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• | 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 provide an overview of each diagnostic category. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
HO2S Heater Voltage Supply | P0030, P0036, P0102, P0132, P0135, P0138, P0141, P0443, P0458, P0598, * | P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141 | P0030, P0036, P0102, P0132, P0134, P0135, P0138, P0140, P0141, P0443, P0458, P0598 | P0690 | P0135, P0141 |
HO2S Heater Control | P0030, P0036, P0053, P0054, P0135, P0141 | P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141 | P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141 | P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141 | P0135, P0141 |
HO2S High Signal | P0131, P0137 | P0132, P0134, P0138, P0140 | P0132, P0134, P0138, P0140 | P0132, P0134, P0138, P0140 | P0133, P013A, P013B, P013E, P013F, P1133, P2A00 |
HO2S Low Signal | P0131, P0137 | P0132, P0134, P0138, P0140 | P0132, P0134, P0138, P0140 | P0132, P0134, P0138, P0140 | P0133, P013A, P013B, P013E, P013F, P1133, P2A00 |
*Opens Fuse |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Engine Running Parameter Normal Range: 0.3-2.5 A | |||
Ignition Voltage | 0 A | 0 A | 0.3-2.5 A |
HO2S Heater Low Control | 0 A | 0 A | 0 A |
The 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. Each HO2S must reach operating temperature to provide an accurate voltage signal. A heating element inside each of the HO2S minimises 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.
• | The ignition voltage is greater than 11 V. |
• | Engine speed is greater than 400 RPM. |
• | DTC P0030 and P0036 run continuously when the above conditions are met. |
• | DTCsP0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0128, or P2610 are not set. |
• | The vehicle is OFF for greater than 8 h. |
• | The engine coolant temperature (ECT) and the inlet air temperature (IAT) are within 8°C (14°F). |
• | The ECT is between -30 to +45°C (-22 to +113°F). |
• | The ignition voltage is less than 32 V. |
• | The engine run time is less than 275 ms. |
• | DTC P0053 and P0054 run once per cold start-up when the above conditions are met. |
• | DTCs P0116, P0117, P0118, P0119, or P0128 are not set. |
• | The ignition voltage is between 10-32 V. |
• | The HO2S heaters are at operating temperature. |
• | The scan tool HO2S Heater device control is not active. |
• | The commanded HO2S heater duty cycle is greater than 0 percent. |
• | DTC P0135 and P0141 run twice per ignition cycle when the above conditions are met for 120 s. |
The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 7 s.
The ECM detects the HO2S heater is not within a specified resistance range at engine start-up.
The ECM detects the HO2S heater current is less than 0.30 A or greater than 2.5 A for more than 10 s.
DTC P0030, P0036, P0053, P0054, P0135, and P0141 are Type B DTCs.
DTC P0030, P0036, P0053, P0054, P0135, and P0141 are Type B DTCs.
• | If the condition is intermittent, move the related harnesses and connectors, with the engine running, while monitoring the scan tool circuit status parameters for the component. The circuit status parameters change from OK or Not Run to Malfunction if there is a condition with the circuit or a connection. |
• | An open fuse in the HO2S heater circuit may be caused by the heater element in one of the sensors. The condition may not be present until the sensor operates for a period of time. If no fault is present in the heater circuit, monitor the amperage of each heater with a scan tool to determine if one of the heater elements is the cause of the open fuse. Inspect the sensor pigtail or the harness for contacting the exhaust system. |
Hybrid Modes of Operation Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
• | HO2S 1 or 2 Heater Control Circuit Low Voltage Test Status |
• | HO2S 1 or 2 Heater Control Circuit Open Test Status |
• | HO2S 1 or 2 Heater Control Circuit High Voltage Test Status |
Each parameter should display OK or Not Run. |
⇒ | If movement affects the parameter, repair the appropriate harness or connector. |
• | B52 HO2S 1 terminal 1 |
• | B52 HO2S 2 terminal D |
⇒ | 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 ignition voltage circuit fuse is open, test all components connected to the ignition voltage circuit and replace as necessary. |
⇒ | If not the specified value, test the heater control circuit terminal listed below for a short to ground, or for a short to voltage. If the circuit tests normal, replace the K20 ECM. |
• | B52 HO2S 1 terminal 2 |
• | B52 HO2S 2 terminal E |
⇒ | If not the specified value, test the heater control circuit terminal listed below for an open/high resistance. If the circuit tests normal, replace the K20 ECM. |
• | B52 HO2S 1 terminal 2 |
• | B52 HO2S 2 terminal E |
• | B52 HO2S 1 ignition voltage circuit terminal 1 to control circuit terminal 2 |
• | B52 HO2S 2 ignition voltage circuit terminal D to control circuit terminal E |
⇒ | 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. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing a HO2S. |
• | Control Module References for ECM replacement, setup, and programming |
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