DTC P1721

DTC P1721  : Park Pawl Unit IG1 SW No Signal

DTC (Gear)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode.

   -4. Turn the vehicle to the ON mode, and wait for at least 10 seconds.

   -5. Check for Pending or Confirmed DTCs with the HDS

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P1721 Park Pawl Unit IG1 SW No Signal

   Is DTC P1721 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections and loose terminals between the under-hood fuse/relay box and the park pawl actuator driver unit. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

2. Fuse check

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

   -2. Check the following fuse.

   Fuse

   No. C6

   Is the fuse OK?

   YES 

   The fuse is OK. Reinstall the fuse, then go to step 3.

   NO 

   Replace faulty fuse, and recheck. If the fuse blows again, repair a short to ground in the blown fuse circuit.

3. Open wire check (IG1 P-ACT line)

   -1. Disconnect the following connector.

   Park pawl actuator driver unit 26P connector

   -2. Turn the vehicle to the ON mode.

   -3. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Park pawl actuator driver unit 26P connector: disconnected
   Test point 1	Park pawl actuator driver unit 26P connector No. 15
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   IG1 P-ACT wire is OK, go to step 4.

   NO 

   Repair an open in the IG1 P-ACT wire between the under-hood fuse/relay box and the park pawl actuator driver unit.

4. Park pawl actuator driver unit check

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

   -2. Substitute a known-good park pawl actuator driver unit .

   -3. Reconnect the following connector.

   Park pawl actuator driver unit 26P connector

   -4. Turn the vehicle to the ON mode.

   -5. Update the park pawl actuator driver unit .

   

   Do not turn the vehicle to the OFF (LOCK) mode. Turning the vehicle to the OFF (LOCK) mode during an update can damage the park pawl actuator driver unit.

   -6. Clear the DTC with the HDS.

   -7. Turn the vehicle to the OFF (LOCK) mode.

   -8. Turn the vehicle to the ON mode, and wait for at least 10 seconds.

   -9. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P1721 Park Pawl Unit IG1 SW No Signal

   Is DTC P1721 indicated?

   YES 

   The park pawl actuator driver unit is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM , then recheck. If this DTC goes away and the PCM was substituted, replace the original PCM .

   NO 

   Replace the original park pawl actuator driver unit .