DTC Advanced Diagnostics: P0706
DTC P0706 : Transmission Range Switch Circuit Open
General Description
Transmission range switch contact point input matrix:
| Shift position/mode | Input per switch | ||||||
|---|---|---|---|---|---|---|---|
| ATP-P | ATP-R | ATP-RVS | ATP-N | ATP-D | ATP-S | ATP-FWD | |
| P | O | X | X | X | X | X | X |
| R | X | O | O | X | X | X | X |
| N | X | X | X | O | X | X | X |
| D | X | X | X | X | O | X | O |
| S | X | X | X | X | X | O | O |
O: Closed X: Open
The transmission range switch is attached to a control shaft. Shifting the transmission to each position/mode makes the control shaft rotate via the shift cable. The shift position indicator shows which position is selected according to the Low/High signal combinations, which vary based on the control shaft rotational angle. The control shaft changes the position of the transmission range switch, activates the manual valve, and switches hydraulic pressure to shift the transmission through forward/neutral/reverse. The transmission range switch signal is used to determine the shift schedule. The voltage is high (5 V or 12 V) at the transmission control module (TCM) input terminal when each transmission range switch position is open, and it is low (0 V) when each switch is closed. If the FWD switch stays open while the vehicle repeatedly accelerates to a specified vehicle speed and then stops despite being in D or S position/mode, the TCM detects a malfunction in the transmission range switch (open) and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | Depending on the driving conditions |
| DTC Type | Two drive cycles, MIL on, Shift position indicator off |
Enable Conditions
| Condition | |
|---|---|
| Shift position/mode | D, S |
Malfunction Threshold
No FWD position signal [Forward Switch] is detected when the vehicle speed [Vehicle Speed] changes from 6 mph (10 km/h) -> 25 mph (40 km/h) -> 6 mph (10 km/h) in D or S position/mode.
[ ]: HDS Parameter
Possible Cause
The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- Transmission range switch ATP-FWD line open (includes a loose or disconnected connector)
- Transmission range switch PG1 line open (includes a loose or disconnected connector)
- Transmission range switch failure
- Shift cable adjustment failure
- TCM internal circuit failure
Confirmation Procedure
Operating Condition
- Start the engine.
- Accelerate the vehicle in D position/mode to 30 mph (48 km/h) or more.
- Slow down to 6 mph (10 km/h) for several seconds.
- Stop the vehicle, and turn the vehicle to the OFF (LOCK) mode.
- Repeat Driving Pattern steps 1 through 3.
- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the TCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored. The shift position indicator does not blink.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool clear command.