Ford 2003 Mustang Workshop Manual page 2361

D2 SOLENOID FUNCTIONAL TEST
Install 2,060 kPa (300 psi) pressure gauge into EPC tap.
Monitor pressure gauge.
Enter the following diagnostic mode on the diagnostic tool:
Parameter; EPC.
Select value - 15, 30, 45, 60, 70 or 90 psi.
Press "SEND".
Select another value "0-90 psi".
Press "SEND".
Enter the following diagnostic mode on the diagnostic tool:
XXX.
Press "SEND".
Does the pressure reading match the commanded
pressure?
D3 CHECK FOR BATTERY VOLTAGE
Remove transmission fluid pan.
Visually inspect the lead frame connectors for damage.
Key in ON position.
Measure the voltage with positive lead to VPWR solenoid
pin and negative lead to a good ground.
Is voltage greater than 10 volts?
D4 ELECTRICAL SIGNAL CHECK
Measure the voltage with positive lead connected to
VPWR solenoid pin and connect negative lead to the
signal pin of the EPC solenoid.
Turn the solenoids ON and OFF, while monitoring the
voltage reading, solenoid state on the scan tool (ON and
OFF), listen for the solenoid to activate (click).
Enter the following diagnostic mode on the diagnostic tool:
Trans-Bench Mode.
Enter the following diagnostic mode on the diagnostic tool:
Parameter EPC.
Select a value "0-90 psi".
Press "SEND".
Select another value "0-90 psi".
Press "SEND".
Enter the following diagnostic mode on the diagnostic tool:
Yes
CLEAR DTCs. REPEAT OBD
Tests.
No
GO to D3 .
Yes
GO to D4 .
No
REPAIR the circuit. CLEAR
the DTCs. REPEAT the OBD
Tests.
Yes
GO to D5 .
No
CHECK for open or short
circuit in harness or PCM.