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Home >> Oldsmobile >> 1998 >> Regency >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0706 - Transaxle Range System Performance >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. After performing OBD system check, go to next step.
  2. If DTC P0705 is also set, diagnose DTC P0705 before proceeding. If DTC is not set, go to next step.
  3. Turn ignition on. Place gear selector in Park. Using scan tool, read TRANS RANGE display. If scan tool displays P-N, go to next step. If scan tool does not display P-N, go to step 5).
  4. Place gear selector in Neutral. Read scan tool TRANS RANGE display. If scan tool displays P-N, see DIAGNOSTIC AIDS. If scan tool does not display P-N, go to next step.
  5. Read scan tool TR PABC display. If scan tool displays P=O A=O B=O C=O, go to next step. If display is not as specified, go to step 10).
  6. Disconnect TRS 4-pin harness connector. If scan tool displays P=O A=O B=O C=O, go to next step. If display is not as specified, go to step 8).
  7. Turn ignition off. Disconnect PCM harness connector. Check TRS input circuit for being pinched or shorted to ground. Repair as necessary. After repairs, go to step 12). If no problem is found, go to step 11).
  8. Attempt to adjust PNP/TRS switch. Read scan tool TRANS RANGE display with Park and Neutral selected. If scan tool displays P-N, go to step 12). If scan tool does not display P-N, go to next step.
  9. Ensure wires in TRS 4-pin harness connector are not crossed. Repair as necessary. After repairs, go to step 12). If no problem is found, go to next step.
  10. Replace TRS. After replacing switch, go to step 12).
  11. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  12. Clear DTCs. Observe scan tool display while placing gear selector in each gear position. Record TR PABC status for each gear position. Compare scan tool display for each gear position with TRANSAXLE RANGE SWITCH VALID INPUT COMBINATIONS table. If scan tool display matches table entries for each gear selected, repair is complete. If scan tool display does not match table entries, return to step 3).
TRANSAXLE RANGE SWITCH VALID INPUT COMBINATIONS

Gear Selector Position Scan Tool TR PABC Display
Park P=O A=O B=X C=X
Reverse P=X A=O B=O C=X
Neutral P=O A=X B=O C=X
Drive 4 P=X A=X B=O C=O
Drive 3 P=O A=O B=O C=O
Drive 2 P=X A=O B=X C=O
Drive 1 P=O A=X B=X C=O
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