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Home >> Mitsubishi >> 2002 >> Montero XLS >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Diagnosis - R4A51, V4A51 & V5A51 >> Symptom Tests >> Test D: Vehicle Does Not Move Forward Or Reverse >> Diagnostic Procedure

Diagnostic Procedure

  1. Check the hydraulic pressure. See HYDRAULIC PRESSURE TESTS  under PERFORMANCE TESTS. Measure the hydraulic pressure of each element when the transmission is in 1st, 2nd or reverse. Check if each hydraulic pressure is within the standard value. If some elements are within the standard value and some are not, recheck the symptom. Are all hydraulic pressures within the standard value? If so, check transmission fluid level and condition. See appropriate SERVICING article. If not, repair or replace as necessary, then recheck symptom. If okay, go to step  3 . If not, go to next step.
  2. Disassemble and clean the valve body. See appropriate OVERHAUL article. Check the "O" ring installation, bolts for looseness and 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 the symptom is not eliminated, go to step  4 .
  3. Check the transmission powertrain components. Disassemble the transmission and check the planetary carrier and output shaft, etc. Repair or replace the damaged parts. Check the symptom. Is the symptom eliminated? If so, diagnosis is complete. If not, go to step  5 .
  4. Remove the transmission. Replace the oil pump (oil pump cannot be repaired). Check the symptom. Is the symptom eliminated? If so, diagnosis is complete. If not, go to next step.
  5. 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 .
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