MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-238
STEP 1. Using scan tool MB991502, check data list item 59:
Heated Oxygen Sensor Bank 2, Sensor 2 (left rear).
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(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
59, Heated Oxygen Sensor Bank 2, Sensor 2 (left rear).
(4) Warm up the engine.
•
After increasing the output voltage 0.15 volt or more by
the engine revving, finish it. Then confirm that the output
voltage reduces to 0.15 volt or less within 3 seconds.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES :
It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points
NO :
Replace the left bank heated oxygen sensor (rear).
Then go to Step 2.
STEP 2. 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
(2) Check the diagnostic trouble code (DTC).
Q: Is the DTC P0159 is output?
YES :
Retry the troubleshooting.
NO :
The inspection is complete.
AKX01177
16 PIN
MB991502
AB
