2003 FORD MUSTANG key

z
Is the resistance less than 5 ohms? information, REFER to
Communication Circuit Wiring
Repair . TEST the system for
normal operation. A6 CHECK FOR OPEN BETWEEN DLC C251 AND ANTI-
LOCK BRAKE CONTROL MODULE C135 — CIRCUIT 915
(PK/LB) z
Key in OFF position.
z Disconnect the diagnostic tool.
z Measure the resistance between anti- lock brake control
module C135 Pin 29, Circuit 915 (PK/LB), harness side
and DLC C251 Pin 10, Circuit 915 (PK/LB), harness
side.
z Is the resistance less than 5 ohms? Yes
INSTALL a new anti-
lock brake
control module. REFER to
Section 206 - 09B . TEST the
system for normal operation.
No
GO to A7 .
A7 CHECK CIRCUIT 915 (PK/LB) BETWEEN DLC C251
AND IN- LINE C144 FOR OPEN z
Disconnect: In- Line C144.
z Check in-line C144 for damage; repair as necessary.
z Measure the resistance between in- line C144 Pin 13,
Circuit 915 (PK/LB), harness side and DLC C251 Pin
10, Circuit 915 (PK/LB), harness side.
z Is the resistance less than 5 ohms? Yes
REPAIR Circuit 915 (PK/LB)
between anti-
lock brake control
module C135 and in- line C144.
For additional information,
REFER to Communication Circuit Wiring Repair . TEST the
system for normal operation.
No
GO to A8 .
A8 CHECK CIRCUIT 915 (PK/LB) BETWEEN DLC C251
AND IN- LINE C215 FOR OPEN z
Disconnect: In- Line C215.
z Check in-line C215 for damage; repair as necessary.
z Measure the resistance between in- line C215 Pin 13,
Circuit 915 (PK/LB), harness side and DLC C251 Pin Yes
REPAIR Circuit 915 (PK/LB)
between in-
line C144 and in- line
C215. For additional Klj . 6 ba
212003 Mustang Workshop Manual
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10, Circuit 915 (PK/LB), harness side.
z Is the resistance less than 5 ohms? 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. A9 CHECK FOR OPEN BETWEEN THE DLC C251 AND
ANTI- LOCK BRAKE CONTROL MODULE C135 — CIRCUIT
70 (LB/WH) z
Key in OFF position.
z Disconnect: Anti- Lock Brake Control Module C135.
z Inspect anti- lock brake control module C135 for
damage, repair as necessary.
z Measure the resistance between anti- lock brake control
module C135 Pin 24, Circuit 70 (LB/WH), harness side
and DLC C251 Pin 7, Circuit 70 (LB/WH), harness side.
z Is the resistance less than 5 ohms? Yes
INSTALL a new anti-
lock brake
control module. REFER to
Section 206 - 09A . TEST the
system for normal operation.
No
GO to A10 .
A10 CHECK FOR OPEN BETWEEN THE DLC C251 AND
IN- LINE C140 z
Disconnect: In- Line C140.
z Inspect in- line C140 for damage, repair as necessary.
z Measure the resistance between in- line C140 Pin 7,
Circuit 70 (LB/WH), harness side and DLC C251 Pin 7,
Circuit 70 (LB/WH), harness side.
z Is the resistance less than 5 ohms? Yes
REPAIR Circuit 70 (LB/WH)
between in-
line C140 and anti-
lock brake control module C135.
TEST the system for normal
operation.
No
GO to A11 .
A11 CHECK FOR OPEN BETWEEN THE DLC C251 AND
IN- LINE C314 z
Disconnect: In- Line C314.
z Inspect in- line C314 for damage, repair as necessary. Yes
REPAIR Circuit 70 (LB/WH) Klj . 7 ba
212003 Mustang Workshop Manual
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PINPOINT TEST B: THE MODULE DOES NOT RESPOND TO THE
DIAGNOSTIC TOOL —
GENERIC ELECTRONIC MODULE (GEM)
PINPOINT TEST C: THE MODULE DOES NOT RESPOND TO THE
DIAGNOSTIC TOOL — RESTRAINT CONTROL MODULE (RCM) z
Measure the resistance between in- line C314 Pin 1,
Circuit 70 (LB/WH), harness side and DLC C257 Pin 7,
Circuit 70 (LB/WH), harness side.
z Is the resistance less than 5 ohms? between in-
line C314 and in- line
C140. TEST the system for
normal operation.
No
REPAIR Circuit 70 (LB/WH)
between in- line C314 and DLC
C251. TEST the system for
normal operation. Test Step Result / Action to Take
B1 CHECK FOR OPEN BETWEEN THE DLC C251 AND GEM
C201e z
Key in OFF position.
z Disconnect: GEM C201e.
z Inspect GEM C201e for damage, repair as necessary.
z Measure the resistance between GEM C201e Pin 6, Circuit
70 (LB/WH), harness side and DLC C251 Pin 7, Circuit 70
(LB/WH), harness side.
z Is the resistance less than 5 ohms? Yes
INSTALL a new GEM. For
additional information,
REFER to
Section 419 - 10 .
TEST the system for normal
operation.
No
REPAIR Circuit 70 (LB/WH)
between the GEM C201e
and DLC C251. TEST the
system for normal
operation. Test Step Result / Action to Take
C1 CHECK CIRCUIT 70 (LB/WH) FOR OPEN
z
Key in OFF position.
z Inspect the DLC C251 and diagnostic tool terminal for
damage; repair as necessary.
z Deactivate the air bag system. Refer to Section 501 - 20B .
z Disconnect: RCM C2041.
z Inspect RCM C2041 for damage, repair as necessary.
z Measure the resistance between DLC C251 Pin 7, Circuit 70 Yes
INSTALL a new RCM.
REFER to
Section 501 -
20B . TEST the system for
normal operation.
No Klj . 8 ba
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PINPOINT TEST D: THE MODULE DOES NOT RESPOND TO THE
DIAGNOSTIC TOOL —
INSTRUMENT CLUSTER (LB/WH), harness side and RCM C2041 Pin 5, Circuit 70
(LB/WH), harness side.
z Is the resistance less than 5 ohms? REPAIR Circuit 70
(LB/WH) between RCM
C2041 and DLC C251 .
TEST the system for
normal operation.
Test Step Result / Action to Take
D1 CHECK INSTRUMENT CLUSTER C220a FOR DAMAGE
z
Key in OFF position.
z Disconnect: Instrument Cluster C220a.
z Inspect instrument cluster C220a for damage; repair as
necessary.
z Connect: Instrument Cluster C220a.
z Connect the diagnostic tool.
z Key in ON position.
z Enter the following diagnostic mode on the diagnostic
tool: Diagnostic Data Link.
z Was the result received ICM: NO RESPONSE ON
CKT914 (BUS+)? Yes
GO to
D2 .
No
GO to D3 .
D2 CHECK FOR OPEN BETWEEN DLC C251 PIN 2 AND
INSTRUMENT CLUSTER C220a PIN 1 — CIRCUIT 914
(TN/OG) z
Key in OFF position.
z Disconnect the diagnostic tool.
z Disconnect: Instrument Cluster C220a.
z Measure the resistance between instrument cluster
C220a Pin 1, Circuit 914 (TN/OG), harness side and
DLC C251 Pin 2, Circuit 914 (TN/OG), harness side.
z Is the resistance less than 5 ohms? Yes
INSTALL a new instrument
cluster. For additional
information, REFER to
Section 413 - 01 . TEST the system for
normal operation.
No
REPAIR Circuit 914 (TN/OG)
between instrument cluster
C220a and DLC C251. For
additional information, REFER
to Communication Circuit Wiring Repair . TEST the system for
normal operation. D3 CHECK FOR OPEN BETWEEN DLC C251 PIN 10 AND
INSTRUMENT CLUSTER C220a PIN 2 — CIRCUIT 915
(PK/LB) z
Key in OFF position. Yes Klj . 9 ba
212003 Mustang Workshop Manual
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PINPOINT TEST E: THE MODULE DOES NOT RESPOND TO THE
DIAGNOSTIC TOOL —
POWERTRAIN CONTROL MODULE (PCM) z
Disconnect the diagnostic tool.
z 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.
z Is the resistance less than 5 ohms? INSTALL a new instrument
cluster. For additional
information, REFER to
Section 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. Test Step Result / Action to Take
E1 CHECK PCM C175 FOR DAMAGE
z
Key in OFF position.
z Disconnect: PCM C175.
z Inspect PCM C175 for damage; repair as necessary.
z Connect: PCM C175.
z Connect the diagnostic tool.
z Key in ON position.
z Enter the following diagnostic mode on the diagnostic
tool: Diagnostic Data Link.
z Was the result received PCM: NO RESPONSE ON
CKT914 (BUS+)? Yes
GO to
E2 .
No
GO to E4 .
E2 CHECK FOR OPEN BETWEEN DLC C251 PIN 2 AND
PCM C175 PIN 16 — CIRCUIT 914 (TN/OG) z
Key in OFF position.
z Disconnect the diagnostic tool.
z Disconnect: PCM C175.
z 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.
z Is the resistance less than 5 ohms? Yes
REFER to Powertrain
Control/Emissions Diagnosis
(PC/ED) manual Section 3. TEST
the system for normal operation.
No
GO to
E3 .
E3 CHECK CIRCUIT 914 (TN/OG) BETWEEN DLC C251
AND IN- LINE C215 FOR OPEN z
Disconnect: In- Line C215. Yes Klj . 10 ba
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PINPOINT TEST F: NO MODULE/NETWORK COMMUNICATION —
ISO 9141 COMMUNICATION NETWORK z
Check in-line C215 for damage; repair as necessary.
z 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.
z Is the resistance less than 5 ohms? 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. E4 CHECK FOR OPEN BETWEEN DLC C251 PIN 10 AND
PCM C175 PIN 15 — CIRCUIT 915 (PK/LB) z
Key in OFF position.
z Disconnect the diagnostic tool.
z 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.
z Is the resistance less than 5 ohms? Yes
REFER to Powertrain
Control/Emissions Diagnosis
(PC/ED) manual Section 3. TEST
the system for normal operation.
No
GO to
E5 .
E5 CHECK CIRCUIT 915 (PK/LB) BETWEEN DLC C251
AND IN- LINE C215 FOR OPEN z
Disconnect: In- Line C215.
z Check in-line C215 for damage; repair as necessary.
z 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.
z Is the resistance less than 5 ohms? 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. Klj . 11 ba
212003 Mustang Workshop Manual
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Test Step Result / Action to Take
F1 CHECK CIRCUIT 70 (LB/WH) FOR OPEN
z
Key in OFF position.
z Inspect the DLC C251 Pin 7, Circuit 70 (LB/WH) for
damage, repair as necessary.
z Disconnect: GEM C201e.
z Measure the resistance between GEM C201e Pin 6,
Circuit 70 (LB/WH), harness side and DLC C251 Pin 7,
Circuit 70 (LB/WH), harness side.
z Is the resistance less than 5 ohms? Yes
GO to
F2 .
No
REPAIR Circuit 70 (LB/WH)
between the GEM C201e and
DLC C251. TEST the system
for normal operation. F2 CHECK FOR SHORT TO GROUND AND POWER AT
DLC C251 — GEM C201e DISCONNECTED z
Key in ON position.
z Measure the voltage between DLC C251 Pin 7, Circuit 70
(LB/WH), harness side and C251 Pin 4, Circuit 1205
(BK); and between DLC C251 Pin 7, Circuit 70 (LB/WH),
harness side and C251 Pin 16, Circuit 1047 (LG/RD),
harness side.
z Is the voltage indicated in either measurement zero
volts? Yes
CONNECT the GEM module
C201e. GO to
F3 .
No
INSTALL a new GEM. For
additional information, REFER
to Section 419 - 10 . TEST the
system for normal operation. F3 CHECK FOR SHORT TO GROUND AND POWER AT
DLC C251 — IN-LINE C314 DISCONNECTED z
Key in OFF position.
z Disconnect: In- Line C314.
z Key in ON position.
z Measure the voltage between DLC C251 Pin 7, Circuit 70
(LB/WH), harness side and C251 Pin 4, Circuit 1205
(BK); and between DLC C251 Pin 7, Circuit 70 (LB/WH),
harness side and C251 Pin 16, Circuit 1047 (LG/RD),
harness side. Yes
GO to
F4 .
No
GO to F5 . Klj . 12 ba
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z
Is the voltage indicated in either measurement zero
volts? F4 CHECK FOR SHORT TO GROUND AND POWER AT
DLC C251 — RCM C2041 DISCONNECTED z
Key in OFF position.
z Deactivate the air bag system; REFER to Section 501 -
20B .
z Disconnect: RCM C2041.
z Key in ON position.
z Measure the voltage between DLC C251 Pin 7, Circuit 70
(LB/WH), harness side and C251 Pin 4, Circuit 1205
(BK); and between DLC C251 Pin 7, Circuit 70 (LB/WH),
harness side and C251 Pin 16, Circuit 1047 (LG/RD),
harness side.
z Is the voltage indicated in either measurement zero
volts? Yes
REPAIR Circuit 70 (LB/WH)
between DLC C251, GEM
C201e, RCM C2041, and in-
line C314. TEST the system
for normal operation.
No
INSTALL a new RCM. REFER
to
Section 501 - 20B . TEST the
system for normal operation. F5 CHECK FOR THE ANTI-
LOCK BRAKE CONTROL
MODULE z
Key in OFF position.
z Connect: In- Line C3141.
z Check the vehicle for any version of the anti- lock brake
control module.
z Is the vehicle equipped with any version of the anti-
lock brake control module (with or without traction
control)? Yes
GO to
F6 .
No
GO to F7 .
F6 CHECK FOR SHORT TO GROUND AND POWER AT
DLC C251 — ANTI-LOCK BRAKE CONTROL MODULE C135
DISCONNECTED z
Disconnect: Anti- Lock Brake Control Module C135.
z Key in ON position.
z Measure the voltage between DLC C251 Pin 7, Circuit 70
(LB/WH), harness side and C251 Pin 4, Circuit 1205
(BK); and between DLC C251 Pin 7, Circuit 70 (LB/WH),
harness side and C251 Pin 16, Circuit 1047 (LG/RD),
harness side. Yes
GO to
F7 .
No
INSTALL a new anti- lock brake
control module. For additional
information on the anti- lock
brake control module without
traction control, REFER to Klj . 13 ba
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