PCM to CCRM to ECT? Fans don't work?
Cooling fans won't turn on. Here's what I've done so far;
1. Replaced ECT sensor.
2. Disconnected CCR Module and verified the following;
(a) pin #8 had 12Volts
(b) pin #24 has no power
(c) no continuity between pin #8 & #24 on the control module
(d) good ground on pin #15
(e) pin 13 has 12V w/switch
Here's my main concern and I'm not sure I'm testing it right. I found info that says I should see about 1.4mega ohms between pin 13 (battery power) and pin 15 (ground) on the CCRM. I found .944 mega ohms on a cheap meter, so I don't know how accurate it is.
And here is the interesting thing. When I unplug the ECT sensor while the car is running, the fans turn on! Does that mean the CCRM is working? If so, then maybe there is a problem between the PCM and the CCRM? I'm trying figure out how the PCM signals the CCRM to turn on the fans. I bought a Chilton book, but it doesn't say. If I knew, I could apply the signal manually to the CCRM and see if it turns on the fans and then I could assume the PCM isn't sending the signal.