Ford 2003 Mustang Workshop Manual page 3533

Disconnect the diagnostic tool.
Measure the resistance between instrument cluster
C220a Pin 2, Circuit 915 (PK/LB), harness side and
DLC C251 Pin 10, Circuit 915 (PK/LB), harness side.
Is the resistance less than 5 ohms?
PINPOINT TEST E: THE MODULE DOES NOT RESPOND TO THE
DIAGNOSTIC TOOL — POWERTRAIN CONTROL MODULE (PCM)
E1 CHECK PCM C175 FOR DAMAGE
Key in OFF position.
Disconnect: PCM C175.
Inspect PCM C175 for damage; repair as necessary.
Connect: PCM C175.
Connect the diagnostic tool.
Key in ON position.
Enter the following diagnostic mode on the diagnostic
tool: Diagnostic Data Link.
Was the result received PCM: NO RESPONSE ON
CKT914 (BUS+)?
E2 CHECK FOR OPEN BETWEEN DLC C251 PIN 2 AND
PCM C175 PIN 16 — CIRCUIT 914 (TN/OG)
Key in OFF position.
Disconnect the diagnostic tool.
Disconnect: PCM C175.
Measure the resistance between PCM C175 Pin 16,
Circuit 914 (TN/OG), harness side and DLC C251 Pin
2, Circuit 914 (TN/OG), harness side.
Is the resistance less than 5 ohms?
E3 CHECK CIRCUIT 914 (TN/OG) BETWEEN DLC C251
AND IN-LINE C215 FOR OPEN
Disconnect: In-Line C215.
Test Step
INSTALL a new instrument
cluster. For additional
information, REFER to
413-01 . TEST the system for
normal operation.
No
REPAIR Circuit 915 (PK/LB)
between instrument cluster
C220a and DLC C251. For
additional information, REFER
to Communication Circuit Wiring
Repair . TEST the system for
normal operation.
Result / Action to Take
Yes
GO to E2 .
No
GO to E4 .
Yes
REFER to Powertrain
Control/Emissions Diagnosis
(PC/ED) manual Section 3. TEST
the system for normal operation.
No
GO to E3 .
Yes
Section