Circuit 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. Heating elements inside the HO2S minimize the time required for the sensors to reach operating temperature. The powertrain control module (PCM) supplies the HO2S with a reference, or bias, voltage of about 450 mV. When the engine is first started, the PCM operates in Open Loop, ignoring the HO2S voltage signal. Once the HO2S reaches operating temperatures and Closed Loop is achieved, the HO2S generates a voltage within a range of 0-1,000 mV that fluctuates above and below bias voltage. High HO2S voltage indicates a rich exhaust stream. Low HO2S voltage indicates a lean exhaust stream.
If the PCM detects the loop status is open too long, DTC P0130 will set.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0130 HO2S Circuit Bank 1 Sensor 1
Conditions for Running the DTC
| • | DTCs P0030, P0068, P0069, P0101, P0102, P0103, P0106, P0107, P0108, P0117, P0118, P0120, P0121, P0125, P0128, P0130, P0131, P0132, P0133, P0134, P0135, P0201, P0202, P0203, P0204, P0220, P1133, P1516, P1681, P2101, P2135, P2176 are not set. |
| • | The Engine Run Time parameter is more than 200 seconds. |
| • | The Engine Speed parameter is between 1,000-3,400 RPM. |
| • | The Ignition 1 Signal parameter is between 11-18 volts. |
| • | The Mass Airflow (MAF) Sensor parameter is between 10-50 g/s. |
| • | The Engine Coolant Temperature (ECT) Sensor parameter is more than 50°C (122°F). |
| • | The traction control is not active. |
| • | The catalyst protection mode is not active. |
| • | Decel fuel cut-off is not active. |
| • | Power enrichment is not active. |
| • | DTC P0130 runs continuously when the above conditions are met for 2 seconds. |
Conditions for Setting the DTC
| • | The PCM detects that the Loop Status parameter is open. |
| • | DTC P0130 sets within 50 seconds when the above condition is met. |
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. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Values | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views | ||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||
Is the HO2S 1 Heater parameter within the specified range? | 0.301-1.7 A | Go to Step 3 | Go to DTC P0135 | |||||||
3 |
Is the HO2S 1 parameter varying above and below the specified range? | 300-600 mV | Go to Step 4 | Go to Step 5 | ||||||
4 |
Did the DTC fail this ignition? | -- | Go to Step 5 | Go to Testing for Intermittent Conditions and Poor Connections | ||||||
5 |
Is the HO2S 1 parameter more than the specified value? | 800 mV | Go to Step 6 | Go to Step 7 | ||||||
6 |
Important:
Test the HO2S 1 high signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 17 | ||||||
7 |
Is the HO2S 1 parameter within the specified range? | 400-500 mV | Go to Step 9 | Go to Step 8 | ||||||
8 |
Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 14 | ||||||
9 |
Is the HO2S 1 parameter within the specified range? | 400-500 mV | Go to Step 11 | Go to Step 10 | ||||||
10 |
Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 15 | ||||||
11 | Measure the voltage from the high signal circuit of the HO2S 1 harness connector on the engine harness side to a good ground with a DMM. Refer to Circuit Testing . Is the voltage more than the specified value? | 1 V | Go to Step 12 | Go to Step 13 | ||||||
12 |
Important: The normal voltage on the low signal circuit is between 20-105 mV. Test the HO2S 1 low signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 17 | ||||||
13 | Test the HO2S 1 high signal circuit for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 15 | ||||||
14 | Test for an intermittent and for a poor connection at the HO2S 1. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 16 | ||||||
15 | Test for an intermittent and for a poor connection at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 17 | ||||||
16 |
Notice: Refer to Heated Oxygen Sensor Resistance Learn Reset Notice in the Preface section. Replace the HO2S 1. Refer to Heated Oxygen Sensor 1 Replacement . Did you complete the replacement? | -- | Go to Step 18 | -- | ||||||
17 | Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 18 | -- | ||||||
18 |
Did the DTC fail this ignition? | -- | Go to Step 2 | Go to Step 19 | ||||||
19 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | -- | System OK | |||||||
