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1998 Honda Civic A/c Not working

  #11  
Old 06-15-2010, 03:07 PM
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Is the ECU connector under the passenger kick panel? I am trying to find exact location of the connector
 
  #12  
Old 06-15-2010, 03:17 PM
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Originally Posted by Love_Honda View Post
Is the ECU connector under the passenger kick panel? I am trying to find exact location of the connector
Yes. The connectors are plugged into the bottom of the ECU.

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  #13  
Old 06-15-2010, 05:41 PM
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Just checked; Results:

1) Unplugged the pressure switch and ground terminal 2 in the free wire harness connector. (Red and Blue). A/C kicked in and blow cold air when the engine and a/c is turned on

2) Unplugged the ECU connector and Checked voltage in A17. Did not show any voltage when the key is turned to II position. (By the way just want to be sure - a17 connector has two terminals - right? I connected the red probe of the multimeter to one and black to the other; Not sure if I need to swap and test again)
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  #14  
Old 06-15-2010, 05:51 PM
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Originally Posted by RonJ View Post
-Disconnect the pressure switch and (briefly) short the 2P plug terminals with a jumper wire to see whether the clutch engages.
^Try this test again.
 
  #15  
Old 06-15-2010, 06:12 PM
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Tried it. Shorted the 2P plug terminals of the pressure switch with a jumper wire. NO; It did NOT engage the clutch; No cold air
 
  #16  
Old 06-15-2010, 06:16 PM
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Look at the circuit diagram in post #2. Your results are suggesting that the Blu/Wht wire running between the pressure switch to just below the condenser fan relay is broken. Try to trace wire to locate the break.
 
  #17  
Old 06-15-2010, 06:39 PM
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Just to clarify : Ideally when there is no fault, When I shorted the 2P plug terminals of the pressure switch with a jumper wire, this should have kicked the A/c Clutch? Right?

Any suggestions on how to trace this wire? is this a loose wire running in the engine compartment?
 
  #18  
Old 06-15-2010, 07:01 PM
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Originally Posted by Love_Honda View Post
Just to clarify : Ideally when there is no fault, When I shorted the 2P plug terminals of the pressure switch with a jumper wire, this should have kicked the A/c Clutch? Right?

Any suggestions on how to trace this wire? is this a loose wire running in the engine compartment?
The A/C should have blown cold just like when you grounded terminal 2 of the unplugged pressure switch connector.

The problem could be a broken Blu/Wht wire or a bad hood fuse box. Start by checking for lack of continuity on the Blu/Wht wire between terminal 1 of the pressure switch connector and connector C214, which is plugged into connector C355 (see diagram).

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Last edited by RonJ; 06-15-2010 at 07:07 PM.
  #19  
Old 06-15-2010, 07:13 PM
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Ok; Thanks; I will check the continuity. In the meanwhile how do I check/test the bad hood fuse box you have indicated?

Many thanks again for your help
 
  #20  
Old 06-15-2010, 07:18 PM
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Originally Posted by Love_Honda View Post
Ok; Thanks; I will check the continuity. In the meanwhile how do I check/test the bad hood fuse box you have indicated?

Many thanks again for your help
That's a separate Blu/Wt-Blu/Wht wire continuity test from C355 to C905 (C353) on the underside of the hood fuse box.

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Last edited by RonJ; 06-15-2010 at 07:32 PM.

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