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12-26-2008, 10:47 PM
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Chevys Kick A$$
Join Date: Jan 2005
Location: Zootown, MT
Posts: 12,699
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Computer Code 43?
My buddies dads '90 Suburban is running bad and throwing out code #43 anyone know what it is or any good sites for codes? I talked to the auto parts store in town here they were not helpful at all surprise. Thanks in advance!!
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*HOODS is what I answer too* -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold  -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit  -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER  I would rather push a Chevy then drive a ford!!
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12-26-2008, 10:57 PM
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#2 |
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Countdown Survivor
Join Date: Aug 2007
Location: Bean Station, East Tennessee
Posts: 9,676
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Re: Computer Code 43?
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93 Yukon 89 Silverado Z71 SWB Sport 91 K 2500 Silverado "Lobuk-Worktruk" A MAN OF HONOR DOES NOT LIE, CHEAT, OR STEAL, NOR TOLERATE THOSE WHO DO. Gettin' old ain't for sissies. |
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12-26-2008, 10:59 PM
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#3 |
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Registered User
Join Date: Jun 2008
Location: newparis ohio
Posts: 201
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Re: Computer Code 43?
I agree
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12-27-2008, 10:27 AM
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#4 |
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Countdown Survivor
Join Date: Aug 2007
Location: Bean Station, East Tennessee
Posts: 9,676
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Re: Computer Code 43?
not to be picky, but shouldn't this be in the 88-98 forum?
__________________
93 Yukon 89 Silverado Z71 SWB Sport 91 K 2500 Silverado "Lobuk-Worktruk" A MAN OF HONOR DOES NOT LIE, CHEAT, OR STEAL, NOR TOLERATE THOSE WHO DO. Gettin' old ain't for sissies. |
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12-27-2008, 10:29 AM
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#5 |
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Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,621
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Re: Computer Code 43?
Code 43 can be the hardest code to find the cause of. My first suggestion is to pay attention to when the code gets set. When diagnosing it, it is very helpful to know if the code 43 is being set during the self test, or does it get set driving down the road on acceleration when the system is seeing a ping or something rattling on the engine.
Each time the Vehicle is started and certain criteria is met (coolant temp, MAP reading, engine RPM), a self test of the knock senor circuit is run. The ECM adds spark advance while anticipating a knock signal. If no knock signal is detected during the test a code 43 will be set. Some GM manuals state that two consecutive tests must fail for a code to set. (All GM electronic spark timing systems are not the same. Some systems use a separate module between the knock sensor and computer) Anything that prevents the knock/ping or prevents the system from detecting it will cause a code 43 to be set. A bad knock sensor, ECM failure, wiring, Timing way retarded or a very rich mixture can cause the code. What many manuals will not tell you is that a code 43 can be set by something loose rattling on or in the engine. Lifters, cam, rod, crank and piston noises all have the potential for causing false knock signals to be produced. The Knock sensor contains a piezoelectric crystal which causes a voltage to be produced. Loose components on or in the engine can cause the knock sensor to create a voltage and the system may interpret this as pinging. The system retards the timing because it determines it is pinging. Loose torque converter bolts can cause a false knock signal to be detected. Clear the 43 trouble code from the ECM memory. Make sure the key is OFF and removing the ECM fuses for tens seconds should clear the code. You could disconnect the battery to clear the code. Drive the vehicle and try to determine when it sets. Does the code set when you are just reaching T/Stat temp? When you drive it hard? When driving at freeway speeds? Accelerating up a long incline? Driving down bumpy roads? |
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