ecm removal on 98 vette
Thread Starter
Advanced
Joined: Jan 2015
Posts: 76
Likes: 0
From: Conway South Carolina
ecm removal on 98 vette
I thought the dealer said bcm. when i got the car he said ecm needed to be replaced. I just need to know how to locate it, and properly remove it, i'm sending it to Klien Bottle computer in NY. Any help is appreciated.
Last edited by Scott Luttrell; Feb 1, 2015 at 08:10 AM. Reason: delete
Burning Brakes
Joined: Jun 2002
Posts: 1,222
Likes: 16
St. Jude Donor '04
Found these instructions on the web that will help out. Just click the link and it will take you to a pdf document.
C5 PCM REMOVAL
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
WHY,,,,,,,,,,,,,,,,, Does the Stealership say that you have a bad PCM???
What issues and or DTCs are you seeing??
Just trying to save you cash and time.
Bill
What issues and or DTCs are you seeing??
Just trying to save you cash and time.
Bill
Thread Starter
Advanced
Joined: Jan 2015
Posts: 76
Likes: 0
From: Conway South Carolina
ecm replacement
thanks, seeing service engine soon trac control and abs icons. left headlight adjuster **** spins and clicks after u turn off lights. I pulled the battery and saw rust. hopefully acid didn't hit it. dealer says it needs ecm to communicate. I'll get all the codes tomorrow. I got some today but they went by too fast. Klien Bottle computer says they will re build the ecm and send it back in a day. plug and play. Had a stroke in 2012. some days better than others but i'm not lettin this beat me. I'll keep at it till i get it. All the help is greatly appreciated. The thief that sold me the car knew the issues, gauge reads 1/4 tank and it's empty. I want to sell it but i ain't gonna do anybody like the rat puke bastard did me.Live and learn. Thanks again. I'll post what i get tomorrow.
Thread Starter
Advanced
Joined: Jan 2015
Posts: 76
Likes: 0
From: Conway South Carolina
ecm plug & play
Thanks i'm obviously new to all this. Thanks for all the help. I'll get it squared up one way or the other. I'll let u know.
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Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
You are not reading the DTCs correctly. Follow this procedure and you will have a long as you need to read them:
READING YOUR Engine Diagnostic Codes
The Diagnostic Display Mode is entered with the following procedure:
1) Turn on the ignition but don't start the engine.
NOTE! You can read the DTCs with the engine running and or driving down the road but it can distract you. BE careful! Some DTCs clear themselves when you turn the ignition OFF!
I always read my DTCs prior to turning OFF the ignition switch. If you have any messages on the DIC,, PRESS RESET until they are gone!
2) Press the RESET button to turn off any warning messages. (i.e. door open, trunk open ect.)
3) Press and hold OPTIONS
4) While holding OPTIONS, press FUEL four times within a 10-second period.
Initially, on-board diagnostics go into an Automatic Mode which shows diagnostic codes in a pre-set sequence: PCM - TCS - RTD - BCM - IPC - RADIO - HVAC - LDCM - RDCM - SCM - RFA. All codes will be displayed for each. ( i.e. PCM = 4 codes) If none are present in a given module, you will see No More Codes on the display.
There are two kinds of diagnostic codes, Current and History designated with a letter suffix, "C" or "H". A current C code indicates a malfunction is present and active in the module displaying data. A history code indicates a problem existed sometime in the last 40 or 50 ignition cycles. When not accompanied by a current code of the same number, it's potential evidence of a previous problem, now resolved, that was not removed by clearing the codes.
More likely it's an indication of an intermittent malfunction.
Intermittent codes are the most challenging of the diagnostics. An intermittent code may have happened once, may have happened more than once but is inconsistent or may be happening on a regular basis but not at the time the codes are displayed. History codes can also be caused by a current malfunction in a system that is not operating at the time codes are displayed. An example is the rear window defogger which doesn't operate until the Body Control Module detects engine rpm. For history codes set by a module that does not operate with the key on and engine off, a special diagnostic tool called a Scan Tester is necessary to properly diagnose the malfunction.
Once the system has displayed all modules, it goes into the manual mode which allows selection of each module using combinations of Driver Information Center buttons. Manual mode can also be entered during the automatic sequence by pressing any button except English/Metric (E/M). Once the display shows Manual Diagnostics, select a module by pressing the OPTIONS button to go forward or the TRIP button to go back. Once a module is selected, a code is displayed, and if more than one are present; press GAGES to go forward or FUEL to go back.
To exit the diagnostic mode at any time, press E/M. If you want to erase codes in a given module, press and hold the RESET button To reset the codes once in manual mode, press and hold RESET until it displays NO CODES Press OPTIONS to go to the next module. Repeat the steps until you have reset the codes in all the computer modules.
NOTE!! Only reset the codes IF you want to - it is NOT necessary to do this. Clearing a code does not repair a problem. You are simply erasing the evidence of it in the module's memory. If you clear the code/s, and extinguish the Check Engine Light, your emissions status ready will NOT allow you to pass an emissions test until you have completed the required driving cycles.
Once you have the codes, the next question is: What to do with the information?
First, consult the factory service manual. Any serious C5 Do-It-Yourself owner should invest in the Corvette Service Manual of the appropriate model year. The Service Manual is really a requirement if you want to understand and work on your C5. You can GOOGLE the DTC and also find information on it.
Here is very good site that explains the DTCs:
http://www.corvette-web-central.com/C5DTCcode.html
http://www.obd-codes.com/trouble_cod...d-ii-codes.php
Make sure to include the H or C suffix!!
The headlight issue is seperate from the PCM Comms issue.. It has a stripped plastic driven gear that needs to be replaced.
Once you have read and jot down the codes, CLEAR ALL OF THEM and then see what DTCs come back after a short drive.
Bill
Those will be the important ones.
READING YOUR Engine Diagnostic Codes
The Diagnostic Display Mode is entered with the following procedure:
1) Turn on the ignition but don't start the engine.
NOTE! You can read the DTCs with the engine running and or driving down the road but it can distract you. BE careful! Some DTCs clear themselves when you turn the ignition OFF!
I always read my DTCs prior to turning OFF the ignition switch. If you have any messages on the DIC,, PRESS RESET until they are gone!
2) Press the RESET button to turn off any warning messages. (i.e. door open, trunk open ect.)
3) Press and hold OPTIONS
4) While holding OPTIONS, press FUEL four times within a 10-second period.
Initially, on-board diagnostics go into an Automatic Mode which shows diagnostic codes in a pre-set sequence: PCM - TCS - RTD - BCM - IPC - RADIO - HVAC - LDCM - RDCM - SCM - RFA. All codes will be displayed for each. ( i.e. PCM = 4 codes) If none are present in a given module, you will see No More Codes on the display.
There are two kinds of diagnostic codes, Current and History designated with a letter suffix, "C" or "H". A current C code indicates a malfunction is present and active in the module displaying data. A history code indicates a problem existed sometime in the last 40 or 50 ignition cycles. When not accompanied by a current code of the same number, it's potential evidence of a previous problem, now resolved, that was not removed by clearing the codes.
More likely it's an indication of an intermittent malfunction.
Intermittent codes are the most challenging of the diagnostics. An intermittent code may have happened once, may have happened more than once but is inconsistent or may be happening on a regular basis but not at the time the codes are displayed. History codes can also be caused by a current malfunction in a system that is not operating at the time codes are displayed. An example is the rear window defogger which doesn't operate until the Body Control Module detects engine rpm. For history codes set by a module that does not operate with the key on and engine off, a special diagnostic tool called a Scan Tester is necessary to properly diagnose the malfunction.
Once the system has displayed all modules, it goes into the manual mode which allows selection of each module using combinations of Driver Information Center buttons. Manual mode can also be entered during the automatic sequence by pressing any button except English/Metric (E/M). Once the display shows Manual Diagnostics, select a module by pressing the OPTIONS button to go forward or the TRIP button to go back. Once a module is selected, a code is displayed, and if more than one are present; press GAGES to go forward or FUEL to go back.
To exit the diagnostic mode at any time, press E/M. If you want to erase codes in a given module, press and hold the RESET button To reset the codes once in manual mode, press and hold RESET until it displays NO CODES Press OPTIONS to go to the next module. Repeat the steps until you have reset the codes in all the computer modules.
NOTE!! Only reset the codes IF you want to - it is NOT necessary to do this. Clearing a code does not repair a problem. You are simply erasing the evidence of it in the module's memory. If you clear the code/s, and extinguish the Check Engine Light, your emissions status ready will NOT allow you to pass an emissions test until you have completed the required driving cycles.
Once you have the codes, the next question is: What to do with the information?
First, consult the factory service manual. Any serious C5 Do-It-Yourself owner should invest in the Corvette Service Manual of the appropriate model year. The Service Manual is really a requirement if you want to understand and work on your C5. You can GOOGLE the DTC and also find information on it.
Here is very good site that explains the DTCs:
http://www.corvette-web-central.com/C5DTCcode.html
http://www.obd-codes.com/trouble_cod...d-ii-codes.php
Make sure to include the H or C suffix!!
The headlight issue is seperate from the PCM Comms issue.. It has a stripped plastic driven gear that needs to be replaced.
Once you have read and jot down the codes, CLEAR ALL OF THEM and then see what DTCs come back after a short drive.
Bill
Those will be the important ones.
Thread Starter
Advanced
Joined: Jan 2015
Posts: 76
Likes: 0
From: Conway South Carolina
codes from 98
You are not reading the DTCs correctly. Follow this procedure and you will have a long as you need to read them:
READING YOUR Engine Diagnostic Codes
The Diagnostic Display Mode is entered with the following procedure:
1) Turn on the ignition but don't start the engine.
NOTE! You can read the DTCs with the engine running and or driving down the road but it can distract you. BE careful! Some DTCs clear themselves when you turn the ignition OFF!
I always read my DTCs prior to turning OFF the ignition switch. If you have any messages on the DIC,, PRESS RESET until they are gone!
2) Press the RESET button to turn off any warning messages. (i.e. door open, trunk open ect.)
3) Press and hold OPTIONS
4) While holding OPTIONS, press FUEL four times within a 10-second period.
Initially, on-board diagnostics go into an Automatic Mode which shows diagnostic codes in a pre-set sequence: PCM - TCS - RTD - BCM - IPC - RADIO - HVAC - LDCM - RDCM - SCM - RFA. All codes will be displayed for each. ( i.e. PCM = 4 codes) If none are present in a given module, you will see No More Codes on the display.
There are two kinds of diagnostic codes, Current and History designated with a letter suffix, "C" or "H". A current C code indicates a malfunction is present and active in the module displaying data. A history code indicates a problem existed sometime in the last 40 or 50 ignition cycles. When not accompanied by a current code of the same number, it's potential evidence of a previous problem, now resolved, that was not removed by clearing the codes.
More likely it's an indication of an intermittent malfunction.
Intermittent codes are the most challenging of the diagnostics. An intermittent code may have happened once, may have happened more than once but is inconsistent or may be happening on a regular basis but not at the time the codes are displayed. History codes can also be caused by a current malfunction in a system that is not operating at the time codes are displayed. An example is the rear window defogger which doesn't operate until the Body Control Module detects engine rpm. For history codes set by a module that does not operate with the key on and engine off, a special diagnostic tool called a Scan Tester is necessary to properly diagnose the malfunction.
Once the system has displayed all modules, it goes into the manual mode which allows selection of each module using combinations of Driver Information Center buttons. Manual mode can also be entered during the automatic sequence by pressing any button except English/Metric (E/M). Once the display shows Manual Diagnostics, select a module by pressing the OPTIONS button to go forward or the TRIP button to go back. Once a module is selected, a code is displayed, and if more than one are present; press GAGES to go forward or FUEL to go back.
To exit the diagnostic mode at any time, press E/M. If you want to erase codes in a given module, press and hold the RESET button To reset the codes once in manual mode, press and hold RESET until it displays NO CODES Press OPTIONS to go to the next module. Repeat the steps until you have reset the codes in all the computer modules.
NOTE!! Only reset the codes IF you want to - it is NOT necessary to do this. Clearing a code does not repair a problem. You are simply erasing the evidence of it in the module's memory. If you clear the code/s, and extinguish the Check Engine Light, your emissions status ready will NOT allow you to pass an emissions test until you have completed the required driving cycles.
Once you have the codes, the next question is: What to do with the information?
First, consult the factory service manual. Any serious C5 Do-It-Yourself owner should invest in the Corvette Service Manual of the appropriate model year. The Service Manual is really a requirement if you want to understand and work on your C5. You can GOOGLE the DTC and also find information on it.
Here is very good site that explains the DTCs:
http://www.corvette-web-central.com/C5DTCcode.html
http://www.obd-codes.com/trouble_cod...d-ii-codes.php
Make sure to include the H or C suffix!!
The headlight issue is seperate from the PCM Comms issue.. It has a stripped plastic driven gear that needs to be replaced.
Once you have read and jot down the codes, CLEAR ALL OF THEM and then see what DTCs come back after a short drive.
Bill
Those will be the important ones.
READING YOUR Engine Diagnostic Codes
The Diagnostic Display Mode is entered with the following procedure:
1) Turn on the ignition but don't start the engine.
NOTE! You can read the DTCs with the engine running and or driving down the road but it can distract you. BE careful! Some DTCs clear themselves when you turn the ignition OFF!
I always read my DTCs prior to turning OFF the ignition switch. If you have any messages on the DIC,, PRESS RESET until they are gone!
2) Press the RESET button to turn off any warning messages. (i.e. door open, trunk open ect.)
3) Press and hold OPTIONS
4) While holding OPTIONS, press FUEL four times within a 10-second period.
Initially, on-board diagnostics go into an Automatic Mode which shows diagnostic codes in a pre-set sequence: PCM - TCS - RTD - BCM - IPC - RADIO - HVAC - LDCM - RDCM - SCM - RFA. All codes will be displayed for each. ( i.e. PCM = 4 codes) If none are present in a given module, you will see No More Codes on the display.
There are two kinds of diagnostic codes, Current and History designated with a letter suffix, "C" or "H". A current C code indicates a malfunction is present and active in the module displaying data. A history code indicates a problem existed sometime in the last 40 or 50 ignition cycles. When not accompanied by a current code of the same number, it's potential evidence of a previous problem, now resolved, that was not removed by clearing the codes.
More likely it's an indication of an intermittent malfunction.
Intermittent codes are the most challenging of the diagnostics. An intermittent code may have happened once, may have happened more than once but is inconsistent or may be happening on a regular basis but not at the time the codes are displayed. History codes can also be caused by a current malfunction in a system that is not operating at the time codes are displayed. An example is the rear window defogger which doesn't operate until the Body Control Module detects engine rpm. For history codes set by a module that does not operate with the key on and engine off, a special diagnostic tool called a Scan Tester is necessary to properly diagnose the malfunction.
Once the system has displayed all modules, it goes into the manual mode which allows selection of each module using combinations of Driver Information Center buttons. Manual mode can also be entered during the automatic sequence by pressing any button except English/Metric (E/M). Once the display shows Manual Diagnostics, select a module by pressing the OPTIONS button to go forward or the TRIP button to go back. Once a module is selected, a code is displayed, and if more than one are present; press GAGES to go forward or FUEL to go back.
To exit the diagnostic mode at any time, press E/M. If you want to erase codes in a given module, press and hold the RESET button To reset the codes once in manual mode, press and hold RESET until it displays NO CODES Press OPTIONS to go to the next module. Repeat the steps until you have reset the codes in all the computer modules.
NOTE!! Only reset the codes IF you want to - it is NOT necessary to do this. Clearing a code does not repair a problem. You are simply erasing the evidence of it in the module's memory. If you clear the code/s, and extinguish the Check Engine Light, your emissions status ready will NOT allow you to pass an emissions test until you have completed the required driving cycles.
Once you have the codes, the next question is: What to do with the information?
First, consult the factory service manual. Any serious C5 Do-It-Yourself owner should invest in the Corvette Service Manual of the appropriate model year. The Service Manual is really a requirement if you want to understand and work on your C5. You can GOOGLE the DTC and also find information on it.
Here is very good site that explains the DTCs:
http://www.corvette-web-central.com/C5DTCcode.html
http://www.obd-codes.com/trouble_cod...d-ii-codes.php
Make sure to include the H or C suffix!!
The headlight issue is seperate from the PCM Comms issue.. It has a stripped plastic driven gear that needs to be replaced.
Once you have read and jot down the codes, CLEAR ALL OF THEM and then see what DTCs come back after a short drive.
Bill
Those will be the important ones.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
TCS NO COMMS == Check ALL the TCS fuses! Check the TWO test points on TOP of each fuse with a Volt Meter to chassis ground (Ignition ON) and make sure that you have full battery on each test point.
Is your EBTCM front OR rear mounted???? Either way, you need to check the ground wire and make sure that its properly grounded and the ground point isnt compromised/corroded/loose etc...
NO COMMS means:
- You dont have all the power going to or out of the module.
OR
-Your module isnt functioning
OR
-The serial communication wire is damaged/not communicating..
This is a picture of a rear differential mounted EBTCM:
If you have a front mount,it will be here:
Is your EBTCM front OR rear mounted???? Either way, you need to check the ground wire and make sure that its properly grounded and the ground point isnt compromised/corroded/loose etc...
NO COMMS means:
- You dont have all the power going to or out of the module.
OR
-Your module isnt functioning
OR
-The serial communication wire is damaged/not communicating..
This is a picture of a rear differential mounted EBTCM:
If you have a front mount,it will be here:
Thread Starter
Advanced
Joined: Jan 2015
Posts: 76
Likes: 0
From: Conway South Carolina
98 codes fix
100% with Bill on the TCS No COMM issue.But I want to ask whether or not you cleared ALL the codes and then took the car for a ride??? It is unclear from your post if you did the clear.....
If you DID clear ALL codes and the LDCM and RDCM codes you listed came back then I suggest that you have a battery related issue going on that COULD be contributing to your symptoms. The battery is either low or the battery cables may not be tight or the battery cables may be corroded.
Have the battery tested and insure it is FULLY charged. The car will start with low voltage at the battery but the C5 electronics will NOT be happy.
Last edited by Scott Luttrell; Jan 9, 2015 at 05:29 PM. Reason: more to add regarding the issue.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
When the FOBs just stop functioning just try to RE-SYNC them
Press & HOLD the LOCK & UNLOCK buttons until you hear the horn TOOT. That should take care of that.
Bill
Press & HOLD the LOCK & UNLOCK buttons until you hear the horn TOOT. That should take care of that.
Bill
Thread Starter
Advanced
Joined: Jan 2015
Posts: 76
Likes: 0
From: Conway South Carolina
soting out 98 vette
I pulled all the codes again and drove the car and cleared them . only 2 codes came back : TCS No comm. and BORFA C2105 H C
can u give me the instruction on replacing the gear in headlight motor? The fob stopped working. I pulled the battery to check for previous leaks. put it back and my key fob doesn't work. there is no owners manual ,so if u can help with that i'd appreciate it. Thank you so much!! You guys are Badd ****. Sorry for the repeat wasn't sure it took
can u give me the instruction on replacing the gear in headlight motor? The fob stopped working. I pulled the battery to check for previous leaks. put it back and my key fob doesn't work. there is no owners manual ,so if u can help with that i'd appreciate it. Thank you so much!! You guys are Badd ****. Sorry for the repeat wasn't sure it took
Last edited by Scott Luttrell; Jan 9, 2015 at 05:40 PM. Reason: repeat !
Thread Starter
Advanced
Joined: Jan 2015
Posts: 76
Likes: 0
From: Conway South Carolina
EBTCM check
TCS NO COMMS == Check ALL the TCS fuses! Check the TWO test points on TOP of each fuse with a Volt Meter to chassis ground (Ignition ON) and make sure that you have full battery on each test point.
Is your EBTCM front OR rear mounted???? Either way, you need to check the ground wire and make sure that its properly grounded and the ground point isnt compromised/corroded/loose etc...
NO COMMS means:
- You dont have all the power going to or out of the module.
OR
-Your module isnt functioning
OR
-The serial communication wire is damaged/not communicating..
This is a picture of a rear differential mounted EBTCM:
If you have a front mount,it will be here:
Is your EBTCM front OR rear mounted???? Either way, you need to check the ground wire and make sure that its properly grounded and the ground point isnt compromised/corroded/loose etc...
NO COMMS means:
- You dont have all the power going to or out of the module.
OR
-Your module isnt functioning
OR
-The serial communication wire is damaged/not communicating..
This is a picture of a rear differential mounted EBTCM:
If you have a front mount,it will be here:
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
You can download a free OM copy here. There are many sites on the internet that have free downloads,
http://carburetor-manual.com/1998-ch...ad-p-1692.html
http://carburetor-manual.com/1998-ch...ad-p-1692.html
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
I looked at my info for 1998. There are 2 grounds for the rear mounted EBCM. G402 is the main ground and G401 is just for the motor. As far as the serial bus connection to the EBCM it is a Light Blue wire that goes to connector pin 10. There is also another same color wire the goes to it for the brake switch input. It is slightly larger.
Am using an electronic version which I HATE. I can't find the actual connector pin out to help. Will keep looking.
G401 left rear outer frame
G402 right rear inner frame
PS: EBCM ground wire is Black/White and motor is Black.
Am using an electronic version which I HATE. I can't find the actual connector pin out to help. Will keep looking.
G401 left rear outer frame
G402 right rear inner frame
PS: EBCM ground wire is Black/White and motor is Black.
Last edited by dadaroo; Jan 12, 2015 at 08:10 AM.