Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2001FOCUS ZX3 L4-2.0L DOHC VIN 3REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSCUSTOMER INTERESTENGINE CONTROLS - DTC P1635 SET AFTER PCM/IC REPLACEMENTOVERVIEW
2001 Ford Focus ZX3 L4-2.0L DOHC VIN 3
Engine Controls - DTC P1635 Set After PCM/IC Replacement: Overview
2001 Ford Focus ZX3 L4-2.0L DOHC VIN 3SECTION Overview
Article No.
02-23-4
11/25/02
^ DIAGNOSTIC TROUBLE CODE (DTC) - P1635
AND/OR P1639 PRESENT AFTER POWERTRAIN
CONTROL MODULE (PCM) OR INSTRUMENT
CLUSTER REPLACEMENT - GASOLINE ENGINE
VEHICLES ONLY
^ LAMP - 4X4 LAMP ILLUMINATED AFTER
POWERTRAIN CONTROL MODULE (PCM) OR
INSTRUMENT CLUSTER REPLACEMENT -
GASOLINE ENGINE VEHICLES ONLY
^ SPEEDOMETER - INACCURATE AND/OR
INOPERATIVE AFTER POWERTRAIN CONTROL
MODULE (PCM) OR INSTRUMENT CLUSTER
REPLACEMENT - GASOLINE ENGINE VEHICLES
ONLY
FORD:
1999-2002 MUSTANG
2000-2002 FOCUS
1999-2002 EXPEDITION, F-150
2000-2002 E SERIES
2001-2002 EXPLORER SPORT TRAC, EXPLORER SPORT, RANGER
2002 EXPLORER
LINCOLN:
1999-2002 TOWN CAR, NAVIGATOR
2002 BLACKWOOD
MERCURY:
2002 MOUNTAINEER
Article 02-5-8 is being republished in its entirety to update the Service Procedure and to clarify build dates for Explorer.
This article applies to all vehicles listed with the exception of 2002 Explorer. This article applies to 2002 Explorer (SLAP) St. Louis Assembly Plant built before 3/11/2002 and 2002 Explorer (LAP) Louisville Assembly Plant built before 3/4/2002 only.
ISSUE
Some vehicles may exhibit an inoperative or inaccurate speedometer, 4x4 lamp illuminated, and/or Diagnostic Trouble Code (DTCs) P1635 or P1639 present after a Powertrain Control Module (PCM) or Instrument Cluster replacement. This may be caused by the Vehicle Identification (VID) block that must be programmed when replacing the PCM.
ACTION
As part of the calibration, there is an area referred to as the Vehicle Identification (VID) block. The VID block must be programmed when replacing the PCM. Failure to perform the proper Programmable Module Installation procedure may generate fault code: P1639 VID Block not programmed or is corrupt--P1635 Tire/Axle Out Of Acceptable Range. Refer to the following procedures to ensure the PCM is properly configured.
OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 02-5-8
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 204000, 204100, 206000, 690000, 698298
Disclaimer
02-23-4
11/25/02
^ DIAGNOSTIC TROUBLE CODE (DTC) - P1635
AND/OR P1639 PRESENT AFTER POWERTRAIN
CONTROL MODULE (PCM) OR INSTRUMENT
CLUSTER REPLACEMENT - GASOLINE ENGINE
VEHICLES ONLY
^ LAMP - 4X4 LAMP ILLUMINATED AFTER
POWERTRAIN CONTROL MODULE (PCM) OR
INSTRUMENT CLUSTER REPLACEMENT -
GASOLINE ENGINE VEHICLES ONLY
^ SPEEDOMETER - INACCURATE AND/OR
INOPERATIVE AFTER POWERTRAIN CONTROL
MODULE (PCM) OR INSTRUMENT CLUSTER
REPLACEMENT - GASOLINE ENGINE VEHICLES
ONLY
FORD:
1999-2002 MUSTANG
2000-2002 FOCUS
1999-2002 EXPEDITION, F-150
2000-2002 E SERIES
2001-2002 EXPLORER SPORT TRAC, EXPLORER SPORT, RANGER
2002 EXPLORER
LINCOLN:
1999-2002 TOWN CAR, NAVIGATOR
2002 BLACKWOOD
MERCURY:
2002 MOUNTAINEER
Article 02-5-8 is being republished in its entirety to update the Service Procedure and to clarify build dates for Explorer.
This article applies to all vehicles listed with the exception of 2002 Explorer. This article applies to 2002 Explorer (SLAP) St. Louis Assembly Plant built before 3/11/2002 and 2002 Explorer (LAP) Louisville Assembly Plant built before 3/4/2002 only.
ISSUE
Some vehicles may exhibit an inoperative or inaccurate speedometer, 4x4 lamp illuminated, and/or Diagnostic Trouble Code (DTCs) P1635 or P1639 present after a Powertrain Control Module (PCM) or Instrument Cluster replacement. This may be caused by the Vehicle Identification (VID) block that must be programmed when replacing the PCM.
ACTION
As part of the calibration, there is an area referred to as the Vehicle Identification (VID) block. The VID block must be programmed when replacing the PCM. Failure to perform the proper Programmable Module Installation procedure may generate fault code: P1639 VID Block not programmed or is corrupt--P1635 Tire/Axle Out Of Acceptable Range. Refer to the following procedures to ensure the PCM is properly configured.
OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 02-5-8
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 204000, 204100, 206000, 690000, 698298
Disclaimer
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.