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C-022 O2 Sensor Heater Circuit (Before Catalyst) > < C-020 O2 Sensor Circuit (Before Catalyst)

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C-021 - O2 Sensor Heater Circuit (Bank 1, Sensor 2)

Test

Work Order Description

Nominal Value
T001

Check: Interruption of Voltage Supply Circuit
  • Ignition OFF
  • Disconnect wiring harness connector from:
    B57 Sensor - Oxygen, Catalytic Converter Check
  • Remove electrical component from socket:
    K2_X125 Relay - Engine Control Unit
  • Connect fused jumper wire to:
    K2_X125 Relay - Engine Control Unit
    Socket Terminal 87
    &
    Battery voltage
  • Measure voltage between the following terminals:
    B57 Sensor - Oxygen, Catalytic Converter Check
    Wiring harness connector (wiring harness side) terminal 1
    &
    Ground

greater than 11 V
Voltage Measurement Current Value: V
Yes: No:
T002

Check: Short to Voltage of Ground Circuit
  • Remove fused jumper wire
  • Remove electrical component from socket:
    K12_X125 Relay - Radiator Fan
  • Disconnect wiring harness connector from:
    A84 Control Unit - Engine
    (Wiring Harness Connector (XC7) )
  • Ignition ON
  • Measure voltage between the following terminals:
    B57 Sensor - Oxygen, Catalytic Converter Check
    Wiring harness connector (wiring harness side) terminal 2
    &
    Ground

less than 0.3 V
Voltage Measurement Current Value: V
Yes: No:
T003

Check: Component
  • Ignition OFF
  • Measure resistance between the following terminals:
    B57 Sensor - Oxygen, Catalytic Converter Check
    Wiring harness connector (component side) terminal 1
    &
    B57 Sensor - Oxygen, Catalytic Converter Check
    Wiring harness connector (component side) terminal 2

4 ... 12 Ohm
Resistance Measurement Current Value: Ohm
Yes: No:
T004

Check: Component
  • Measure resistance between the following terminals:
    B57 Sensor - Oxygen, Catalytic Converter Check
    Wiring harness connector (component side) terminal 1
    &
    Ground

greater than 500 kOhm
Resistance Measurement Current Value: kOhm
Yes: No:
T005

Check: Component
  • Ignition OFF
  • Measure resistance between the following terminals:
    B57 Sensor - Oxygen, Catalytic Converter Check
    Wiring harness connector (component side) terminal 1
    &
    B57 Sensor - Oxygen, Catalytic Converter Check
    Wiring harness connector (component side) terminal 2

greater than 12 Ohm
Resistance Measurement Current Value: Ohm
Yes: No:


Result

Cause Of Fault
E001 Result: Short to Ground/Interruption
  • Short circuit to ground/interruption of circuit between:
    A84 Control Unit - Engine
    Wiring harness connector (wiring harness side) terminal 35 (XC7)
    &
    B57 Sensor - Oxygen, Catalytic Converter Check
    Wiring harness connector (wiring harness side) terminal 2

or

  • Defective component:
    A84 Control Unit - Engine

Important:

Reset the concerned control unit with the diagnostic tester before replacing it. In order to do that, call up the "RESET" function from the PROGRAMMING menu of the current system on the diagnostic tester.
E002 Result: Short to Ground
  • Short circuit to ground between:
    B57 Sensor - Oxygen, Catalytic Converter Check
    Wiring harness connector (component side) terminal 1
    &
    B57 Sensor - Oxygen, Catalytic Converter Check
    Wiring harness connector (component side) terminal 2

or

  • Defective component:
    B57 Sensor - Oxygen, Catalytic Converter Check
E003 Result: Interruption
  • Circuit interruption between:
    B57 Sensor - Oxygen, Catalytic Converter Check
    Wiring harness connector (component side) terminal 1
    &
    B57 Sensor - Oxygen, Catalytic Converter Check
    Wiring harness connector (component side) terminal 2

or

  • Defective component:
    B57 Sensor - Oxygen, Catalytic Converter Check
E004 Result: Short Circuit in Wiring Harness
  • Short circuit in wiring harness between:
    B57 Sensor - Oxygen, Catalytic Converter Check
    Wiring harness connector (component side) terminal 1
    &
    B57 Sensor - Oxygen, Catalytic Converter Check
    Wiring harness connector (component side) terminal 2

or

  • Defective component:
    B57 Sensor - Oxygen, Catalytic Converter Check
E005 Result: Short to Voltage
  • Short circuit to voltage between:
    A84 Control Unit - Engine
    Wiring harness connector (wiring harness side) terminal 35 (XC7)
    &
    B57 Sensor - Oxygen, Catalytic Converter Check
    Wiring harness connector (wiring harness side) terminal 2
E006 Result: Interruption
  • Circuit interruption between:
    X125 Underhood Electronic Module
    Wiring harness connector (wiring harness side) terminal 29 (XE3)
    &
    B57 Sensor - Oxygen, Catalytic Converter Check
    Wiring harness connector (wiring harness side) terminal 1

or

  • Defective component:
    X125 Underhood Electronic Module

Important:

Reset the concerned control unit with the diagnostic tester before replacing it. In order to do that, call up the "RESET" function from the PROGRAMMING menu of the current system on the diagnostic tester.





C-022 O2 Sensor Heater Circuit (Before Catalyst) > < C-020 O2 Sensor Circuit (Before Catalyst)