LEMON Manuals: Even more car manuals for everyone
Home >> Mitsubishi >> 2002 >> Montero XLS >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Diagnosis - R4A51, V4A51 & V5A51 >> Symptom Tests >> Test K: Incorrect Shift Points (Some Gears) >> Diagnostic Procedure

Diagnostic Procedure

  1. Using scan tool, check INVECS-II CANCEL command. Drive the vehicle and confirm the gear shifting corresponds to the standard shift line of the shift pattern diagram. See SHIFT SPEED SPECIFICATIONS  under PERFORMANCE TESTS. Turn ignition off. Does the gear shifting correspond to the standard shift line of the shift pattern diagram? If so, symptom is due to characteristics of the INVECS-II system, but is not abnormal. If not, go to next step.
  2. Check the shift points. See SHIFT SPEED SPECIFICATIONS  under PERFORMANCE TESTS. Are the shift points early or late only when transmission fluid is 84°F (29°C) or less (early), or 257°F (125°C) or more (late)? If so, symptom is due to characteristics of the INVECS-II system, but is not abnormal. If not, go to next step.
  3. Disassemble and clean the valve body. Check the "O" ring installation, bolts for looseness and the valve body for damage. Repair or replace the faulty parts. Is the repair possible and the symptom eliminated? If so, diagnosis is complete. If not, replace the valve body assembly. Check the symptom. If symptom still exists, go to next step.
  4. Possible faulty PCM exists. Replace the PCM if necessary. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. Is the symptom eliminated? If so, diagnosis is complete. If not, go to step  1 .
scientia non olet · About LEMON Manuals