Ford 2003 Mustang Workshop Manual page 3534

Check in-line C215 for damage; repair as necessary.
Measure the resistance between in-line C215 Pin 10,
Circuit 914 (TN/OG), harness side and DLC C251 Pin
2, Circuit 914 (TN/OG), harness side.
Is the resistance less than 5 ohms?
E4 CHECK FOR OPEN BETWEEN DLC C251 PIN 10 AND
PCM C175 PIN 15 — CIRCUIT 915 (PK/LB)
Key in OFF position.
Disconnect the diagnostic tool.
Measure the resistance between PCM C175 Pin 15,
Circuit 915 (PK/LB), harness side and DLC C251 Pin
10, Circuit 915 (PK/LB), harness side.
Is the resistance less than 5 ohms?
E5 CHECK CIRCUIT 915 (PK/LB) BETWEEN DLC C251
AND IN-LINE C215 FOR OPEN
Disconnect: In-Line C215.
Check in-line C215 for damage; repair as necessary.
Measure the resistance between in-line C215 Pin 13,
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 F: NO MODULE/NETWORK COMMUNICATION —
ISO 9141 COMMUNICATION NETWORK
REPAIR Circuit 914 (TN/OG)
between PCM C175 and in-line
C215. For additional information,
REFER to Communication Circuit
Wiring Repair . TEST the system
for normal operation.
No
REPAIR Circuit 914 (TN/OG)
between DLC C251 and in-line
C215. For additional information,
REFER to Communication Circuit
Wiring Repair . TEST the system
for normal operation.
Yes
REFER to Powertrain
Control/Emissions Diagnosis
(PC/ED) manual Section 3. TEST
the system for normal operation.
No
GO to E5 .
Yes
REPAIR Circuit 915 (PK/LB)
between PCM C175 and in-line
C215. For additional information,
REFER to Communication Circuit
Wiring Repair . TEST the system
for normal operation.
No
REPAIR Circuit 915 (PK/LB)
between DLC C251 and in-line
C215. For additional information,
REFER to Communication Circuit
Wiring Repair . TEST the system
for normal operation.