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 P0130: O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)DTC P0150: O2 Sensor Circuit Malfunction (Bank 2 Sensor 1)
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
HO2S Bank 1 Sensor 1 Signal | P0131 | P0130, P0134 | P0132 | P0130, P0133 |
HO2S Bank 1 Sensor 2 Signal | P0137 | P0140 | P0138 | P0139 |
HO2S Bank 2 Sensor 1 Signal | P0151 | P0150, P0154 | P0152 | P0150, P0153 |
HO2S Bank 2 Sensor 2 Signal | P0157 | P0160 | P0158 | P0159 |
Low Reference | -- | P0130, P0150 | P0134, P0140, P0154, P0160 | -- |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine operating in Closed Loop Parameter Normal Range: Fluctuates above and below 350-500 mV | |||
Sensor Signal | 0-60 mV | 400-415 mV | 5000 mV |
Low Reference | -- | 400-415 mV | 5000 mV |
Circuit Description
The engine control module (ECM) supplies a voltage near 450 mV between the heated oxygen sensor (HO2S) signal circuit and the low reference circuit. The HO2S varies the voltage over a range from about 1,000 mV when the exhaust is rich, down through about 10 mV when the exhaust is lean. The ECM monitors and stores the HO2S voltage information. The ECM evaluates the HO2S voltage samples in order to determine the amount of time that the HO2S voltage was out of range. Or, to detect if the HO2S signal voltage switches at the same rate at which the ECM is commanding the heater ON and OFF.
Conditions for Running the DTC
Condition 1 and 2
| • | DTC P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, or P0277 is not set. |
| • | The engine is operating. |
| • | The ignition voltage is greater than 10 volts. |
| • | The HO2S 1 heater duty cycle is greater than 70 percent for greater than 8 seconds. |
| • | The DTCs run continuously once the conditions above exist for greater than 20 seconds. |
Condition 3
| • | Before the ECM can report that DTC P0130 or P0150 failed, DTCs P0030, P0031, P0032, P0050, P0051, P0052, P0133, P0135, P0153, and P0155 must run and pass. |
| • | DTC P0030, P0031, P0032, P0050, P0051, P0052, P0133, P0135, P0153, P0155, P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, or P0277 is not set. |
| • | The engine is operating. |
| • | The ignition voltage is greater than 10 volts. |
| • | The air flow into the engine has exceeded 10 grams. |
| • | The calculated exhaust gas temperature is greater than 600°C (1,112°F). |
| • | The HO2S 1 heater duty cycle is less than 70 percent. |
| • | The HO2S 2 is operating in closed loop. |
| • | The DTCs run continuously once the conditions above exist for greater than 60 seconds. |
Conditions for Setting the DTCs
Condition 1
The ECM detects that the HO2S 1 signal voltage increases greater than 2 volts in 4 out of 6 HO2S heater switch OFF samples.
Condition 2
The HO2S 1 voltage is between 600-1,150 mV and the corresponding HO2S 2 voltage is less than 100 mV for greater than 1 second.
Condition 3
The HO2S 1 voltage is between 60-400 mV and the corresponding HO2S 2 voltage is less than 500 mV for greater than 1 second.
Action Taken when the DTCs Set
DTCs P0130 and P0150 are type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0130 and P0150 are type B DTCs.
Diagnostic Aids
| • | The HO2S 1 voltage should be between 350-550 mV with the ignition ON. If the voltage is greater than the specified value, there is a condition with the HO2S 1 circuits. If the voltage does not change after disconnecting the HO2S, the condition is between the sensor and the ECM. If the voltage is between 350-550 mV after disconnecting the sensor, the condition is with the HO2S 1. |
| • | Inspect the HO2S 1 harness connector for water intrusion. Moisture in a connector may cause voltage to bleed to other circuits within the connector. |
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, observe the appropriate scan tool HO2S 1 voltage parameter. The HO2S 1 voltage parameter should be less than 1,025 mV.
- Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate HO2S 1.
- Ignition ON, verify that the scan tool HO2S 1 parameter is between 350-500 mV.
- If all circuits/connections test normal, replace the appropriate HO2S 1.
| ⇒ | If greater than the specified range, test the signal circuit of the HO2S 1 for a short to the heater circuit. If the circuit/connections test normal, replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Engine Control Module Replacement for engine control module replacement, setup, and programming |
