Another P1688 code question
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6th Gear
Joined: Nov 2003
Posts: 2,349
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From: Concord, California
Another P1688 code question
I went to test a '03 MCS with my son today.
During the test diive it threw a code. It is showing a CES code and I just happened to have my reader with me...
P1688.
It wasn't showing as we started the test, and the first time we reved the car at about 4500 rpm it stumbled and went into slow / maybe limp mode and the Power Stering also stopped working.
I reset the code and after a bit (we were ready to leave) the car not only seemed to start OK but the PS was also again working.
So we took another test drive and again at 4500 rpm it stumbled and again had a code of P1688
AND again the PS didn't work
As many have done I changed my bypass valve when I had a 1688 code and all was good... and it looks like almost ALL others with that code have been fixed with a new valve or even fixing IC BOOT issues.
Does limp mode shut off the PS ???
If so this may still be an option to buy with a known fix.
Any input greatly apreciated.
During the test diive it threw a code. It is showing a CES code and I just happened to have my reader with me...
P1688.
It wasn't showing as we started the test, and the first time we reved the car at about 4500 rpm it stumbled and went into slow / maybe limp mode and the Power Stering also stopped working.
I reset the code and after a bit (we were ready to leave) the car not only seemed to start OK but the PS was also again working.
So we took another test drive and again at 4500 rpm it stumbled and again had a code of P1688
AND again the PS didn't work
As many have done I changed my bypass valve when I had a 1688 code and all was good... and it looks like almost ALL others with that code have been fixed with a new valve or even fixing IC BOOT issues.
Does limp mode shut off the PS ???
If so this may still be an option to buy with a known fix.
Any input greatly apreciated.
5th Gear
Joined: Feb 2005
Posts: 913
Likes: 0
I went to test a '03 MCS with my son today.
During the test dive it threw a code. It is showing a CES code and I just happened to have my reader with me...
P1688.
It wasn't showing as we started the test, and the first time we reved the car at about 4500 rpm it stumbled and went into slow / maybe limp mode and the Power Stering also stopped working.
I reset the code and after a bit (we were ready to leave) the car not only seemed to start OK but the PS was also again working.
So we took another test drive and again at 4500 rpm it stumbled and again had a code of P1688
AND again the PS didn't work
As many have done I changed my bypass valve when I had a 1688 code and all was good... and it looks like almost ALL others with that code have been fixed with a new valve or even fixing IC BOOT issues.
Does limp mode shut off the PS ???
If so this may still be an option to buy with a known fix.
Any input greatly apreciated.
During the test dive it threw a code. It is showing a CES code and I just happened to have my reader with me...
P1688.
It wasn't showing as we started the test, and the first time we reved the car at about 4500 rpm it stumbled and went into slow / maybe limp mode and the Power Stering also stopped working.
I reset the code and after a bit (we were ready to leave) the car not only seemed to start OK but the PS was also again working.
So we took another test drive and again at 4500 rpm it stumbled and again had a code of P1688
AND again the PS didn't work
As many have done I changed my bypass valve when I had a 1688 code and all was good... and it looks like almost ALL others with that code have been fixed with a new valve or even fixing IC BOOT issues.
Does limp mode shut off the PS ???
If so this may still be an option to buy with a known fix.
Any input greatly apreciated.
You can try zip tying the bypass vavle shut to stop that code and confirm the bypass valve as the fault. You may get a map sensor fault as a result, but don't worry about it.
I am in the area if you need help.
6th Gear
Joined: Sep 2004
Posts: 5,149
Likes: 0
The PS shouldn't shut off in limp mode. Probably unrelated. It is not uncomman for the the PS to shut off intermittantly before failure ( and work after a restart).
You can try zip tying the bypass vavle shut to stop that code and confirm the bypass valve as the fault. You may get a map sensor fault as a result, but don't worry about it.
I am in the area if you need help.
You can try zip tying the bypass vavle shut to stop that code and confirm the bypass valve as the fault. You may get a map sensor fault as a result, but don't worry about it.
I am in the area if you need help.
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