Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P0030: HO2S Heater Control Circuit Sensor 1DTC P0036: HO2S Heater Control Circuit Sensor 2
DTC P0053: HO2S Heater Resistance Sensor 1
DTC P0054: HO2S Heater Resistance Sensor 2
DTC P0135: HO2S Heater Performance Sensor 1
DTC P0141: HO2S Heater Performance Sensor 2
Diagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
HO2S Heater Voltage Supply | Opens fuse | P0030, P0036, P0053, P0054, P0135, P0141 | P0030, P0036, P0135, P0141 | -- | P0135, P0141 |
HO2S Heater Low Control | P0030, P0036 | P0030, P0036, P0053, P0054, P0135, P0141 | P0030, P0036, P0135, P0141 | P0030, P0036, P0135, P0141 | P0135, P0141 |
Typical Scan Tool Data
Circuit | Normal Range | Short to Ground | Open | Short to Voltage |
|---|---|---|---|---|
HO2S Heater Low Control | 0.5-2 A | 0 A | 0 A | 0 A |
HO2S Heater Voltage Supply | 0.5-2 A | 0 A | 0 A | 0.5-2 A |
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 an ignition 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.
Conditions for Running the DTC
P0030 or P0036
| • | The Ignition 1 Signal parameter is between 10-18 volts. |
| • | The engine speed is more than 400 RPM. |
| • | DTC P0030 and P0036 runs continuously when the above conditions are met for 1 second. |
P0053 or P0054
| • | DTCs P0112, P0113, P0117, P0118 are not set. |
| • | The engine is started. |
| • | The ignition is OFF for more than 10 hours. |
| • | The Engine Coolant Temperature (ECT) Sensor parameter is between 0-40°C (32-104°F) at engine start-up. |
| • | The ECT Sensor parameter minus the Intake Air Temperature (IAT) Sensor parameter is less than 8°C (14°F) at engine start-up. |
| • | DTCs P0053 and P0054 run once per drive cycle when the above conditions are met. |
P0135
| • | DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set. |
| • | The ECT Sensor parameter is more than 70°C (158°F). |
| • | The Ignition 1 Signal parameter is between 10-18 volts. |
| • | The MAF Sensor parameter is between 5-25 g/s. |
| • | The Engine Run Time parameter is more than 60 seconds. |
| • | The Engine Speed parameter is between 500-3,000 RPM. |
| • | DTC P0135 runs the heater current test twice per drive cycle when the above conditions are met for 2 seconds. |
P0141
| • | DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set. |
| • | The ECT Sensor parameter is more than 70°C (158°F). |
| • | The Ignition 1 Signal parameter is between 10-18 volts. |
| • | The MAF Sensor parameter is between 5-25 g/s. |
| • | The Engine Run Time parameter is more than 60 seconds. |
| • | The Engine Speed parameter is between 500-3,000 RPM. |
| • | DTC P0141 runs the heater current test twice per drive cycle when the above conditions are met for 2 seconds. |
Conditions for Setting the DTC
P0030 or P0036
| • | The ECM detects that the affected HO2S heater low control circuit is not within a specified range. |
| • | DTCs P0030 and P0036 set within 3 seconds when the above condition is met. |
P0053 or P0054
| • | The ECM detects that the affected HO2S heater low control circuit is not within a specified range at engine start-up. |
| • | DTCs P0053 and P0054 set within 1 second when the above condition is met. |
P0135
| • | The ECM detects that the HO2S 1 heater current parameter is more than 2.5 amps or less than 0.25 amp. |
| • | DTC P0135 sets within 30 seconds during the heater current test when the above condition is met. |
P0141
| • | The ECM detects that the HO2S 2 heater current parameter is more than 2.5 amps or less than 0.25 amp. |
| • | DTC P0141 sets within 30 seconds during the heater current test when the above condition is met. |
Action Taken When the DTC Sets
DTCs P0030, P0036, P0053, P0054, P0135 and P0141 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0030, P0036, P0053, P0054, P0135 and P0141 are Type B DTCs.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Allow the engine to reach operating temperature.
- Engine running, observe the HO2S Heater parameter with a scan tool. The value should vary between 0.5-2 A.
- 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 data.
Circuit/System Testing
- Disconnect the sensor.
- Ignition ON, connect a test lamp between the HO2S heater voltage supply circuit terminal D and ground. The lamp should illuminate.
- Ignition OFF, connect a test lamp between the HO2S low control circuit terminal C and battery voltage. The lamp should not illuminate.
- Engine running, leave the test lamp connected from the previous step. The lamp should flash or be ON steady.
- Ignition OFF, install a 30A fused jumper wire from the heater supply circuit terminal D to the heater control circuit terminal C.
- Engine running, observe with a scan tool that the Heater parameter indicates 0 A.
- If the ECM and all circuits test normal, replace the HO2S.
| ⇒ | If the lamp does not illuminate, test the voltage supply circuit for an open/high resistance or a short to ground. |
| ⇒ | If the circuit tests normal and its fuse is open, replace the HO2S. |
| ⇒ | If the lamp illuminates, test the low control circuit for a short to ground. If the circuit tests normal, replace the ECM. |
| ⇒ | If the test lamp is not on steady or flashing, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM. |
Note:
• The output driver should detect a short to voltage and turn OFF. If a resistance fault is present, the driver will remain ON and the scan tool will display more than 0 amp. Less than 10 ohms may set a DTC. • Performing this test may set additional DTCs.
| ⇒ | If more than the specified value, test the heater voltage supply and control circuits for resistance greater than 3 ohms. If the circuits test normal, replace the ECM. |
Repair Instructions
Caution: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution in the Preface section.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for control module replacement, setup, and programming |
