Accent L4-1.6L (2003)
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Barometric pressure sensor
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Engine coolant temperature sensor
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Throttle position sensor
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Intake system (vacuum) leaks
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Low battery charge
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Spark plugs
The PCM does not monitor either oxygen sensor signal when the engine management system is in open loop or when the purge solenoid is operating.
If codes other than oxygen sensor codes are present, diagnose/repair these conditions BEFORE continuing with oxygen sensor diagnosis.
NOTE: A malfunctioning front oxygen sensor may cause fuel trim codes to set.
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Several Diagnostic Trouble Codes use specific terminology to refer to sensor location. The illustration and key below explain the following terms:
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Engine BANK Bank 1 is closer to the dash panel, (also referred to as RH or right hand). Bank 2 is closer to the radiator, (also referred to as LH or
left hand).
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UP Refers to Sensor 1 or "front sensor". It is located closer to the exhaust manifold and before the catalytic converter.
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DOWN Refers to Sensor 2 or "rear sensor." It is located after the catalytic converter.
The following examples show how to interpret oxygen sensor terminology:
B1/S1 = Bank 1/Sensor 1 = Dash panel side, BEFORE the catalyst or "upstream"
B2/S2 = Bank 2/Sensor 2 = Radiator side, AFTER the catalyst or "downstream"
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The Hi-Scan Pro testing procedure is provided in the following section. The Hi-Scan Pro test is a quick procedure that provides basic sensor
information.
Hi-Scan Pro Testing Procedure
Connect the Hi-Scan Pro and retrieve all diagnostic codes. Record the codes and freeze frame data (if available) for later reference.
1. A. Warm up the vehicle to operating temperature (for at least 3 minutes)
B. Select vehicle, year, etc.
C. Select "Engine"
D. Select "Data"
E. After OBD II data appears press "N"
