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'01 9C1 no crank

 
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kthelen
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2001 Chevrolet Impala


PostPosted: Wed Nov 20, 2013 10:31 pm    Post subject:  '01 9C1 no crank Reply with quote

Hello all!

Just picked up a 2001 Impala (9C1) that was DOA after a fuel line leak and subsequent fire atop the intake. Fortunately there was little damage; only the the fuel lines, fuel rail, spark plug wires, and a few other odds and ends were harmed.

The car had sat for better than a year in this state, so I also had to remove and charge the battery. It took a charge fine and passed a quick load test.

Having fixed all that, I made my first attempt to crank it. I received one key with the car, an obvious replacement (no rubber head).

Put the key in, turn to Run; fuel pump runs (yay, no leaks, holds pressure!) and DIC alternates between Battery and Security. Turn to Start, all lights go black except for the MIL - does not attempt to crank. Return to Run, DIC shows Battery only (no more Security). I can do this as many times as I want with the same result.

Tried the 10-minute Passkey relearn, no dice. Tried the 30-minute Passkey relearn, no luck there either.

Hooked up the scantool. PCM hadn't set any codes, but the BCM sure had (total of 9 history codes). There were several regarding the door locks and DRLs, as well as a couple that seemed more relevant:

B2964 - Key-In Ignition Circuit High
U1016 - Loss of communication with PCM

From reading various things, it seems the two most likely culprits would be failure of the BCM and/or associated wiring, or that the car is in need of the famous Passkey resistor bypass. (I'm leaning towards the latter, but since this car isn't behaving quite the same as described elsewhere I'm not positive.)

Before I begin extracting the ignition switch, would anyone else be willing to weigh in on this?


--Keith
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Frank
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2001 Chevrolet Impala


PostPosted: Thu Nov 21, 2013 12:04 am    Post subject:   Reply with quote

Is the security light flashing several times before it switches to the battery light, or is it alternating steady between security and battery? Have you checked the crank relay and checked to see if the starter is getting power? If it is, you might just have a bad starter.

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2001 Galaxy Silver 9C1 w/ L67 and 4T65E-HD...and a few other mods. Wink
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kthelen
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2001 Chevrolet Impala


PostPosted: Thu Nov 21, 2013 12:21 am    Post subject:   Reply with quote

Frank wrote:
Is the security light flashing several times before it switches to the battery light, or is it alternating steady between security and battery?


Steadily alternating.

Frank wrote:
Have you checked the crank relay and checked to see if the starter is getting power? If it is, you might just have a bad starter.


Not yet. Will check that next.
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Frank
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2001 Chevrolet Impala


PostPosted: Thu Nov 21, 2013 12:34 am    Post subject:   Reply with quote

Since it's steady (and not flashing), it's probably not a passlock issue unless the battery has been dead for so long that you need to do the full 30 minute relearn.

I would make it a 33 minute relearn (3 x 11 mins each) just to be on the safe side. Wink

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2001 Galaxy Silver 9C1 w/ L67 and 4T65E-HD...and a few other mods. Wink
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kthelen
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2001 Chevrolet Impala


PostPosted: Thu Nov 21, 2013 12:51 am    Post subject:   Reply with quote

Just checked, and I do have power at the crank relay. Shame on me for assuming the worst, and skipping the obvious!

Onward now to the (most likely) straightforward fix. Thanks for the help!
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Frank
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PostPosted: Thu Nov 21, 2013 1:58 pm    Post subject:   Reply with quote

Burnout

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