DTC P15AB

DTC P15AB  : Engine Mount Control Unit Power Source Circuit Low Voltage

NOTE: 

• Before you troubleshoot, review the general troubleshooting information .
• If DTC P16C5 is stored at the same time as DTC P15AB, troubleshoot DTC P16C5 first, then recheck for DTC P15AB.

DTC (Engine Mount Control Unit)

1. Problem verification

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Start the engine, and let it idle 10 seconds.

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

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P15AB Engine Mount Control Unit Power Source Circuit Low Voltage

   Is DTC P15AB indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the engine mount control unit, the front engine mount actuator, the rear engine mount actuator, and ground G301. 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. Shorted wire check (IG1 ECU AS line)

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

   - 2. Check the following fuse.

   Fuse	No. E20 (7.5 A)
   Location	Passenger's under-dash fuse/relay box

   Is the fuse OK?

   YES 

   Go to step 3.

   NO 

   Repair a short in the IG1 ECU AS wire between the No. E20 (7.5 A) fuse and the engine mount control unit. Also replace the No. E20 (7.5 A) fuse.

3. Connection check

   - 1. Check for poor connections or loose terminals at the engine mount control unit 16P connector.

   Are the connections and the terminals OK?

   YES 

   Go to step 4.

   NO 

   Repair the connections or the terminals.

4. Open wire check (IG1 ECU AS line)

   - 1. Disconnect the following connector.

   Engine mount control unit 16P connector

   - 2. Turn the vehicle to the ON mode.

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

   Test condition	Vehicle ON mode
   	Engine mount control unit 16P connector: disconnected
   Test circuit	IG1 ECU AS
   Test point 1	Engine mount control unit 16P connector No. 9 (LT GRN)
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   Go to step 5.

   NO 

   Repair an open in the IG1 ECU AS wire between the No. E20 (7.5 A) fuse and the engine mount control unit.

5. Open wire check (PGND line)

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

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

   Test condition	Vehicle OFF (LOCK) mode
   	Engine mount control unit 16P connector: disconnected
   Test circuit	PGND
   Test point 1	Engine mount control unit 16P connector No. 4 (BLK)
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Replace the engine mount control unit .

   NO 

   Repair an open in the PGND wire between the engine mount control unit and ground G301.