DTC Codes

K20EG · Post by **K20EG** » Mon Jun 06, 2005 11:30 am

I got my car to start up yesterday. I have the K20A2 motor with a custom race header and the stock RSX rubber intake with a filter at the end. When I upload the base RSX or tuned program the car idles very high 1500-1700 RPM and surges back and forth. Any reason why this is happening? But when I upload the base RSX with cold air program the car idles very smooth between 750-850 RPM. I'm not sure which program is best suited for my setup. The only program that idles and runs well is the base RSX with cold air.

Also I'm getting DTC codes.

SERIAL COMMUNICATION LINK MALFUNCTION P0600...what causes this error and how can I disable it?

SECONDARY O2 CIRCUIT HEATER CIRCUIT MALFUNCTION P0141...what causes this error and how can I disable it? Could it be that I haven't install the wide band O2 sensor on the header when I started the car?

Would it cause any harm to the ECU or motor if OBDII funtions are disabled? Does the car run better and stronger with OBDII functions turned off? What are the advantages and disadvantages?

Your inputs will be greatly appreciated.

krystar · Post by **krystar** » Tue Jun 07, 2005 3:04 pm

does it idle high even after warm up? what's ECT when it does idle that high? what's MAP when TPS is 0%.

not sure about the serial connection thing. u'll have to wait till hondata reads this post.

you can run with ODBII completely turned off. u just won't know if there are error codes reported to the ODBII system.

Post by **Spunkster** » Wed Jun 08, 2005 9:18 am

Serial link malfunction indicates that the multiplexor is not communicating. Simply disable the mutliplexor under MISC.

Secondary O2 error indicates your secondary O2 is either not connected, or is wired incorrectly. You may also try disabling OBD2 functions.

OBD2 functions have nothing to do with performance, they are emissions related.