|
|
TSB Revision DIAGNOSTIC TROUBLE CODE PROCEDURES 13Ac-345 DIAGNOSIS Required Special Tool: • MB991502: Scan Tool (MUT-II) STEP 1. Using scan tool MB991502, check data list item 22: CAUTION To prevent damage to scan tool MB991502, always turn the 22, Crankshaft Position Sensor. (4) Check the waveform of the crankshaft position sensor while keeping the engine speed constant. • The pulse width should be constant. Q: Is the sensor operating properly? YES : Go to Step 2. − Crankshaft Position Sensor Circuit Malfunction. STEP 2. Using scan tool MB991502, check data list item 81 81<bank 1> and 83 <bank2>, Long-Term Fuel Trim. • The fuel trim should be between −12.5 and +12.5 when the load is 2,500 r/min (during closed loop) after the 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) . ACX01539 16-PIN MB991502 AC ACX01539 16-PIN MB991502 AC |