DTC 1306: Vehicle Speed Pulse

NOTE: 

• Check the vehicle 12 volt battery condition first .
• This navigation DTC sets when there is a problem with the VSP circuit.
• Check for aftermarket accessories that may interfere with the navigation system.
• Check the GPS reception in an open area.
• Aftermarket metallic window tint or electronic devices located near the audio-navigation unit or GPS antenna can potentially interfere with the operation of the navigation system.
• Before you troubleshoot, make sure to follow the General Troubleshooting Information .
• Check any official Honda service website for more service information about the navigation system.
• Check the connectors for poor connections or loose terminals.

• 1. Problem verification:

  1. Clear the hard error codes .

  2. Test-drive the vehicle at steady speed more than 12 mph (20 km/h) for about 1 minute.

  3. Check for hard error codes .

  Is DTC 1306 indicated?

  YES 

  The failure is duplicated, go to step 2.

  NO 

  Intermittent failure, the system is OK at this time.

• 2. Determine possible failure area (audio-navigation unit, others):

  1. Go into the System Diagnostic Mode, and select the Vehicle Status in the Unit Check .

  2. With the help of an assistant test-drive the vehicle, and watch the VSP status.

  Does the VSP change from [0] (stopped) to [1] (driving) as you drive?

  YES 

  Replace the audio-navigation unit .

  NO 

  Go to step 3.

• 3. Determine possible failure area (VSP line, others):

  1. Turn the vehicle to the OFF (LOCK) mode.

  2. Jump the SCS line with the HDS, and wait more than 1 minute.

  3. Disconnect the following connector.

  PCM connector A (51P)

  4. Turn the vehicle to the ON mode.

  5. Measure the voltage between test points 1 and 2.

  Test condition	Vehicle ON mode
  	PCM connector A (51P): disconnected
  Test point 1	PCM connector A (51P) No. 25
  Test point 2	Body ground

  Is there about 5.0 V?

  YES 

  The VSP wire is OK. Go to step 4.

  NO 

  Go to step 5.

• 4. PCM check:

  1. Turn the vehicle to the OFF (LOCK) mode.

  2. Reconnect PCM connector A (51P).

  3. Raise the vehicle on a lift.

  4. Turn the vehicle to the ON mode.

  5. Block the front tire of one side, and rotate the front tire slowly that is not blocked.

  6. Measure the voltage between test points 1 and 2.

  Test condition

  Vehicle ON mode, with the front tire slowly rotating

  Test point 1	Audio-navigation unit connector G (24P) No. 14
  Test point 2	Body ground

  Does the voltage pulse between 0 V and 5 V as you rotate the tire?

  YES 

  Replace the audio-navigation unit .

  NO 

  Substitute a known-good PCM , and recheck.

• 5. Open wire check (VSP line):

  1. Measure the voltage between test points 1 and 2.

  Test condition	Vehicle ON mode
  	PCM connector A (51P): disconnected
  Test point 1	Audio-navigation unit connector G (24P) No. 14
  Test point 2	Body ground

  Is there about 5.0 V?

  YES 

  Repair an open in the wire between the audio-navigation unit and the PCM.

  NO 

  The VSP wire is not open. Go to step 6.

• 6. Shorted wire check (VSP line):

  1. Turn the vehicle to the OFF (LOCK) mode.

  2. Disconnect the following connector.

  Audio-navigation unit connector G (24P)

  3. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode
  	PCM connector A (51P): disconnected
  	Audio-navigation unit connector G (24P): disconnected
  Test point 1	Audio-navigation unit connector G (24P) No. 14
  Test point 2	Body ground

  Is there continuity?

  YES 

  Repair a short to body ground in the wire between the audio-navigation unit and the PCM.

  NO 

  Replace the audio-navigation unit .