Obd-Ii System Readiness Tests - Hyundai GENESIS COUPE BK 2010 Manual

6. Computer output circuits
7. Transmission
The last two numbers of the DTC indicates the component or section of the system where the fault is located.
11) Freeze frame data
When a freeze frame event is triggered by an emission related DTC, the ECM or PCM stores various vehicle
information as it existed the moment the fault ocurred. The DTC number along with the engine data can be useful in
aiding a technician in locating the cause of the fault. Once the data from the 1st driving cycle DTC ocurrence is stored
in the freeze frame memory, it will remain there even when the fault ocurrs again (2nd driving cycle) and the MIL is
illuminated.
• Freeze Frame List
1) Calculated Load Value
2) Engine RPM
3) Fuel Trim
4) Fuel Pressure (if available)
5) Vehicle Speed (if available)
6) Coolant Temperature
7) Intake Manifold Pressure (if available)
8) Closed-or Open-loop operation
9) Fault code

3. OBD-II system readiness tests

1) Catalyst monitoring
The catalyst efficiency monitor is a self-test strategy within the ECM or PCM that uses the downstream Heated Oxygen
Sensor (HO2S) to determine when a catalyst has fallen below the minimum level of effectiveness in its ability to control
exhaust emission.
2) Misfire monitoring
Misfire is defined as the lack of proper combustion in the cylinder due to the absence of spark, poor fuel metering, or
poor compression. Any combustion that does not occur within the cylinder at the proper time is also a misfire. The
misfire detection monitor detects fuel, ignition or mechanically induced misfires. The intent is to protect the catalyst from
permanent damage and to alert the customer of an emission failure or an inspection maintenance failure by illuminating
the MIL . When a misfire is detected, special software called freeze frame data is enabled. The freeze frame data
captures the operational state of the vehicle when a fault is detected from misfire detection monitor strategy.
3) Fuel system monitoring
The fuel system monitor is a self-test strategy within the ECM or PCM that monitors the adaptive fuel table The fuel
control system uses the adaptive fuel table to compensate for normal variability of the fuel system components caused
by wear or aging. During normal vehicle operation, if the fuel system appears biased lean or rich, the adaptive value
table will shift the fuel delivery calculations to remove bias.
4) Engine cooling system monitoring
The cooling system monitoring is a self-test strategy within the ECM or PCM that monitors ECTS (Engine Coolant
Temperature Sensor) and thermostat about circuit continuity, output range, rationality faults.
5) O2 sensor monitoring
OBD-II regulations require monitoring of the upstream Heated O2 Sensor (H2OS) to detect if the deterioration of the
sensor has exceeded thresholds. An additional HO2S is located downstream of the Warm-Up Three Way Catalytic
Converter (WU-TWC) to determine the efficiency of the catalyst.
Although the downstream H2OS is similar to the type used for fuel control, it functions differently. The downstream
HO2S is monitored to determine if a voltage is generated. That voltage is compared to a calibrated acceptable range.
6) Evaporative emission system monitoring
The EVAP. monitoring is a self-test strategy within the ECM or PCM that tests the integrity of the EVAP. system. The
complete evaporative system detects a leak or leaks that cumulatively are greater than or equal to a leak caused by a
0.040 inch and 0.020 inch diameter orifice.