Ford 2003 Mustang Workshop Manual page 3019

Is the resistance less than 5 ohms?
A16 CHECK CIRCUIT 239 (WH/OG) FOR AN OPEN
Disconnect: PCM C175.
Connect EEC-V 104-Pin Breakout Box.
Measure the resistance between speed control servo C122 pin
3, circuit 239 (WH/OG), harness side and Breakout Box, EEC-V
Control System pin 68, circuit 239 (WH/OG), harness side.
Is the resistance less than 5 ohms?
A17 CHECK THE SPEED CONTROL SERVO
INSTALL a known good speed control servo.
Test drive the vehicle for correct operation.
Does the speed control operate correctly?
PINPOINT TEST B: THE SET SPEED FLUCTUATES
Test Step
B1 CHECK THAT CONDITION OCCURS
ONLY WHILE USING SPEED CONTROL
Check that the condition does not occur
when driving without speed control.
Does the condition occur without
speed control?
Yes
GO to
No
REPAIR the circuit.
TEST the system for
normal operation.
Yes
INSTALL a new speed
control servo; REFER to
Actuator—Speed
Control Servo
the system for normal
operation.
No
INSTALL a new PCM;
REFER to
14
for normal operation.
Result / Action to Take
Yes
REPAIR engine as necessary. TEST the
system for normal operation.
No
GO to B2 .
A17 .
. TEST
Section 303-
. TEST the system