DTC P0706: Transmission Range Switch (Open)

NOTE:

Before you troubleshoot, record all freeze data and any on-board snapshot, and review General Troubleshooting Information (see GENERAL TROUBLESHOOTING INFORMATION ).
This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.

Clear the DTC with the HDS.
Raise the vehicle on a lift, make sure it is securely supported, and allow all four wheels to rotate freely.
Start the engine, and disable the VSA by pressing the VSA OFF switch. Run the engine in D until the vehicle speed reaches 25 mph (40 km/h). Slow down, and stop the wheels.
Verify the Forward Switch (ATP FWD) input with the HDS in the A/T data list while the shift lever is in D and S.
Is Forward Switch (ATP FWD) ON in both D and S?

YES -Intermittent failure, the system is OK at this time.

NO -Go to step 5.
Turn the ignition switch to LOCK (0).
Disconnect the transmission range switch connector.
Connect the transmission range switch connector terminal No. 5 to body ground with a jumper wire. Turn the ignition switch to ON (II), and verify the Forward Switch (ATP FWD) input in the A/T data list.

Fig 1: Connecting Transmission Range Switch Connector Terminal No. 5 To Body Ground With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is Forward Switch (ATP FWD) ON?

YES -Go to step 8.

NO -Repair open in the wire between PCM connector terminal C19 and the transmission range switch, then go to step 15.
Turn the ignition switch to LOCK (0).
Check for continuity between transmission range switch connector terminal No. 6 and body ground.

Fig 2: Checking For Continuity Between Transmission Range Switch Connector Terminal No. 6 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 10.

NO -Repair open in the wire between the transmission range switch and ground (G101, G102), or repair poor ground (G101, G102), then go to step 15.
Inspect the transmission range switch (see TRANSMISSION RANGE SWITCH TEST ).
Is the switch OK?

YES -Connect the transmission range switch connector, then go to step 11.

NO -Replace the transmission range switch (see TRANSMISSION RANGE SWITCH REPLACEMENT ), then go to step 15.
Update the A/T software in the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
Run the engine in D until the vehicle speed reaches 30 mph (48 km/h). Slow down, and stop the wheels.
Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0706 indicated?

YES -Check for poor connections and loose terminals at the transmission range switch and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the PCM was substituted, go to step 1.

NO -Go to step 14.
Monitor the OBD STATUS for P0706 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the HDS indicate PASSED?

YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). If any other DTCs were indicated on step 13, go to the indicated DTC's troubleshooting.

NO -Check for poor connections and loose terminals at the transmission range switch and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, return to step 12and recheck.
Clear the DTC with the HDS.
Run the engine in D until the vehicle speed reaches 30 mph (48 km/h). Slow down, and stop the wheels.
Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0706 indicated?

YES -Check for poor connections and loose terminals at the transmission range switch and the PCM, then go to step 1.

NO -Go to step 18.
Monitor the OBD STATUS for P0706 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the HDS indicate PASSED?

YES -Troubleshooting is complete. If any other DTCs were indicated on step 17, go to the indicated DTC's troubleshooting.

NO -Check for poor connections and loose terminals at the transmission range switch and the PCM, then go to step 1. If the HDS indicates NOT COMPLETED, return to step 16 and recheck.