fyrfytr1717
NAXJA Forum User
- Location
- Turlock, CA
So I was finishing up wiring my engine fan override switch... The override worked, but I wanted to double check that I had tapped the right wires. I pulled Connector #1 from the ECM and checked continuity to make sure that I had tapped the ST-RUN wire and not the A/C Sense wire as they are both the same color. I confirmed I had the right one and went to plug the connector back in. I heard relays fluttering open and shut and realized that I had left the ignition in the "on" position.:doh:
I turned the ignition off, plugged the connector in, and turned the ignition back on. There was the dreaded CEL...
Code reader showed:
P1491 - ECM has detected an open or shorted condition in the radiator fan relay circuit.
P1694 - ECM has not received any CCD messages from the Aisin trans module within the ECM.
I had the codes erased to see if maybe something had just been momentarily shorted, triggering the CEL. As I pulled away from Autozone, the light came back on. It happened right when I turned my A/C on but that may have just been coincidence. Haven't had a chance to get the codes read again so I don't know if one or both codes came back.
The P1491 is not supposed to activate the CEL so I'm guessing I caused that one while I was doing my fan override wiring. Hopefully it is still gone.
The 1694 activates the CEL so I'm pretty sure that one came back. Now here's the strange thing, everything seems to be functioning just fine. Drives fine, shifts fine, no issues whatsoever that I detected driving it around today. I checked all the fuses that are part of either the radiator fan relay circuit or the transmission circuit and they're all fine. I know the fan relay is good as it still activates my fan with the manual switch. The radiator fan does not however seem to cycle on and off like it should when running the A/C.
So did I fry it? Is there an easy fix I'm overlooking?
I turned the ignition off, plugged the connector in, and turned the ignition back on. There was the dreaded CEL...
Code reader showed:
P1491 - ECM has detected an open or shorted condition in the radiator fan relay circuit.
P1694 - ECM has not received any CCD messages from the Aisin trans module within the ECM.
I had the codes erased to see if maybe something had just been momentarily shorted, triggering the CEL. As I pulled away from Autozone, the light came back on. It happened right when I turned my A/C on but that may have just been coincidence. Haven't had a chance to get the codes read again so I don't know if one or both codes came back.
The P1491 is not supposed to activate the CEL so I'm guessing I caused that one while I was doing my fan override wiring. Hopefully it is still gone.
The 1694 activates the CEL so I'm pretty sure that one came back. Now here's the strange thing, everything seems to be functioning just fine. Drives fine, shifts fine, no issues whatsoever that I detected driving it around today. I checked all the fuses that are part of either the radiator fan relay circuit or the transmission circuit and they're all fine. I know the fan relay is good as it still activates my fan with the manual switch. The radiator fan does not however seem to cycle on and off like it should when running the A/C.
So did I fry it? Is there an easy fix I'm overlooking?