• | 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. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
HO2S Heater Voltage Supply | Opens fuse | P0030, P0036, P0050, P0053, P0054, P0056, P0059, P0060, P0135, P0141, P0155, P0161 | P0030, P0036, P0050, P0056, P0135, P0141, P0155, P0161 | -- | P0135, P0141, P0155, P0161 |
HO2S Heater Low Control | P0030, P0036 | P0030, P0036, P0050, P0053, P0054, P0056, P0059, P0060, P0135, P0141, P0155, P0161 | P0030, P0036, P0050, P0056, P0135, P0141, P0155, P0161 | P0030, P0036, P0050, P0056, P0135, P0141, P0155, P0161 | P0135, P0141, P0155, P0161 |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Parameter Normal Range: 200-800 mV | |||
HO2S Heater Low Control | 0 A | 0 A | 0 A |
HO2S Heater Voltage Supply | 0 A | 0 A | 1-2 A |
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 sensors 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.
• | The ignition 1 signal parameter is between 10-18 volts. |
• | The engine speed is more than 400 RPM. |
• | DTCs 0050 or P0056 run once per drive cycle when the above conditions are met. |
• | DTCs P0112, P0113, P0117, P0118 are not set. |
• | The engine is started. |
• | The ignition voltage is less than 18 volts. |
• | The ignition is OFF form more than 10 hours. |
• | The Engine Coolant Temperature (ECT) Sensor parameter is between -30 and +45°C (-22 and +113°F) at engine start-up. |
• | The Engine Coolant Temperature (ECT) Sensor parameter minus the Intake Air Temperature (IAT) Sensor parameter is less than 8°C (14°F) at engine start-up. |
• | DTCs P0059 or P0060 run once per drive cycle when the above conditions are met. |
• | 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 50°C (122°F). |
• | The Ignition 1 Signal parameter is between 10-18 volts. |
• | The MAF Sensor parameter is between 3-40 g/s. |
• | The Engine Run Time parameter is more than 5 seconds. |
• | The Engine Speed parameter is between 500-3,000 RPM. |
• | DTC P0155 runs the heater current test once per drive cycle when the above conditions are met for 120 seconds. |
• | 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 50°C (122°F). |
• | The Ignition 1 Signal parameter is between 10-18 volts. |
• | The MAF Sensor parameter is between 3-40 g/s. |
• | The Engine Run Time parameter is more than 5 seconds. |
• | The Engine Speed parameter is between 500-3,000 RPM. |
• | DTC P0161 runs the heater current test twice per drive cycle when the above conditions are met for 120 seconds. |
• | The ECM detects that the affected HO2S heater low control circuit is not within a specified range at engine start-up. |
• | DTCs P0050, and P0056 set within 1 second when the above condition is met. |
• | The ECM detects that the affected HO2S heater low control circuit is not within a specified resistance range at engine start-up. |
• | DTCs P0059 sets within 1 second when the above condition is met. |
• | The ECM detects that the affected HO2S heater low control circuit is not within a specified resistance range at engine start-up. |
• | DTCs P0060 sets within 1 second when the above condition is met. |
• | The ECM detects that the HO2S 1 heater current parameter is more than 3.125 amps or less than 0.25 amp. |
• | DTC P0155 sets within 120 seconds during the heater current test when the above condition is met. |
• | The ECM detects that the HO2S 2 heater current parameter is more than 2.875 amps or less than 0.25 amp. |
• | DTC P0161 sets within 120 seconds during the heater current test when the above condition is met. |
DTC P0050, P0056, P0059, P0060, P0155, or P0161 is a Type B DTC.
DTC P0050, P0056, P0059, P0060, P0155, or P0161 is a Type B DTC.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If the hood position does not display Open, refer to Diagnostic Trouble Code (DTC) List - Vehicle. |
⇒ | If manipulation does affect the parameter then repair the harness or connector. |
Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
⇒ | If the hood position does not display Open, refer to Diagnostic Trouble Code (DTC) List - Vehicle. |
⇒ | If the test lamp does not illuminate, test the HO2S heater voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal and the HO2S heater voltage supply circuit fuse is open, test all components connected to the fuse and replace as necessary. |
• | B1S1 terminal C |
• | B1S2 terminal C |
⇒ | If the lamp illuminates, test the HO2S heater 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 HO2S heater low 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 0.0 amp. Less than 10 ohms may set a DTC. • Performing this test may set additional DTCs.
• | B1S1 terminal C |
• | B1S2 terminal C |
⇒ | If more than the specified range, test the HO2S heater voltage supply and HO2S heater low control circuits for more than 1 ohm. If the circuits test normal, replace the ECM. |
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 ECM replacement, setup, and programming |