California

Right Bank Heated Oxygen Sensor (front) Circuit:

CIRCUIT OPERATION
- A voltage corresponding to the oxygen concentration in the exhaust gas is sent to the ECM (terminal 72) or PCM (terminal 72) from the output terminal (terminal 4) of the right bank heated oxygen sensor (front).
- Terminal 2 of the right bank heated oxygen sensor (front) is grounded with ECM (terminal 49) or PCM (terminal 57) .

TECHNICAL DESCRIPTION
- The right bank heated oxygen sensor (front) detects the concentration of oxygen in the exhaust gas; it converts those data to voltage, and inputs the resulting signals to the ECM or PCM .
- When the right bank heated oxygen sensor (front) begins to deteriorate, the heated oxygen sensor signal response becomes poor.
- The ECM or PCM forcibly varies the air/fuel mixture to make it leaner and richer, and checks the response speed of the right bank heated oxygen sensor (front). In addition, the ECM or PCM also checks for an open circuit in the right bank heated oxygen sensor (front) output line.

DTC SET CONDITIONS

Check Conditions
- Right bank heated oxygen sensor (front) signal voltage has continued to be 0.2 volt or lower for three minutes or more after the starting sequence was completed.
- Engine coolant temperature is higher than 82°C (180°F).
- Engine speed is higher than 1,200 r/min.
- Volumetric efficiency is higher than 25 percent.
- Monitoring time: 7 seconds.

Judgment Criteria
- Input voltage supplied to the ECM or PCM interface circuit is higher than 4.5 volts when 5 volts is applied to the right bank heated oxygen sensor (front) output line via a resistor.
- Only one monitor during one drive cycle

Check Conditions
- Engine coolant temperature is higher than 50°C (176°F).
- Engine speed is at between 1,250 and 3,000 r/min.
- Volumetric efficiency is at between 20 and 60 percent.
- Intake air temperature is higher than -10°C (14°F).
- Barometric pressure is higher than 76 kPa (11 psi).
- Under the closed loop air/fuel control.
- Vehicle speed is 30 km/h (18.7 mph) or more.
- Throttle valve opening angle (TPS output voltage) fluctuates within 0.117 volts every 250 milliseconds.
- Monitoring time: 5 - 20 seconds.

Judgment Criteria
- When the air/fuel ratio is forcibly changed (lean to rich), the right bank heated oxygen sensor (front) signal does not provide response within 0.95 seconds.

or

- The heated oxygen sensor (front) sends lean" and rich" signals alternately eleven times or less for 12 seconds.
- Three monitors during one drive cycle

NOTE: If the sensor switch time is longer than the Judgment Criteria due to the MUT-II OBD-II test Mode - HO2S Test Results, it is assumed that the heated oxygen sensor has deteriorated. If it is short, it is assumed that the harness is damaged or has a short circuit
If the heated oxygen sensor signal voltage has not changed even once (lean/rich) after the DTC was erased, the sensor switch time will display as 0 seconds.

TROUBLESHOOTING HINTS
The most likely causes for this code to be set are:
- Right bank heated oxygen sensor (front) deteriorated.
- Open circuit in right bank heated oxygen sensor (front) output line.
- Open circuit in right black heated oxygen sensor (front) ground line.
- ECM failed.
- PCM failed.

DIAGNOSIS
Required Special Tool:
MB991502: Scan Too! (MUT-II)
MB998464: Test Harness

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

STEP 1. Using scan tool MB991502, check data list item 11: Heated Oxygen Sensor (front).
1. Connect scan tool MB991502 to the data link connector.
2. Start the engine and run at idle.
3. Set scan tool MB991502 to the data reading mode for item 11, Heated Oxygen Sensor (front).
- Warm up the engine. When the engine is decelerated suddenly from 4000 r/min, the output voltage should increase from 200 mV or less to 600 - 1000 mV in a few seconds.
- Warm up the engine. When the engine speed is 2000 r/min, more than 0.5 volt and less than 0.5 volt should alternate five times of more within 10 seconds.

If the checks above meet the specification, this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope With Intermittent Malfunction.

If the checks above do not meet the specification, go to Step 2.

STEP 2. Check the right bank heated oxygen sensor (front).
1. Disconnect the right bank heated oxygen sensor connector (front) B-27 and connect test harness special tool, MD998464, to the connector on the right bank heated oxygen sensor (front) side.
2. Warm up the engine until engine coolant is 80°C (176°F) or higher.

CAUTION: Be very careful when connecting the jumper wires. Incorrect connection can damage the right bank heated oxygen sensor (front).

3. Use the jumper wires to connect terminal 1 (red clip) of the right bank heated oxygen sensor (front) connector to the positive battery terminal and terminal 3 (blue clip) to the negative battery terminal.
4. Connect a digital voltmeter between terminal 2 (black clip) and terminal 4 (white clip).
5. While repeatedly revving the engine, measure the right bank heated oxygen sensor (front) output voltage.

Standard value: 0.6 - 1.0 V

If within specifications, go to Step 3.

If not within specifications, replace the right bank heated oxygen sensor (front). Then go to Step 7.

STEP 3. Check harness connector B-27 at the right bank heated oxygen sensor (front) for damage.
If harness connector B-27 is in good condition, go to Step 4.

If the harness connector B-27 is damaged, repair or replace
it. Refer to Harness Connector Inspection. Then go to Step 7.

STEP 4. Check harness connector C-58, C-62 at the ECM or harness connector C-55, C-59 for damage.
If harness connectors C-58, C-62 or C-55, C-59 are in good condition, go to Step 5.

If harness connectors C-58, C-62 or C-55, C-59 are damaged, repair or replace it.
Refer to Harness Connector Inspection. Then go to Step 7.

STEP 5. Check the harness wire between the right bank heated oxygen sensor (front) connector B-27 and the ECM connector C-58, C-62 or PCM connector C-555 C-59 .
If the wires between the right bank heated oxygen sensor (front) connector B-27 and the ECM connector C-58, C-62 or PCM connector C-55, C-59 are not damaged, go to Step 6.

If the wires between the right bank heated oxygen sensor (front) connector B-27 and ECM connector C-58, C-62 or PCM connector C-55, C-59 are damaged, repair it. Then go to Step 7.

STEP 6. Replace the right bank heated oxygen sensor (front).
1. Replace the right bank heated oxygen sensor (front).
2. Carry out a test drive with the drive cycle pattern. Refer to Procedure 4 - Heated Oxygen Sensor Monitor and Procedure 6 - Other Monitor.
3. Check for the diagnostic trouble code (DTC).

If DTC P0130 is not output, the inspection is complete.

If DTC P0130 is output, replace the ECM or PCM. Then go to Step 7.

STEP 7. Test the OBD-II drive cycle.
1. Carry out a test drive with the drive cycle pattern. Refer to Procedure 4 - Heated Oxygen Sensor Monitor and Procedure 6 - Other Monitor.
2. Read the diagnostic trouble code, and confirm that diagnostic trouble code P0130 does not reset.