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Electronic spark control failure - C1500 GMC Cars & Trucks

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  • Anonymous May 11, 2010

    More info Please



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Posted on Sep 28, 2009


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SOURCE: code 43 whitch is a

Knock sensor is the connection on the knock sensor,may have came off . Or better yet a new one maybe in order. Make sure there is no engine knock going on and by the way is this a truck if it is make sure the hitch is not rattling setting this code on

Posted on Apr 21, 2011

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My 1991 chevy s10 2.5l want crank it's getting red spark

Hi Austin:

Counting on my fingers I make that over 25 years old, so the maintenance history and mileage become very relevant.
I'd be considering an ignition tune-up as an appropriate first step.
Changing spark plugs, plug lead harness (wires), rotor, cap, coil, Points & condenser (or solid state components.
Chances are it will show a remarkable improvement.

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Have the charging system checked for proper operation. If battery is not being charged properly and goes weak the electronic control modules within the vehicle will start shutting down and cause all sorts of drivability issues

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Not sure on this one.....if it's "drive by wire" that means the accelerator pedal is connected to the intake electronically, and that may be where the A9 code comes from. Saturns are drive by wire and it's a common failure point for them. spark, compression and gas is all you need for the engine to run. you can put a fuel pressure gauge on the rail to determine fuel, assume that the compression is good, and pull a spark plug and ground it while cranking to see if gets a spark...

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92 chevy s10 code says esc module

What is electronic spark control (ESC)?

Electronic Spark Control

An additional electronic control (ESC) is used on vehicles equipped with
an LE9 engine. The Electronic Spark Control (ESC) system is a closed
loop system that controls engine detonation by modifying the spark
advance when detonation occurs. The amount of retard is a function of
the degree of detonation.


The (ESC) controller processes the sensor signal and applies it to the
distributor to adjust spark timing. The process is continuous so that
the presence of detonation is monitored and controlled. The controller
is a hard wired signal processor/amplifier which operates from 6 to 16
volts. The controller has no memory storage.


The (ESC) sensor is a piezoelectric device, mounted in the engine block
that detects the presence (or absence) and intensity of detonation by
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ESC Vacuum Switch

On LE9 engine equipped vehicles with automatic transmission a "tip in"
vacuum switch is used. Its function is to provide a momentary contact
closure (signal) to the ESC controller during a throttle "tip in"
condition which then briefly retards spark timing to minimize knock.
The switch contacts are normally open under steady engine vacuum
conditions including no vacuum, and all brief increasing vacuum
conditions. Basically the switch closes only during rapidly decreasing
vacuum conditions such as that encountered on rapid throttle operation.

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The engine and transmission in this cars drive train are fully electronically controlled by a computer called the PCM (Power Train Control Module). Whenever a problem like this occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant teperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL THE DIAGNOSIS & TESTING IS COMPLETED.

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1 Answer

Code 43 whitch is a electronic spark control failure

Knock sensor is the connection on the knock sensor,may have came off . Or better yet a new one maybe in order. Make sure there is no engine knock going on and by the way is this a truck if it is make sure the hitch is not rattling setting this code on

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1989 Chevy K1500, fires but won't start

removed the dis cap then try to rotate the belt thuse turning belt see if there is any slack when rotor turns if there is slack or even slight hesitation while turning u need a timing chain & gear

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