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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-689 STEP 5. Using scan tool MB991958, read the diagnostic again. (3) Turn the ignition switch to the "LOCK" (OFF) position. YES : Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, ID Code or GROUP 42C, ID Codes Registration Judgment Table <Vehicles with WCM> . Then go to Step 6. NO : It can be assumed that this malfunction is intermittent of CAN bus line between ECM and TC-SST-ECU. Cope with Intermittent Malfunctions . STEP 6. Using scan tool MB991958, read the diagnostic again. (3) Turn the ignition switch to the "LOCK" (OFF) position. YES : Retry the troubleshooting. DTC U0121: ASC-ECU Time-out CAUTION • If the ECM output the DTC U0121, make sure to diagnose the CAN bus line. • Before replacing the ECU, make sure that the communication circuit is operating normally. . DESCRIPTIONS OF MONITOR METHODS There is no data from ASC-ECU for the specified time. (ASC-ECU also detect communication error . MONITOR EXECUTION Continuous . MONITOR EXECUTION CONDITIONS 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 . |