2003 FORD MUSTANG ECU

switch is turned to RUN or START under normal operation. If there is a PATS problem, this indicator
will either flash rapidly or glow steadily (for more than three seconds) when the ignition switch is turned
to RUN or START. PATS also "blips" the theft indicator every two seconds at ignition OFF to act as a
visual theft deterrent.
The PATS is not compatible with aftermarket remote start systems, which allow the vehicle to be
started from outside the vehicle. These systems may reduce the vehicle security level, and also may
cause no-
start issues. Remote start systems must be removed before investigation of PATS- related
no- start issues. Klj . 2 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

z
check the connections to the vehicle.
z check the ignition switch position.
4. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool manual.
5. Carry out the DATA LINK DIAGNOSTIC TEST. If diagnostic tool responds with: zCKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section 418 -
00 .
z NO RESP/NOT EQUIP for instrument cluster, go to Pinpoint Test A.
z SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs),
erase the continuous DTCs and carry out self- test diagnostics for the instrument cluster.
6. If the DTCs retrieved are related to the concern, go to Instrument Cluster Diagnostic Trouble Code (DTC) Index to continue diagnostics.
7. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics.
Instrument Cluster Diagnostic Trouble Code (DTC) Index Instrument Cluster Diagnostic Trouble Code (DTC) Index DTC Description Source Action
B1202 Fuel Sender Open Circuit ICM REFER to
Section 413
- 01 .
B1204 Fuel Sender Short to Ground ICM REFER to
Section 413
- 01 .
B1213 Anti-
Theft Number of Programmed Keys is Below
Minimum ICM GO to
Pinpoint Test D .
B2103 or
B1232 Antenna Not Connected —
Defective Transceiver ICM GO to
Pinpoint Test E .
B1317 Battery Voltage High ICM REFER to
Section 414
- 00 .
B1318 Battery Voltage Low ICM REFER to
Section 414
- 00 .
B1342 ECU Is Defective ICM REFER to
Section 413
- 01 .
B1356 Ignition Run Circuit Open ICM REFER to
Section 211
- 05 .
B1364 Ignition Start Circuit Open ICM REFER to
Section 211
- 05 .
B1600 PATS Ignition Key Transponder Signal Is Not Received —
Damaged Key or Non-
PATS Key ICM GO to
Pinpoint Test F .
B1601 PATS Received Incorrect Key-Code From Ignition Key
Transponder (Unprogrammed Encoded Ignition Key) ICM GO to
Pinpoint Test G .
B1602 PATS Received Invalid Format Of Key-
Code From Ignition
Key Transponder (Partial Key Read) ICM GO to
Pinpoint Test H .
B1681 PATS Transceiver Signal Is Not Received (Not
Connected, Damaged, or Wiring) ICM GO to
Pinpoint Test I . Klj . 2 ba
182003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

Symptom Chart B2139 PCM ID Does Not Match Between Instrument Cluster and
PCM ICM GO to
Pinpoint Test J .
B2141 NVM Configuration Failure (No PCM ID Exchange
Between Instrument Cluster and PCM) ICM GO to
Pinpoint Test K .
B2143 NVM Memory Failure ICM REFER to
Section 413
- 01
C1284 Oil Pressure Switch Failure ICM REFER to
Section 413
- 01 .
U1147 SCP Invalid or Missing Data for Vehicle Security PCM/SCP GO to
Pinpoint Test C .
U1262 Missing SCP Message J1850 REFER to
Section 418
- 00 .
Symptom Chart Condition
Possible Sources Action
z No communication
with the instrument
cluster z
Central junction box
Fuses:
„5 (15A)
„ 21 (5A)
„ 34 (20A)
z Circuitry
z Instrument cluster z
GO to Pinpoint Test A .
z The anti- theft
indicator is
always/never on —
no three second
theft indicator prove
out z
Instrument cluster
z Theft indicator z
GO to Pinpoint Test B .
z The vehicle does not
start — theft
indicator proves out
for three seconds as
normal z
Less than two keys
programmed to the
system
z Transceiver not
connected/defective
z Circuitry
z Transceiver internal
antenna damaged
z NON- PATS key,
damaged key or no
code received
z Partial key read of
PATS key
z Unprogrammed
PATS key z
CARRY OUT Instrument
Cluster On- Demand
Self- Test. RETRIEVE
DTCs. If DTCs are
present, GO to
Instrument Cluster
Diagnostics Trouble
Code (DTC) Index. If no
DTCs are retrieved,
CHECK for other
possible no- start
causes.
z No PCM ID stored in
PATS
z PATS/PCM ID do not
match
z Problem with SCP
link z
CLEAR the stored
DTCs. CYCLE the
ignition key from OFF to
RUN. RETRIEVE
continuous DTCs. If
DTCs are present, GO
to Instrument Cluster
Diagnostics Trouble
Code (DTC) Index. If no Klj . 3 ba
182003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

PINPOINT TEST J: THE ANTI-
THEFT SYSTEM DOES NOT OPERATE
CORRECTLY — PCM ID DOES NOT MATCH BETWEEN
INSTRUMENT CLUSTER AND PCM PINPOINT TEST K: THE ANTI - THEFT SYSTEM DOES NOT OPERATE If other DTCs are retrieved,
REFER to Instrument Cluster
Diagnostic Trouble Code (DTC)
Index.
Test Step Result / Action to Take
J1 USE THE DTCS FROM THE
INSTRUMENT CLUSTER SELF
TESTS z
Use the recorded results
from the Instrument
Cluster Continuous and
On- Demand Self- Tests.
z Is DTC B2139 recorded? Yes
GO to
J2 .
No
System is OK. J2 CLEAR PCM ID FROM
INSTRUMENT CLUSTER AND
PCM z
Carry out the security
access procedure for the
instrument cluster. For
additional information,
refer to Security Access —
Procedure .
z NOTE: DO NOT carry out
ignition key code erase.
z Select FSF card
PARAMETER RESET
command for instrument
cluster.
z Use diagnostic card for
PCM Active Command
Keep Alive Memory
Reset.
z Key in OFF position.
z Select FSF card
PARAMETER RESET
command for PCM.
z Key in ON position.
z Turn the ignition switch to
RUN for three seconds.
z Enter the following
diagnostic mode on the
diagnostic tool: Clear
Continuous DTCs.
z Key in OFF position.
z Enter the following
diagnostic mode on the
diagnostic tool: Retrieve
Continuous DTCs.
z Is DTC B2139 retrieved? Yes
VERIFY PCM calibration is correct for the vehicle. If correct,
REPEAT Step J2. If fault code persists, INSTALL a new
instrument cluster; for additional information, REFER to
Section 413
- 01 . CYCLE the ignition to RUN using two
encoded ignition keys. REPEAT Pinpoint Test J . CLEAR the
DTCs. TEST the system for normal operation. If DTC B2139
still exists, INSTALL a new PCM; for additional information,
REFER to Section 303 - 14 . REPEAT the self-
test. CLEAR the
DTCs.
No
System is OK. CHECK for any other DTCs. REFER to the
instrument cluster Diagnostic Trouble Code Index. Klj . 16 ba
182003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

GENERAL PROCEDURES
Key Programming —
Erase All Key Codes and Program Two
Keys
NOTE: This procedure is used when a customer needs keys programmed into the system and does
not have two programmed ignition keys available. This procedure is also useful when programmed
ignition key(s) have been lost or the ignition switch assembly has been replaced, and it is desired to
erase key(s) from the passive anti- theft system (PATS) memory.
NOTE: This procedure will erase all programmed ignition keys from the vehicle memory and the
vehicle will not start until two keys have been reprogrammed to the vehicle.
NOTE: Two PATS encoded keys with the correct mechanical cut must be available to perform this
procedure. One or both of them may be the customer's original keys.
NOTE: If additional keys are to be programmed, refer to Key Programming — Program a Key Using
Two Programmed Keys. If the remaining keys are with the customer and are not available with the
vehicle, then instruct the customer to refer to the Owners Guide under the "Programming Spare
[SecuriLock ® (North America), Safeguard ® ( U.K.) or PATS for all other markets] Keys Procedure" for
instructions on programming the remaining keys.
1. Turn the ignition switch from OFF to RUN.
2. Enter diagnostic tool. Follow the SECURITY ACCESS PROCEDURE to obtain security access.
3. From diagnostic tool menu, select IGNITION KEY CODE ERASE.
4. NOTE: Do NOT select any additional commands from this menu.
Turn the ignition switch to OFF and disconnect diagnostic tool.
5. Insert the first encoded key into the ignition lock cylinder and turn the switch to RUN for three seconds.
6. Insert the second encoded key into the ignition lock cylinder and turn the switch to RUN for three seconds.
7. The vehicle should now start with both ignition keys.
SECTION 419-
01: Anti-Theft — PATS 2003 Mustang Workshop Manual Special Tool(s)
Worldwide Diagnostic System
(WDS)
418-
F224,
New Generation STAR (NGS)
Tester
418- F052 or equivalent
diagnostic tool Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

GENERAL PROCEDURES
Key Programming —
Program a Key Using Two
Programmed Keys
NOTE: This procedure only works if two or more programmed ignition keys are available and it is
desired to program additional key(s). If two keys are not available, follow the procedure in Key Programming — Erase All Key Codes and Program Two Keys .
NOTE: PID SPARE_KY must be enabled for this procedure to operate. If this Parameter Identification
(PID) Index is not enabled, follow the security access procedure and select Spare Key Programming
Switch: Enabled.
NOTE: If the programming procedure is successful, the new key(s) will start the vehicle and the
THEFT INDICATOR will illuminate for approximately three seconds.
NOTE: If the programming procedure is not successful, the new key(s) will not start the vehicle and the
THEFT INDICATOR will flash. If the programming procedure was not successful, repeat the key
programming procedure from Step 1. If the failure repeats, check Circuit 729 (RD/WH) (hot at all times)
in instrument cluster for proper battery voltage. Repair the circuit if voltage is not present. For
additional information, refer to Diagnosis and Testing to review diagnostic trouble codes (DTCs) and
perform pinpoint tests as required.
NOTE: A maximum of eight ignition keys can be programmed to a passive anti- theft system (PATS)
equipped vehicle. Use PID NUMKEYS to determine how many keys are programmed to the vehicle.
NOTE: If the steps are not performed as outlined, the programming procedure will end.
NOTE: Ignition keys must have correct mechanical key cut for the vehicle and must be a PATS
encoded key.
1. Insert the first programmed ignition key into the ignition lock cylinder and turn the ignition switch from OFF to RUN (maintain the ignition switch in RUN for one second).
2. Turn the ignition switch to OFF and remove the first key from the ignition lock cylinder.
3. Within five seconds of turning the ignition switch to OFF, insert the second programmed ignition key into the ignition lock cylinder and turn the ignition switch from OFF to RUN (maintain the
ignition switch in RUN for one second).
4. Turn the ignition switch to OFF and remove the second key from the ignition lock cylinder.
5. Within 10 seconds of turning the ignition lock cylinder to OFF, insert the unprogrammed ignition key (new key) into the ignition lock cylinder and turn the ignition switch from OFF to RUN
SECTION 419-
01: Anti-Theft — PATS 2003 Mustang Workshop Manual Special Tool(s)
Worldwide Diagnostic System
(WDS)
418-
F224,
New Generation STAR (NGS)
Tester
418- F052, or equivalent
diagnostic tool Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

GENERAL PROCEDURES
Key Programming —
Enable/Disable Spare Key
Programming
NOTE: The spare key programming switch is a diagnostic tool programmable switch that provides the
capability to enable/disable the spare key programming procedure. This procedure is in the Owners
Guide spare key programming procedure or in this section under Key Programming — Program a Key
Using Two Programmed Keys . This programmable switch is provided as a convenience for rental
company fleets or other fleet purchasers who may not want the spare key programming procedure
available to the vehicle driver.
NOTE: The spare key programming switch state can be viewed by instrument cluster PID SPARE_KY.
1. Insert a programmed ignition key into the ignition lock cylinder and turn the ignition switch to RUN.
2. Enter diagnostic tool. Follow the SECURITY ACCESS PROCEDURE. For additional information, refer to Security Access — Procedure to obtain security access.
3. NOTE: The default setting on delivery of all new vehicles is .
From diagnostic tool menu, select SPARE KEY PROGRAMMING SWITCH selection to the
desired setting:
Spare key programming procedure is accessible.
Spare key programming procedure is not accessible.
SECTION 419-
01: Anti-Theft — PATS 2003 Mustang Workshop Manual Special Tool(s)
Worldwide Diagnostic System
(WDS)
418-
F224,
New Generation STAR (NGS)
Tester
418- F052, or equivalent
diagnostic tool Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

GENERAL PROCEDURES
Key Programming —
Additional Key With One Programmed
Key
NOTE: This procedure is used when a customer needs to have an additional key programmed into the
vehicle without erasing stored key codes, but does not have two programmed keys available. This
procedure is also useful when attempting to determine if an ignition key is defective, as a new key can
be installed without erasing keys or without having two programmed keys available.
NOTE: Before programming, the new key must have the correct mechanical cut for the ignition lock.
NOTE: If eight keys are already programmed, this procedure will not allow any further ignition keys to
be programmed without erasing all stored key codes first. The number of keys programmed into the
system can be determined using the PID NUMKEYS.
1. Turn the ignition switch from the OFF position to the RUN position using the new, unprogrammed ignition key.
2. Enter diagnostic tool using the Ford Service Function (FSF) card and enter the appropriate instrument cluster. Follow Security Access to obtain security access. For additional information,
refer to Security Access — Procedure .
3. From the diagnostic tool menu Select: IGNITION KEY CODE PROGRAM.
4. Turn the ignition switch to the OFF position and disconnect diagnostic tool.
5. Attempt to start the engine with the new ignition key. The vehicle engine should start and run normally.
SECTION 419-
01: Anti-Theft — PATS 2003 Mustang Workshop Manual Special Tool(s)
Worldwide Diagnostic System
(WDS)
418-
F224,
New Generation STAR (NGS)
Tester
418- F052, or equivalent
diagnostic tool Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...