I got the S300 installed, hooked up and tuned and everything seems to be working as it should. The only thing that I am noticing is that when the AC is turned on, there is no idle up and or the system does not maintain the 850rpm minimum idle speed that I have set in the parameters under the idle tab. I know that the IAC solinoid is working correctly as I have faked the coolent temp to the ECU and the idle is spot on based on the Idle Speed vs Coolant Temp parameters and also if I play with the IAC Duty Cycle, the idle speed does change. When the ac is turned on, the engine drops to and sustains around a 500rpm idle. According to the costumer, it worked fine before hand, but I do not know this for a fact.
Any Ideas as to what this could be? Have I turned something off and didn't realize it?
AC Idle problem
One thing to add that I noticed tonight before leaving the shop and figured that I would fix in the morning is that his tps is not adjusted correctly. Throttle fully closed is showing 3%.
To be honest, I am not really that familiar with Honda ECU's and engine managment system, I specialize in Toyotas. Now I do know that Toyota's have what is called an IDL switch built into the TPS and if the TPS is not adjusted correctly, the closed loop idle control will not function properly. Now I know that Honda's do not have this built into thier TPS's, but I am not sure if there is something of a simular nature built into the ECU that activates a closed loop idle control based on TPS output voltage. Could this be the problem or answer to the AC idle question that I asked above?
I guess that I will find out in the morning when I get into the shop if no one has replied befor then.
To be honest, I am not really that familiar with Honda ECU's and engine managment system, I specialize in Toyotas. Now I do know that Toyota's have what is called an IDL switch built into the TPS and if the TPS is not adjusted correctly, the closed loop idle control will not function properly. Now I know that Honda's do not have this built into thier TPS's, but I am not sure if there is something of a simular nature built into the ECU that activates a closed loop idle control based on TPS output voltage. Could this be the problem or answer to the AC idle question that I asked above?
I guess that I will find out in the morning when I get into the shop if no one has replied befor then.
If you make changes to the IACV duty, the idle should change, so this may indicate a problem with the idle valve.
I'm assuming that the s300 is datalogging correctly and changes you make affect the car. Then:
- reset the idle speed / coolant settings.
- set the TPS to 0%
- set the idle speed by unplugging the IACV. The idle should drop to around 400-500 rpm. If higher or lower, adjust the throttle body bypass screw. If the IAC makes no difference either plugged in or unplugged then pull it apart and clean it.
- check the AC switch is datalogging correctly. If not, start tracing the AC switch input (pin B5).
I'm assuming that the s300 is datalogging correctly and changes you make affect the car. Then:
- reset the idle speed / coolant settings.
- set the TPS to 0%
- set the idle speed by unplugging the IACV. The idle should drop to around 400-500 rpm. If higher or lower, adjust the throttle body bypass screw. If the IAC makes no difference either plugged in or unplugged then pull it apart and clean it.
- check the AC switch is datalogging correctly. If not, start tracing the AC switch input (pin B5).
Hondata