PS233

GROUP
Engine
NUMBER
PS233
SUBJECT:
MODEL
Sorento (BL)
2003~2006MY
DATE
January 2013
UNUSUAL FUEL TRIM VALUES AND/OR MISFIRE CODES
AFTER INCORRECT ENGINE REPAIR
If after an engine repair you encounter a complaint relating to MIL on (DTC P030X) with a
misfire during acceleration and/or you find unusual fuel trim values outside the normal
parameters, check for proper installation of the fuel injector wire harness. It is possible that
the electrical connectors for Bank 1 and Bank 2 have been installed backwards (left bank
versus right bank). If the fuel injector wiring harness is installed incorrectly, the HO2S
voltages will not fluctuate normally. Bank 1 HO2S will output approximately 0 volts while
Bank 2 HO2S output will remain around 1 volt, as the ECM is trying to compensate with fuel
trim adjustments. Long term fuel trim values will correspond to the voltage output of the
HO2S.
• Low HO2S output voltage = Increased enrichment;
• High HO2S output voltage = Decreased fuel enrichment towards lean.
Injector connector B-06 (fuel injector #5, right bank) is closest to X-45: Use it for
identification purposes. Route the harness connectors to the proper location and retest.
Refer to the sample screenshots on page 2 to verify the condition. Note that these
screenshots are from Hi Scan Pro (GDS screens will show similar information).
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