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 1DTC P0036: HO2S Heater Control Circuit - Bank 1 Sensor 2
DTC P0053: HO2S Heater Resistance - Bank 1 Sensor 1
DTC P0054: HO2S Heater Resistance - Bank 1 Sensor 2
DTC P0135: HO2S Heater Performance - Bank 1 Sensor 1
DTC P0141: HO2S Heater Performance - Bank 1 Sensor 2
Diagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
HO2S Heater Voltage Supply | Open Fuse | P0030, P0036, P0050, P0053, P0054, P0056, P0059, P0060, P0135, P0141, P0155, P0161 | P0030, P0036, P0050, P0056, P0135, P0141, P0155, P0161 | -- | P0135, P0141, P0155, P0161 |
HO2S Heater Low Control | P0030, P0036, P0050, P0056 | P0030, P0036, P0050, P0053, P0054, P0056, P0059, P0060, P0135, P0141, P0155, P0161 | P0030, P0036, P0050, P0056, P0135, P0141, P0155, P0161 | P0030, P0036, P0050, P0056, P0135, P0141, P0155, P0161 | P0135, P0141, P0155, P0161 |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: 0.5-2 A | |||
HO2S Heater Low Control | 0 A | 0 A | 0 A |
HO2S Heater Voltage Supply | 0 A | 0 A | 1-2 A |
Circuit 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 sensor 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 or P0036
| • | The ignition 1 signal parameter is between 11-18 volts. |
| • | The engine speed is more than 425 RPM. |
| • | The ignition is in the Crank or Run position. |
| • | DTCs P0030 and P0036 run continuously when the above conditions are met. |
P0053 or P0054
| • | Coolant temperature DTCs is inactive. |
| • | Ignition OFF timer DTCs is inactive. |
| • | IAT monitor DTCs is inactive. |
| • | Turn the ignition OFF for more than 8 hours. |
| • | The Engine Coolant Temperature (ECT) Sensor parameter is between -30 and +45°C (-22 and +113°F) when starting the engine. |
| • | The ECT Sensor parameter minus the intake air temperature (IAT) sensor parameter is less than 8°C (14°F) when starting the engine. |
| • | The ignition voltage is less than 18 volts. |
| • | DTCs P0053 and P0054 run once per cold start when the above conditions are met. |
P0135
| • | DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1101, P1516, P2101, P2119, P2135, P2176 are not set. |
| • | The three-way catalytic monitor intrusive diagnostic tests is inactive. |
| • | The post oxygen sensor intrusive diagnostic tests is inactive. |
| • | The traction control, induction, fuel, idling, exhaust gas recirculation and engine No overspeed intrusive test is inactive. |
| • | The ignition 1 signal parameter is between 10-18 volts. |
| • | EGR valve, idling, fuel injectors and intake air output control is inactive. |
| • | The ECT sensor parameter is more than 60°C (140°F). |
| • | The MAF sensor parameter is between 5-45 g/s. |
| • | The engine run time parameter is more than 180 seconds. |
| • | The engine speed parameter is between 500-3,000 RPM. |
| • | The HO2S heater is not at the state of output control. |
| • | The HO2S Heater performance bank 1 sensor 1 resistance fault codes is inactive. |
| • | DTC P0135 runs the heater current test twice per drive cycle when the above conditions are met for 2 seconds, with a 120 second delay between each test. |
P0141
| • | DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1101, P1516, P2101, P2119, P2135, P2176 are not set. |
| • | The three-way catalytic monitor intrusive diagnostic tests is inactive. |
| • | The post oxygen sensor intrusive diagnostic tests is inactive. |
| • | The traction control, induction, fuel, idling, exhaust gas recirculation and engine No overspeed intrusive test is inactive. |
| • | The ignition 1 signal parameter is between 10-18 volts. |
| • | EGR valve, idling, fuel injectors and intake air output control is inactive. |
| • | The ECT sensor parameter is more than 60°C (140°F). |
| • | The MAF sensor parameter is between 5-45 g/s. |
| • | The engine run time parameter is more than 180 seconds. |
| • | The engine speed parameter is between 500-3,000 RPM. |
| • | The HO2S heater is not at the state of output control. |
| • | The HO2S Heater performance bank 1 sensor 2 resistance fault codes is inactive. |
| • | DTC P0141 runs the heater current test twice per drive cycle when the above conditions are met for 2 seconds, with a 120 second delay between each test. |
Conditions for Setting the DTC
P0030 or P0036
| • | The control module detects that the affected HO2S heater low control circuit is not within a specified range. |
| • | It occurs at least 20 times during the 25 tests. |
| • | DTCs P0030 and P0036 are set when the above conditions are met. |
P0053 or P0054
| • | The control module detects that the calculated HO2S heater low control circuit is not within the specified range when starting the engine. |
| • | DTCs P0053 and P0054 are set when the above condition are met. |
P0135
| • | The control module detects that the HO2S 1 heater current parameter is more than 3.125 amps or less than 0.25 amp. |
| • | DTC P0135 is set within 2 seconds during the heater current test when the above condition is met, and run two tests per trip. |
P0141
| • | The control module detects that the HO2S 2 heater current parameter is more than 3.125 amps or less than 0.25 amp. |
| • | DTC P0141 is set within 2 seconds during the heater current test when the above condition are met, and run two tests per trip. |
Action Taken When the DTC Sets
DTCs P0030, P0036, P0053, P0054, P0135 and P0141 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0030, P0036, P0053, P0054, P0135 and P0141 are Type B DTCs.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Engine Control Module Description
Electrical Information Reference
DTC Type Reference
Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Circuit/System Verification
| • | Allow the engine to reach operating temperature. With the engine running, observe the HO2S Heater parameter with a scan tool. The value should vary from below 1 amp to above 2 amps. |
| • | With the engine running at operating temperature, observe the HO2S Heater parameter with scan tool and manipulate the related harness and connectors. |
| ⇒ | If manipulation does affect the parameter, repair the harness or connector. |
Circuit/System Testing
Important: You must complete the Circuit/System Verification before proceeding with Circuit/System Testing.
- Turn the ignition OFF, disconnect the harness connector at the appropriate HO2S sensor.
- Ignition ON, verify that a test lamp illuminates between the appropriate HO2S heater voltage supply circuit terminal D and ground.
- Ignition ON, verify that a test lamp does not illuminate between the appropriate HO2S heater voltage supply circuit terminal D and the terminals listed below the appropriate HO2S heater low control circuit:
- With the engine running, leave the test lamp connected from the previous step. The lamp should flash or be ON steady.
- Ignition OFF, install a 30 amps fused jumper wire between the HO2S heater voltage supply circuit terminal D and the terminals listed below the appropriate HO2S heater low control circuit:
- With the engine running, verify the appropriate scan tool heater parameter is less than 0.1 amp.
- If the ECM and all circuits test normal, replace the appropriate HO2S.
| ⇒ | If the test lamp does not illuminate, test the HO2S heater voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal and the HO2S heater voltage supply circuit fuse is open, test all components connected to the fuse and replace as necessary. |
| • | B1S1 terminal E |
| • | B1S2 terminal C |
| • | B2S1 terminal E |
| • | B2S2 terminal C |
| ⇒ | If the lamp illuminates, test the HO2S heater low control circuit for a short to ground. If the circuit test normal, replace the ECM. |
| ⇒ | If the test lamp is not steady or flashing, test the HO2S heater low control circuit for a short to voltage or an open/high resistance. If the circuit test normal, replace the ECM. |
Important:
• The output driver should detect a short to voltage and turn OFF. If a resistance fault is present, the driver will remain ON and the scan tool will display more than 0.0 amp. When the resistance is less than 10 ohms, DTC may set. • Performing this test may set additional DTCs.
| • | B1S1 Terminal E |
| • | B1S2 Terminal C |
| • | B2S1 Terminal E |
| • | B2S2 Terminal C |
| ⇒ | If more than the specified range, test the HO2S heater voltage supply and HO2S heater low control circuits for more than 1 ohm. If the circuit test normal, replace the ECM. |
Repair Instructions
Notice: Refer to Heated Oxygen Sensor Resistance Learn Reset Notice in the Preface section.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
