Quote:
Originally Posted by Houston Ben
If I have #3 hooked up correctly 87a should have 12 volts to it correct??
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It depends on when you measure it. With all relays off (i.e. engine temp below the low speed fan temp) pin 87a should be at 0V with respect to ground. With Relay 1 on (i.e. temp above low speed fan temp but below the high speed temp) 87a should read about 6V. If both fans have the same motor it should be really close to 6V but it could vary by a couple of volts if they're not the same motor. With all 3 relays on (i.e. temp above high speed fan temp) 87a should read 12V.
If you can disconnect the control wires from the PCM, turn the ignition on with the engine off. If you ground the green wire in the diagram (fan control 1) both fans should run at half speed. If you ground both the green wire and the blue wire at the same time, both fans should run at high speed.
If the fans work as described above when disconnected from the PCM, then your problem is with the PCM programming or control wiring. If you get any other behavior, the problem is with the relay or fan wiring.