PRE-RELEASE
DTC P0131, P0132, P0134, P0137, P0138, or P0140
| DTC P0131, P0132, P0134, P0137, P0138, or P0140 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC P0131
HO2S Circuit Low Voltage Sensor 1
DTC P0132
HO2S Circuit High Voltage Sensor 1
DTC P0134
HO2S Circuit Insufficient Activity Bank 1 Sensor 1
DTC P0137
HO2S Circuit Low Voltage Sensor 2
DTC P0138
HO2S Circuit High Voltage Sensor 2
DTC P0140
HO2S Circuit Insufficient Activity Bank 1 Sensor 2
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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HO2S High Signal
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P0131, P0137
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P0132, P0134, P0138, P0140
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P0132, P0134, P0138, P0140
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P0133, P013A, P013B, P013E, P013F, P1133, P2A00
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HO2S Low Signal
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P0131, P0137
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P0132, P0134, P0138, P0140
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P0132, P0134, P0138, P0140
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P0133, P013A, P013B, P013E, P013F, P1133, P2A00
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HO2S Heater Voltage Supply
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P0030, P0036, P0132, P0135, P0138, P0141, *
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P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141
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P0690
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P0135, P0141
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HO2S Heater Control
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P0030, P0036, P0053, P0054, P0135, P0141
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P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141
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P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141
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P0135, P0141
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* Opens fuse
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HO2S Sensor 1 Voltage
| Circuit | Short to Ground | Open | Short to Voltage |
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Operating Conditions:
Engine running
Parameter Normal Range: 200-800 mV |
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HO2S High Signal
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0 V
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1.9 V
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1.9 V
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HO2S Low Signal
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0 V
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1.9 V
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1.9 V
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| Circuit/System Description |
The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1,275 mV. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control module uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1,000 mV indicates a rich fuel mixture. An HO2S voltage that decreases toward 0 mV indicates a lean fuel mixture.
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the control module to calculate the air-to-fuel ratio sooner.
| Conditions for Running the DTC |
P0131, P0137
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DTCs P0068, P0101, P0102, P0103, P0122, P0123, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0279, P0280, P0282. P0283, P0411, P0442, P0443, P0446, P0449, P0452, P0453, P0455, P0496, P1104, P1248, P1249, P124A, P124B, P124C, P124D, P124E, P124F, P16F3, P2100, P2101, P2102, P2103, P2135, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P216B, P216C, P216E, P216F, P217B, P217C, P217E, P217F, P2440, P2444 are not set.
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The engine is in Closed Loop status.
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The system voltage is between 10-32 V.
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The fuel level is greater than 10 percent.
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The scan tool device controls are not active.
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Deceleration fuel cut off not active.
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Fuel composition is less than or equal to 87 percent ethanol.
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DTCs P0131 and P0137 run continuously when the above conditions are met for 5 s.
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P0132, P0138
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DTCs P0068, P0101, P0102, P0103, P0122, P0123, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0279, P0280, P0282. P0283, P0411, P0442, P0443, P0446, P0449, P0452, P0453, P0455, P0496, P1104, P1248, P1249, P124A, P124B, P124C, P124D, P124E, P124F, P16F3, P2100, P2101, P2102, P2103, P2135, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P216B, P216C, P216E, P216F, P217B, P217C, P217E, P217F, P2440, P2444 are not set.
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The system voltage is between 10-32 V.
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The fuel level is greater than 10 percent.
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Engine run time greater than 2.5 min plus a 40 s delay.
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Fuel control is not in power enrichment.
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Fuel composition is less than or equal to 87 percent ethanol.
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DTCs P0132 and P0138 run continuously when the above conditions are met for 5 s.
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P0134, P0140
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DTCs P0068, P0101, P0102, P0103, P0122, P0123, P0222, P0223, P1104, P16F3, P2100, P2101, P2102, P2103, P2135 are not set.
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The system voltage is between 10-32 V.
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Engine run time greater than 2.5 minutes.
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Fuel composition is less than or equal to 87 percent ethanol.
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DTCs P0134 and P0140 run continuously when the above conditions are met.
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| Conditions for Setting the DTC |
P0131, P0137
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The ECM detects that the HO2S Voltage parameter is less than 50 mV.
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DTC sets within 50 s when the above condition is met.
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P0132, P0138
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The ECM detects that the HO2S parameter is more than 1,500 mV.
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DTC sets within 15 s when the above condition is met.
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P0134, P0140
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The ECM detects that the HO2S voltage parameter is greater than 1700 mV.
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DTC P0137 sets within 15 s when the above condition is met.
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| Action Taken When the DTC Sets |
DTCs P0131, P0132, P0134, P0137, P0138 and P0140 are Type B DTCs.
| Conditions for Clearing the MIL/DTC |
DTCs P0131, P0132, P0134, P0137, P0138 and P0140 are Type B DTCs.
| Reference Information |
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
| 1. |
Ignition ON, observe the DTC information with a scan tool. Verify no B52 HO2S heater DTCs are set.
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| 2. |
If a B52 HO2S heater DTC is set, refer to
Diagnostic Trouble Code (DTC) List - Vehicle
.
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| 3. |
Engine running, observe the current scan tool B52 HO2S voltage parameter. The value should be within the range of 50-1050 mV.
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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.
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| Circuit/System Testing |
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Ignition OFF, disconnect the appropriate B52 HO2S harness connector.
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Ignition ON, observe the current HO2S voltage parameter of the scan tool. The parameter should display 1.9 V.
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If less than the specified range, test the high and low signal circuits for a short to ground. If both signal circuit test normal, replace the K20 ECM.
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Ignition ON, test for 2.5-3.0 V between the high signal circuit terminal B and ground.
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If less than the specified range, test the high signal circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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If greater than the specified range, test the high signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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Ignition OFF, connect a 3 A fused jumper wire between the high signal circuit terminal B and the low signal circuit terminal A.
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Ignition ON, verify the scan tool HO2S parameter displays 0.0 V. |
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If greater than the specified range, test the low signal circuit for an open/high resistance or for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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| 10. |
If all circuits test normal, test or replace the appropriate B52 HO2S.
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| Repair Instructions |
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For DTC P0131 and P0132, 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 . |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Heated Oxygen Sensor Replacement - Sensor 1
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Heated Oxygen Sensor Replacement - Sensor 2
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Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing a HO2S.
Control Module References for replacement, programming, and set up
