*** Error Codes 43 & 54 *** How do it get rid of them ??
Thread Starter
Drifting
Joined: Oct 2001
Posts: 1,439
Likes: 4
From: Kewaskum Wisconsin
*** Error Codes 43 & 54 *** How do it get rid of them ??
Original post in scan section. Thought that I would post it here too (more traffic)http://forums.corvetteforum.com/c4-s...d-of-them.html
I am some error code issues. The main one is code 43 (Low voltage at electronic spark timing circuit). I replaced the module in the distributor, but I still get the code 43.
I also get an occasional code 54 (Low voltage at fuel pump OR Low voltage at Fuel pump relay OR Output failure at quad driver module). This error code comes and goes.
The car is a 1985 vette with a 1990 f-body (7730) ecm and a custom chip.
I need some direction as to possible fixes for this.
Thanks in advance for any help!
I am some error code issues. The main one is code 43 (Low voltage at electronic spark timing circuit). I replaced the module in the distributor, but I still get the code 43.
I also get an occasional code 54 (Low voltage at fuel pump OR Low voltage at Fuel pump relay OR Output failure at quad driver module). This error code comes and goes.
The car is a 1985 vette with a 1990 f-body (7730) ecm and a custom chip.
I need some direction as to possible fixes for this.
Thanks in advance for any help!
Drifting
Joined: Oct 2004
Posts: 1,976
Likes: 0
From: Patchogue NY
Try taking off the custom chip, and see if that does the trick. It's a process of elimination. You may have a faulty fuel pump too. If you want to get rid of the code, you can take it to anyone who has a code reader, they will be able to turn off the code; if it comes back on. Houston you got a problem.
Joe B.
Joe B.
Thread Starter
Drifting
Joined: Oct 2001
Posts: 1,439
Likes: 4
From: Kewaskum Wisconsin
Try taking off the custom chip, and see if that does the trick. It's a process of elimination. You may have a faulty fuel pump too. If you want to get rid of the code, you can take it to anyone who has a code reader, they will be able to turn off the code; if it comes back on. Houston you got a problem.
Joe B.
Joe B.
Houston.....I already know I have a problem.....
thus, the post.Also known as a "paper clip"
Team Owner
Joined: Dec 2007
Posts: 20,974
Likes: 261
This might sound stupid, but a buddy of mine got a scanner device from a local parts store around here (auto zone) where they let him take it and he shut off codes on a car he sold my kid 4 years ago, it never came back on and still passes emissions after that.
Worth a try to call and see if their equipment can do yours. his car is OBD1
Worth a try to call and see if their equipment can do yours. his car is OBD1
Thread Starter
Drifting
Joined: Oct 2001
Posts: 1,439
Likes: 4
From: Kewaskum Wisconsin
This might sound stupid, but a buddy of mine got a scanner device from a local parts store around here (auto zone) where they let him take it and he shut off codes on a car he sold my kid 4 years ago, it never came back on and still passes emissions after that.
Worth a try to call and see if their equipment can do yours. his car is OBD1
Worth a try to call and see if their equipment can do yours. his car is OBD1
Instructor
Joined: Oct 2009
Posts: 202
Likes: 9
From: Tucson
I had both at the same time. Ugh. I fixed the 54 with a new fuel pump relay. It was really cheap at Autozone, and takes like 3 minutes to put in. I may have just got lucky but it worked like a charm.
The 43 I haven't fixed yet, so if you figure it out, let me know!
The 43 I haven't fixed yet, so if you figure it out, let me know!
Drifting
Joined: Feb 1999
Posts: 1,773
Likes: 33
From: Bradenton Florida
Dave for code 43...for the 85 ecm it it the esc ckt. Spark control You may have to trace you wires for the 90 ecm. Its been a long while.
How exactly did this start again??
I wiould have to dig to see if I still have the 90 ecm print outs.
I do have a the 85 gm manual if you are interested. Give me a PM. It is detailed. Way better than a hayes manual. It speciifc for hte 85 vette from GM. The cover is missing. Lost of use but the rest of the book is decent.
How exactly did this start again??
I wiould have to dig to see if I still have the 90 ecm print outs.
I do have a the 85 gm manual if you are interested. Give me a PM. It is detailed. Way better than a hayes manual. It speciifc for hte 85 vette from GM. The cover is missing. Lost of use but the rest of the book is decent.
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Thread Starter
Drifting
Joined: Oct 2001
Posts: 1,439
Likes: 4
From: Kewaskum Wisconsin
The MSD box took a dump (caused a no spark issue), so it was taken off. The hypertech coil in the cap is being used at this time. It ran fine with no codes and then out of nowhere, code 43 came to visit.
Heel & Toe
Joined: Feb 2008
Posts: 16
Likes: 3
From: GardenGrove CA
The knock sensor has an internal resistor connected from the output pin to the case (ground).
Resistor values vary with sensor part number. The values I am aware of are 3.9k, 8.2k, and 100k.
The ESC module has an equal value resistor connected from the sensor input to 5v.
You must use the correct knock sensor for the ESC module.
With equal value resistors, the quiescent output voltage of the knock sensor is 2.5v.
The knock signal is A.C. and goes above and below 2.5v.
If the sensor wire is broken, the ESC input would be 5v.
If the sensor wire is grounded, the ESC input would be 0v.
Resistor values vary with sensor part number. The values I am aware of are 3.9k, 8.2k, and 100k.
The ESC module has an equal value resistor connected from the sensor input to 5v.
You must use the correct knock sensor for the ESC module.
With equal value resistors, the quiescent output voltage of the knock sensor is 2.5v.
The knock signal is A.C. and goes above and below 2.5v.
If the sensor wire is broken, the ESC input would be 5v.
If the sensor wire is grounded, the ESC input would be 0v.
Instructor
Joined: Oct 2009
Posts: 202
Likes: 9
From: Tucson
I finally fixed my code 43. I said one day, screw it, the car is going on jackstands until the problem is fixed...
I got the car up, and pulled on the connector to unplug it and check the connector, and the wire pulled right out! Packrats got in and chewed the KS wire in half.
Anyhow, I just ran a new wire from the ESC module to the KS, and instant fix!
Moral of the story: check the wire from the ESC module to the KS first.
I got the car up, and pulled on the connector to unplug it and check the connector, and the wire pulled right out! Packrats got in and chewed the KS wire in half.
Anyhow, I just ran a new wire from the ESC module to the KS, and instant fix!
Moral of the story: check the wire from the ESC module to the KS first.
You should have the same attitude with your real account.
