Ford 2003 Mustang Workshop Manual page 2040

PINPOINT TEST B: THE ENGINE DOES NOT CRANK AND THE
RELAY DOES NOT CLICK
B1 CHECK CIRCUIT 33 (WH/PK) FOR VOLTAGE
Disconnect: Starter Motor Relay.
Key in START position.
Measure the voltage between the starter motor relay pin 85,
circuit 33 (WH/PK) and ground while holding the key in the
START position.
Is the voltage greater than 10 volts?
B2 CHECK CIRCUIT 32 (RD/LB) FOR VOLTAGE AT THE DIGITAL
TR SENSOR
Key in OFF position.
Disconnect: Digital TR Sensor C110.
Key in START position.
Measure the voltage between the digital TR sensor C110 pin
10, circuit 32 (RD/LB) and ground while holding the key in the
START position.
Is the voltage greater than 10 volts?
B3 CHECK CIRCUIT 33 (WH/PK) FOR OPEN
Key in OFF position.
Measure the resistance between the digital TR sensor C110 pin
Test Step Result / Action to Take
Yes
GO to B10 .
No
For automatic
transmissions, GO to
B2 . For manual
transmissions, GO to
B5 .
Yes
GO to B3 .
No
GO to B7 .
Yes
GO to B4 .
No
REPAIR circuit 33
(WH/PK). TEST the
system for normal
operation.