Gads this is fun to chase down and fix.
I can go for days with no error, and other times it can trip it over and over again dozens of times within a minute (have an android phone, Torque app and a blue tooth ELM327 adapter).
About half the time it cuts the A/C compressor off, about 1/4 the time it kills turbo boost (or perhaps it's retarding timing and dropping boost as a result). No pattern to this that I can find, yet.
Have noticed that there seems to be a heat aspect to it tripping this code. As in hotter weather generally makes it happen more. Sitting in heavy traffic also makes it happen more and repeat much more quickly. As in clear the code, trip the code. That fast, and over and over again. Once traffic clears and air flows, it tends to stop or slow down.
I have noticed it is most prevalent to tripping the code in the first 10-20 minutes of driving. After it's gone through this, it tends to trip the code far less. Though the A/C compressor has a habit of staying off, even after the code is cleared.
There also seems to be a relationship to violence, for lack of a better word. As in hard braking or hard throttle can sometimes produce the code at the same instant the event takes place.
Swapped the relay, no change. Opened and inspected relay, including cleaning contacts. Everything was and is fine, or at least appears to be.
Cleaned the grounds and all wiring connectors, as well inspected the wires. Everything was fine, and is now even more so. Tripped the code in 3 miles after I put it all back together.
I wish the WIS was clearer and more informative on this code and the wiring. Not just where the wires go, but the logic of what is triggering things and why.
Almost everything describes the P0687 code for a Saab as being a high voltage out of the relay. Which seems mighty weird as there is no source of high voltage available. Some other things I've read list the code as short to ground, which also seems highly unlikely.
But, I have read a few others that talk about failure to receive voltage, and holding voltage too long. That seems more plausable with a relay. Either heat soaking and failing to actuate or close, or sticking and failing to open. Hmm.
I may just buy a relay to try as a new relay. I don't expect anything from it and I hate to waste money.
Something I haven't done yet and don't really want to do is to open up the ECU to inspect it for solder fractures.
I don't have a Tech II reader (yet), but I wonder if that might reveal more details and help me chase this one down. It's not something I've seen mentioned in other threads regarding this and other similar OBD code problems.
I can go for days with no error, and other times it can trip it over and over again dozens of times within a minute (have an android phone, Torque app and a blue tooth ELM327 adapter).
About half the time it cuts the A/C compressor off, about 1/4 the time it kills turbo boost (or perhaps it's retarding timing and dropping boost as a result). No pattern to this that I can find, yet.
Have noticed that there seems to be a heat aspect to it tripping this code. As in hotter weather generally makes it happen more. Sitting in heavy traffic also makes it happen more and repeat much more quickly. As in clear the code, trip the code. That fast, and over and over again. Once traffic clears and air flows, it tends to stop or slow down.
I have noticed it is most prevalent to tripping the code in the first 10-20 minutes of driving. After it's gone through this, it tends to trip the code far less. Though the A/C compressor has a habit of staying off, even after the code is cleared.
There also seems to be a relationship to violence, for lack of a better word. As in hard braking or hard throttle can sometimes produce the code at the same instant the event takes place.
Swapped the relay, no change. Opened and inspected relay, including cleaning contacts. Everything was and is fine, or at least appears to be.
Cleaned the grounds and all wiring connectors, as well inspected the wires. Everything was fine, and is now even more so. Tripped the code in 3 miles after I put it all back together.
I wish the WIS was clearer and more informative on this code and the wiring. Not just where the wires go, but the logic of what is triggering things and why.
Almost everything describes the P0687 code for a Saab as being a high voltage out of the relay. Which seems mighty weird as there is no source of high voltage available. Some other things I've read list the code as short to ground, which also seems highly unlikely.
But, I have read a few others that talk about failure to receive voltage, and holding voltage too long. That seems more plausable with a relay. Either heat soaking and failing to actuate or close, or sticking and failing to open. Hmm.
I may just buy a relay to try as a new relay. I don't expect anything from it and I hate to waste money.
Something I haven't done yet and don't really want to do is to open up the ECU to inspect it for solder fractures.
I don't have a Tech II reader (yet), but I wonder if that might reveal more details and help me chase this one down. It's not something I've seen mentioned in other threads regarding this and other similar OBD code problems.
