Rotary Car Club - View Single Post - cooling fan problem (please see the bold font especially)

dudemaaan · 05-09-2008, 08:40 AM

thanks for that diagram, i had found a very similar diagram in the fsm, or one of the mazda wiring books. I traced everything back and marked the relays (1,2,3,4). i found my relays are definitely bad.

I managed to figure out answers to most all my questions except,
i discovered the relays controlled by the ECU, (2 and 4) the green and black wires that get the signal from the ECU (i believe they first go to the blue connector in the kickpanel) are turning the voltage on and off with the PFC like normal, but its only 5 volts, not 12 volts, is this normal? This is how i tested them.

I unplugged the relays to test the wires individually. I set the PFC to 0 for temperature then put a multimeter on the G/B wire of relay 2 and 4. got a positive 5 volts. Turned the temperature back up to 100 on PFC tested wires again 0 volts just like it should.

I expected that the voltage would be 12v, but i know alot of signals the ecu sends and receives are actually 5 v so maybe its normal?

05-09-2008, 08:40 AM	#3
dudemaaan Rotary Fanatic Join Date: Mar 2008 Location: Brenham, TX Posts: 335 Rep Power: 18	thanks for that diagram, i had found a very similar diagram in the fsm, or one of the mazda wiring books. I traced everything back and marked the relays (1,2,3,4). i found my relays are definitely bad. I managed to figure out answers to most all my questions except, i discovered the relays controlled by the ECU, (2 and 4) the green and black wires that get the signal from the ECU (i believe they first go to the blue connector in the kickpanel) are turning the voltage on and off with the PFC like normal, but its only 5 volts, not 12 volts, is this normal? This is how i tested them. I unplugged the relays to test the wires individually. I set the PFC to 0 for temperature then put a multimeter on the G/B wire of relay 2 and 4. got a positive 5 volts. Turned the temperature back up to 100 on PFC tested wires again 0 volts just like it should. I expected that the voltage would be 12v, but i know alot of signals the ecu sends and receives are actually 5 v so maybe its normal? __________________ 500+ HP thanks to: Fast reacting IAT sensor thread! Mechanical Pre-turbo Water Injection Thread Dual Stock fuel pumps Thread T2 differential swap! Last edited by dudemaaan; 05-09-2008 at 08:44 AM.