98 Grand Voyager V6 3.0 Bought new rad fans & pwm 'relay'. No go...

Since the PWM signal is a switched ground I would get a cheap analog multimeter and hook it to grey and dark green (once you are sure grey has good power) then turn on the A/C or get the engine hot, its voltage reading will show you the approximate PWM duty cycle, IE if the battery voltage is

Daniel, the orange 40 amp fuse is fine. I'd run the test in the morning, but all I've got is a digital VOM. I'll try to hustle an analog from neighbors tomorrow. I'm I even asking the right questions anymore? Mark

P1491 is Radiator Fan Control Relay *CIRCUIT*

The first step in the troubleshooting procedure is to check the Fused B(+) circuit for an open (which woulod incloude a burned out fuse).

Yeah, SRN, I'm aware that it's a "circuit". Like I said, I checked the 40 amp fuse, and a week ago, I got +12v at pin 1 on the relay connector. Mark

I'll give it some though but in the short you can wire the fan so it blows when the ignition is on. I'd not do this in the dead of winter (then again maybe I would is it ment getting home) but in Summer I have and run it that way until the part came in.

Thanks, guys. I'm not going to bypass straight to the fans/ battery/ fusebo= x, because here in NW Indiana we have to=20 pass emission tests to renew plates and registration. Check engine light'= s an automatic failure. I haven't done the test still gotta find an analog VOM. I've got +12v to th= e relay connector and good ground, so when I run the test if it fails, what= do I do next? What am I missing? Temp sensor? My dash temp gauge works fi= ne. Is it possible (God forbid) that it's the expensive computer gizmo that= runs everything? I need to figure this out pretty quick. Any help is welc= ome. Mark Goodall

My wife's picking up an analog VOM for $20 at the Shack, but she won't be back til 2 am. Meanwhile I'm going to go over everything and see if I missed anything. (for instance, even though the fan's new, I haven't checked it with the battery.) Thanks to Steve N. for the troublshooting guide. Can anybody tell me where the PCM module is physically located) Thanks, everybody. Mark Goodall

For the PCM location check the inner left fender well next to the Power distribution center box.(which is next to the battery.

This scan is out of the 2000 diagnostics manual. Location should be the same as the 1998 model

I'm having a hard time telling the difference between the 2 green wires on the relay connector. Rather than being dark & light green, mine are green & blue-green. Can anybody tell me whether the dark green is next to the black wire or next to the gray wire? They're also numbered 1 - 4 on the connector, so is dark green #2, or is it #3? I don't want to guess, so I can do the test right. Thanks, Mark.

Here is the pin out from the 1998 shop manual

Maybe this page is more helpful...........

You said the pin #1 is melted. From the diagram, #1 is ground. It grounds the powertrain control system. So the diagram says that your power train control module is shorted. I think you need to find a new power module. get one from car-part.com..

you can get electr com...

Thanks, u c, that's what I was afraid of. Can you tell me where the power module is located on the minivan? Also, what other symptoms might the vehicle have with the power module shorted? Thanks, Mark.