In California, cannot pass smog test with a check engine light/OBD code on. Emmissions part of Smog Test passed just fine. Its the functionality test that failed simply d/t the computer code.
It is OBD1 - Code 15 - Engine Coolant Sensor Code Error
Here's what I did so far:
1 - Changed Coolant Sensor twice with different brand names
2 - Purchased new wire pigtail and soldered in place in case of worn pigtail causing error
3 - Traced wires in harness for visual damage from sensor to computer - no damage found
4 - Checked 5v wire with multimeter - it shows 5 volts
5 - Checked Ground Wire on pigtail for ground. It show ground
6 - Changed Thermostat with correct 195 degree thermostat
7 - Last resort, purchased a used OBD1 PCM from a similar blazer in the junkyard and swapped. Same Code.
I don't know where to go from here. What else can cause this error if the sensor is good, the wires are good and its not the PCM?
Stumped. I just Rebuilt this entire motor and this light is keeping my from being able to register the vehicle.
have the same problem?
Saturday, August 9th, 2014 AT 12:25 AM