Oxygen Sensor Behind Catalytic Converter, Checking
Oxygen Sensor Behind Catalytic Converter, Checking
Observe all safety precautions: => [ Safety Precautions ] Safety Precautions
View clean working conditions: => [ Clean Working Conditions ] Clean Working Conditions
Prior to repair work, perform a preliminary check to verify the condition. Refer to => [ Preliminary Check ] Preliminary Check.
Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.
For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.
• When servicing terminals in harness connector of Heated Oxygen Sensor (HO2S) (-G130-) , use only gold-plated terminals.
Special tools, testers and auxiliary items required
• Multimeter
• Wiring diagram
Test requirements
• Fuse for Heated Oxygen Sensor (HO2S) (-G130-) OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window defroster, switched off.
• A/C switched off.
• Ground connections between engine/transmission/chassis OK.
• Exhaust system properly sealed.
Function test
- Connect the scan tool.
- Start engine and let it run at idle.
- Select Diagnostic mode 6.
- Select "Test-ID 01: Heated Oxygen Sensor". Refer to test: Monitor-ID $02: Oxygen Sensor Monitor Bank 1- Sensor 2=> [ Monitor-ID $02: Oxygen Sensor
Monitor Bank 1- Sensor 2 ] Diagnostic Modes 01 - 09.
- Switch ignition Off.
If the Monitor Failed:
Checking heater resistance
- Disconnect the Heated Oxygen Sensor (HO2S) (-G130-) electrical harness connector - 3 - located on undercarriage left side frame rail.
- Using a multimeter, measure the resistance from terminal 3 to terminal 4 of the Heated Oxygen Sensor (HO2S) (-G130-) connector.
Specified value: 2 - 4 ohms with the exhaust system at room temperature
If the specified value was Not obtained:
- Replace the Heated Oxygen Sensor (HO2S) (-G130-). Refer to the Repair Information.
If the specified value was obtained:
Checking heater voltage
- Disconnect the Heated Oxygen Sensor (HO2S) (-G130-) electrical harness connector.
- Switch ignition On.
- Using a multimeter, measure the voltage from terminal 4 of the Heated Oxygen Sensor (HO2S) (-G130-) harness connector to ground.
Specification: near Battery voltage
- Switch ignition Off.
If specified value is Not obtained:
- Check for an open, short to ground or high resistance between terminal 4 of the Heated Oxygen Sensor (HO2S) (-G130-) and fuse 21 (2010 Models) or fuse 4 (2011 Models) in Fuse Box B. Refer to Wiring Diagrams for fuse locations.
- If necessary, repair the wiring connection.
If the specified value was obtained:
Checking HO2S voltage
- Disconnect the Heated Oxygen Sensor (HO2S) (-G130-) electrical harness connector.
- Switch ignition on.
- Using a multimeter, measure the voltage from terminal 3 of the Heated Oxygen Sensor (HO2S) (-G130-) harness connector to ground.
Specification: Near 4.76 V
- Using a multimeter, measure the voltage from terminal 1 of the Heated Oxygen Sensor (HO2S) (-G130-) harness connector to ground.
Specification: Near 2.85 V
- Using a multimeter, measure the voltage from terminal 5 of the Heated Oxygen Sensor (HO2S) (-G130-) harness connector to ground.
Specification: Near 2.85 V
- Using a multimeter, measure the voltage from terminal 2 of the Heated Oxygen Sensor (HO2S) (-G130-) harness connector to ground.
Specification: Near 2.50 V
- Using a multimeter, measure the voltage from terminal 6 of the Heated Oxygen Sensor (HO2S) (-G130-) harness connector to ground.
Specification: Near 2.93 V
- Switch ignition off.
If any of the specified values were Not obtained:
Checking wiring
- Remove the Engine Control Module (ECM) (J623). Refer to the service information for removal and installation procedures.
- Using a multimeter, check the Heated Oxygen Sensor (HO2S) (-G130-) electrical harness connector terminals to the Engine Control Module (ECM) (J623) electrical connector T94 for an open circuit. Refer to Wiring Diagrams for pin locations.
Specified resistance 1.5 ohms max.
If the specification is Not obtained:
- Check the wiring for high resistance, an open or short circuit to Battery or ground.
- If necessary, repair the wiring connection.
If no malfunctions are found in wiring and the voltage was Not OK:
- Replace the Engine Control Module (ECM) (J623). Refer to the Repair Information.
Final procedures
After repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 09.
2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.
3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.