DTC Advanced Diagnostics: P0706
DTC P0706:Transmission Range Switch Open

General Description

Transmission range switch contact point input matrix:

Shift lever position/mode
Input per switch
ATP-P
ATP-R
ATP-N
ATP-D
ATP-S
ATP-L
ATP-
FWD
ATP-
RVS
P
O
X
X
X
X
X
X
X
R
X
O
X
X
X
X
X
O
N
X
X
O
X
X
X
X
X
D
X
X
X
O
X
X
O
X
S
X
X
X
X
O
X
O
X
L
X
X
X
X
X
O
O
X
O: Closed X: Open

The transmission range switch is attached to a control shaft. Operating the shift lever 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 powertrain control module (PCM) 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, the PCM 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 lever position/mode
D, S, L

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, S, and L position/mode.

[ ]: HDS Parameter

Possible Cause
NOTE: 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 connector loose connection or disconnection)
Transmission range switch failure
Shift cable adjustment failure
PCM internal circuit failure

Confirmation Procedure
Operating Condition

1.
Start the engine.
2.
Accelerate the vehicle in D position/mode to 30 mph (48 km/h) or more.
3.
Slow down to 6 mph (10 km/h) for several seconds.
4.
Stop the vehicle, and turn the vehicle to the OFF (LOCK) mode.
5.
Repeat Driving Pattern steps 1 through 3.
Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
With the HDS
None.

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM 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 or by disconnecting the 12 volt battery.