Sonata GL V6-2.5L (1999)
Malfunction Indicator Lamp: Description and Operation
ON-BOARD DIAGNOSTICS
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The recording condition of diagnostic trouble code After the ECM first detects a malfunction, a diagnostic trouble code is recorded when he
engine is restarted and the same malfunction is re-detected. (Malfunction is detected in driving cycle). However, for fuel system rich/lean
misfiring, a diagnostic trouble code is recorded on the first detection of the malfunction.
The erasing condition of diagnostic trouble code. After recording the diagnostic trouble code, if the E,CM does not redetect the malfunction for 40
driving cycles, the diagnostic trouble code will be erased from the ECM memory. However, for fuel system rich/lean or misfiring, the diagnostic
trouble code will be erased under the following conditions.
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When driving conditions (engine speed, engine coolant temperature, etc.) are similar to those when the malfunction was first recorded.
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When the ECM does not re-detect the malfunction for 80 driving cycles.
NOTE : A "driving cycle" consists of engine start-up, vehicle operation beyond the beginning of closed loop operation.
MALFUNCTION INDICATOR LIGHT (MIL)
An On Board Diagnostic lamp comes on to notify the driver that there is any problem on the vehicle.
However MIL will go off automatically after 3 subsequent sequential driving cycles not redetected same malfunction.
Immediately after the ignition switch is turn on, the malfunction indicator light is lit for 5 seconds to indicate that the malfunction indicator light
operates normally.
Following Items will be Indicated by the MIL
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Catalyst
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Fuel system
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Air flow sensor (MAF sensor)
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Intake Air Temperature Sensor (IAT sensor)
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Engine Coolant Temperature Sensor (ECT sensor)
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Throttle Position Sensor (TPS)
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Upstream Oxygen Sensor
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Downstream Oxygen Sensor Heater
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Downstream Oxygen Sensor
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Upstream Oxygen Sensor Heater
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Injector
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Misfire
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Crankshaft Position Sensor (CKP sensor)
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Camshaft Position Sensor (CMP sensor)
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Evaporative Emission Control System
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Vehicle Speed Sensor (VSS)
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Idle Speed Control ECM
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Manifold Absolute Pressure (MAP) Sensor
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Idle Switch
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EGR System
MALFUNCTION INDICATOR LAMP (MIL) INSPECTION
1. After turning on the ignition key, check that the light illuminates for 5 seconds without engine running.
2. If the light does not illuminate, check for an open circuit in harness, blown fuse and blown bulb.
SELF-DIAGNOSIS
The ECM monitor the input/output signals (some signals at all times and the others under specified conditions). When the ECM detects that an
irregularity, it memorize the diagnostic trouble code, and outputs the signal to the self-diagnosis output terminal. The diagnosis results can be read out
