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Home >> Chevrolet >> 2003 >> Corvette Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0706: Transmission Range Switch >> Diagnostic Procedures

Diagnostic Procedures

  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition ON, with engine OFF. Select TR Sw. on the scan tool. With the scan tool, observe the TR Sw. display while selecting each transmission range: P, R, N, D3, D2 and D1. Does each selected transmission range match the scan tool TR Sw. display? If yes, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
  3. Inspect the TR switch which is part of the Park/Neutral Position (PNP) switch assembly for the following:
    • Damage.
    • Loose or missing mounting hardware.
    • Proper adjustment. See PARK/NEUTRAL POSITION SWITCH under ADJUSTMENTS in SERVICING - CORVETTE article in AUTOMATIC TRANSMISSIONS.

    Inspect the shift control cable for the following:

    • Damaged or stretched cable.
    • Proper adjustment. See SHIFT CONTROL CABLE under ADJUSTMENTS in SERVICING - CORVETTE article in AUTOMATIC TRANSMISSIONS.

    Did you find and correct a condition? If yes, go to step  16. If no, go to next step.

  4. With the scan tool, observe the TR Sw. A/B/C/P display. Does the scan tool TR Sw. A/B/C/P parameter indicate HI for all range signal states? If yes, go to step  13. If no, go to next step.
  5. Turn ignition OFF. Disconnect the TR switch 4-way connector. Turn ignition ON, with engine OFF. Does the scan tool TR Sw. A/B/C/P parameter indicate HI for all range signal states? If yes, go to next step. If no, go to step  10.
  6. Using the DVOM and Connector Terminal Test Kit, measure the voltage between the TR switch 4-way connector terminal "A" and ground. Measure the voltage between the TR switch 4-way connector terminal "B" and ground. Measure the voltage between the TR switch 4-way connector terminal "C" and ground. Measure the voltage between the TR switch 4-way connector terminal "D" and ground. Does the voltage measure 10-12 V at all 4 terminals? If yes, go to next step. If no, go to step  11.
  7. Connect a fused jumper wire between the TR switch 4-way connector terminal "D", signal "A" circuit, to ground while monitoring the scan tool TR Sw. A/B/C/P parameter. When the signal "A" circuit (CKT 771) is grounded, do any other signal circuits indicate LOW? If yes, go to step  12. If no, go to next step.
  8. Connect a fused jumper wire from the TR switch 4-way connector terminal "B", signal "B" circuit, to ground while monitoring the scan tool TR Sw. A/B/C/P parameter. When the signal "B" circuit (CKT 772) is grounded, do any other signal circuits indicate LOW? If yes, go to step  12. If no, go to next step.
  9. Connect a fused jumper wire between the TR switch 4-way connector terminal "C", signal "C" circuit, to ground while monitoring the scan tool TR Sw. A/B/C/P parameter. When the signal "C" circuit (CKT 773) is grounded, do any other signal circuits indicate LOW? If yes, go to step  12. If no, go to step  14.
  10. Test the signal circuit or circuits (CKTs 771, 772, 773 and 776) of the TR switch that did not indicate HI for a short to ground. Did you find and correct the condition? If yes, go to step  16. If no, go to step  15.
  11. Test the signal circuit or circuits (CKTs 771, 772, 773 and 776) of the TR switch that did not indicate proper voltage for an open. Did you find and correct the condition? If yes, go to step  16. If no, go to step  15.
  12. Test the affected signal circuits of the TR switch for a shorted together condition. Did you find and correct the condition? If yes, go to step  16. If no, go to step  15.
  13. Test the ground circuit (CKT 450) of the TR switch for an open. Did you find and correct the condition? If yes, go to step  16. If no, go to next step.
  14. Replace the TR switch, this switch is part of the PNP switch. SeePARK/NEUTRAL POSITION SWITCH under REMOVAL & INSTALLATION in SERVICING - CORVETTE article in AUTOMATIC TRANSMISSIONS. Did you complete the replacement? If yes, go to step  16.
  15. Replace PCM. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION - CORVETTE article. Did you complete the replacement? If yes, go to next step.
  16. Perform the following procedures in order to verify the repair:
    • Select DTC.
    • Select Clear Info.
    • Drive the vehicle greater than 5 MPH for a short distance, then stop the vehicle.
    • Select each transmission range: P, R, N, D3, D2 and D1.
    • Place the transmission in Park.
    • Select Specific DTC.
    • Enter DTC P0706.

    Has the test run and passed? If yes, go to next step. If no, go to step  2.

  17. With the scan tool, observe the stored information, capture info, and DTC Info. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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