Ford Focus Mk1 - ECU Problems ?????
Thread Starter
Virgin
Joined: Aug 2025
Posts: 2
Likes: 0
Ford Focus Mk1 - ECU Problems ?????
Hello All,
I hope that someone can help and offer advice with this issue - which as a newbee I don't understand !
Ford Focus 2003 will not start/ turn over. Starter motor tested OK.
Correct key - i.e. started car previously - central locking still works both with key and with remote.
The battery had been allowed to discharge - we then took the battery off the car, recharged it and then put it back in the car. (car had been running normally before this - no miss fires, not in limp mode) - could this cause the issue?
We found a local guy who checked the car out with his software (Forscan?), and found the same fault codes as we did. He told me there were 8 keys registered (which seems very unlikely the previous owner had 8 keys!) and that he couldn't re-programme any keys (as he thought he would be able to do).
What can you draw from the above results ?
Scanned with results as follows;-
Make: FORD
Model: Focus 1.6L
Year: 2003
PCM Powertrain Control Module
DTC Description
P1000 On-Board Diagnostic (OBD) Systems Readiness
Test Not Complete
B1601 PATS(Passive Anti Theft System) received incorrect
key-code from ignition transponder.
B1342 ECU(Electronic control unit) internal fault
Markings on Central Locking Module/ GEM
Siemens 1S7T-15K600-KE
Markings on ECU
Visteon LP4-335 1-00 0287 2ANA 1M5F-12A650-BE
308 009 OSRAM SYLVANIA E9AF 14A624 AA FOAF-14A459-AA
Could this be problem with key, the immobiliser transponder (located around the lock barrel), the GEM or ECU (or both the latter)?
Any expertise, opinions and suggested course of action would be gratefully received.
Therefore I would be grateful if anyone could please advise of the most likely cause of this issue and suggest a successful remedy.
Thanking you in advance for your time and consideration, I look forward to any replies!
I hope that someone can help and offer advice with this issue - which as a newbee I don't understand !
Ford Focus 2003 will not start/ turn over. Starter motor tested OK.
Correct key - i.e. started car previously - central locking still works both with key and with remote.
The battery had been allowed to discharge - we then took the battery off the car, recharged it and then put it back in the car. (car had been running normally before this - no miss fires, not in limp mode) - could this cause the issue?
We found a local guy who checked the car out with his software (Forscan?), and found the same fault codes as we did. He told me there were 8 keys registered (which seems very unlikely the previous owner had 8 keys!) and that he couldn't re-programme any keys (as he thought he would be able to do).
What can you draw from the above results ?
Scanned with results as follows;-
Make: FORD
Model: Focus 1.6L
Year: 2003
PCM Powertrain Control Module
DTC Description
P1000 On-Board Diagnostic (OBD) Systems Readiness
Test Not Complete
B1601 PATS(Passive Anti Theft System) received incorrect
key-code from ignition transponder.
B1342 ECU(Electronic control unit) internal fault
Markings on Central Locking Module/ GEM
Siemens 1S7T-15K600-KE
Markings on ECU
Visteon LP4-335 1-00 0287 2ANA 1M5F-12A650-BE
308 009 OSRAM SYLVANIA E9AF 14A624 AA FOAF-14A459-AA
Could this be problem with key, the immobiliser transponder (located around the lock barrel), the GEM or ECU (or both the latter)?
Any expertise, opinions and suggested course of action would be gratefully received.
Therefore I would be grateful if anyone could please advise of the most likely cause of this issue and suggest a successful remedy.
Thanking you in advance for your time and consideration, I look forward to any replies!
PassionFord Post Whore!!
Joined: Mar 2006
Posts: 4,925
Likes: 128
From: Lincs.
Could be just the receiver, worth a try.
Not keen on the ECU internal fault though
Be honest! Did you put the battery on reverse polarity...at all.
Not keen on the ECU internal fault though
Be honest! Did you put the battery on reverse polarity...at all.
Last edited by GVK.; Aug 30, 2025 at 09:38 PM.
Thread Starter
Virgin
Joined: Aug 2025
Posts: 2
Likes: 0
Thanks for your reply.
Being a bit non techy could you please clarify/specify what part you mean by "receiver' and further expand on what you mean by "not keen" on the ECU internal fault though"
Many thanks again I look forward to your reply & further help.
Kind regards
PassionFord Post Whore!!
Joined: Mar 2006
Posts: 4,925
Likes: 128
From: Lincs.
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