Ford 2003 Mustang Workshop Manual page 3542

Is the voltage zero volts for any measurement?
G10 CHECK CIRCUIT 914 (TN/OG) AND CIRCUIT 915
(PK/LB) FOR THE SOURCE OF THE CONCERN —
INSTRUMENT CLUSTER C220a DISCONNECTED
Key in OFF position.
Disconnect: Instrument Cluster C220a.
Key in ON position.
Measure the voltage between DLC C251 Pin 2, Circuit
914 (TN/OG), harness side and C251 Pin 4, Circuit
1205 (BK); and between DLC C251 Pin 2, Circuit 914
(TN/OG), harness side and C251 Pin 16, Circuit 1047
(LG/RD), harness side.
Measure the voltage between DLC C251 Pin 10,
Circuit 915 (PK/LB), harness side and C251 Pin 4,
Circuit 1205 (BK); and between DLC C251 Pin 10,
Circuit 915 (PK/LB), harness side and C251 Pin 16,
Circuit 1047 (LG/RD), harness side.
Is the voltage zero volts for any measurement?
PINPOINT TEST H: NO MODULE / NETWORK COMMUNICATION —
NO POWER TO THE DIAGNOSTIC TOOL
Test Step
Yes
REPAIR the circuit(s) in question
between in-line C215, DLC
C251, and the instrument cluster
C220a. For additional
information, REFER to
Communication Circuit Wiring
Repair . TEST the system for
normal operation.
No
INSTALL a new instrument
cluster. For additional
information, REFER to
413-01 . TEST the system for
normal operation.
Result / Action to
Take
Section