Computer Control Module Problem ?
Thread Starter
6th Gear
Joined: Jan 2017
Posts: 6
Likes: 0
From: Sweetwater TX
Computer Control Module Problem ?
Yesterday I was checking the fluid level for the clutch on my 1991 C4. The vehicle was running and when I snapped the Computer Control Module back into place the care died and now it will not start. I am guessing it is a problem with the CCM, however I/m not sure. Any information would be a great help.
Team Owner
Joined: Sep 2003
Posts: 25,394
Likes: 2,741
Yesterday I was checking the fluid level for the clutch on my 1991 C4. The vehicle was running and when I snapped the Computer Control Module back into place the care died and now it will not start. I am guessing it is a problem with the CCM, however I/m not sure. Any information would be a great help.
You've undoubtedly either pulled a wire/terminal loose from one of the four connectors. Did you have any of the connectors actually removed to gain access or did you just lift and twist to get out of the way?
Thread Starter
6th Gear
Joined: Jan 2017
Posts: 6
Likes: 0
From: Sweetwater TX
Your terminology is flawed a little. That's actually the ECM (Engine Control Module) that you had to move to get to the master. Do you have a "crank and no start" OR do you have "no crank also"?
You've undoubtedly either pulled a wire/terminal loose from one of the four connectors. Did you have any of the connectors actually removed to gain access or did you just lift and twist to get out of the way?
You've undoubtedly either pulled a wire/terminal loose from one of the four connectors. Did you have any of the connectors actually removed to gain access or did you just lift and twist to get out of the way?
Last edited by d-law; Jan 9, 2017 at 01:04 PM.
Team Owner
Joined: Sep 2003
Posts: 25,394
Likes: 2,741
Do you have a SECURITY light in the cluster? FLASHING OR STEADY ON if you do? It was running when you put the ECM back into the tray?
Thread Starter
6th Gear
Joined: Jan 2017
Posts: 6
Likes: 0
From: Sweetwater TX
Team Owner
Joined: Sep 2003
Posts: 25,394
Likes: 2,741
I've never had a FE (Fuel Enable) problem but with what you mention I'd do these 2 things. 1. Do you hear the fuel pump run "momentarily" with KEY ON? 2. You might pick up a fuel pressure gauge rental from a local AZ. If you don't hear the pump or you don't get fuel pressure to the gauge with KEY ON or while CRANKING it might help pin point which wire/terminal is creating the issue.
I'm going to guess you don't have a FSM (Factory Service Manual). Do you?
Do you know how to use the fuel gauge connected to the fuel rail?
I'm going to guess you don't have a FSM (Factory Service Manual). Do you?
Do you know how to use the fuel gauge connected to the fuel rail?
Last edited by WVZR-1; Jan 9, 2017 at 01:36 PM.
Thread Starter
6th Gear
Joined: Jan 2017
Posts: 6
Likes: 0
From: Sweetwater TX
I've never had a FE (Fuel Enable) problem but with what you mention I'd do these 2 things. 1. Do you hear the fuel pump run "momentarily" with KEY ON? 2. You might pick up a fuel pressure gauge rental from a local AZ. If you don't hear the pump or you don't get fuel pressure to the gauge with KEY ON or while CRANKING it might help pin point which wire/terminal is creating the issue.
I'm going to guess you don't have a FSM (Factory Service Manual). Do you?
Do you know how to use the fuel gauge connected to the fuel rail?
I'm going to guess you don't have a FSM (Factory Service Manual). Do you?
Do you know how to use the fuel gauge connected to the fuel rail?
Last edited by d-law; Jan 9, 2017 at 01:43 PM.
Racer
Joined: Dec 2014
Posts: 402
Likes: 44
From: Pittsburgh PA
Just a hunch but I am wonder if you loosen the memcal prom chip inside when you snapped the module back in to it holding bracket. Lift the ECM our and turn the it over and remove the rectangle cover to check if the memcal chip is loose or unplugged. Like I said it's just a hunch.
Ken
Ken
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
6th Gear
Joined: Jan 2017
Posts: 6
Likes: 0
From: Sweetwater TX
Just a hunch but I am wonder if you loosen the memcal prom chip inside when you snapped the module back in to it holding bracket. Lift the ECM our and turn the it over and remove the rectangle cover to check if the memcal chip is loose or unplugged. Like I said it's just a hunch.
Ken
Ken
Team Owner
Joined: Sep 2003
Posts: 25,394
Likes: 2,741
Do the fuel pump "listen", the fuel gauge check with KEY ON and while CRANKING after checking the SECURITY light and noting it's state. Do you have maybe a CEL/SES in the DIC with KEY ON and it's done with the BULB CHECK?
Thread Starter
6th Gear
Joined: Jan 2017
Posts: 6
Likes: 0
From: Sweetwater TX
The PROM if installed correctly is quite secure. Now if someone has added a PROM that uses a "hang-on" it's maybe possible that it's the issue. I'd say unlikely. Lifting, twisting and turning while you were there I'd think the issue but you could do as suggested in a previous post. I wouldn't do it for a start.
Do the fuel pump "listen", the fuel gauge check with KEY ON and while CRANKING after checking the SECURITY light and noting it's state. Do you have maybe a CEL/SES in the DIC with KEY ON and it's done with the BULB CHECK?
Do the fuel pump "listen", the fuel gauge check with KEY ON and while CRANKING after checking the SECURITY light and noting it's state. Do you have maybe a CEL/SES in the DIC with KEY ON and it's done with the BULB CHECK?
Team Owner
Joined: Sep 2003
Posts: 25,394
Likes: 2,741
The reason I like the checks I mentioned first vs checking the PROM is that they could be considered "NON DESTRUCTIVE". Lifting. twisting and turning got you where you are, doing again if someone has already been in the connectors to the ECM might actually make it worse.
Read this and maybe check the CCM (Central Control Module) different location in the car and maybe you've actually set a CCM Code 54 that would indicate an FE problem. That might help if it was as to which pin to check at the ECM.
http://tech.corvettecentral.com/2011...trouble-codes/
Of course check all fuses paying attention to FP1, ECM and maybe the CCM fuses. Fuse box if you don't know is on the end of the dash after opening the right door.
Last edited by WVZR-1; Jan 9, 2017 at 02:48 PM.