DTC Codes and what to do with them?

[George_R]

I just outlined one of the numerous ways to get the car fkt up. To show that's not only speed sensor that can trigger the 42 code.

But, if everything is disconnected from ECU's pin (NSW) and the dtc 42 persists, it's time to check the sensor. Disconnect all the plugs from ECU and make sure that there's resistance in the range of 600 Ohm - 2000 Ohm between SP2+ and SP2- at harness plug (when ecu disconnected). That's the easiest check (always start with checking simplest assumptions like broken loom/sensor)

 

[Handgrenade]

You know, I'll look into it. I didn't always have code 12 though. But it's still worth checking to see if I'm retarded hahaha, yeah we already know the answer to that.

 

[sideshow]

ok cool
ive only seen code 42 on the early 1uzs and that wont come on till u drive car for 10 or so kms

so is code 42 purely the speed sensor
or does it relate to other things

im wondering if the customer of mine is having isseus due to code 42

 

[sideshow]

also is code 42 just for the speed signal from dash to ecu or from sp2+-

 

[George_R]

Jim, there's a number of reasons for dtc42
-slippage in transmission clutch plates
-pulses at speed sensor input when ecu thinks the car is in P or N
-no pulses when the car is in D and rpm above some threshold
-electromagnetic noise at speed sensor input
etc etc