Heated Oxygen Sensor Heater After Three Way Catalytic Converter, Checking
Vehicle must be raised before electrical harness connector for the Oxygen Sensor After Three Way Catalytic Converter -G130- / Heater For Oxygen Sensor 1 After Catalytic Converter -Z29- is accessible.
When servicing terminals in harness connectors, use only gold-plated terminals.
Special tools and workshop equipment required
- Multimeter.
- Wiring diagram.
Test requirements
- The Fuses OK.
- Battery voltage at least 12.5 volts.
- All electrical consumers such as, lights and rear window defroster, switched off.
- Vehicles with automatic transmission, shift selector lever into position "P" or "N".
- A/C switched off.
- Ground connections between engine/transmission/chassis OK.
- Switch the Ignition Off
Test procedure
-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK
Start diagnosis
-- Remove the right vehicle floor cover.
Checking internal resistance
-- Disconnect the Oxygen Sensor After Three Way Catalytic Converter -G130- / Heater For Oxygen Sensor 1 After Catalytic Converter -Z29- electrical harness connector.
-- Using a multimeter, check the Oxygen Sensor After Three Way Catalytic Converter -G130- / Heater For Oxygen Sensor 1 After Catalytic Converter -Z29- electrical harness connector terminals 1 to 2 for resistance.
Specified value: 6.0 to 20.0 Ω (at approx. 20 °C)
If the specified value was Not obtained:
-- Replace the Oxygen Sensor After Three Way Catalytic Converter -G130- / Heater For Oxygen Sensor 1 After Catalytic Converter -Z29-
If the specified value was obtained:
Checking voltage supply
-- Switch the Ignition On
-- Using a multimeter, check the Oxygen Sensor After Three Way Catalytic Converter -G130- / Heater For Oxygen Sensor 1 After Catalytic Converter -Z29- electrical harness connector terminal 1 to engine ground.
Specified value: Battery voltage.
If the specified value was Not obtained:
-- Check the wiring for an open, high resistance, short circuit to each other, or Ground.
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
If the specified value was obtained:
Checking Ground activation
If the manufacturers test box is being used, perform the following step.
-- Install the test box.
If the manufacturers test box is not being used, perform the following step.
-- Remove the Engine Control Module (ECM) -J623-.
-- Using a multimeter, check the Oxygen Sensor After Three Way Catalytic Converter -G130- / Heater For Oxygen Sensor 1 After Catalytic Converter -Z29- electrical harness connector terminal to the Engine Control Module (ECM) -J623- electrical harness connector terminal for an open circuit according to the chart below.
| Oxygen Sensor After Three Way Catalytic Converter -G130- / Heater For Oxygen Sensor 1 After Catalytic Converter -Z29- electrical harness connector terminal: | Engine Control Module (ECM) -J623- electrical connector T94 terminal: |
|---|---|
| 2 | 7 |
Specified value: 1.5 Ω max.
If the specified value was Not obtained:
-- Check the wiring for an open or high resistance.
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
If the specified value was obtained:
If no malfunction is detected in the wiring and the voltage supply was OK:
-- Replace the Engine Control Module (ECM) -J623-.
Final procedures
-- Reinstall the right vehicle floor cover.
After the repair work, the following work steps must be performed in the following sequence:
- Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
- If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
- If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .