| Table 1: | Transmission Range Switch Valid Input Combinations |
| Table 2: | DTC P0706 - Transmission Range Switch Performance |
Circuit Description
The Transmission Range Switch is part of the Transmission Park/Neutral Position (PNP) switch mounted on the transmission manual shaft. The four inputs from the transmission range switch indicate to the PCM which position is selected by the Transmission selector lever. This information is used for ignition timing, EVAP canister purge, EGR and IAC valve operation. The combination of the four transmission range input states determine the PCM commanded shift pattern. The input voltage level at the PCM is high (B+) when the transmission 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 High=high voltage level, Low=low voltage level. The four parameters represent transmission range switch Parity, A, B, and C inputs respectively.
A problem with the transmission 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) | Low | Low | High | High |
Reverse (R) | High | Low | Low | High |
Neutral (N) | Low | High | Low | High |
Drive4 (OD) | High | High | Low | Low |
Drive3 (3) | Low | Low | Low | Low |
Drive2 (2) | High | Low | High | Low |
Drive 1 (1) | Low | High | High | Low |
Conditions for Running the DTC
The system voltage (Ignition 1) is greater than 9 volts.
Conditions for Setting the DTC
| • | The Transmission Range Switch inputs indicate a gear position other than Park or Neutral during startup. |
| • | The above conditions are present for 2 consecutive startups. |
Action Taken When the DTC Sets
| • | The PCM defaults to a D4 transaxle range display. |
| • | The PCM will not illuminate the Malfunction Indicator Lamp (MIL). |
| • | The PCM will store conditions which were present when the DTC set as Fail Records data only. This information will not be stored as Freeze Frame data. |
Conditions for Clearing the MIL/DTC
| • | A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | DTC can be cleared by using the scan tool Clear Information function or by disconnecting the PCM battery feed. |
Diagnostic Aids
DTC P0706 set indicates a misadjusted Park Neutral Position / Transmission Range Switch.
Important: Vehicle should not be driven with transaxle range switch disconnected, as idle quality will be affected.
Review the Fail Records vehicle mileage since the diagnostic test last failed. This may help determine how often the condition that caused the DTC to be set occurs.
Test Description
Number(s) below refer to the step number(s) on the Diagnostic Table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (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 Switch P / A / B / C display. Does scan tool TR Switch P / A / B / C display the specified values? | P=Low A=Low B=Low C=Low | ||
6 |
Does scan tool TR Switch P / A / B / C display the specified values? | P=Low A=Low B=Low C=Low | ||
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 Transmission Range switch. Refer to 4L60-E Transmission On-Vehicle Service . Is action complete? | -- | -- | |
Replace the PCM. Important:: The replacement PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming . Is action complete? | -- | -- | ||
12 |
Does the scan tool display match the Transmission Range Switch Valid Combinations table in each gear position? | -- | System OK |
