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The more I think about this, I lean towards barnyb’s suggestion that this might be a good voltage/poor amperage issue…
like a severed wire holding on by a strand for example.
everything will test good… voltage.. continuity… and you just end up scratching your head and wondering why won’t anything work.. until you find out that you are not getting good current.. and amperage is usually the toughest thing to test because with cheap multi-meters you’d have to actually connect the ammeter in series with the circuit.. effectively making your meter part of the circuit. on top of that, most cheap multi-meters can only read up to 10 amps before frying the meter.
The more I think about this, I lean towards barnyb’s suggestion that this might be a good voltage/poor amperage issue…
like a severed wire holding on by a strand for example.
everything will test good… voltage.. continuity… and you just end up scratching your head and wondering why won’t anything work.. until you find out that you are not getting good current.. and amperage is usually the toughest thing to test because with cheap multi-meters you’d have to actually connect the ammeter in series with the circuit.. effectively making your meter part of the circuit. on top of that, most cheap multi-meters can only read up to 10 amps before frying the meter.
you’ve stated that the following conditions are true:
You get 12v power to the fan.
Applying your own ground to the fan motor has no effect.
You have a bad fan motor.
Remove & replace.
but…
this contradicts another statement you said was true…
You’ve applied power to the fan and it works.
Because of this confusion, I am not sure where to go from here.
you’ve stated that the following conditions are true:
You get 12v power to the fan.
Applying your own ground to the fan motor has no effect.
You have a bad fan motor.
Remove & replace.
but…
this contradicts another statement you said was true…
You’ve applied power to the fan and it works.
Because of this confusion, I am not sure where to go from here.
So to recap:
You’ve applied power to the fan and it works.
You’ve jumped 87 & 30 and the fan doesn’t work.
You get 12v power to the fan.
Applying your own ground to the fan motor has no effect.
Q: are all the above statements true…
So to recap:
You’ve applied power to the fan and it works.
You’ve jumped 87 & 30 and the fan doesn’t work.
You get 12v power to the fan.
Applying your own ground to the fan motor has no effect.
Q: are all the above statements true…
Since I have voltage at the fan, should I at least assume the PCM is doing it’s part?
This piece of information may imply that you have a problem in the ground circuit.
Apply your own ground to the #2 fan motor and see if your fan operates normally…
Since I have voltage at the fan, should I at least assume the PCM is doing it’s part?
This piece of information may imply that you have a problem in the ground circuit.
Apply your own ground to the #2 fan motor and see if your fan operates normally…
Jump 87 and 30 and see if your fan comes on.
IF it does come on, we can rule out a “load side” problem. In this case I would lean towards wysetech’s suggestion of a signal problem (possibly with the PCM) in which case a bi-directional scan tool will be needed for further diagnosis.
Test the circuit for continuity before condemning the PCM.
Jump 87 and 30 and see if your fan comes on.
IF it does come on, we can rule out a “load side” problem. In this case I would lean towards wysetech’s suggestion of a signal problem (possibly with the PCM) in which case a bi-directional scan tool will be needed for further diagnosis.
Test the circuit for continuity before condemning the PCM.
if the measure the wiring harness that supplies the fan with power the meter reads 12v?
could someone translate this for me please.
Perform the aforementioned jumper test in order to identify and isolate the fault as being either on the “signal (control)” or “load” side of the circuit.
Report your results back to this forum.
Q: Just out of curiosity, does your A/C compressor clutch engage? (Do you hear a ‘clunk’ when you turn on your a/c or does your a/c blow cold)
if the measure the wiring harness that supplies the fan with power the meter reads 12v?
could someone translate this for me please.
Perform the aforementioned jumper test in order to identify and isolate the fault as being either on the “signal (control)” or “load” side of the circuit.
Report your results back to this forum.
Q: Just out of curiosity, does your A/C compressor clutch engage? (Do you hear a ‘clunk’ when you turn on your a/c or does your a/c blow cold)
Pull the #3 relay. Now using a paper clip, ‘jump’ the relay socket at terminals 30 and 87 in an attempt to ‘force’ your #2 fan to work.
Your relay may or may not match this picture; but it will give you the idea… most relays have the pins numbered on the relay itself; use this as a guide to show where to actually apply the jumper.
Pull the #3 relay. Now using a paper clip, ‘jump’ the relay socket at terminals 30 and 87 in an attempt to ‘force’ your #2 fan to work.
Your relay may or may not match this picture; but it will give you the idea… most relays have the pins numbered on the relay itself; use this as a guide to show where to actually apply the jumper.
