2004 Honda Civic

Tiny
MAURILIOSANCHES
  • MEMBER
  • 2004 HONDA CIVIC
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 46,700 MILES
A/c clutch not working when a/c switch is on
Tuesday, May 25th, 2010 AT 12:34 PM

7 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi mauriliosanches,

You would need to check if there is battery voltage at the AC clutch. If no power is available, then you need to check the compressor clutch relay.

Are the cooling fans turning on when the AC switch is operated?
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Friday, May 28th, 2010 AT 12:37 PM
Tiny
MAURILIOSANCHES
  • MEMBER
  • 4 POSTS
There is no voltage in the A/c Clutch. Also the cooling fan is not working.
I think the Ecu is bad or the multiplex, but I do know how to test them.
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Sunday, May 30th, 2010 AT 8:11 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Check for power supply to the ac clutch relay.
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Monday, May 31st, 2010 AT 9:22 AM
Tiny
MAURILIOSANCHES
  • MEMBER
  • 4 POSTS
Already checked. There is power, all the fuses are ok, The computer is not sending the signal to the a/c relay. (All wiring connection are good!)
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Monday, May 31st, 2010 AT 1:44 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
If the relay is not being grounded to activate the compressor, the mostlikely fault would be the PCM. This is a known problem.

At the PCM, use a test lamp to back probe the E18 terminal ( clutch relay, RED wire ) and if the compressor comes on, the wiring is ok and you have a faulty PCM.
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Monday, May 31st, 2010 AT 2:23 PM
Tiny
MAURILIOSANCHES
  • MEMBER
  • 4 POSTS
Yeap. The Pcm/ECU is not sending the ground.
Thanks a bunch.
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Monday, May 31st, 2010 AT 3:06 PM
Tiny
KHLOW2008
  • MECHANIC
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You're welcome.

Glad to know you have found the solution.

Have a nice day.
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Monday, May 31st, 2010 AT 3:58 PM

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