Line Pressure Test

CAUTION:

Perform Line Pressure Test prior to performing Stall Speed Test. If line pressure is low, do not perform 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 Electronic Pressure Control (EPC), FMEM (Failure Mode Effect Management) actions. Be sure that Self Test and electrical repairs have been performed, or test results may be incorrect.

This test verifies that the line pressure is within specifications.

Connect pressure gauge to the line pressure tap.

Fig 1: Locating Line Pressure Tap
Courtesy of MAZDA MOTORS CORP.
Start engine and check line pressures. See the following Pressure chart to determine if line pressure is within specifications.
- If line pressure is not within specifications, check EPC pressure.
Fig 2: Line Pressure Test Chart
Courtesy of MAZDA MOTORS CORP.
Connect Pressure Gauge to EPC pressure tap.

Fig 3: Locating EPC Pressure Tap
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Restart engine and check EPC pressure. See Reference pressure chart for specification.
- If EPC pressure is not within specification, see DTC P1746, P1747: ELECTRONIC PRESSURE CONTROL (EPC) SOLENOID 5R44E AND 5R55E ONLY to diagnose EPC.
- If EPC operation is OK, see line pressure diagnosis chart for line pressure concern causes.
Fig 4: Test Result & Possible Source Table
Courtesy of MAZDA MOTORS CORP.