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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-529 . Check Conditions • Engine coolant temperature is higher than 65° C (149° F). • Drive for 4 seconds or more with the vehicle speed is 50 km/h (31 mph) or more. Stop the Judgement Criterion • Power steering pressure switch continues to be "ON". . FAIL-SAFE AND BACKUP FUNCTION • None . OBD-II DRIVE CYCLE PATTERN None. . TROUBLESHOOTING HINTS (The most • Power steering pressure switch failed. circuit, harness damage, or connector damage. • ECM failed. DIAGNOSIS Required Special Tools: • MB991958: Scan tool (M.U.T.-III Sub Assembly) • MB991824: V.C.I. • MB992110: Power Plant ECU Check Harness STEP 1. Using scan tool MB991958, check data list item 83: CAUTION To prevent damage to scan tool MB991958, always turn the 83, Power Steering Pressure Switch. • If the steering wheel is not turned while idling, "OFF" will be displayed. • If the steering wheel is turned while idling, "ON" will be displayed. (4) Turn the ignition switch to the "LOCK" (OFF) position. YES : It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Cope with Intermittent Malfunctions . NO : Go to Step 2. AC608435 Data link connector MB991827 MB991824 MB991910 AB |