Question2000 chrysler cirrus. 2.5 l v-6 160,000 km
Trouble codes P1489, P1490 showing
Check Engine light ON
Large radiator fan runs constantly when car running.
Small radiator fan does not kick in.
Have checked fuses 9 and 19 All OK
Battery voltage 12.5
Alternator output 14.4
Any suggestions for resolving the two trouble codes ?
Any suggestions for resloving the fan operation issue?
Course of action for further troubleshooting?
AnswerHi Wayne,
The codes are about an open or short in the low and high speed fan relay circuits which is consistent with your observation as to the fans' behavior. I would begin by switching the two fan relays in the power distribution box under the hood, the two at the very rear end of the box (slightly below the level in the front of the box). If the malfunction you are describing is reversed between the two fans, one cause is with the relay that makes the fan run continuously as its switch points much be stuck together.
The other relay would be suspect for having an "open" actuation coil. The actuation coil ends are between the front and back pins of both relays, so check for patency of both relays in that front-to-back pin pair.
You can verify that there is voltage on the front-most pin of the relay sockets when the ignition switch is in the 'run' position.
Also verify that there is 12v on the socket pin on the right (passenger) side of the socket. Also verify that when you jump from that right pin over to the pin socket on the left (driver) side that the fan for that relay turns on. Finally check that the rear pin of the low speed relay socket is patent to pin 55 at the engine controller is patent, and check that the rear pin of the high speed relay socket is patent to pin 69 of the engine controller. Also verify that neither of these wires is shorted to ground when the engine controller plug is removed from its socket.
Those are the basic possibilities, other than that the engine controller functions of those two pins (55 and 69) are faulty.
Do you have any wiring diagrams for these two relays? I could xerox and postal mail them to you. Use the "thank and rate" tab to get back to me without have to wait for my availability. Use the comment section to tell me what you have learned.
Roland
