1994 pontiac trans am 350 lt1 6speed ALDL obd1


DTC 43 is "Knock Sensor (KS) circuit so im understanding that is the code 43 but ive also got a 29 and thats the secondary air pump injection circut.

and on sho box's web site it says tahts its N/A .. so what am i supposed to be looking at .. tonight im going to get under the car cuase i think i might have unplugged the knock sensor or hurt it in some way when i did my plugs and wires .. but after i did them ive had performance like crap and other issuse ... bad gas milage and a bumbly idle, so dose anyone know what i need to do ? can i test the knock sensor ? or is something in my pcm bad ? anything would be great if you help . also im not good with electronics so explane it like i have no clue what your talking about ( cuase i dont ) thanks every one for reading

 

ok so i just read that if i route my spark plug wires by the knock sensor that itll set a check engine light ?

 

It *can* set a check engine light. There is a test procedure for the knock sensor, I believe it includes checking the impedence on the knock sensor - you can probably find more about it by searching the forums.

It is unlikely there is anything wrong with the PCM, they rarely fail, but it does happen from time to time.

 

The N/A next to DTC 29 in Shoebox's code table applies ONLY to the 93 F-Body ECM - look at the headings at the top of the right hand column where "N/A" is entered. It is a valid code for the 94 PCM, and clearly indicates "Secondary Air Injection (AIR) pump circuit". Generally means the fuse for the AIR pump is blown.

DTC 43 means the knock sensor circuit is faulty. Key on/engine off, pull the single wire harness connector off the knock sensor. Measure voltage between the connector and the block. Should be about 5V. Wire still off, measure the resistance from the single pin on the knock sensor to the block. Should read in the range of 3,500-5,500 ohms. Put the connect back on the knock sensor and measure the voltage from the connector to the block. Should read about 2.5V. Anything outside the limit of 1.5V - 3.5V will set DTC 43.

When you have DTC 43, the PCM uses internal calculations to set knock retard, up to 15*. That will cause your engine to run poorly and lose power.

 

I have code 43 also. I'm running tunercat software. I found it in the constants tables, if I uncheck it will the PCM let my car run normal? I'm running really rich. I was wondering if I unchecked maby my car would run good....

 

Iwas testing my ks last fall and when i took it off my scanmaster showed o2 readings of 990 and kr of 12 degrees under light throttle and yes the car was running rich and mileage ,drivability etc was terrible. I also had code 29 and it was the air injector pump. I found one locally from someone who had their,s replaced under a recall and they didn,t need it any longer, and thus saved big bucks instead of buying new.