• | 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 High Signal | P0131, P0132, P0137, P0140, P0151, P0152, P0157, P0158, P1133, P2A01, P2A04 | P0131, P0132, P0133, P0134, P0137, P0140, P0151, P0152, P0153, P0154, P0157, P0160, P1133, P1153, P2A01, P2A04 | P0131, P0132, P0133, P0134, P0137, P0140, P0151, P0152, P0153, P0154, P0157, P0160, P1133, P1153, P2A01, P2A04 | P0132, P0134, P0138, P0140, P0152, P0154, P0158, P0160, P1133, P1153, P2A01, P2A04 | P0133, P0134, P0140, P0153, P0154, P0160, P1133, P1153, P2A01, P2A04 |
HO2S Low Signal | P2A01, P2A04 | P0131, P0132, P0133, P0134, P0138, P0140, P0151, P0152, P0153, P0154, P0158, P0160, P1133, P1153, P2A01, P2A04 | P0131, P0132, P0133, P0134, P0138, P0140, P0151, P0152, P0153, P0154, P0158, P0160, P1133, P1153, P2A01, P2A04 | P0134, P0138, P0140, P0154, P0158, P0160, P1133, P1153, P2A01, P2A04 | P2A01, P2A04 |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Parameter Normal Range: 200-800 mV | |||
HO2S High Signal | 0 mV | Approximately 470 mV | Approximately 1,100 mV |
HO2S Low Signal | 455 mV | Approximately 450 mV | Approximately 445 mV |
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 engine control module (ECM) supplies the HO2S with a reference, or bias, voltage of about 450 mV. When the engine is first started, the ECM operates in Open Loop, ignoring the HO2S voltage signal. Once the HO2S reaches operating temperature 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.
• | DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set. |
• | The Loop Status parameter is Closed. |
• | The Ignition 1 Signal parameter is between 10-18 volts. |
• | The Fuel Level Sensor parameter is more than 10 percent. |
• | The Throttle Position (TP) Indicated Angle parameter is between 3-70 percent. |
• | DTC P0151 runs continuously when the above conditions are met for 2 seconds. |
• | DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set. |
• | The Loop Status parameter is Closed. |
• | The Ignition 1 Signal parameter is between 10-18 volts. |
• | The Fuel Level Sensor parameter is more than 10 percent. |
• | The Throttle Position (TP) Sensor parameter is between 0-70 percent. |
• | DTC P0152 runs continuously when the above conditions are met for 2 seconds. |
• | DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set. |
• | The Loop Status parameter is Closed. |
• | The Ignition 1 Signal parameter is between 10-18 volts. |
• | The Fuel Level Sensor parameter is more than 10 percent. |
• | The TP Sensor parameter is between 3-70 percent. |
• | DTC P0157 runs the lean test continuously when the above conditions are met for 2 seconds. |
• | DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set. |
• | The Loop Status parameter is Closed. |
• | The Ignition 1 Signal parameter is between 10-18 volts. |
• | The Fuel Level Sensor parameter is more than 10 percent. |
• | The TP Sensor parameter is between 3-70 percent. |
• | DTC P0158 runs the rich test continuously when the above conditions are met for 2 seconds. |
• | The ECM detects that the HO2S 1 Voltage parameter is less than 50 mV. |
• | DTC P0151 sets within 100 seconds during the lean test when the above condition is met. |
• | The ECM detects that the HO2S 1 parameter is more than 1,050 mV. |
• | DTC P0152 sets within 15 seconds during the rich test when the above condition is met. |
• | The ECM detects that the HO2S 1 voltage parameter is less than 50 mV. |
• | DTC P0157 sets within 100 seconds during the lean test when the above condition is met. |
• | The ECM detects that the HO2S 1 voltage parameter is more than 1,050 mV. |
• | DTC P0158 sets within 100 seconds during the rich test when the above condition is met. |
DTC P0151, P0153, P0157, P0158 are Type B DTCs.
DTC P0151, P0153, P0157, P0158 are Type B DTCs.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
• | The pre-catalyst oxygen sensors value should vary from below 200 mV to above 800 mV and respond to fueling changes. |
• | The post-catalyst oxygen sensors value should change more than 200 mV when the throttle is quickly cycled 3 times from closed to wide open and back to closed after running the engine at 1,500 RPM for 30 seconds. |
Notice: Refer to Silicon Contamination of Heated Oxygen Sensors Notice in the Preface section.
• | A silicon contaminated HO2S |
• | Fuel contamination--Refer to Alcohol/Contaminants-in-Fuel Diagnosis . |
• | Engine oil consumption--Refer to Oil Consumption Diagnosis . |
• | Engine coolant consumption--Refer to Loss of Coolant . |
Important: All modules must be powered down or misdiagnosis may result.
⇒ | If more than the specified range, test the appropriate HO2S low signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If more than the specified value, test the appropriate HO2S high signal circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If less than the specified value, test the appropriate HO2S high signal circuit for a short to ground. If the circuit tests normal, replace the ECM. |
⇒ | If the appropriate scan tool HO2S parameter does not toggle correctly, test the HO2S high signal circuit for an open/high resistance. If the circuits test normal, replace the ECM. |
Notice: Refer to Heated Oxygen Sensor Resistance Learn Reset Notice in the Preface section.
Important: For DTC P0151 and P0152, in order to ensure that the performance of the catalyst has not been affected by the fault that set this DTC, operate the vehicle within the conditions for running and setting DTC P0420 and verify that P0420 runs and passes. Refer to DTC P0420 or P0430 .
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for replacement, setup, and programming |