2001 Z06 Electrical/Computer Problems

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Oct 30, 2011 | 05:59 PM

93droptop

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Heel & Toe

Joined: Apr 2004

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From: Chula Vista CA

2001 Z06 Electrical/Computer Problems

My 01 Z06, 38,000 miles, started having electrical issues a couple months ago. Started out with the dash lights and parking lights blinking. The DIC showed numerous codes, low power mode was triggered among other faults. Based on a number of posts on this site (thanks Bill Curlee and Lucky) I've cleaned the ground contacts and the electrical connectors at both doors. The blinking has stopped and all codes except one are gone.

The last symptom that I cannot get rid of is that it takes about 2 minutes for the DIC to come to life and allow the car to start. I'm still getting a RFA U1064 code. The car will start and run fine if I allow the two minutes for the DIC to come to life. Any advise would be appreciated.

Oct 30, 2011 | 06:14 PM

Bill Curlee

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Joined: Dec 1999

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From: Anthony TX

CI 6,7,8,9,11 Vet

St. Jude Donor '08

If it were me,, I would read this POST and clean your ignition switch. If nothing else,, use it to figure out how to read the HOT in RUN & START fuses for the IPC.

-C5 ignition Switch repair - http://forums.corvetteforum.com/c5-t...ch-repair.html

I bet you will find that when the DIC does not come on,, the HOT in RUN & START voltage on those fuses is LOW due to a dirty contact inside the IGNITION SWITCH.

Give that theory a shot. Let me know what you find. If that isn't it,, I have some other stuff for you to look at!

Nov 6, 2011 | 09:46 PM

93droptop

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Heel & Toe

Joined: Apr 2004

Posts: 18

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From: Chula Vista CA

Bill, I checked the voltage at the fuses you suggested both in the failure mode (i.e. the 2 minutes or so before the DIC comes on) and then again after the DIC powered up and the engine could be started.

Under Hood Fuse Center

ENG ING1 Fuse #19 0.00/11.94

INJR 2 Fuse #18 0.00/11.93
ThrotCont Fuse #17 0.00/11.93
Injr 1 Fuse #22 0.00/11.90
PCM Fuse #16 2.25/12.20 (I ran the engine for a couple minutes to clear all the codes that accumulated when I pulled the prior fuses. Believe that is why non-failure mode voltage went up)
F/Pmp Fuse #13 1.18/12.20

Instrument Panel Fuse Block

BTSI BU #21 11.97/11.86
BCM 13 Fuse #22 11.97/11.86
IPC Fuse #19 2.85/11.94

It looks to me like the switch elements that feed Fuses #16, #13 and #19 are burnt resulting in low voltages to these circuits. Do you concur?

Thanks, RB

Nov 6, 2011 | 10:07 PM

Bill Curlee

Tech Contributor

Joined: Dec 1999

Posts: 32,910

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From: Anthony TX

CI 6,7,8,9,11 Vet

St. Jude Donor '08

HECK YES!

Nov 7, 2011 | 01:01 PM

dgrant3830

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Joined: Dec 2006

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From: Van Buren Arkansas

Wounded Warrior Escort '11

I agree with Bill. Those low voltages aren't going to run anything and those are important powered items.

Nov 12, 2011 | 08:26 PM

93droptop

Thread Starter

Heel & Toe

Joined: Apr 2004

Posts: 18

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From: Chula Vista CA

2001 Z06 Electrical/Computer Problems

Installed a new ignition switch this afternoon and all problems and codes are gone. Many thanks for the information and the advice.

Nov 14, 2011 | 09:23 AM

dgrant3830

Tech Contributor

Joined: Dec 2006

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From: Van Buren Arkansas

Wounded Warrior Escort '11

Cool. Bill is usually spot on the cause. Comes from lots of experience and doesn't shy away from digging into a repair.

Nov 14, 2011 | 01:46 PM

Bill Curlee

Tech Contributor

Joined: Dec 1999

Posts: 32,910

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From: Anthony TX

CI 6,7,8,9,11 Vet

St. Jude Donor '08

As our C5's AGE,, were going to see a LOT more wear issues in the electrical system...

This Ignition Switch problem is NOT going to go away... I see more and more problems IDENTICAL to this each week.

This is a pretty common failure. It just presents its self a little different in each case depending on how bad the contacts are and which contacts are hosed.

Glad to be able to help!