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Voltage reading on Sec. 02 but I only have Primary 02 Help!!
Posted: Thu Jun 02, 2005 4:39 pm
by Falcon
I am getting 2 Cels on my K20a EG swap. VTEC System mafunction (P1259); and Primary Heated Oxygen Sensor (P0135). I have the Primary sensor hooked up but I notice no voltage reading on the datalog but I am getting a reading on my Secondary O2 sensor. The lambda reading is constantly at 14.7. Please help.
Posted: Thu Jun 02, 2005 4:44 pm
by Falcon
I just checked my datalog and got the following:
O2 - 0.00V
O2C - -37.0mA
SO2 - 4.10V
AF - 14.70:1
I hope this helps
Posted: Fri Jun 03, 2005 9:05 am
by Hondata
With the wideband o2 ignore the voltage - the lambda is the only thing that matters.
P1259 - disable the VTEC oil pressure switch (you probably have a JDM ECU and/or harness).
P0135 - check your o2 wiring as per
http://www.hondata.com/techk20wiring.html The o2 sensor heater relay wiring as per the diagram is the only way which will work correctly.