Help Appreciated - ASR Problems
Thread Starter
Intermediate
Joined: Sep 2007
Posts: 29
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From: Tyler Texas
Help Appreciated - ASR Problems
Just after a 1800 trouble free trip in my '96 LT1 during the last 9 days, I decided to perform some service while stopping over at my brother-in-laws before returning home. During this service I disconnected the battery as usual and when I reconnected it, both of the ASR lights came on and would not go out. Also, the idle is now almost 1500 rpm's and the car is almost undriveable due to surging and almost shutdown.
The brake fluid level is at the full mark and I ran the codes and got H64, H65 and H72 from module 9 and also got "throttle position sensor/switch A circuit low input" on my OBDII code reader. I cannot clear the ASR codes from the CIS and I do not have my FSM's with me so if someone would be good enough to provide some clues as to what my next steps might be until I can get back home where they are, it would be greatly appreciated.
As a side note, the A/C will not come on now and it has been working great during out trip so I don't know if this is connected to the ASR problem or a separate issue.
The brake fluid level is at the full mark and I ran the codes and got H64, H65 and H72 from module 9 and also got "throttle position sensor/switch A circuit low input" on my OBDII code reader. I cannot clear the ASR codes from the CIS and I do not have my FSM's with me so if someone would be good enough to provide some clues as to what my next steps might be until I can get back home where they are, it would be greatly appreciated.
As a side note, the A/C will not come on now and it has been working great during out trip so I don't know if this is connected to the ASR problem or a separate issue.
Le Mans Master
Joined: Mar 2001
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From: Life is just one big track event. Everything before and after is prep and warm-up and cool-down laps
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St. Jude Donor '12
What service did you perform??
Its usually the last thing you worked on.
Check all the connectors. Maybe the one at the master is loose.
Try disconnecting the battery again, turn on the lights, wait 30 min and reconnect the battery.
Its usually the last thing you worked on.
Check all the connectors. Maybe the one at the master is loose.
Try disconnecting the battery again, turn on the lights, wait 30 min and reconnect the battery.
Thread Starter
Intermediate
Joined: Sep 2007
Posts: 29
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From: Tyler Texas
I serviced the throttle body, MAF and changed the oil and air and oil filter. If someone could help me with the trouble codes I provided it would be very helpful. I understand the first is somehow connected to the TPS but I am not clear how.
Le Mans Master
Joined: Mar 2001
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From: Life is just one big track event. Everything before and after is prep and warm-up and cool-down laps
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Cruise-In IV Veteran
St. Jude Donor '12
unplug the TPS, then plug it back in.
By servicing the TB did you take it apart?
Could you have knocked the CTS wire loose from the water pump?
did you get the TB torqued down?
did you get the air filter housing all sealed up?
I garuntee its something simple - or something just decided it was time to die.
I once had a bunch of codes, I thought I double checked everything and gave up and took it to a mechanic - he found a loose connection to the tps
By servicing the TB did you take it apart?
Could you have knocked the CTS wire loose from the water pump?
did you get the TB torqued down?
did you get the air filter housing all sealed up?
I garuntee its something simple - or something just decided it was time to die.
I once had a bunch of codes, I thought I double checked everything and gave up and took it to a mechanic - he found a loose connection to the tps
Thread Starter
Intermediate
Joined: Sep 2007
Posts: 29
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From: Tyler Texas
I have checked the TPS plug and wiring several times and have found nothing wrong. I guess my next step will be to replace it. The temp sensor on the water pump was not involved and I have looked at that wiring but will check it again.
I removed the intake system to service the ducting and air cleaner. I did not spray the MAF or touch the screen or wiring. This is something I have done quite a few times since the car has just clocked 176K on the odometer and have never failed to get it all back together correctly. I thought I was just doing some simple "house cleaning" in an effort to keep thing under the hood as clean as possible and in good condition.
Does anyone know how to clear the "Service ASR" light and get the switch working again without going to the dealer? None of the codes seem to be related to this problem unless I am missing something.
I removed the intake system to service the ducting and air cleaner. I did not spray the MAF or touch the screen or wiring. This is something I have done quite a few times since the car has just clocked 176K on the odometer and have never failed to get it all back together correctly. I thought I was just doing some simple "house cleaning" in an effort to keep thing under the hood as clean as possible and in good condition.
Does anyone know how to clear the "Service ASR" light and get the switch working again without going to the dealer? None of the codes seem to be related to this problem unless I am missing something.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Make sure you follow the instructions for code pulling for your year 'vette.
http://www.corvettebuyers.com/c4vettes/codes.htm
Read this thread it gets into the "reset": http://forums.corvetteforum.com/c4-t...rvice-asr.html
Your codes are on page 10.....the "H" in your code you pulled stands for history = old stored code.
http://www.corvette-guru.com/uploads...CMCodePull.pdf
http://www.corvettebuyers.com/c4vettes/codes.htm
Read this thread it gets into the "reset": http://forums.corvetteforum.com/c4-t...rvice-asr.html
Your codes are on page 10.....the "H" in your code you pulled stands for history = old stored code.
http://www.corvette-guru.com/uploads...CMCodePull.pdf
Thread Starter
Intermediate
Joined: Sep 2007
Posts: 29
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From: Tyler Texas
Obviously I am still very mixed up with this process. I see 9.7 on my display and I get the "---" but the CIS display with the ASR messages never clears. On top of that I still have the very high idle. Am I doing this right?
I have checked and double checked for vacuum leaks and can't find any.
On my OBDII code reader I am still getting the P0122 error code for the throttle position sensor error. I have changed TPS, IAC and engine computer one at a time without resolving the issue. (I am now back to the original components without any improvement.)
I am no expert but might not be considered a novice either. Any suggestions at this point?
I have checked and double checked for vacuum leaks and can't find any.
On my OBDII code reader I am still getting the P0122 error code for the throttle position sensor error. I have changed TPS, IAC and engine computer one at a time without resolving the issue. (I am now back to the original components without any improvement.)
I am no expert but might not be considered a novice either. Any suggestions at this point?
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
When you get an error code, it does not necessarily mean that the sensor itself is bad, it means an out-of-range voltage is received by the ECM. So, just replacing the sensor itself does not always cure the problem. You need to use the code to refer to the diagnostic chart in the FSM for your '96. This is how the dealers' shops do it, they are not magicians.
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Thread Starter
Intermediate
Joined: Sep 2007
Posts: 29
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From: Tyler Texas
I hope that is what I have done. I have used the valuable information provided me but I am still having problems with two things.
1. High idle and surging during any driving.
2. Cannot clear the ASR messages on my information display.
I think I have followed the directions completely and have ended up with the correct clear/reset "---" display when I finiish but the error messages are still there.
I do not have my FSM's with me since I am not at home so I am somewhat at a disadvantage without them. The codes I received were history codes and do not appear to have any current problem displayed on anything but the OBDII code reader. When I clear that one and start the car again, it instantly reapears. I would like not to take this car to the dealer on Monday but it appears that may be my only option at this time.
I will continue to work to resolve these problems before then so any suggestions from anyone are appreciated.
1. High idle and surging during any driving.
2. Cannot clear the ASR messages on my information display.
I think I have followed the directions completely and have ended up with the correct clear/reset "---" display when I finiish but the error messages are still there.
I do not have my FSM's with me since I am not at home so I am somewhat at a disadvantage without them. The codes I received were history codes and do not appear to have any current problem displayed on anything but the OBDII code reader. When I clear that one and start the car again, it instantly reapears. I would like not to take this car to the dealer on Monday but it appears that may be my only option at this time.
I will continue to work to resolve these problems before then so any suggestions from anyone are appreciated.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Did you spray the crap out of the AC/pintle holes with TB cleaner when you did your maintenance? Just a guess, but I bet your IAC pintle, IAC connector / wiring has an issue.
Race Director
Joined: Jan 2002
Posts: 12,264
Likes: 88
From: O'Fallon Missouri
You are seeing 9.7 volts? If so, under 10 volts the car will start shutting down the ASR/ABS systems to try to keep running. Are you sure you reconnected the battery correctly?
Thread Starter
Intermediate
Joined: Sep 2007
Posts: 29
Likes: 1
From: Tyler Texas
The cleaning done was with my hands and clean dry rags. I didn't spray anything on the connections or the MAF. The entire engine area had a good deal of dust and small sand particles that I wanted off.
Again, I might have misunderstood but the 9.7 I saw one the speedometer display was from "module 9, subsection 7" I got by shorting pin 4 and 12 on the ALDL and not voltage unless I am mixed up on what I am supposed to be looking at. I also thought once I was in the 9.7 section of the code display, I could clear the ASR section codes indicated by the "---" display. The only ASR codes I have been aware of are all "history" codes.
It appears I am going to have to come up with a clean method of measuring TPS voltages without cutting any of my wires.
The battery has a full charge and will start on the first spin every time. Voltage is reading 12.8 volts with the key off and 14.1 volts running. The engine just will not drop the idle below 1800 rpm's and run smoothly.
Sometimes what you think was a good idea at the time turns out to be a very bad idea. I had a great running car that had no trouble codes after a long trip (I checked) and I turned it into a car I can't drive more than a few blocks.
Again, I might have misunderstood but the 9.7 I saw one the speedometer display was from "module 9, subsection 7" I got by shorting pin 4 and 12 on the ALDL and not voltage unless I am mixed up on what I am supposed to be looking at. I also thought once I was in the 9.7 section of the code display, I could clear the ASR section codes indicated by the "---" display. The only ASR codes I have been aware of are all "history" codes.
It appears I am going to have to come up with a clean method of measuring TPS voltages without cutting any of my wires.
The battery has a full charge and will start on the first spin every time. Voltage is reading 12.8 volts with the key off and 14.1 volts running. The engine just will not drop the idle below 1800 rpm's and run smoothly.
Sometimes what you think was a good idea at the time turns out to be a very bad idea. I had a great running car that had no trouble codes after a long trip (I checked) and I turned it into a car I can't drive more than a few blocks.
