How it Works & What is Code P0030?\

How it Works & What is Code P0030?

Model: Hyundai EQUUS VI

Year of model: 2011

Fuel: Gasoline

Displacement: 4600cc

How it Works & What is Code P0030

P0030 HO2S Heater Control Circuit (Bank 1 / Sensor 1)

Study Guide and Component Location Study Guide and General Description Study The normal operating temperature of the HO2S(Heated Oxygen Sensor) ranges from 350 to 850°C(662 to 1562°F). Study The HO2S heater greatly decreases the amount of time required for fuel control to become active. The ECM provides a pulse width modulated control circuit to adjust current through the heater. Study When the HO2S is cold, the value of the resistance is low and the current in the circuit is high. On the contrary, if the temperature in the resistor of the sensor rises, the current drops gradually. Study Guide and DTC Description Study When ECM detects open in the heater control circuit(B1S1), ECM sets DTC P0030. Study Guide and DTC Detecting Condition Item Detecting Condition Possible Cause Case1 Study DTC Strategy Study • Heater current check • Poor connection • Open or Short to ground in power circuit • Open in control circuit • B1S1 Enable Conditions Study • 350C < temp(EGT around Upstream O2S (model)) < 550C • IAT > -7C • 10.7V < B+ volt < 16.1V Threshold Value Study • Internal resistance > threshold f(cat. temp., heater power) Diagnostic Time Study • 15 sec Case2 Study DTC Strategy • Power stage diagnosis Enable Conditions Study • - Threshold Value Study • Heater check open Diagnostic Time Study • Continuous MIL ON Condition Study • 2 driving cycle Study Guide and Specification Heater Resistance (Ω) 8.1 ~ 11.1 Ω at 21°C(69.8°F) Study Guide and Signal Waveform & Data Fig.1) The signal waveforms of front HO2S(the lower) and heater(the upper) at idle Study The output voltage of front HO2S is changed continuously accroding to air/fuel ratio,Study ECM controls fuel amount based on this value. Study Preheating is necessary for HO2S normal operation. Study Therefore heater unit is installed in HO2S, ECM can control air/fuel ratio with the output signal of HO2S simultaneous with engine run by reducing preheating time. Study ECM controls heater with duty cycle. Study HO2S' power source is main relay and ECM operates heater by ground control.