EPC Pressure Check
- Connect a 0-100 psi (0-7.0 kg/cm2 ) pressure gauge to EPC pressure tap at right side of transmission case. See Figure . Gauge hose must be long enough to read gauge while operating engine.
- With engine at normal operating temperature, apply parking and service brakes. Check EPC pressure at idle and WOT stall in all ranges. See CONTROL PRESSURE SPECIFICATIONS . If pressure is not as specified, go to PINPOINT TEST E in AUTO TRANS DIAGNOSIS - FORD 4R70W CONTROLS article, to diagnose EPC operation. If EPC operation is okay, go to LINE PRESSURE TEST RESULTS .
NOTE:
Pressure test at idle position must be taken with engine at normal operating temperature. Pressure test at WOT position should be taken at full stall conditions. Run engine at a fast idle in "N" for 15 seconds to cool fluid between tests.