[jakevaj]

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.

 

[iwilson]

P0600 Is just saying that the OBDII scanner is losing it's connection with the ECU

P0141 Indicates a problem with the secondary O2 sensor heater circuit - not the primary wideband. Do you have it installed?

Disabling the OBDII functions will make no difference from a performance perspective. But you won't see problems unless you plug in a scan tool.

 

[LCDC5]

P0600 Is just saying that the OBDII scanner is losing it's connection with the ECU

P0141 Indicates a problem with the secondary O2 sensor heater circuit - not the primary wideband. Do you have it installed?

Disabling the OBDII functions will make no difference from a performance perspective. But you won't see problems unless you plug in a scan tool.

With the OBDII features enabled, and not having a secondary 02 sensor would it not allow the motor to engage in VTEC? I am getting the same code with my K-100, as this feature was not disabled. I don't think Vtec is switching over, also the multiplexor is enabled would this effect it? All help would be greatly appreceiated.

 

[iwilson]

VTEC should still engage. I've run my engine without the primary O2 sensor and VTEC still engaged. One cause of non-engagement is a faulty VTEC oil pressure sensor.

 

[LCDC5]

VTEC should still engage. I've run my engine without the primary O2 sensor and VTEC still engaged. One cause of non-engagement is a faulty VTEC oil pressure sensor.

Wouldn't I get a code for the oil pressure sensor? Maybe it is engaging but the car feels slow, my RSX with a K20A swap is faster than my EG with an A2 Swap, the only thing that I can think of is that I still have a stock intake pipe, but how much of a difference could that make?

 

[hybrid racing]

Is the speedometer working on the car that is not engaging Vtec?

 

[LCDC5]

Is the speedometer working on the car that is not engaging Vtec?

The speedometer seems to be working fine. Would that effect it?