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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-235 STEP 2. Using scan tool MB991502, check data list item 81: 81, Long − Term Fuel Compensation (trim) Bank 1. • The fuel trim should be between -12.5 and +12.5 when (3) Turn the ignition switch to "LOCK" (OFF) position. Q: Is the specification normal? YES : Go to Step 3. − System too Lean (bank 1) ), DTC P0172 − System too Rich (bank 1) ), DTC P0174 − System too Lean (bank 2) ), DTC P0175 − System too Rich (bank 2) ). STEP 3. Using scan tool MB991502, check data list item 82: 82, Short − Term Fuel Compensation (trim) Bank 1. • The fuel trim should be between -25 and +25 when the (3) Turn the ignition switch to "LOCK" (OFF) position. Q: Is the specification normal? YES : Go to Step 4. − System too Lean (bank 1) ), DTC P0172 − System too Rich (bank 1) ), DTC P0174 − System too Lean (bank 2) ), DTC P0175 − System too Rich (bank 2) ). STEP 4. Check the ignition coil spark cable. (4) Ground the spark plug side electrode securely. • When the engine is cranked, the spark plug should Q: Did it spark? YES : Go to Step 7. AKX01177 16 PIN MB991502 AB AKX01177 16 PIN MB991502 AB AKX00432 SPARK PLUG AB |