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P0037





2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0037, P0038, P0057, P0058, P0141, P0161, P102D, P105D: Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2)


CAUTION / NOTICE / HINT

HINT
Sensor 2 refers to the sensor mounted behind the three-way catalytic converter and located furthest from the engine assembly.

DESCRIPTION

Refer to DTC P0136 P0136.

HINT
When any of these DTCs are set, the ECM enters fail-safe mode. The ECM turns off the heated oxygen sensor heater in fail-safe mode. Fail-safe mode continues until the ignition switch is turned off.









HINT
* Bank 1 refers to the bank that includes cylinder No. 1.
* Bank 2 refers to the bank that does not include cylinder No. 1.
* Sensor 1 refers to the sensor closest to the engine assembly.
* Sensor 2 refers to the sensor furthest away from the engine assembly.

MONITOR DESCRIPTION

The sensing position of the heated oxygen sensor has a zirconia element which is used to detect the oxygen concentration in the exhaust gas. If the zirconia element is at the appropriate temperature, and the difference between the oxygen concentrations surrounding the inside and outside surfaces of the sensor is large, the zirconia element generates voltage signals. In order to increase the oxygen concentration detecting capacity of the zirconia element, the ECM supplements the heat from the exhaust with heat from a heating element inside the sensor.

Heated oxygen sensor heater range check (P0037, P0038, P0057 and P0058):

- The ECM monitors the current applied to the heated oxygen sensor heater to check the heater for malfunctions. If the current is below the threshold value, the ECM will determine that there is an open circuit in the heater. If the current is above the threshold value, the ECM will determine that there is a short circuit in the heater.

Example:

- The ECM sets DTC P0038 or P0058 when the current in the heated oxygen sensor heater is more than 2 A. Conversely, when the heater current is less than 0.3 A, DTC P0037 or P0057 is set.

Heated oxygen sensor heater performance (P0141 and P0161):

- After the accumulated heater ON time exceeds 100 seconds, the ECM calculates the heater resistance using the battery voltage and the current applied to the heater. If the resistance is above the threshold value, the ECM will determine that there is a malfunction in the heated oxygen sensor heater and set DTC P0141 and P0161.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All:





P0037 and P0057:





P0038 and P0058 (Case 1):





P0038 and P0058 (Case 2):





P0141 and P0161:





P102D and P105D:





HINT
When the values for the Data List items. O2 Heater Curr Val B1S2 and O2 Heater Curr Val B2S2 are not 0 A, the heater is on.

TYPICAL MALFUNCTION THRESHOLDS

P0037 and P0057:





P0038 and P0058:





P0141 and P0161 (Heater performance monitor check):





P102D and P105D:





COMPONENT OPERATING RANGE





MONITOR RESULT

Refer to CHECKING MONITOR STATUS Mode 6 Data.

WIRING DIAGRAM

Refer to DTC P0136 P0136.

CONFIRMATION DRIVING PATTERN





1. Connect the Techstream to the DLC3.

2. Turn the ignition switch on (IG) and turn the Techstream on.

3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

4. Turn the ignition switch off and wait for at least 30 seconds.

5. Turn the ignition switch on (IG) and turn the Techstream on [A].

6. Start the engine and idle it for 5 minutes or more [B].

7. With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 3000 rpm for 1 minute [C].

8. Idle the engine for 5 minutes or more [D].

9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].

10. Read the pending DTCs.

HINT
* If a pending DTC is output, the system is malfunctioning.
* If a pending DTC is not output, perform the following procedure.

11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

12. Input the DTC: P0037, P0038, P0057, P0058, P0141, P0161, P102D or P105D.

13. Check the DTC judgment result.





HINT
* If the judgment result shows NORMAL, the system is normal.
* If the judgment result shows ABNORMAL, the system has a malfunction.

14. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] through [E] again.

15. If no pending DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
* If a permanent DTC is output, the system is malfunctioning.
* If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT
* Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from the transmission.
* Bank 2 refers to the bank that does not include the No. 1 cylinder.
* If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
* Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

(a) Disconnect the heated oxygen sensor connector.





(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:

Bank 1
Bank 2










Text in Illustration





(c) Reconnect the heated oxygen sensor connector.

NG -- REPLACE HEATED OXYGEN SENSOR Components
OK -- Continue to next step.

2. CHECK TERMINAL VOLTAGE (+B TERMINAL OF HEATED OXYGEN SENSOR)

(a) Disconnect the heated oxygen sensor connector.





(b) Turn the ignition switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Standard voltage:

Bank 1
Bank 2










Text in Illustration





(d) Reconnect the heated oxygen sensor connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI RELAY - HEATED OXYGEN SENSOR)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)

(a) Disconnect the heated oxygen sensor connector.

(b) Disconnect the ECM connectors.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open):

Bank 1
Bank 2










Standard resistance (Check for short):

Bank 1
Bank 2










(d) Reconnect the ECM connectors.

(e) Reconnect the heated oxygen sensor connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - ECM)
OK -- Continue to next step.

4. CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch on (IG).

(c) Turn the tester on.

(d) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(e) Start the engine.

(f) Drive the vehicle accordance with the driving pattern described in the Confirmation Driving Pattern.

(g) Select the following menu items: Powertrain / Engine and ECT / Trouble Code.

(h) Read the DTCs.

Result:





B -- REPLACE ECM Components

A -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems
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