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TROUBLESHOOTING MULTIPORT FUEL INJECTION (MPI) <4A9> 13A-230 NOTE: In case of Past malfunction, M.U.T.-III CAN bus diagnosis cannot detect the failure even if − How to Use Trou- bleshooting/Inspection Service Points − How to Cope with Intermittent Malfunctions The diagnosis codes being output to each ECU −
Diagnosis − CAN Bus Diagnosis Table PROBABLE CAUSES • Failed harness and connector in CAN busline • Failed A/C-ECU • Failed engine-ECU <M/T> or engine-CVT-ECU <CVT> DIAGNOSIS STEP 1. M.U.T.-III CAN bus diagnosis • Using M.U.T.-III, perform CAN busline diagnosis. Q: Is the check result normal? YES : Go to Step 2 . NO : Correct CAN busline (Refer to GROUP 54D ), and then go to Step 6 . STEP 2. M.U.T.-III other system diagnosis code • Confirm whether the diagnosis code is output from A/C-ECU. Q: Is the diagnosis code set? YES : Perform the troubleshooting of A/C-ECU (Refer to GROUP 55 − Troubleshooting − Diagnostic Table Code Chart ). NO : Go to Step 3 . STEP 3. M.U.T.-III other system diagnosis codes • ETACS-ECU Q: Is the diagnosis code set? YES : Go to Step 4 . NO : Go to Step 5 . STEP 4. M.U.T.-III diagnosis code • Reconfirm whether the diagnosis code is output from engine-ECU <M/T> or engine-CVT-ECU 1. Erase the diagnosis code being output. Q: Is the diagnosis code set? YES : Replace A/C-ECU, then go to Step 6 . NO : Intermittent malfunction in CAN busline − How to Use Troubleshooting/Inspection Service Points − How to Cope with Intermittent Malfunctions ). STEP 5. M.U.T.-III diagnosis code • Reconfirm whether the diagnosis code is output from engine-ECU <M/T> or engine-CVT-ECU 1. Erase the diagnosis code being output. Q: Is the diagnosis code set? YES : Replace engine-ECU <M/T> or engine-CVT-ECU <CVT>, go to Step 6 . NO : Intermittent malfunction in CAN busline − How to Use Troubleshooting/Inspection Service Points − How to Cope with Intermittent Malfunctions ). STEP 6. M.U.T.-III diagnosis code • Reconfirm whether the diagnosis code is output from engine-ECU <M/T> or engine-CVT-ECU 1. Erase the diagnosis code being output. Q: Is the diagnosis code set? YES : Go to Step 1 . NO : Check end. Main Index Group TOC |