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Powertrain Management (Heavy Duty L96)




DTC P0134, P0140, P0154, or P0160 (Heavy Duty L96)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P0134

-
HO2S Circuit Insufficient Activity Bank 1 Sensor 1

DTC P0140

-
HO2S Circuit Insufficient Activity Bank 1 Sensor 2

DTC P0154

-
HO2S Circuit Insufficient Activity Bank 2 Sensor 1

DTC P0160

-
HO2S Circuit Insufficient Activity Bank 2 Sensor 2

Diagnostic Fault Information






Typical Scan Tool Data






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 0-1,000 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

* DTCs P0068, P0101, P0102, P0103, P0122, P0123, P0178, P0179, P0222, P0223, P1104, P16F3, P2100, P2101, P2102, P2103, P2135, P2269 are not set.

* The ignition voltage is between 10-32 V.

* The engine run time is greater than 225 s.

* The fuel system is in Closed Loop.

* All cylinders are active.

* The fuel alcohol content is less than 87 percent ethanol.

* The DTCs run continuously when the above conditions are met.

Conditions for Setting the DTC

P0134, P0140, P0154 or P0160

The ECM detects that the HO2S voltage is greater than 1700 mV for more than 250 ms.

Action Taken When the DTC Sets

DTCs P0134, P0140, P0154, and P0160 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0134, P0140, P0154, and P0160 are Type B DTCs.

Diagnostic Aids

This ECM uses a bias voltage on the high and low signal circuits of the HO2S. The voltage measured between the high and low signal HO2S terminals is approximately 1,900 mV. The voltage measured between the low signal HO2S terminal and ground varies based on the temperature of the HO2S and will typically be between 0 and 1,000 mV, under normal operating conditions. The value of the high signal circuit when measured to ground will be approximately equal to the voltage measured between ground and the low signal circuit plus 1,900 mV.

Reference Information

Schematic Reference

Engine Controls Schematics (except L96) [1][2]Electrical DiagramsEngine Controls Schematics (L96) [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool. Verify no HO2S heater DTCs are set.

• If a HO2S heater DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

2. Run the engine for more than 5 minutes.

3. Engine idling at operating temperature, observe the appropriate B52 HO2S parameter with a scan tool. The reading should vary between 50-1,050 mV.

4. 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

1. Ignition OFF, disconnect the harness connector at the appropriate B52 HO2S.

2. Ignition ON, observe the appropriate scan tool HO2S voltage parameter. The parameter should display 1,900 mV.

• 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.

3. Ignition ON, test for 1,900-3,000 mV between the high signal circuit terminal B and ground.

• 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.

• 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.

4. Ignition OFF, connect a 3 A fused jumper wire between the high signal circuit terminal B and the low signal circuit terminal A.

Note:
The low signal circuit is tied to a pull-up circuit within the ECM. A voltage of 900-1,100 mV on the low signal circuit is normal.

5. Ignition ON, verify the scan tool HO2S parameter displays 0.0 mV.

• 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.

6. If all circuits test normal, test or replace the appropriate B52 HO2S.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (2500 Series - Cab/Chassis) Service and RepairHeated Oxygen Sensor Replacement - Bank 1 Sensor 1 (2500 Series) Service and RepairHeated Oxygen Sensor Replacement - Bank 1 Sensor 1 (1500 Series) Service and Repair

* Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (1500 Series) Service and RepairHeated Oxygen Sensor Replacement - Bank 1 Sensor 2 (2500 Series - Cab/Chassis) Service and RepairHeated Oxygen Sensor Replacement - Bank 1 Sensor 2 (2500 Series) Service and Repair

* Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (1500 Series) Service and RepairHeated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series - Cab/Chassis) Service and RepairHeated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series) Service and Repair

* Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (1500 Series) Service and RepairHeated Oxygen Sensor Replacement - Bank 2 Sensor 2 (2500 Series) Service and RepairHeated Oxygen Sensor Replacement - Bank 2 Sensor 2 (2500 Series - Cab/Chassis) Service and Repair

* Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing a HO2S.

* Control Module References Control Module References for ECM replacement, setup, and programming

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