STEP 1. Using scan tool (M.U.T.-IIISE), check actuator test item 1: Injectors.
STEP 2. Check No. 4 cylinder injector itself.
STEP 3. Check of short to power supply in INJ4 line between No. 4 cylinder injector connector and ECM connector.
STEP 4. Using the oscilloscope, check the No. 4 cylinder injector.
STEP 5. 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 1 . (2) Check the diagnostic trouble code (DTC).
Is DTC P0271 set?
Retry the troubleshooting. The inspection is complete.