Crankshaft position sensor relearn

Tiny
JONES3RD
  • MEMBER
  • 1999 CADILLAC ESCALADE
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 197,211 MILES
How do you relearn the crankshaft position sensor with a scan tool or without one for that matter if you cannot start the vehicle due to this problem? Everything I have seen says to crank the vehicle for the relearn process to start and then go through the rest of the steps. This initially started when I changed the starter out.
Monday, November 11th, 2019 AT 2:04 PM

12 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Good afternoon,

The engine has to run for the crank relearn. You must use a scan tool for this procedure. There is no other procedure at all.

Give me some background and tell me the issue you have at this moment.

Roy
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Monday, November 11th, 2019 AT 2:30 PM
Tiny
JONES3RD
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Initially the starter went out and I replaced it and it ran about three days and it wouldn't start again so I was thinking either the starter solenoid or the ignition switch or wiring but I had a warranty on it so I traded it for another one and it hasn't started again! The second starter had warning papers about the new starters could make your PCM and crankshaft position sensor to be faulty. It took forever just to get the new starter to line with the flex-plate. Finally removed the solenoid and dust cover so I could make sure the teeth were perfectly gaped and angled now I'm at a crank no start and the only codes that come up are C0503, B1004, and U1304.
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Tuesday, November 12th, 2019 AT 1:50 AM
Tiny
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Okay, when you try to start it, is the theft light or security light on? It should go out after 10 seconds with the key on.

https://www.2carpros.com/articles/how-to-reset-a-security-system

I attached a wiring diagram for the starting circuit. Can you do some testing with me for the system to find the fault?

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Wednesday, November 13th, 2019 AT 12:07 PM
Tiny
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I'll check so the fuses again but I'm pretty sure there wiring is so good because I replaced the old with new from the starter to battery, ignition wire and grounds to the body, motor and frame. C0503 says steering assist control solenoid low and the Delco part number that is given does not show up on their website and everything online says something about ABS left front wheel.
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Wednesday, November 13th, 2019 AT 1:54 PM
Tiny
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Okay, but none of that has to do with the starting.

Can you test for power to the relay so we can find the reason it is not starting?

Roy
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Wednesday, November 13th, 2019 AT 2:06 PM
Tiny
JONES3RD
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Relays and fuses are all good. I checked where is a multi tester to make sure they would just opening and closing that they were actually good. Seems like my ignition timing is off. I don't know how it would have happened. Plus it backfired while trying to crank it a couple times yesterday like it is advanced too much.
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Thursday, November 14th, 2019 AT 9:18 AM
Tiny
ASEMASTER6371
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What were the powers to the relay? I need to know that voltage. We need to start somewhere and that is where we start.

Roy
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Thursday, November 14th, 2019 AT 9:33 AM
Tiny
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I'll get you exact numbers as soon as I get back to the vehicle. I appreciate your help. Are you familiar with the gm starters causing there PCM to malfunction and not cause a code or engine light to come on.
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Thursday, November 14th, 2019 AT 11:47 AM
Tiny
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The starter will not cause damage to the PCM. They are not connected in any way.

Roy
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Thursday, November 14th, 2019 AT 11:55 AM
Tiny
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Sorry I meant damage to the crankshaft position sensor
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Thursday, November 14th, 2019 AT 12:27 PM
Tiny
JONES3RD
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This is what came with the starter sorry that's only copy I lost original paperwork
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Thursday, November 14th, 2019 AT 12:28 PM
Tiny
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Got it.

Again, the crank sensor will not damage it either. As they stated if it is installed wrong, it will change the timing and that could, in turn, break the nose of the starter from kickback.

Roy
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Thursday, November 14th, 2019 AT 12:34 PM

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