions. Be sure that self-test and electrical repairs have been carded out, or test results may be incorrect.

This test verifies line pressure is within specifications.





1. Connect pressure gauge to the line pressure tap on the transmission and a tachometer to the engine.
2. Start the engine, increase and maintain 1,000 engine rpm and check line pressures. See the line pressure chart to determine if line pressure is within specifications.

Line Pressure Chart:

3. If line pressure is not within specifications, check EPC pressure.





4. Connect Pressure Gauge to EPC pressure tap.
5. Start the engine, increase and maintain 1,000 engine rpm and check EPC pressure. See the line pressure chart for specification.
6. If EPC pressure is not within specification, see ELECTRONIC PRESSURE CONTROL (EPC) SOLENOID 5R44E AND 5R55E ONLY to diagnose EPC operation. P1746
If EPC operation is OK, see the line pressure diagnosis chart for line pressure concern causes.

Line Pressure Diagnosis Chart: