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Friday, December 3, 2010

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

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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

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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.

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