DTC P1D9A (229)

DTC P1D9A  : PCU Electric Coolant Pump Circuit

NOTE: 

• Before you troubleshoot, review the general troubleshooting information .
• At a cold district, low concentration coolant can cause this DTC.
• After troubleshooting, do the PCU coolant air bleeding procedure .

DTC (Electric Powertrain)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Check the coolant level and the coolant concentration .

   -4. Select the ELECTRIC WATER PUMP TEST in the Electric Powertrain FUNCTION TEST with the HDS. Then do the START.

   Electric Water Pump Test

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

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P1D9A PCU Electric Coolant Pump Circuit

   Is DTC P1D9A indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Go to step 3.

2. Shorted wire check (PCU_W/P_EWP/EWP line)

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

   -2. Do the 12 volt battery terminal disconnection procedure .

   -3. Disconnect the following connectors.

   PCU electric coolant pump 4P connector

   PCU 33P connector

   -4. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	PCU electric coolant pump 4P connector: disconnected
   	PCU 33P connector: disconnected
   Test point 1	PCU electric coolant pump 4P connector (female terminals) No. 3:
   Test point 2	Body ground

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

   Is there 1 MΩ or more?

   YES 

   Replace the PCU electric coolant pump , then recheck. If DTC P1D9A is still indicated, replace the PCU .

   NO 

   Repair a short in the PCU_W/P_EWP/EWP wire between the PCU electric coolant pump and the PCU.

3. Cooling system check

   -1. Do the PCU coolant circuit inspection .

   Is it OK?

   YES 

   Go to step 4.

   NO 

   Repair or replace parts as needed.

4. PCU electric coolant pump operation check

   -1. Do the PCU coolant air bleeding procedure .

   -2. Turn the vehicle to the ON mode.

   -3. Select the ELECTRIC WATER PUMP TEST in the Electric Powertrain FUNCTION TEST with the HDS. Then do the START.

   Electric Water Pump Test

   -4. Check the parameter(s) below with the HDS.

   Signal	Threshold		Current conditions
   	Value	Unit	Value	Unit
   PCU Electric Coolant Pump Speed (TRC)	1171 - 2894	RPM

   Do the current condition(s) match the threshold?

   YES 

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

   NO 

   Replace the PCU electric coolant pump , then recheck. If DTC P1D9A is still indicated, replace the PCU .