DTC P2603

DTC P2603  : Electric Engine Coolant Pump Circuit High Voltage

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Enter the maintenance mode, then start the engine .

   -4. Select the Electric Water Pump TEST in the Function Test Menu with the HDS.

   Electric Water Pump TEST

   Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC
   P2603 Electric Engine Coolant Pump Circuit High Voltage

   Is DTC P2603 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the electric engine coolant pump and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot .

2. Open wire check (EWP_C(SWP) line)

   -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 connectors.

   Electric engine coolant pump 5P connector

   PCM connector E (80P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Electric engine coolant pump 5P connector: disconnected
   	PCM connector E (80P): disconnected
   Test point 1	Electric water pump 5P connector (female terminals) No. 4:
   Test point 2	PCM connector E (80P) No. 29

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

   Is there 1.0 Ω or less?

   YES 

   Go to step 3.

   NO 

   Repair an open in the EWP_C(SWP) wire between the PCM (E29) and the electric engine coolant pump.

3. Electric engine coolant pump check

   -1. Substitute a known-good electric engine coolant pump .

   -2. Reconnect all connectors.

   -3. Exit the SCS mode with the HDS.

   -4. Turn the vehicle to the ON mode.

   -5. Clear the DTC with the HDS.

   -6. Enter the maintenance mode, then start the engine .

   -7. Select the Electric Water Pump TEST in the Function Test Menu with the HDS.

   Electric Water Pump TEST

   Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC
   P2603 Electric Engine Coolant Pump Circuit High Voltage

   Is DTC P2603 indicated?

   YES 

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .

   NO 

   Replace the original electric engine coolant pump .