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DTC P0030, P0036, P0050, P0053, P0054, P0056, P0059, P0060, P0135, P0141, P0155, or P0161 (LF1, LFW)

DTC P0030, P0036, P0050, P0053, P0054, P0056, P0059, P0060, P0135, P0141, P0155, or P0161 (LF1, LFW)

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 P0030

HO2S Heater Control Circuit Bank 1 Sensor 1

DTC P0036

HO2S Heater Control Circuit Bank 1 Sensor 2

DTC P0050

HO2S Heater Control Circuit Bank 2 Sensor 1

DTC P0053

HO2S Heater Resistance Bank 1 Sensor 1

DTC P0054

HO2S Heater Resistance Bank 1 Sensor 2

DTC P0056

HO2S Heater Control Circuit Bank 2 Sensor 2

DTC P0059

HO2S Heater Resistance Bank 2 Sensor 1

DTC P0060

HO2S Heater Resistance Bank 2 Sensor 2

DTC P0135

HO2S Heater Performance Bank 1 Sensor 1

DTC P0141

HO2S Heater Performance Bank 1 Sensor 2

DTC P0155

HO2S Heater Performance Bank 2 Sensor 1

DTC P0161

HO2S Heater Performance Bank 2 Sensor 2

Diagnostic Fault Information

Circuit Short to Ground High Resistance Open Short to Voltage Signal Performance
HO2S High Signal P0131, P0137, P0151, P0157 P0132, P0134, P0138, P0140, P0152, P0154, P0158, P0160 P0132, P0134, P0138, P0140, P0152, P0154, P0158, P0160 P0132, P0134, P0138, P0140, P0152, P0154, P0158, P0160 P0133, P013A, P013B, P013C, P013D, P013E, P013F, P014A, P014B, P0153, P1133, P1153, P2A00, P2A03
HO2S Low Signal P0131, P0137, P0151, P0157 P0132, P0134, P0138, P0140, P0152, P0154, P0158, P0160 P0132, P0134, P0138, P0140, P0152, P0154, P0158, P0160 P0132, P0134, P0138, P0140, P0152, P0154, P0158, P0160 P0133, P013A, P013B, P013C, P013D, P013E, P013F, P014A, P014B, P0153, P1133, P1153, P2A00, P2A03
HO2S Heater Voltage Supply P0030, P0036, P0050, P0056, P0132, P0135, P0138, P0141, P0152, P0155, P0158, P0161, * P0030, P0036, P0050, P0056, P0132, P0134, P0135, P0138, P0140, P0141, P0152, P0154, P0155, P0158, P0160, P0161 P0030, P0036, P0050, P0056, P0132, P0134, P0135, P0138, P0140, P0141, P0152, P0154, P0155, P0158, P0160, P0161 P0690 P0135, P0141, P0155, P0161
HO2S Heater Control P0030, P0036, P0050, P0053, P0054, P0056, P0059, P0060, P0135, P0141, P0155, P0161 P0030, P0036, P0050, P0056, P0132, P0134, P0135, P0138, P0140, P0141, P0152, P0154, P0155, P0158, P0160, P0161 P0030, P0036, P0050, P0056, P0132, P0134, P0135, P0138, P0140, P0141, P0152, P0154, P0155, P0158, P0160, P0161 P0030, P0036, P0050, P0056, P0132, P0134, P0135, P0138, P0140, P0141, P0152, P0154, P0155, P0158, P0160, P0161 P0135, P0141, P0155, P0161
* Opens Fuse


Typical Scan Tool Data

HO2S Sensor 1 Current/HO2S Sensor 2 Current

Circuit Short to Ground Open Short to Voltage
Parameter Normal Range: 0.2-1.5 A
HO2S Heater Low Control 0 A 0 A 0 A
HO2S Heater Voltage Supply 0 A 0 A 0.2-1.5 A


Circuit/System Description

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.

Conditions for Running the DTC


P0030, P0036, P0050, or P0056

• The ignition 1 voltage is between 11-18 V.

• The engine speed is greater than 400 RPM.

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



P0053, P0054, P0059, or P0060

• DTCs P0112, P0113, P0117, P0118, or P2610 are not set.

• The engine run time is greater than 20 s.

• The ignition voltage is less than 18 V.

• The ignition is OFF for greater than 8 h.

• The engine coolant temperature (ECT) is between -30 to +45°C (-22 to +113°F) at engine start-up.

• The ECT and the intake air temperature (IAT) are within 8°C (14°F) at engine start-up.

• The DTCs run once per drive cycle when the above conditions are met.



P0135, P0141, P0155, or P0161

• DTCs P0116, P0117, P0118, P0125, or P0128 are not set.

• The ignition 1 voltage is between 10-32 V.

• The HO2S is at operating temperature.

• The HO2S is commanded ON.

• The DTCs run once per drive cycle when the above conditions are met for 120 s.


Conditions for Setting the DTC

P0030, P0036, P0050, or P0056

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 5 s.

P0053, P0054, P0059, or P0060

The ECM detects the HO2S heater is not within a specified resistance range at engine start-up.

P0135 or P0155

The ECM detects that the HO2S 1 heater current is greater than 3.1 amps, or less than 0.3 amps for greater than 8 s.

P0141 or P0161

The ECM detects that the HO2S 2 heater current is greater than 2.9 amps, or less than 0.3 amps for greater than 8 s.

Action Taken When the DTC Sets

DTCs P0030, P0036, P0050, P0053, P0054, P0056, P0059, P0060, P0135, P0141. P0155, and P0161 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0030, P0036, P0050, P0053, P0054, P0056, P0059, P0060, P0135, P0141. P0155, and P0161 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics (3.0L (LF1)) Engine Controls Schematics (2.8L (LAU))

Connector End View Reference

Component Connector End Views

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs

• Heated Oxygen Sensor Wiring Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Engine idling, command the appropriate B52 HO2S heater ON and OFF with a scan tool while observing the B52 HO2S Heater Circuit Test Status parameter. The parameter should display OK or Not Run.

2. Engine idling at operating temperature, observe the scan tool B52 HO2S Heater parameter . The amperage should be within 0.2-1.5 A.

3. Engine idling at operating temperature, move the related wiring and connectors while observing the B52 HO2S Heater parameter with a scan tool. The parameter should not change with movement.

4. If movement affects the parameter, repair the appropriate harness or connector.

5. 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, verify that a test lamp illuminates between the ignition voltage circuit terminal D and ground.

3. If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B52 HO2S heater circuit fuse is open, test all components connected to the fuse and replace as necessary.

4. Ignition ON, observe the appropriate scan tool HO2S Heater Control Open Circuit Test Status parameter. The parameter should display Malfunction.

5. If not the specified value, test the heater control circuit terminal E for a short to ground, or for a short to voltage. If the circuit tests normal, replace the K20 ECM.

6. Connect a 3 A fused jumper wire between the heater control circuit terminal E and ground. Observe the appropriate scan tool HO2S Heater Control Circuit Low Voltage Test Status parameter. The parameter should transition from OK to Malfunction.

7. If not the specified value, test the heater control circuit terminal E for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

8.
Note
• Less than 10 Ω of additional resistance on the ignition voltage circuit, or control circuit may set a DTC. If there is resistance on a circuit, the driver will remain ON and the scan tool HO2S High Voltage Test Status parameter will display OK.

• Performing this test may set additional DTCs.


Ignition OFF, connect a 10 A fused jumper wire between the control circuit terminal E and the ignition voltage circuit terminal D.

9. Engine idling, observe the appropriate HO2S Control Circuit High Voltage Test Status parameter. The parameter should transition from Not Run to Malfunction.

10. If not the specified value, test the control circuit and the ignition voltage circuit for high resistance. If the circuits test normal, replace the K20 ECM.

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


Repair Instructions

Refer to Heated Oxygen Sensor Resistance Learn Reset Caution .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (LF1)

• Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (LF1)

• Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (LF1)

• Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LF1)

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