donkeylips
Well-known member
My ECU is throwing a code 21.
1. I checked continuity between the two wires at the sensor, and the coolant temp sensor pin (YG wire) and sensors ground pin (GB wire) at the ecu connector. Both had continuity.
2. I checked the resistance of the sensor - it seemed to be in the ballpark, between 1500 and 2500 ohms. Then I swapped in a spare used sensor that had similar resistance, and it still threw the code.
3. So finally I tried a different ECU, and that one throws the same code.
The car is running very rich and I can't get the CEL to go off. I am stumped here. It seems that I have checked everything relevant, unless both of my sensors were bad, which I doubt. Most everything is stock, besides a Walbro 255 pump (not rewired) with a factory fuel pressure regulator (no fuel pressure solenoid). Ideas?
1. I checked continuity between the two wires at the sensor, and the coolant temp sensor pin (YG wire) and sensors ground pin (GB wire) at the ecu connector. Both had continuity.
2. I checked the resistance of the sensor - it seemed to be in the ballpark, between 1500 and 2500 ohms. Then I swapped in a spare used sensor that had similar resistance, and it still threw the code.
3. So finally I tried a different ECU, and that one throws the same code.
The car is running very rich and I can't get the CEL to go off. I am stumped here. It seems that I have checked everything relevant, unless both of my sensors were bad, which I doubt. Most everything is stock, besides a Walbro 255 pump (not rewired) with a factory fuel pressure regulator (no fuel pressure solenoid). Ideas?