Oxygen Sensor Regulation In Center Three Way Catalytic Converter, Checking
Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the Oxygen Sensor (O2S) 2 in center Three Way Catalytic Converter (TWC) -G465-.
Special tools and workshop equipment required
- Multimeter.
- Wiring diagram.
Test requirements
- Fuse 21 in Fuse Panel B is OK.
- Engine Control Module (ECM) -J623- 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.
- Ignition switched off.
Test procedure
-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .
Start diagnosis
-- Perform the function test in Diagnostic Mode 06.
If specified values are obtained:
-- Check for possible intermittent connection or rub through of harness.
If the specified value was Not obtained:
Checking primary voltage
-- Disconnect the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G465- electrical harness connector.
-- Switch the ignition on.
-- Using a multimeter, check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G465- electrical harness connector terminals 3 to 4 for voltage.
Specified value: 0.400 to 0.500 Volts
-- Switch the ignition off.
If the specified value was obtained:
-- Replace the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G465-. Refer to the Repair Manual.
If the specified value was Not obtained:
Checking wiring
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-. Refer to the Repair Manual.
-- Using a multimeter, check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G465- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T94 terminals for resistance.
| Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G465- electrical harness connector terminals | Engine Control Module (ECM) -J623- electrical connector T94 terminals or test box sockets |
|---|---|
| 3 | 34 |
| 4 | 62 |
Specified value: 1.5 Ω Max.
If the specified value was Not obtained:
-- Check the wiring for an open, high resistance, short circuit to each other, Battery (+), and Ground (GND).
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring:
-- Erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
-- Perform a road test to verify active fault.
If the DTC does Not return:
Generate readiness code. Refer to READINESS CODE .
If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:
-- Replace the Engine Control Module (ECM) -J623-. Refer to the Repair Manual.
-- Assembly is performed in the reverse of the removal.
Final procedures
After 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 .