1998 Honda Civic Compressor Fails to engage

Tiny
CL65AME
  • MEMBER
  • 1998 HONDA CIVIC
  • 4 CYL
  • 2WD
  • MANUAL
  • 214,000 MILES
I have been troubleshooting this for a while. Had it to the dealer and got some useless feed back.
The AC system is correctly charged and serviced.
The AC compressor clutch will not engage. I have carried out all of the TS in the Honda Service Manual and the only thing I can surmise is that the ECU is not supplying a ground to the Clutch relay. The wire checks fine from the A17 connection on the ECU to the under hood relay/fuse box. There is power at the pin when connected but the relay (which is fine) does not latch. If I supply a ground (through the back probe) to A17 the relay latches and the compressor engages.
I can only assume that the ECU is not supplying the ground for some reason. I am not sure what other functions affect this ground being supplied. I do not have a schematic of the ECU to see what other inputs are required to supply the ground.

Right now I have jumpered the Relay connections to supply power to the cluch through a manual switch.

HELP
Friday, July 11th, 2008 AT 8:34 AM

2 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi cl65ame,

The ECU is faulty. There is no ECU schematic available. If you want to try DIY, open up the ECU and look for leaking condensers, replacing them might solve the problem.
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Friday, July 11th, 2008 AT 11:08 AM
Tiny
CL65AME
  • MEMBER
  • 2 POSTS
As I thought. Thanks
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Friday, July 11th, 2008 AT 11:15 AM

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