DTC P0705 - TRANSAXLE RANGE SWITCH CIRCUIT Oldsmobile Cutlass VI

Note. For circuit reference, see the appropriate WIRING DIAGRAMS article. For connector and terminal identification, see CONNECTOR IDENTIFICATION .

Circuit Description

Transaxle range switch is a multi-signal switch that sends a signal indicating gear selection to Powertrain Control Module (PCM). Transaxle range switch uses 4 circuits to pull PCM voltage low in various combinations to indicate each gear range. Voltage level of circuits is represented as "X (high voltage) or "O" (low voltage).

Conditions for setting this DTC are as follows

1. PCM recognizes an invalid PRNDL parameter.
2. Vehicle speed is more than 5 MPH.

Scheme 20

1. Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the «BASIC TESTING - 3.1L»(ref-20651) article. After performing OBD system check, go to next step.
2. Turn ignition on, with engine off. Place transaxle gear selector in Park. Using scan tool, observe TRANS RANGE PABC display. Compare scan tool values with transaxle range switch valid input combination values. See TRANSAXLE RANGE SWITCH VALID INPUT COMBINATION VALUES table. (Scheme 20) In Park, if all values are as specified, go to next step. If any value is not as specified, go to step 4). (Scheme 20): Transaxle Range Switch Valid Input Combination Values
3. Observe TRANS RANGE PABC display and move gear selector through all gear selections. Compare scan tool values with transaxle range switch valid input combination values. If all values are as specified, see DIAGNOSTIC AIDS. If any value is not as specified, go to step 10).
4. If all TRANS RANGE PABC values are indicated as "X" (high voltage), go to next step. If all values are not indicated as "X", go to step 7).
5. Check if transaxle range switch is disconnected. Repair as necessary. After repairs, go to step 17). If switch is not disconnected, go to next step.
6. Check transaxle range switch ground circuit for an open or poor connection. Repair as necessary. After repairs, go to step 17). If circuit is okay, go to step 13).
7. If all TRANS RANGE PABC values are indicated as "O" (low voltage), go to next step. If all values are not indicated as "O", go to step 10).
8. Disconnect transaxle range switch connector. Observe TRANS RANGE PABC display. If all TRANS RANGE PABC values are indicated as "O" (low voltage), go to next step. If all values are not indicated as "O", go to step 14).
9. Turn ignition off. Disconnect PCM connector. Check transaxle range switch wiring for pinched wires or short to ground. Repair as necessary. After repairs, go to step 17). If wiring is okay, go to step 16).
10. Check for crossed wires in transaxle range switch connector. Repair as necessary. After repairs, go to step 17). If connector is wired properly, go to next step.
11. Turn ignition off. Disconnect transaxle range switch and PCM connectors. Turn ignition on. Check for an open, short to ground or short to voltage in circuit that caused incorrect value reading in step 3). Repair as necessary. After repairs, go to step 17). If no problem is found, go to next step.
12. Reconnect transaxle range switch connector. Connect a test light between positive battery terminal and circuit terminal that caused incorrect value reading in step 3). Observe and note state of test light while moving gear selector through all gears. Compare test light state in each gear selection with transaxle range switch valid input combination values. If test light is on when value should be "O" and off when value should be "X", go to step 15). If test light is not as specified, go to next step.
13. Check for poor terminal connections at transaxle range switch connectors. Repair as necessary. After repairs, go to step 17). If terminal connections are okay, go to next step.
14. Replace defective transaxle range switch. After repairs, go to step 17).
15. Disconnect and inspect PCM connector for damaged pins, corrosion and loose wires. After repairs, go to step 17). If terminal connections are okay, go to next step.
16. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
17. Observe TRANS RANGE PABC display and move gear selector through all gear selections. Compare scan tool values with transaxle range switch valid input combination values. If all values are as specified, repair is complete. If any value is not as specified, repeat step 2).

Diagnostic Aids

Disconnect and inspect PCM connector. Inspect for damaged pins, corrosion and loose wires. An intermittent problem can be caused by a poor connection, rubbed-through wire insulation or broken wire inside insulation. Reviewing FAIL RECORDS vehicle mileage since diagnostic test last failed may help determine how often condition that caused DTC to be set occurs.