Ford 2003 Mustang Workshop Manual page 654

E1 CHECK THE PUMP MOTOR FOR CONTINUOUS OPERATION
Check the pump motor for continuous operation.
Is the pump motor running continuously?
E2 CHECK CIRCUIT 534 (YE/LG) FOR AN OPEN
Key in OFF position.
Disconnect: Anti-Lock Brake Control Module C135.
Measure the voltage between anti-lock brake control module C135
Pin 13, Circuit 534 (YE/LG), harness side, and ground.
Is the voltage greater than 10 volts?
E3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
Measure the resistance between anti-lock brake control module
C135 Pin 12, Circuit 1205 (BK), harness side and ground.
Is the resistance less than 5 ohms?
E4 CHECK THE PUMP MOTOR FOR OPERATION
Disconnect: Pump Motor Connector.
Connect a 30A fused heavy jumper wire between the positive battery
post and pump motor connector Pin 1 (component side); and
momentarily connect a heavy jumper between negative battery post
and pump motor connector Pin 2 (component side).
Yes
INSTALL a new
anti-lock brake
control module;
REFER to Module .
REPEAT the self-
test.
No
GO to E2 .
Yes
GO to E3 .
No
REPAIR the circuit.
CLEAR the DTCs.
REPEAT the self-
test.
Yes
GO to E4 .
No
REPAIR the circuit.
CLEAR the DTCs.
REPEAT the self-
test.
Yes
INSTALL a new
anti-lock brake
control module;
REFER to Module .
REPEAT the self-
test.
No
INSTALL a new
HCU; REFER to
Hydraulic Control
Unit . CLEAR the
DTCs. REPEAT