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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-593 Check Conditions • Engine coolant temperature is higher than 20°C (68 °F). • Vehicle speed is higher than 50 km/h (31 mph). Judgement Criterion • The ON/OFF frequency of a power steering pres- sure switch is 10 Hz or more for 20 seconds. . OBD-II DRIVE CYCLE PATTERN Refer to Diagnostic Function − OBD-II Drive Cycle − Pattern 17 . TROUBLESHOOTING HINTS (The most • Power steering pressure switch failed. • Incorrect power steering fluid level. • Incorrect oil pump pressure. • Harness damage. • Connector damage. • ECM failed. DIAGNOSIS Required Special Tools: • MB991958: Scan tool (M.U.T.-III Sub Assembly) • MB991824: V.C.I. • MB991827: USB Cable • MB991910: Main Harness A 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 − How to Cope with Intermittent Malfunctions . NO : Go to Step 2. STEP 2. Check the power steering fluid level. − Fluid Level Check . Q: Are there any abnormalities? YES : Repair it. Then go to Step 7. AK700568AB MB991824 MB991827 MB991910 Data link |