another Failsafe mystery
#1
05-08-2018, 10:35 PM
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another Failsafe mystery
new battery, always on the battery tender nightly. Charging system typically puts out between 13.5 and 14.1 volts. I have a voltmeter plugged in to the cigarette lighter receptacle and obsessively check the voltage. Car runs great, 120,500 miles.
every 7-14 days, more or less, the car decides not to start in the morning. Failsafe message displayed. No faults shown on my Carsoft LR 1.0
I can run the hard reset procedure, and then the car starts up fine and runs like a champ.
Since the reset is so easy to do, and I can't get any faults to display on the code reader, I'm not really complaining, just curious what's going on.
Z
every 7-14 days, more or less, the car decides not to start in the morning. Failsafe message displayed. No faults shown on my Carsoft LR 1.0
I can run the hard reset procedure, and then the car starts up fine and runs like a champ.
Since the reset is so easy to do, and I can't get any faults to display on the code reader, I'm not really complaining, just curious what's going on.
Z
#3
05-10-2018, 01:48 PM
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#5
05-10-2018, 04:21 PM
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Attach your OBDII reader and check your codes if no codes then take your car for a run with your reader connected. Drive that way until you get the Failsafe then pull over and check your reader. My guess is that one of your knock sensors is throwing a temporary code that is not a hard fault.
#6
05-10-2018, 05:07 PM
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Attach your OBDII reader and check your codes if no codes then take your car for a run with your reader connected. Drive that way until you get the Failsafe then pull over and check your reader. My guess is that one of your knock sensors is throwing a temporary code that is not a hard fault.
As mentioned above, on those occasions when the message pops up, the car won't start until I run the hard reset procedure. After which, all seems normal.
Will report back the next time it happens and any new observations.
thank you.
Z
#7
05-11-2018, 01:16 AM
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#8
05-11-2018, 03:32 AM
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so far no evidence the the battery tender + is at fault. After a normal day of driving, the tender takes about 5 minutes low charging to arrive at the "float" or "maintain" function. Battery has been load tested and passed at 100%. Charging system appears to be completely normal.
I might quit using the tender for a month or two to see if that impacts the anomaly .
Z
I might quit using the tender for a month or two to see if that impacts the anomaly .
Z
#9
05-11-2018, 04:52 AM
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#10
05-11-2018, 02:02 PM
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I wish I could put the blame on the 3 month old battery and be done with this perplexing issue. But the battery, a top of the line NAPA battery, is showing no faults, none with load testing of current and not with voltage either. My 50 yrs experience in repair and restoration of classic motorcycles and classic cars may not translate to much in regards to modern vehicles, but battery testing is pretty much thee same as it's been for several decades. I'm confident the fault is lurking in some unknown sensor.
Even when the battery is somewhat depleted by numerous short trips / restarting over and over in one day, I'm having no problems. Only when the car has sat overnight, both on the tender, and off of the tender, then and only then do I get a FaulSafe warning and the subsequent no start, that is, no starting until a hard reset has been performed.
This anomaly is only happening once every 10-14 days, more or less. As mentioned, as long as I have a procedure to get the car going that's laughably easy, I'm not too concerned. Just curious, at this stage.
Z
#11
05-11-2018, 02:03 PM
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I wish I could put the blame on the 3 month old battery and be done with this perplexing issue. But the battery, a top of the line NAPA battery, is showing no faults, none with load testing of current and not with voltage either. My 50 yrs experience in repair and restoration of classic motorcycles and classic cars may not translate to much in regards to modern vehicles, but battery testing is pretty much thee same as it's been for several decades. I'm confident the fault is lurking in some unknown sensor.
Even when the battery is somewhat depleted by numerous short trips / restarting over and over in one day, I'm having no problems. Only when the car has sat overnight, both on the tender, and off of the tender, then and only then do I get a FaulSafe warning and the subsequent no start, that is, no starting until a hard reset has been performed.
This anomaly is only happening once every 10-14 days, more or less. As mentioned, as long as I have a procedure to get the car going that's laughably easy, I'm not too concerned. Just curious, at this stage.
Z
#12
05-11-2018, 02:35 PM
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zray (05-11-2018)
#13
05-11-2018, 03:19 PM
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sorry for the double posting, don't know what happened ??
I really appreciate your thinking on this, and you taking the time to post.
I'll keep the code reader in the glove box and hope to catch a fault showing up next time this gremlin surfaces.
Z
I really appreciate your thinking on this, and you taking the time to post.
I'll keep the code reader in the glove box and hope to catch a fault showing up next time this gremlin surfaces.
Z
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RJ237 (05-11-2018)
#14
05-11-2018, 07:48 PM
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Then have the OBDII attached to the car before you start it and see if it captures the code.
so far, I've only gotten the FailSafe message after the car has been sitting over night, never while driving, (knock on wood). And then only once every couple of weeks.
As mentioned above, on those occasions when the message pops up, the car won't start until I run the hard reset procedure. After which, all seems normal.
Will report back the next time it happens and any new observations.
thank you.
Z
As mentioned above, on those occasions when the message pops up, the car won't start until I run the hard reset procedure. After which, all seems normal.
Will report back the next time it happens and any new observations.
thank you.
Z
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