DTC 43 - What is it?
Thread Starter
Le Mans Master
Joined: Jan 2000
Posts: 6,595
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From: Thornton CO
DTC 43 - What is it?
My check engine light came on so I hooked up datamaster and it is coming up with a "DTC 43 - ESC Fail". Can anyone help me out with this?
95 Corvette A4 with a 383
Thanks!
95 Corvette A4 with a 383
Thanks!
Team Owner
Joined: Apr 2001
Posts: 22,267
Likes: 3
From: Dallas TX
Re: DTC 43 - What is it? (Timmy!)
Hate to tell you this.. but if I remember right.. ESC stands for Electronic Spark Control ... aka Opti. :( Course I'm a little buzzed right now after an "end of finals week" drinking benge .. so I may not be right :jester
Thread Starter
Le Mans Master
Joined: Jan 2000
Posts: 6,595
Likes: 1
From: Thornton CO
Re: DTC 43 - What is it? (Timmy!)
Someone found this for me:
CODE 43
Trouble Code 43 indicates that there may be a malfunction in the Electronic Spark Control (ESC) circuit. ESC is used to sense spark knock (pinging) and retard the timing to eliminate it. A knock sensor (located at the rear of the engine block) sends signals to an ESC module which then signals the ECM that knocking is being detected. The ECM will retard the timing by as much as 20 degrees in 1 degree increments. A loss of knock sensor signal or loss of ground at the ESC module will cause the signal at the ECM to remain high. The ECM will act as if no knock is present, and may possibly result in engine damage, if there is detonation. Loss of the ESC signal to the ECM will cause the ECM to constantly retard the timing to its maximum. This results in sluggish performance and a Code 43. The conditions for setting this code are:
* Engine is running
* ESC input signal has been low more than 2.23 seconds
Typical causes for this code include:
1) Open or shorted knock sensor
2) Loose knock sensor
3) Excessive mechanical noise within engine
4) Improper or incorrectly installed PROM or CALPACK in the ECM or defective ECM
5) Intermittent open in the EST line to the ignition module
CODE 43
Trouble Code 43 indicates that there may be a malfunction in the Electronic Spark Control (ESC) circuit. ESC is used to sense spark knock (pinging) and retard the timing to eliminate it. A knock sensor (located at the rear of the engine block) sends signals to an ESC module which then signals the ECM that knocking is being detected. The ECM will retard the timing by as much as 20 degrees in 1 degree increments. A loss of knock sensor signal or loss of ground at the ESC module will cause the signal at the ECM to remain high. The ECM will act as if no knock is present, and may possibly result in engine damage, if there is detonation. Loss of the ESC signal to the ECM will cause the ECM to constantly retard the timing to its maximum. This results in sluggish performance and a Code 43. The conditions for setting this code are:
* Engine is running
* ESC input signal has been low more than 2.23 seconds
Typical causes for this code include:
1) Open or shorted knock sensor
2) Loose knock sensor
3) Excessive mechanical noise within engine
4) Improper or incorrectly installed PROM or CALPACK in the ECM or defective ECM
5) Intermittent open in the EST line to the ignition module
Team Owner
Joined: Apr 2001
Posts: 22,267
Likes: 3
From: Dallas TX
Re: DTC 43 - What is it? (Timmy!)
Ok, so I was half right :). Not bad for what I had to drink last night.
What i question is that it says it retards in 1 degree increments. I can show you proof that mine does it in tenth of a degree increments.
What i question is that it says it retards in 1 degree increments. I can show you proof that mine does it in tenth of a degree increments.
Thread Starter
Le Mans Master
Joined: Jan 2000
Posts: 6,595
Likes: 1
From: Thornton CO
Re: DTC 43 - What is it? (Glock'94)
Come to find out my brother found this on a Grand National board so it may not be entirely accurate. The code matches up with what I found on SpeedDemon Motorpsorts website though. I have my max retard set at 10 degrees already.
Think I can still drag race tonight?
Think I can still drag race tonight?
