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Test I: Range Selector Display Inoperative Or Displays Incorrect Range (4L80E): Testing

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 GMC Savana Special, 2001 GMC Savana Camper Special, 2001 GMC Savana, 2001 Chevrolet RV Cutaway, and 2001 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC), located below steering column. See Figure . Using scan tool, monitor TR switch parameter while selecting each transmission range with gearshift lever. If scan tool display matches actual gear range selected, go to DIAGNOSTIC AIDS  . If scan tool display does not match actual gear range selected, go to next step.
  2. Monitor IPC gear range display while selecting each transmission range (P, R, N, D4, D3, D2, D1). If each selected transmission range does not match IPC display, go to step  13 . If each selected transmission range matches IPC display, problem may be intermittent. Try to recreate fault by wiggling wiring and connectors. Check for faulty connections at all connectors that may be causing intermittent condition.
  3. Using scan tool, monitor TR switch A/B/C/P display. If TR switch A/B/C/P parameter does not indicate HIGH for all range signal states, go to next step. If TR switch A/B/C/P parameter indicates HIGH for all range signal states, go to step  15 .
  4. Turn ignition switch to OFF position. Disconnect TR switch 4-pin harness connector. Turn ignition switch to RUN position. If scan tool TR switch A/B/C/P parameter does not indicate HIGH for all range signal states, go to next step. If scan tool TR switch A/B/C/P parameter indicates HIGH for all range signal states, go to step  6 .
  5. Disconnect IPC Black 34-pin harness connector. If affected circuit(s) do not indicate HIGH, go to next step. If affected circuit(s) indicate HIGH, go to step  18 .
  6. Individually measure voltage between ground and TR switch harness connector terminals "A" (Black/White wire), "B" (Gray wire), "C" (White wire) and "D" (Yellow wire). If 10-12 volts exists at all terminals, go to next step. If 10-12 volts does not exist at all terminals, go to step  12 .
  7. While monitoring scan tool TR Sw A/B/C/P parameter, connect a fused jumper wire between ground and TR switch harness connector terminal "A" (Black/White wire). If no other signal circuits indicate LOW, go to next step. If any other signal circuits indicate LOW, go to step  14 .
  8. While monitoring scan tool TR Sw A/B/C/P parameter, connect a fused jumper wire between ground and TR switch harness connector terminal "B" (Gray wire). If no other signal circuits indicate LOW, go to next step. If any other signal circuits indicate LOW, go to step  14 .
  9. While monitoring scan tool TR Sw A/B/C/P parameter, connect a fused jumper wire between ground and TR switch harness connector terminal "C" (White wire). If no other signal circuits indicate LOW, go to next step. If any other signal circuits indicate LOW, go to step  14 .
  10. While monitoring scan tool TR Sw A/B/C/P parameter, connect a fused jumper wire between ground and TR switch harness connector terminal "D" (Yellow wire). If no other signal circuits indicate LOW, go to next step. If any other signal circuits indicate LOW, go to step  14 .
  11. Check for short to ground in TR switch signal circuits which did not indicate HIGH. If circuits are okay, go to step  17 . If circuits are not okay, repair as necessary. After repair, go to step  19 .
  12. Check for open in TR switch signal circuits which did not indicate HIGH. If circuits are okay, go to step  17 . If circuits are not okay, repair as necessary. After repair, go to step  19 .
  13. Check for open in Black/White wire, Gray wire, White wire and Yellow wire (TR switch signal circuits) between TR switch and IPC. If circuits are okay, go to step  18 . If circuits are not okay, repair as necessary. After repair, go to step  19 .
  14. Check affected TR switch signal circuits for a shorted together condition. If all circuits are okay, go to step  16 . If any circuits are not okay, repair as necessary. After repair, go to step  19 .
  15. Check for open in Black wire between ground and TR switch harness connector C1 terminal "D". If Black wire is okay, go to next step. If Black wire is not okay, repair as necessary. After repair, go to step  19 .
  16. Replace TR switch (park/neutral position switch). After repair, go to step  19 .
  17. Replace PCM. See PROGRAMMING  . After repair, go to step  19 .
  18. Replace IPC. After repair, go to next step.
  19. Turn ignition switch to RUN position. Using scan tool, monitor TR Sw display while selecting each transmission range (P, R, N, D4, D3, D2 and D1). If each selected transmission range matches scan tool display, system is okay at this time. If each selected transmission range does not match scan tool display, go to step  2 .
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