DTC P0706

DTC P0706:  Transmission Range Switch Open

General Description 

Without paddle shifter 

Courtesy of HONDA, U.S.A., INC.

With paddle shifter 

Courtesy of HONDA, U.S.A., INC.

Transmission range switch contact point input matrix 

Without paddle shifter 

Shift lever position	Input per switch
	ATP P	ATP-R	ATP RVS	ATP N	ATP D	ATP S	ATP L	ATP FWD
P	O	X	X	X	X	X	X	X
R	X	O	O	X	X	X	X	X
N	X	X	X	O	X	X	X	X

Shift lever position	Input per switch
	ATP P	ATP-R	ATP RVS	ATP N	ATP D	ATP S	ATP L	ATP FWD
D	X	X	X	X	O	X	X	O
S	X	X	X	X	X	O	X	O
L	X	X	X	X	X	X	O	O

With paddle shifter 

Shift lever position	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. Operating the shift lever makes the control shaft rotate via the shift cable. The A/T gear 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, OBD Status 

Execution	Continuous
Sequence	None
Duration	Depending on the driving conditions
DTC Type	Two drive cycles, MIL on, A/T gear position indicator off
OBD Status	PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions 

Condition
Shift lever position	D, S
No active DTCs set (prevents monitor from running)	P0501, P0502, P0705

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.

[ ]: 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 

Courtesy of HONDA, U.S.A., INC.

• Start the engine.
• Accelerate the vehicle in D 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.

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.

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.