DTC 1306

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.

   -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. 26
   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 C (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 

   Update the PCM if it does not have the latest software, or 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 C (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 C (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 C (24P): disconnected
   Test point 1	Audio-navigation unit connector C (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 .