Sfi System - P0058

1. Description

2. Monitor description

3. Monitor strategy

4. Typical enabling conditions

5. Typical malfunction thresholds

6. Component operating range

7. Monitor result

8. Wiring diagram

9. Inspection procedure

10. Inspect heated oxygen sensor (heater resistance)

11. Inspect efi relay

12. Inspect ecm (ht1b or ht2b voltage)

13. Check harness and connector (heated oxygen sensor - ecm, heated oxygen sensor - efi relay)

DTC P0037 Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2)

DTC P0038 Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2)

DTC P0057 Oxygen Sensor Heater Control Circuit Low (Bank 2 Sensor 2)

DTC P0058 Oxygen Sensor Heater Control Circuit High (Bank 2 Sensor 2)

HINT:

Sensor 2 refers to the sensor mounted behind the Three-Way Catalytic Converter (TWC) and located furthest from the engine assembly.

DESCRIPTION

HINT:

1. When any of these DTCs are set, the ECM enters fail-safe mode. The ECM turns off the Heated Oxygen (HO2) sensor heater in fail-safe mode. Fail-safe mode continues until the ignition switch is turned off.
   
2. The ECM provides a pulse width modulated control circuit to adjust the current through the heater. The HO2 sensor heater circuit uses a relay on the B+ side of the circuit.
   

HINT:

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

MONITOR DESCRIPTION

1. The ECM sets DTC P0038 or P0058 when the current in the HO2 sensor heater is more than 2 A. Conversely, when the heater current is less than 0.3 A, DTC P0037 or P0057 is set.
   

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

MONITOR RESULT

1. TID (Test Identification Data) is assigned to each emissions-related component.
   
2. TLT (Test Limit Type):
   If TLT is 0, the component is malfunctioning when the test value is higher than the test limit.
   If TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
   
3. CID (Component Identification Data) is assigned to each test value.
   
4. Unit Conversion is used to calculate the test value indicated on generic OBD ll scan tools.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

1. 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.
   
2. Read freeze frame data using the intelligent tester. 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.
   

1. Disconnect the H6 or H8 Heated Oxygen (HO2) sensor connector.

2. Measure the resistance between the terminals of the HO2 sensor connector.
   

   Standard resistance:

   Bank 1:

   Tester Connections	Specified Conditions
   HT (1) - +B (2)	11 to 16 Ω at 20°C (68°F)
   HT (1) - E (4)	10 kΩ or higher

   Bank 2:

   Tester Connections	Specified Conditions
   HT (1) - +B (2)	11 to 16 Ω at 20°C (68°F)
   HT (1) - E (4)	10 kΩ or higher

3. Reconnect the HO2 sensor connector.

NG	REPLACE HEATED OXYGEN SENSOR

OK

1. Remove the EFI relay from the engine room R/B.

2. Measure the EFI relay heater relay resistance.

   Standard resistance:

   Tester Connections	Specified Conditions
   3 - 5	10 kΩ or higher
   3 - 5	Below 1 Ω (when battery voltage applied to terminals 1 and 2

3. Reinstall the EFI relay.

NG	REPLACE EFI RELAY

OK

1. Turn the ignition switch on.

2. Measure the voltage between the terminals of the E4, E5 and E6 ECM connector.

   Standard voltage:

   Tester Connections	Specified Conditions
   HA1B (E4-1) - E1 (E6-1)	9 to 14 V
   HA2B (E5-5) - E1 (E6-1)	9 to 14 V

   HINT:

   1. The HT1B means the heated oxygen sensor bank 1 sensor 2.
      
   2. The HT2B means the heated oxygen sensor bank 2 sensor 2.
      

OK	REPLACE ECM

NG

1. Check the harness and the connector between the ECM and the HO2 sensor.

   1. Disconnect the H6 or H8 HO2 sensor connector.

   2. Disconnect the E4 or E5 ECM connector.

   3. Measure the resistance.

      Standard resistance (Check for open):

      Tester Connections	Specified Conditions
      HT (H6-1) - HT1B (E4-1)	Below 1 Ω
      HT (H8-1) - HT2B (E5-5)	Below 1 Ω

      Standard resistance (Check for short):

      Tester Connections	Specified Conditions
      HT (H6-1) or HT1B (E4-1) - Body ground	10 kΩ or higher
      HT (H8-1) or HT2B (E5-5) - Body ground	10 kΩ or higher

2. Check the harness and the connector between the HO2 sensor and EFI relay.

   1. Inspect the EFI No. 2 fuse

      1. Remove the EFI No. 2 fuse from engine room R/B.
         
      2. Check the EFI No. 2 fuse resistance.
         

         Standard resistance:

         Below 1 Ω
         

   2. Measure the resistance.

      1. Remove the engine room junction block.
         

         Standard resistance (Check for open)::

         Tester Connections	Specified Conditions
         +B (H6-2) - EFI relay (3)	Below 1 Ω
         +B (H8-2) - EFI relay (3)	Below 1 Ω

         Standard resistance (Check for short)::

         Tester Connections	Specified Conditions
         +B (H6-2) or EFI relay (3) - Body ground	10 kΩ or higher
         +B (H8-2) or EFI relay (3) - Body ground	10 kΩ or higher

   3. Reconnect the HO2 sensor connector.

   4. Reconnect the ECM connector.

   5. Reinstall the EFI relay.

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE ECM