SFI SYSTEM, Diagnostic DTC:P0037, P0038, P102D

DESCRIPTION

Refer to DTC P0136 Click here.

MONITOR DESCRIPTION

The sensing portion 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 and P102D):
  

  • The ECM monitors the current applied to the heated oxygen sensor heater to check the heater for malfunctions.

    If the heater current is outside the normal range, the signal transmitted by the heated oxygen sensor becomes inaccurate. When the current in the heated oxygen sensor heater is outside the normal operating range, the ECM interprets this as a malfunction in the sensor heater and stores a DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

CONFIRMATION DRIVING PATTERN

1. Connect the GTS to the DLC3.

2. Turn the ignition switch to ON (IG) and turn the GTS on.

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

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

5. Turn the ignition switch to ON (IG) and turn the GTS on [A].

6. Put the engine in inspection mode (maintenance mode) Click here.

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

8. With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 2500 rpm for 1 minute [C].

   Tech Tips

   During charging control, the engine speed is set at idle. Therefore, the engine speed does not increase when depressing the accelerator pedal. In this case, perform steps [C] and [D] after charging control has completed.

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

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

11. Read the pending DTCs.

    Tech Tips

    
    

    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

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

13. Input the DTC: P0037, P0038 or P102D.

14. Check the DTC judgment result.

    GTS Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips

    
    

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [E] again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

   
   

   1. Inspect the heated oxygen sensor Click here.

   
   

   NG

   REPLACE HEATED OXYGEN SENSOR Click here

   OK

2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF HEATED OXYGEN SENSOR)

   
   
   1. 

      Text in Illustration

      *a	Front view of wire harness connector (to Heated Oxygen Sensor)

      Disconnect the heated oxygen sensor connector.

   2. Turn the ignition switch to ON (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition C16-2 (+B) - Body ground Ignition switch ON (IG) 11 to 14 V

   
   

   NG

   CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - NO. 1 INTEGRATION RELAY) Click here

   OK

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

   
   

   1. Disconnect the C16 heated oxygen sensor connector.

   2. Disconnect the C10 ECM connector (for LHD).

   3. Disconnect the C9 ECM connector (for RHD).

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

      Standard Resistance
      for LHD Tester Connection Condition Specified Condition C16-1 (HT1B) - C10-22 (HT1B) Always Below 1 Ω C16-1 (HT1B) or C10-22 (HT1B) - Body ground Always 10 kΩ or higher
      for RHD Tester Connection Condition Specified Condition C16-1 (HT1B) - C9-22 (HT1B) Always Below 1 Ω C16-1 (HT1B) or C9-22 (HT1B) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0037, P0038 OR P102D)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON (IG).

   3. Turn the GTS on.

   4. Clear the DTCs Click here.

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

   6. Turn the ignition switch to ON (IG).

   7. Turn the GTS on.

   8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

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

   10. Read the DTCs.

       Result

       Result	Proceed to
       DTC is not output	A
       DTC P0037, P0038 or P102D is output	B

   
   

   A

   CHECK FOR INTERMITTENT PROBLEMS Click here

   B

   REPLACE ECM Click here

5. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - NO. 1 INTEGRATION RELAY)

   
   

   1. Disconnect the C16 heated oxygen sensor connector.

   2. Remove the No. 1 integration relay from the No. 2 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition C16-2 (+B) - 2C-4 Always Below 1 Ω C16-2 (+B) or 2C-4 - Body ground Always 10 kΩ or higher

   
   

   OK

   REPLACE NO. 1 INTEGRATION RELAY Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR