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DTC P0058: Heated Oxygen Sensor Heater Circuit High (bank 2, sensor 2)
 
 
 
 
CIRCUIT OPERATION
  • Power is supplied from the MFI relay to the left bank heated oxygen sensor (rear) heater.
  • The ECM terminal OHRL controls continuity to the left bank heated oxygen sensor (rear) heater by turning the power transistor in the ECM "ON" and "OFF".
 
 
TECHNICAL DESCRIPTION
  • The ECM checks whether the heater current is within a specified range when the heater is energized.
 
 
DESCRIPTIONS OF MONITOR METHODS
  • Heated oxygen sensor heater (rear) current is out of specified range.
 
 
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)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS
Logic Flow Chart
 
 
Check Conditions
  • More than 2 seconds have passed since the engine starting sequence was completed.
  • While the left bank heated oxygen sensor (rear) heater is on.
  • Battery positive voltage is between 11 and 16.5 volts.
Judgment Criterion
  • The left bank heated oxygen sensor (rear) heater current has continued to be higher than 10.5 amperes for 2 seconds.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • None
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 2 .
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be stored are: )
  • Left bank heated oxygen sensor (rear) failed.
  • ECM failed.

 
 
DIAGNOSIS
Required Special Tool:
  • MB991316: Test Harness
STEP 1. Check the left bank heated oxygen sensor (rear).
(1) Disconnect left bank heated oxygen sensor (rear) connector and connect test harness special tool, MB991316, to the connector on the left bank heated oxygen sensor (rear) side.
(2) Measure the resistance between heated oxygen sensor connector terminal power supply line and terminal OHRL line.
(3)
Standard value: 11 - 18 Ω [at 20°C (68°F)]
Is the measured resistance between 4.5 and 8.0 ohms [at 20°C (68°F)]?
Go to Step 2.
Replace the left bank heated oxygen sensor (rear). Then go to Step 3.
 
STEP 2. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 2 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P0058 stored?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 3.
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - 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 2 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P0058 stored?
Retry the troubleshooting.
The inspection is complete.