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P0030



DTC P0030

DTC DESCRIPTOR

DTC P0030
HO2S Heater Control Circuit Bank 1 Sensor 1

DTC P0053
HO2S Heater Resistance Bank 1 Sensor 1

DTC P0135
HO2S Heater Performance Bank 1 Sensor 1

DIAGNOSTIC FAULT INFORMATION

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection






TYPICAL SCAN TOOL DATA

HO2S Heater:






CIRCUIT/SYSTEM DESCRIPTION
Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensor to reach operating temperature. Voltage is provided to the heater by the ignition 1 voltage circuit through a fuse. With the engine running, ground is provided to the heater by the HO2S heater low control circuit, through a low side driver within the engine control module (ECM). The ECM uses pulse width modulation (PWM) to control the HO2S heater operation to maintain a specific HO2S operating temperature range.

P0030
The ECM monitors the voltage on the HO2S heater low control circuit for heater fault diagnosis. If the ECM detects that the HO2S heater low control circuit voltage is not within a specified range, DTC P0030 sets for HO2S 1.

P0053
The ECM monitors the resistance on the HO2S heater circuit. If the ECM detects that the HO2S heater circuit resistance is not within the calibrated range on a cold start, engine OFF for more than 10 hours, DTC P0053 will set for HO2S 1.

P0135
The ECM determines the temperature by measuring the current flow through the heater. For diagnosis, the ECM monitors the heater current with the engine running. If the ECM detects that the HO2S 1 heater low control circuit current level is not within the calibrated range, DTC P0135 will set for HO2S 1.

CONDITIONS FOR RUNNING THE DTC

P0030
- The engine is cranking or running.
- The system voltage is between 11-18 volts.

P0053
- The ignition is OFF for more than 10 hours.
- The ECT Sensor parameter minus the IAT Sensor parameter is less than 8°C (14°F) at engine start-up.
- The ECT Sensor parameter is between -30 and +45°C (-22 and +133°F) at engine start-up.
- The system voltage is between 9-18 volts.
- This diagnostic runs one time per valid cold start when the above conditions are met.

P0135
- DTCs P0030, P0053, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0125, P0128, P0135, P0141, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0464, P0496, P2135 are not set.
- DTCs P2A01, P0420 are not commanding fuel.
- The system voltage is between 9-18 volts.
- The scan tool special functions are not active.
- The Engine Run Time parameter is more than 100 seconds.
- The ECT Sensor parameter is at least 65°C (149°F).
- The MAF Sensor parameter is between 4-30 g/s.
- The Engine Speed parameter is between 600-3,000 RPM.
- The above conditions have been met for at least 2 seconds.

CONDITIONS FOR SETTING THE DTC

P0030
- The ECM detects that the HO2S 1 heater control circuit status is incorrect for more than 2 seconds.
- This diagnostic runs continuously.

P0053
The ECM detects that the HO2S 1 heater calculated resistance is not within an expected range at engine start-up for one second.

P0135
- The HO2S heater current is less than 0.31 amps or more than 1.43 amps for at least 17 out of 20 samples. Five test samples during each trip with a 30 second delay between each test.
- Each test duration is one second.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

DIAGNOSTIC AIDS
When using a high impedance, low current draw, test lamp to load the heater circuit, the test lamp flash may be dim, the scan tool Heater Command parameter may indicate 7 percent, and the Heater parameter may indicate 0 amps. This is a normal condition.

CIRCUIT/SYSTEM VERIFICATION
Allow the engine to reach operating temperature. With the engine running, observe the HO2S Heater parameter with a scan tool. The value should vary from below 2 amps to above 0.2 amp.

CIRCUIT/SYSTEM TESTING
1. With the engine running at operating temperature, observe the HO2S Heater parameter with a scan tool and manipulate the related wiring and connectors. Manipulation should not affect the parameter.
- If manipulation does affect the parameter then repair the harness or connector.
2. With the ignition ON, the engine OFF, and the sensor disconnected, connect a test lamp between the HO2S sensor heater supply voltage circuit and ground. The lamp should illuminate.
- If the lamp does not illuminate then test the voltage supply circuit for high resistance or a short to ground.
3. With the ignition OFF, connect a test lamp between the HO2S sensor low control circuit and battery voltage. The lamp should not illuminate.
- If the lamp illuminates then test the low control circuit for a short to ground or a faulty control module.
4. With the engine RUNNING, leave the test lamp connected from the previous step. The lamp should flash or be ON steady.
- If the test lamp is not ON steady or flashing then test the control circuit for a short to voltage or a faulty control module.
5. Test for less than 5 ohms resistance in the HO2S sensor heater supply voltage circuit, the heater low control circuit, and the control module.
- If more than 5 ohms, repair the circuit with high resistance, or replace the control module.
6. If the ECM and all circuits test normal, replace the HO2S sensor.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1
- Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2
- Control Module References for ECM replacement, setup, and programming. Verification Tests

REPAIR VERIFICATION
1. Clear the DTCs with a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
- If this DTC resets, repeat this procedure.
- If this DTC does not reset but others do, perform those diagnostics.
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