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Home >> Isuzu >> 1998 >> Trooper S, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Transfer Case >> Transfer Case Diagnosis - Torque On-Demand >> Fault Diagnosis From Tod Indicator >> Tod Mode Is Displayed With Transfer Lever In 4L Position

Tod Mode Is Displayed With Transfer Lever In 4L Position

  1. Turn ignition on. Backprobe ECU connector and measure voltage between ECU connector terminals No. 9 and 19 with transfer lever in high position. If 5 volts is present, go to next step. If 5 volts is not present, go to step  4 .
  2. Backprobe ECU connector and measure voltage between ECU connector terminals No. 9 and 19 with transfer lever in neutral position. If no voltage is present, go to next step. If voltage is present, go to step  4 .
  3. Backprobe ECU connector and measure voltage between ECU connector terminals No. 9 and 19 with transfer lever in 4L position. If no voltage is present, replace ECU. Go to next step. If voltage is present, go to next step.
  4. Turn ignition off. Disconnect ECU connector. Turn ignition on. Measure voltage between ECU connector terminals No. 9 and 19 with transfer lever in high position. If 12 volts is present, go to next step. If 12 volts is not present, go to step  7 .
  5. Measure voltage between ECU connector terminals No. 9 and 19 with transfer lever in neutral position. If no voltage is present, go to next step. If voltage is present, go to step  7 .
  6. Measure voltage between ECU connector terminals No. 9 and 19 with transfer lever in 4L position. If no voltage is present, go to next step. If voltage is present, repair short in Green/Blue or Brown/Blue wire between ECU and 4L switch. Go to step  13 .
  7. Turn ignition off. Check for continuity between ECU connector terminals No. 9 and 19 with transfer lever in high position. If continuity exists, go to step  10 . If no continuity exists, go to next step.
  8. Check for continuity between ECU connector terminals No. 9 and 19 with transfer lever in neutral position. If continuity exists, go to next step. If no continuity exists, go to step  10 .
  9. Check for continuity between ECU connector terminals No. 9 and 19 with transfer lever in 4L position. If continuity exists, problem is intermittent. See INTERMITTENTS  . Go to step  13 . If no continuity exists, go to next step.
  10. Disconnect 12-pin M27 connector. See WIRING DIAGRAMS  . Check for continuity between M27 connector terminal No. 12 and ground, with transfer lever in neutral position. If continuity exists, repair broken Green/Blue wire between M27 connector and H17 9-pin floor connector. Go to next step. If no continuity exists, repair open in 4L or 4H switch wiring and/or switch ground. Go to step  13 .
  11. Check for continuity between M27 connector terminal No. 12 and ground, with transfer lever in 4L position. If continuity exists, go to next step. If no continuity exists, repair 4L switch wiring or ground circuit. Go to step  13 .
  12. Check for continuity between M27 connector terminal No. 12 and ground, with transfer lever in high position. If no continuity exists, go to next step. If no continuity exists, repair 4H switch wiring or ground circuit. Go to next step.
  13. Ensure all mechanical and electrical components are mounted correctly. If all components are mounted correctly, test is complete. Recheck system operation. If any components are not mounted correctly, repair or replace as needed. Repeat drive test and see if symptom is repeated.
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