43. Low voltage at electronic spark timing circuit
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From: Winchester, VA
Car: 1991 Camaro RS/1989 Vert RS
Engine: 355/350
Transmission: T-5/T-5
Axle/Gears: BW9bolt3.45posi/3.23 Posi
43. Low voltage at electronic spark timing circuit
Whats this saying?
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Joined: Jan 2006
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From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Check the following:
Wiring and connections to ECM terminal L.
Wiring and connections from the ESC controller to the ECM.
Wiring and connections from the knock sensor to ESC controller.
Voltage at ECM A-B connector terminal B7 should be over 6 volts unless the system is sensing detonation.
If the above is OK you might have a faulty ESC sensor or module.
Happy Racing!
If People Drove Any Slower They’d Be Going BackwardsFog lights are not driving lights. Keep em turned off slow pokes.
How bout those dorks too scared to drive without headlights on in the daytime!
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Joined: Feb 2008
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Car: 90 IROC
Engine: 5.7 TPI
Transmission: 4L60
Axle/Gears: 3.23
Re: 43. Low voltage at electronic spark timing circuit
Something to do with the knock sensor. Is this code intermittent, or is it an all the time kinda thing?
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From: Winchester, VA
Car: 1991 Camaro RS/1989 Vert RS
Engine: 355/350
Transmission: T-5/T-5
Axle/Gears: BW9bolt3.45posi/3.23 Posi
Re: 43. Low voltage at electronic spark timing circuit
Happens at least everytime I drive and when it does happen it makes my car run HORRIBLE like very rich or lean, the temp goes up and I need to restart in order to reset it back to normal.
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Joined: Feb 2008
Posts: 1,004
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Car: 90 IROC
Engine: 5.7 TPI
Transmission: 4L60
Axle/Gears: 3.23
Re: 43. Low voltage at electronic spark timing circuit
Yeah, it causes the timing to be retarded by 15 degrees. Disconnect the knock sensor and measure the voltage between the harness connector and ground. It should be close to 5V. It must be less than 6V but greater than 4V. Connected to the sensor, you should measure about 2.5V between that junction and ground with the key on and engine not running. Next measure the voltage there with the engine warm and running. If it rises above 3.5V or drops below 1.5V for more than 1/2 second the ECM stores a code 43.
This makes it clear that a dead sensor or unplugged/shorted harness wire could do it.
This makes it clear that a dead sensor or unplugged/shorted harness wire could do it.
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