Ho2S Front Oxygen Sensor Bank 1 Sensor 1, Checking
The following procedure is used to diagnose both HO2S Oxygen Sensor Bank 1 Sensor 1 -G39- and HO2S Oxygen Sensor Bank 2 Sensor 1 -G108-
Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the HO2S Oxygen Sensor Bank 1 Sensor 1 -G39- and HO2S Oxygen Sensor Bank 2 Sensor 1 -G108-. No attempt should be made to repair wiring or terminals on the sensor itself. Replacement of the sensor is required in that instance.
Special tools and workshop equipment required
- Multimeter.
- Wiring diagram.
Test requirements
- Fuse -S-17- fuse OK.
- The Oxygen Sensor Heater Bank 1 Sensor 1 -Z19- has not set a code. If a heater code is set, perform the Z19 heater test first.
- 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 between catalytic converter and cylinder head properly sealed.
- Coolant Temperature at least 80° C.
Test procedure
-- Observe safety precautions. Refer to SAFETY PRECAUTIONS
-- Observe Clean Working Conditions. Refer to CLEAN WORKING CONDITIONS
-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .
Function test
-- Perform the function test in Diagnostic Mode 06. Refer to DIAGNOSTIC MODE 06 - READ TEST RESULTS FOR SPECIFIC DIAGNOSTIC FUNCTIONS .
-- Switch the ignition OFF.
If the specified values were Not obtained:
Start Diagnosis
-- Disconnect the HO2S Oxygen Sensor Bank 1 Sensor 1 -G39- electrical harness connector -2-.
Checking primary voltage
-- Switch the ignition ON.
-- Using a multimeter, check the HO2S Oxygen Sensor Bank 1 Sensor 1 -G39- electrical harness connector terminals 2 to 6 for voltage.
Specified value: 0.40 to 0.50 V
-- Switch the ignition OFF.
If the specified value was obtained:
-- Replace the HO2S Oxygen Sensor Bank 1 Sensor 1 -G39-.
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 Information.
-- Using a multimeter, check the HO2S Oxygen Sensor Bank 1 Sensor 1 -G39- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T94 terminals for an open circuit.
| HO2S Oxygen Sensor Bank 1 Sensor 1 -G39- electrical harness connector terminals | Engine Control Module (ECM) -J623- electrical connector T94 terminals or test box sockets |
|---|---|
| 1 | 60 |
| 2 | 61 |
| 3 | 51 |
| 5 | 81 |
| 6 | 82 |
Specified value: 1.5 Ω Max.
If the specification was Not obtained:
-- Check the wiring for high resistance, an open or a short to voltage or ground.
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and the voltage supply was Not OK:
-- Replace the Engine Control Module (ECM) -J623-. Refer to the Repair Information.
-- Assembly is performed in the reverse of the removal.
Final procedures
After repair work, the following work steps must be performed in the mentioned 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 .