Po code 128 help

 

What temperature is your dash gauge reporting?

If you have a scanner with live data, what temperature is the scanner reporting? Is there any freeze frame data with the code?


George

 

My temp gauge shows about 150 or 160 thanks George

 

Here are the proper steps to diagnose:

1. make sure that the cooling system is full and properly bled
2. Make sure that the thermostat is good
3. Jumper the ECT harness signal wire to signal ground with a fused jumper wire and read ECT with a scanner, should read 280F. If not try battery ground.
4. Test the signal wire and lo ref for shorts, opens, high resistance
5. Test the ECT sensor

I can help you with any of these steps if you like.


George

 

Thanks for info I will ck it out this weekend

 

George
I went the easy route l checked my maintenance records and I replaced my thermostat back in 2011 so I just bought a new one and replaced it problem solved normal temperature back to normal thanks for all the help though

 

Glad your fixed up

George