mat89RS

Does code 43 affects the engine ??? or is it just to tell you the knock snesor is deffective ???

shoebox

It will retard the timing until you get it fixed.

mat89RS

Thx, that will help me.

mat89RS

is DTC43 indicates a knock or just a bad sensor ??
or
does it see it as a bad sensor or knock within the engine ?

MZK4252

DTC 43 is set when the sensor voltage is out of range. So it would only set when the sensor or the associated wiring is bad.

95z28 -quicksilver

Check the sensor itself and make sure its on there good. I was throwing a 43 and the only problem was that it was loose and giving false knock. I was running super rich because of it and was getting like 9 or 10 MPG. Give that a try beofre assuming the worst.


Chris

96ZRDR

I had code DTC 43, and the ran like crap. The culprit to mine is that it had to much silicone sealant around the thread where it goes on the block. It needs to make contact to get ground from it.

Good Luck, and fix it. You are sure to lose mucho power.

mat89RS

ok well , I've tried to do the 5V test and all I'm getting is 0.15volt.

That's with key "on" engine "off"

what should I do next since the wire is in good condition?

shoebox

Obviously you are not getting voltage to the sensor. Check continuity on the wire from the connector to the pcm harness connector. Blue pcm connector, pin 22 should be the dk blu wire for the knock sensor (at least by my 1995 diagram). If the wire checks out ok, then check for the 5v on the pcm itself. Make sure you look at the pins on the pcm and connector to be sure you simply don't have a bent one.

mat89RS

I will check this out tommorow, thx.

One thing is, the wire is ok, I verified and I don't think it could be a bent pin since I'm getting 0.14-0.15 volt from the wire.


Could that be a damage ecm ??? like the car is running, the only problems that I got are the code 26 and 43, I can't figure the code 26 since everything seems ok except the fact that the ECM is not grounding the solenoid.

Could this be a damaged ground to wiring harness or something ??? where does the ecm takes it's ground sources ???

shoebox

I would not count 0.15 as any meaningful voltage. It could get that much just through induction from other wires.

The computer grounds are on the outside coil stud and a small ground wire attached to the block above the starter (near the knock sensor).

mat89RS

Is this 2 black wires together ???? that might be my problem...

shoebox

I don't have a diagram for the 1993, but on a 1995 the pcm grd wires on the coil stud are tan/wht (two wires joined together on one ring) and the one by the starter is blk/wht. Yours may be different. On the coil stud, there is also a black wire for the cruise control module and a braided ground strap that goes to the chassis.

mat89RS

If the ground near the KS is not connected or broken or has a bad connection, do you think that can be causing my DTC 26 ans DTC 43 since everything else has been checked ???

shoebox

I know that there have been people that have run their cars with this accidentally unconnected and it ran, but with the trouble you are having, who knows?

I would still verify the continuity of that wire to the KS and maybe check for voltage output on the pin on the back of the ECM.