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Code reading p1633. No we just hooked it up and that's the…

Customer Question
Code reading p1633 Mechanic's...

Code reading p1633

Mechanic's Assistant: Just to clarify, what's the exact code? And have you tried to reset it?

No we just hooked it up and that's the code

Mechanic's Assistant: What is the model/year of your Ford?

2000 Lincoln ls

Mechanic's Assistant: Are you fixing your LS yourself? What have you tried so far?

Yes we have replaced fuel pump starter and battery ..gutted the catalic convertor and it will not turn over

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

It is steadily draining new battery

Submitted: 1 year ago.Category: Ford
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Answered in 9 minutes by:
4/1/2017
Ford Mechanic: Eric, Automotive Repair Shop Manager replied 1 year ago
Eric
Eric, Automotive Repair Shop Manager
Category: Ford
Satisfied Customers: 35,203
Experience: Automotive Repair Shop Manager, Technician
Verified

HI,

P1633 if for too low voltage in the keep alive power in the PCM. This either due to an open circuit in the wiring harness to the pcm or faulty pcm.

At the pcm, there are 3 large wiring harness connectors. Grab one at a time a few inches back and wiggle as someone tries to start it. If it starts when one is wiggles, you will need to go thru each wire at the connector to find loose wire in connector or break in the wiring.

If no difference, the pcm will need to be replaced and new one programmed

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Customer reply replied 1 year ago
do I need a new pcm
Ford Mechanic: Eric, Automotive Repair Shop Manager replied 1 year ago

HI,

If you did the wiggle test I recommended and still didnt start, then yes, you will need a pcm. If it starts while wiggling the wiring at the pcm, then there is a short in the wiring harness at the pcm

If for any reason, you can't rate my answer OKAY, GOOD, or EXCELLENT/3 STARS OR HIGHER today. Please reply and let me know why, so I can help more/better. All follow up responses are FREE, after completing the required rating

Please remember to rate service using the separate rating page. Thank you

Please note that if you have a subscription service, you still are required to rate service, however you are not charged again. This is just so that your expert is credited for their time and services. Thank you.

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Eric, Automotive Repair Shop Manager
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Satisfied Customers: 35,203
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