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Home >> Mitsubishi >> 2001 >> Montero XLS >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Diagnosis - R4A51, V4A51 & V5A51 >> Diagnostic Tests >> DTC 27 (P0705): Park/Neutral Position Switch Circuit - Open >> Diagnostic Procedure (Montero)

Diagnostic Procedure (Montero)

CAUTION: To prevent damage to scan tool, always turn the ignition off before connecting or disconnecting scan tool.
  1. Using scan tool, monitor PNP switch. Turn ignition on. Move the gearshift lever to "P", "R", "N", "D", "3", "2", "L" and sport mode positions to confirm gearshift lever position matches scan tool display (sport mode is indicated as "D" on the scan tool). Turn ignition off. Is the PNP switch operating properly? If so, malfunction is intermittent. If not, select from the following:
    • When scan tool display disagrees at all positions, go to next step.
    • When scan tool display disagrees at "P" position, go to step  6 .
    • When scan tool display disagrees at "R" position, go to step  14 .
    • When scan tool display disagrees at "N" position go to step  21 .
    • When scan tool display disagrees at "D" position, go to step  28 .
    • When scan tool display disagrees at "3" position, go to step  36 .
    • When scan tool display disagrees at "2" position, go to step  42 .
    • When scan tool display disagrees at "L" position, go to step  48 .
    • When scan tool display disagrees at sport mode position (agrees at "D" position), go to step  54 .
  2. Check the PNP switch. See PARK/NEUTRAL POSITION SWITCH  under COMPONENT TESTS. Is the PNP switch operating properly? If so, go to next step. If not, replace PNP switch. See appropriate SERVICING article.
  3. Check all PNP switch circuit harness connectors for damage. Are the harness connectors in good condition? If so, go to next step. If not, repair or replace the defective harness connector(s).
  4. Check wire harness for open or short to ground between PNP switch harness connector terminal No. 7 and junction block harness connector D-212 terminal No. 9. Is the wire harness in good condition? If so, go to next step. If not, repair wire harness as necessary.
  5. Using scan tool, monitor PNP switch. Turn ignition on. Move the gearshift lever to "P", "R", "N", "D", "3", "2", "L" and sport mode positions to confirm gearshift lever position matches scan tool display (sport mode is indicated as "D" on the scan tool). Turn ignition off. Is the PNP switch operating properly? If so, malfunction may be intermittent. If not, possible faulty PCM exists. Replace the PCM if necessary. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION.
  6. Check the PNP switch. See PARK/NEUTRAL POSITION SWITCH  under COMPONENT TESTS. Is the PNP switch operating properly? If so, go to next step. If not, replace PNP switch. See appropriate SERVICING article.
  7. Check PNP switch harness connector for damage. Is the harness connector in good condition? If so, go to next step. If not, repair or replace defective harness connector.
  8. Check the PNP switch output voltage at PCM harness connector by backprobing. Do not disconnect harness connector. Turn ignition on. Move the gearshift lever to "P" position. Measure the voltage between PCM harness connector terminal No. 101 and ground. Battery voltage should exist. Turn ignition off. Is the voltage as specified? If so, go to step  13 . If not, go to next step.
  9. Check all PNP switch circuit harness connectors for damage. Are the harness connectors in good condition? If so, go to next step. If not, repair or replace the defective harness connector(s).
  10. Check wire harness for open or short to ground between PNP switch harness connector terminal No. 1 and PCM harness connector terminal No. 101. Is the wire harness in good condition? If so, go to next step. If not, repair wire harness as necessary.
  11. Check combination meter harness connector and related circuit harness connectors for damage. Are the harness connectors in good condition? If so, go to next step. If not, repair or replace the defective harness connector(s).
  12. Check wire harness for short to ground between PNP switch harness connector terminal No. 1 and combination meter harness connector D-05 terminal No. 1. Is the wire harness in good condition? If so, repair short to ground in wire harness between the PNP switch harness connector terminal No. 2 and the transfer-ECU harness connector E-104 terminal No. 32. See appropriate DIAGNOSIS article in TRANSFER CASES. If not, repair wire harness as necessary.
  13. Check PCM harness connectors for damage. Are the harness connectors in good condition? If so, go to step  5 . If not, repair or replace the defective harness connector(s).
  14. Check the PNP switch. See PARK/NEUTRAL POSITION SWITCH  under COMPONENT TESTS. Is the PNP switch operating properly? If so, go to next step. If not, replace PNP switch. See appropriate SERVICING article.
  15. Check PNP switch harness connector for damage. Is the harness connector in good condition? If so, go to next step. If not, repair or replace the defective harness connector(s).
  16. Check the PNP switch output voltage at PCM harness connector by backprobing. Do not disconnect harness connector. Turn ignition on. Move the gearshift lever to "R" position. Measure the voltage between PCM harness connector terminal No. 108 and ground. Battery voltage should exist. Turn ignition off. Is the voltage as specified? If so, go to step  13 . If not, go to next step.
  17. Check all PNP switch circuit harness connectors for damage. Are the harness connectors in good condition? If so, go to next step. If not, repair or replace the defective harness connector(s).
  18. Check wire harness for open or short to ground between PNP switch harness connector terminal No. 8 and PCM harness connector terminal No. 108. Is the wire harness in good condition? If so, go to next step. If not, repair wire harness as necessary.
  19. Check combination meter harness connector and related circuit harness connectors for damage. Are the harness connectors in good condition? If so, go to next step. If not, repair or replace the defective harness connector(s).
  20. Check wire harness for short to ground between PNP switch harness connector terminal No. 8 and combination meter harness connector D-05 terminal No. 2. Is the wire harness in good condition? If so, repair short to ground in wire harness between output signal line of PNP switch harness connector terminal No. 8 and PCM harness connector terminal No. 108. If not, repair wire harness as necessary.
  21. Check the PNP switch. See PARK/NEUTRAL POSITION SWITCH  under COMPONENT TESTS. Is the PNP switch operating properly? If so, go to next step. If not, replace PNP switch. See appropriate SERVICING article.
  22. Check PNP switch harness connector for damage. Is the harness connector in good condition? If so, go to next step. If not, repair or replace defective harness connector.
  23. Check the PNP switch output voltage at PCM harness connector by backprobing. Do not disconnect harness connector. Turn ignition on. Move the gearshift lever to "N" position. Measure the voltage between PCM harness connector terminal No. 121 and ground by backprobing. Battery voltage should exist. Turn ignition off. Is the voltage as specified? If so, go to step  13 . If not, go to next step.
  24. Check all PNP switch circuit harness connectors for damage. Are the harness connectors in good condition? If so, go to next step. If not, repair or replace the defective harness connector(s).
  25. Check wire harness for open or short to ground between PNP switch harness connector terminal No. 2 and PCM harness connector terminal No. 121. Is the wire harness in good condition? If so, go to next step. If not, repair wire harness as necessary.
  26. Check combination meter harness connector and related circuit harness connectors for damage. Are the harness connectors in good condition? If so, go to next step. If not, repair or replace the defective harness connector(s).
  27. Check wire harness for short to ground between PNP switch harness connector terminal No. 2 and combination meter harness connector D-05 terminal No. 3. Is the wire harness in good condition? If so, repair short to ground in wire harness between the PNP switch harness connector terminal No. 3 and the transfer-ECU harness connector E-104 terminal No. 32. See appropriate DIAGNOSIS article in TRANSFER CASES.
  28. Check the PNP switch. See PARK/NEUTRAL POSITION SWITCH  under COMPONENT TESTS. Is the PNP switch operating properly? If so, go to next step. If not, replace PNP switch. See appropriate SERVICING article.
  29. Check PNP switch harness connector for damage. Is the harness connector in good condition? If so, go to next step. If not, repair or replace the defective connector.
  30. Check the PNP switch output voltage at PCM harness connector by backprobing. Do not disconnect harness connector. Turn ignition on. Move the gearshift lever to "D" position. Measure the voltage between PCM harness connector terminal No. 102 and ground. Battery voltage should exist. Turn ignition off. Is the voltage as specified? If so, go to step  13 . If not, go to next step.
  31. Check all PNP switch circuit harness connectors for damage. Are the harness connectors in good condition? If so, go to next step. If not, repair or replace defective harness connector(s).
  32. Check wire harness for open or short to ground between PNP switch harness connector terminal No. 3 and PCM harness connector terminal No. 102. Is the wire harness in good condition? If so, go to next step. If not, repair wire harness as necessary.
  33. Check combination meter harness connector and related circuit harness connectors for damage. Are the harness connectors in good condition? If so, go to next step. If not, repair or replace the defective harness connector(s).
  34. Check wire harness for short to ground between PNP switch harness connector terminal No. 3 and shift switch assembly harness connector terminal No. 1. Is the wire harness in good condition? If so, repair short to ground in wire harness between shift switch assembly harness connector terminal No. 5 and combination meter harness connector D-05 terminal No. 4. If not, repair wire harness as necessary.
  35. Check combination meter harness connector and related circuit harness connectors for damage. Are the harness connectors in good condition? If so, repair short to ground in wire harness between PNP switch harness connector terminal No. 3 and combination meter harness connector D-05 terminal No. 4. If not, repair or replace the defective harness connector(s).
  36. Check the PNP switch. See PARK/NEUTRAL POSITION SWITCH  under COMPONENT TESTS. Is the PNP switch operating properly? If so, go to next step. If not, replace PNP switch. See appropriate SERVICING article.
  37. Check PNP switch harness connector for damage. Is the harness connector in good condition? If so, go to next step. If not, repair or replace defective harness connector.
  38. Check the PNP switch output voltage at PCM harness connector by backprobing. Do not disconnect harness connector. Turn ignition on. Move the gearshift lever to "3" position. Measure the voltage between PCM harness connector terminal No. 109 and ground. Battery voltage should exist. Turn ignition off. Is the voltage as specified? If so, go to step  13 . If not, go to next step.
  39. Check all PNP switch circuit harness connectors. Are the harness connectors in good condition? If so, go to next step. If not, repair or replace the defective harness connector(s).
  40. Check wire harness for open or short to ground between PNP switch harness connector terminal No, 4 and PCM harness connector terminal No. 109. Is the wire harness in good condition? If so, go to next step. If not, repair wire harness as necessary.
  41. Check combination meter harness connector and related circuit harness connectors for damage. Are the harness connectors in good condition? If so, repair short to ground in wire harness between PNP switch harness connector terminal No. 4 and combination meter connector D-05 terminal No. 7. If not, repair or replace the defective harness connector(s).
  42. Check the PNP switch. See PARK/NEUTRAL POSITION SWITCH  under COMPONENT TESTS. Is the PNP switch operating properly? If so, go to next step. If not, replace PNP switch. See appropriate SERVICING article.
  43. Check PNP switch harness connector for damage. Is the harness connector in good condition? If so, go to next step. If not, repair or replace defective harness connector.
  44. Check the PNP switch output voltage at PCM harness connector by backprobing. Do not disconnect harness connector. Turn ignition on. Move the gearshift lever to "2" position. Measure the voltage between PCM harness connector terminal No. 122 and ground. Battery voltage should exist. Turn ignition off. Is the voltage as specified? If so, go to step  13 . If not, go to next step.
  45. Check all PNP switch circuit harness connectors for damage. Are the harness connectors in good condition? If so, go to next step. If not, repair or replace the defective harness connector(s).
  46. Check wire harness for open or short to ground between PNP switch harness connector terminal No. 5 and PCM harness connector terminal No. 122. Is the wire harness in good condition? If so, go to next step. If not, repair wire harness as necessary.
  47. Check combination meter harness connector and related circuit harness connectors for damage. Are the harness connectors in good condition? If so, repair short to ground in wire harness between PNP switch harness connector terminal No. 5 and combination meter harness connector D-05 terminal No. 8. If not, repair or replace the defective harness connector(s).
  48. Check the PNP switch. See PARK/NEUTRAL POSITION SWITCH  under COMPONENT TESTS. Is the PNP switch operating properly? If so, go to next step. If not, replace PNP switch. See appropriate SERVICING article.
  49. Check PNP switch harness connector for damage. Is the harness connector in good condition? If so, go to next step. If not, repair or replace defective harness connector.
  50. Check the PNP switch output voltage at PCM harness connector by backprobing. Do not disconnect harness connector. Turn ignition on. Move the gearshift lever to "L" position. Measure the voltage between PCM harness connector terminal No. 110 and ground. Battery voltage should exist. Turn ignition off. Is the voltage as specified? If so, go to step  13 . If not, go to next step.
  51. Check all PNP switch circuit harness connectors for damage. Are the harness connectors in good condition? If so, go to next step. If not, repair or replace the defective harness connector(s).
  52. Check wire harness for open or short to ground between PNP switch harness connector terminal No. 6 and PCM harness connector terminal No. 110. Is the wire harness in good condition? If so, go to next step. If not, repair wire harness as necessary.
  53. Check combination meter harness connector and related circuit harness connectors for damage. Are the harness connectors in good condition? If so, repair short to ground in wire harness between PNP switch harness connector terminal No. 6 and combination meter harness connector D-05 terminal No. 9. If not, repair or replace the defective harness connector(s).
  54. Check shift switch assembly harness connector and related circuit harness connectors for damage. Are the harness connectors in good condition? If so, repair short to ground in wire harness between shift switch assembly connector terminal No. 4 and PCM harness connector terminal No. 109. If not, repair or replace the defective harness connector(s).
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