P2195
DTC P2195: Heated Oxygen Sensor Inactive (bank 1, sensor 1)
CAUTION:
If DTC P2195 has been set, TCL related DTC U1120 is also set. After P2195 has been diagnosed, don't forget to erase DTC U1120.
TECHNICAL DESCRIPTION
- The ECM [M/T] or the PCM [A/T] effects air/fuel ratio feedback control in accordance with the signals from the right bank heater oxygen sensor (front).
- If the right bank heated oxygen sensor (front) has deteriorated, corrections will be made by the right bank heated oxygen sensor (rear).
- DTC P2195 becomes stored in memory if a failure is detected in the right bank heated oxygen sensor (front).
DESCRIPTIONS OF MONITOR METHODS
Right bank heated oxygen sensor (front) output voltage does not cross lean/rich criteria (about 0.5 volt) within specified period.
MONITOR EXECUTION
Continuous
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
- Heated oxygen sensor (front) monitor
- Misfire monitor
Sensor (The sensor below is determined to be normal)
- Engine coolant temperature sensor
- Intake air temperature sensor
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
- 128 seconds or more have passed since the engine starting sequence was completed.
- Engine coolant temperature is 7°C (45°F) or more.
- Under the closed loop air/fuel ratio control.
- Intake air temperature is more than -10°C (14°F)
Judgment Criterion
- Right bank heated oxygen sensor (front) output voltage is less than lean/rich criteria (about 0.5 volt) for 128 seconds.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 22 OBD-II Drive Cycle .
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )
- Right bank heated oxygen sensor (front) deteriorated.
- ECM failed. [M/T]
- PCM failed. [A/T]
DIAGNOSIS
Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A
- MD998464: Test Harness
STEP 1. Check the right bank heated oxygen sensor (front).
(1)Disconnect the right bank heated oxygen sensor (front) connector B-08 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 temperature reaches 80°C (176°F) or higher.
(3)Rev the engine for 5 minutes or more with the engine speed of 2,500 r/min.
(4)Connect a digital voltage meter between terminal No. 2 (black clip) and terminal No. 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
(6)
CAUTION:
- Be very careful when connecting the jumper wires; incorrect connection can damage the heated oxygen sensor.
- Be careful the heater can be damaged if a voltage beyond 8 volts is applied to the heated oxygen sensor heater.
NOTE:
If the temperature of sensing area does not reach the high temperature [of approximately 400°C (752°F) or more] even through the heated oxygen sensor is normal, the output voltage would be possibly low in spite of the rich air-fuel ratio. Therefore, if the output voltage is low, use a jumper wire to connect the terminal No. 1 (red clip) and the terminal No. 3 (blue clip) of the heated oxygen sensor with the positive terminal and the negative terminal of 8 volts power supply respectively, then check again.
Q. Is the voltage between 0.6 and 1.0 volt?
YES Go to Step 2.
NO Replace the right bank heated oxygen sensor (front). Then go to Step 3.
STEP 2. Test the OBD-II drive cycle.
(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 22 OBD-II Drive Cycle.
(2)Check the diagnostic trouble code (DTC).
Q. Is DTC P2195 set?
YES Replace the ECM or the PCM. When the ECM or the PCM is replaced, register the encrypted code. Immobilizer System.
Then go to Step 3.
NO It can be assumed that this malfunction is intermittent. How to Cope With Intermittent Malfunctions.
STEP 3. Test the OBD-II drive cycle.
(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 22 OBD-II Drive Cycle.
(2)Check the diagnostic trouble code (DTC).
Q. Is DTC P2195 set?
YES Retry the troubleshooting.
NO The inspection is complete.