Oxygen Sensor: Testing and Inspection
Component InspectionHEATED OXYGEN SENSOR 1
With CONSULT-II
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Select "MANU TRIG" in "DATA MONITOR" mode, and the trigger point is adjusted to 100%.
4. Select "HO2S1 (B1)" and "HO2S1 MNTR (B1)" in item selection.
5. Hold engine speed at 2,000 rpm under no load during the following steps.
6. Touch "START" on CONSULT-II screen.
7. Check the following.
- "HO2S1 MNTR (B1)" in "DATA MONITOR" mode changes from "RICH" to "LEAN" to "RICH" 5 times in 10 seconds.
5 times (cycles) are counted as shown below:
- "HO2S1 (B1)" voltage goes above 0.6 V at least once.
- "HO2S1 (B1)" voltage goes below 0.3 V at least once.
- "HO2S1 (B1)" voltage never exceeds 1.0 V.
CAUTION:
- Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
- Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
Without CONSULT-II
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Set voltmeter probes between ECM terminal 50 [Heated oxygen sensor 1 signal] and engine ground.
4. Check the following with engine speed held at 2,000 rpm constant under no load.
- The voltage fluctuates between 0 to 0.3V and 0.6 to 1.0V more than 5 times within 10 seconds.
1 time: 0 - 0.3 V -> 0.6 - 1.0 V -> 0 - 0.3 V
2 times: 0 - 0.3 V -> 0.6 - 1.0 V -> 0 - 0.3 V -> 0.6 - 1.0 V -> 0 - 0.3 V
- The maximum voltage is over 0.6 V at least 1 time.
- The minimum voltage is below 0.3 V at least 1 time.
- The voltage never exceeds 1.0 V.
CAUTION:
- Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
- Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
Component Inspection
HATED OXYGEN SENSOR 2
With CONSULT-II
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to the normal operating temperature.
3. Turn ignition switch OFF and wait at least 5 seconds.
4. Start engine and keep engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
5. Let engine idle for 1 minute.
6. Select "FUEL INJECTION" in "ACTIVE TEST" mode, and select "HO2S2 (B1)" as the monitor item with CONSULT-II.
7. Check "HO2S2 (B1)" at idle speed when adjusting "FUEL INJECTION" to ± 25%.
"HO2S2 (B1)" should be above 0.68 V at least once when the "FUEL INJECTION" is ± 25%. "HO2S2 (B1)" should be below 0.55 V at least once when the "FUEL INJECTION" is -25%.
CAUTION:
- Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
- Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
Without CONSULT-II
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to the normal operating temperature.
3. Turn ignition switch OFF and wait at least 5 seconds.
4. Start engine and keep engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
5. Let engine idle for 1 minute.
6. Set voltmeter probes between ECM terminals 56 (Heated oxygen sensor 2 signal) and engine ground.
7. Check the voltage when revving up to 4,000 rpm under no load at least 10 times.
(Depress and release accelerator pedal as soon as possible.)
The voltage should be above 0.68 V at least once.
If the voltage is above 0.68 V at step 4, step 5 is not necessary.
8. Check the voltage when revving up to 5,000 rpm under no load. Or keep vehicle at idling for 10 minutes, then check the voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in 3rd gear position (M/T), D position with "OD" OFF (A/T).
The voltage should be below 0.55 V at least once.
CAUTION:
- Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
- Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.