Refer to
Cell 20: Automatic Tranaxle Range Switch, and IAC
Circuit Description
The Transaxle Range Switch is part of the Transaxle Park/Neutral Position (PNP) switch mounted on the transaxle manual shaft. The four inputs from the transaxle range switch indicate to the PCM which position is selected by the Transaxle selector lever. This information is used for ignition timing, EVAP canister purge, EGR and IAC valve operation. The combination of the four transaxle range input states determine the PCM commanded shift pattern. The input voltage level at the PCM is high (B+) when the transaxle range switch is open and low when the switch is closed to ground. The state of each input is represented on the scan tool as X=high voltage level, 0=low voltage level. The four parameters represent transaxle range switch Parity, A, B, and C inputs respectively.
A problem with the transaxle range switch adjustment which causes the PCM to detect vehicle startup while a gear position other than Park or Neutral is selected will set DTC P0706.
Gear Selector Position | Scan Tool Trans Range PABC Display X=High 0=Low | |||
|---|---|---|---|---|
P | A | B | C | |
Park (P) | 0 | 0 | X | X |
Reverse (R) | X | 0 | 0 | X |
Neutral (N) | 0 | X | 0 | X |
Drive4 (OD) | X | X | 0 | 0 |
Drive3 (3) | 0 | 0 | 0 | 0 |
Drive2 (2) | X | 0 | X | 0 |
Drive 1 (1) | 0 | X | X | 0 |
Conditions for Setting the DTC
| • | The system voltage (Ignition 1) is greater than 9 volts. |
| • | The Transaxle Range Switch inputs indicate a gear position other than Park or Neutral during startup. |
| • | The above conditions are present for 3 consecutive startups. |
Action Taken When the DTC Sets
The PCM stores conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.
Conditions for Clearing the MIL/DTC
| • | The DTC becomes history when the conditions for setting the DTC are no longer present. |
| • | The history DTC clears after 40 malfunction free warm-up cycles. |
| • | The PCM receives a clear code command from the scan tool. |
Diagnostic Aids
Important:: Vehicle should not be driven with transaxle range switch disconnected, as idle quality will be affected.
DTC P0706 set indicates a misadjusted Park Neutral Position / Transaxle Range Switch.
Important: : Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.
| • | Poor terminal connection. |
| Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Use a corresponding mating terminal to test for proper tension. Refer to Intermittents and Poor Connections Diagnosis , and Connector Repairs Wiring Systems. |
| • | Damaged harness. |
| Inspect the wiring harness for damage. If the harness appears to be OK, observe the sensor display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the sensor display may indicate the location of the fault. Refer to Wiring Repairs in Wiring Systems. |
| • | Inspect the PCM and the engine grounds for clean and secure connections. |
If the DTC is determined to be intermittent, reviewing the Fail Records can be useful in determining when the DTC was last set.
Test Description
The numbers below refer to the step numbers on the Diagnostic Table.
Procedures in Powertrain Control Module (PCM) and Sensors.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Powertrain OBD System Check performed? | -- | ||
2 | Is DTC P0705 also set? | -- | ||
3 |
Does Trans Range display indicate P-N? | -- | ||
4 |
Does Trans Range display indicate P-N? | -- | Go to Diagnostic Aids | |
5 | Observe the scan tool TR P A B C display. Does scan tool TR P A B C display the specified values? | P=0 A=0 B=0 C=0 | ||
6 |
Does scan tool TR P A B C display the specified values? | P=0 A=0 B=0 C=0 | ||
7 |
Was a problem found? | -- | ||
8 |
Does the scan tool display P-N with Park and Neutral selected? | -- | ||
9 |
Was a problem found? | -- | ||
10 | Replace the Transaxle Range switch. Refer to Park/Neutral Position Switch Replacement in Automatic Transaxle. Is the action complete? | -- | -- | |
|
Important: : The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Is the action complete? | -- | -- | ||
12 |
Does the scan tool display match the Transaxle Range Switch Valid Input Combinations table in each gear position? | -- | System OK |
